DNTUSER

DNT 0.01 Dynamic NanoTEM concept document

User’s Manual

Prepared by Terence Leach

contract programmer for

Zonge Engineering 3322 E. Ft. Lowell Tucson AZ 85716

January 8, 2008

DNT 0.01......................................................................................................................................... 1

INTRODUCTION......................................................................................................................... 1

INSTALLING DNT....................................................................................................................... 2

QUICK START ............................................................................................................................. 3

YOUR TCP/IP LINK TO THE GDP............................................................................................. 3

START THE DNT SOFTWARE ....................................................................................................... 4

CONFIGURE THE DNT ACQUISITION ............................................................................................ 6

STARTING THE ACQUISITION ........................................................................................................ 9

DETAILED USE OF THE DNT SOFTWARE ........................................................................ 13

AN OVERVIEW OF THE ACQUISITION PROCESS .................................................................... 13

THE MAIN DNT SCREEN.......................................................................................................... 14

LINKING TO ACQUISITION AND GPS HARDWARE........................................................................... 14

CHECKING STATUS......................................................................................................................... 14

HIGH LEVEL CONTROL OF THE ACQUISITION ................................................................................. 16

HOW TO INTERPRET THE SURVEY GRID DISPLAY.......................................................................... 18

CONTROLLING REAL TIME CHANNEL DISPLAY............................................................................... 22

Determining which channels are available for monitoring ........................................................... 22

Setting the type of real time display.............................................................................................. 23

USING THE SET UP SCREEN ..................................................................................................... 25

USING CONFIGURATION FILES....................................................................................................... 25

SURVEY PARAMETERS................................................................................................................... 26

Recording Operator and Job names .............................................................................................. 26

Selecting storage target for acquired data blocks.......................................................................... 26

Recording the Survey line ............................................................................................................. 27

CHANNEL PARAMETERS ................................................................................................................ 28

Determining which channels are physically present in the GDP.................................................. 28

Setting the channel component ..................................................................................................... 28

Setting gain behaviour for all channels ......................................................................................... 29

Using the gain stage displays ........................................................................................................ 29

Seeing channel values in real time ................................................................................................ 30

TRANSMITTER PARAMETERS ......................................................................................................... 31

Setting the transmitter ID .............................................................................................................. 31

Setting the shunt resistor ............................................................................................................... 32

Selecting manual or automatic current control ............................................................................. 33

Recording transmitter antenna parameters.................................................................................... 33

RECEIVER PARAMETERS................................................................................................................ 34

Setting the receiver antenna ID and how it is used ....................................................................... 34

DECAY PARAMETERS..................................................................................................................... 35

Selecting time depth for windowing ............................................................................................. 35

Setting the monitor windows for real time profiling..................................................................... 36

Customizing the decay windows................................................................................................... 36

Recording delay times ................................................................................................................... 37

ARCHIVING DATA......................................................................................................................... 38

SYSTEM ERRORS ..................................................................................................................... 39

ABORT ......................................................................................................................................... 39

STOP ............................................................................................................................................. 39

CONTINUE................................................................................................................................... 39

INFORMATION ........................................................................................................................... 39

Zonge Engineering 23 January, 2008

1 DNT User’s Manual

INTRODUCTION

This manual covers the use of Zonge Engineering’s DNT (Dynamic NanoTem)

software. This software has a PDA component and a GDP (Zonge’s Geophysical

Data Processor) component. The PDA component is designed to run on a GPS

vendor PDA under Windows Mobile. PDA DNT software controls Zonge’s GDP

acquisition hardware via an active TCP/IP link with the GDP. Decay acquisitions

coordinated with transmitter turn off, are passed from the GDP to the PDA in real

time. The DNT software stores all incoming decays on the PDA flash card. GPS

information, if available is merged in real time resulting in a “mow the lawn”

graphical display. GPS vendor specific files are also stored on the PDA’s flash card

for latter post processing operations.

Configuration, control, and monitoring of the GDP acquisition hardware is performed

by the PDA based DNT software over an active TCP/IP link. The GDP must be

running a local ZAP (Zonge Application Protocol) compliant version of DNT

software. Older versions of DNT software (prior to version 900) will not work with

PDA DNT.

If you are interested in collecting data as quickly as possible, read the DNT

installation manual section followed by the Quick start manual section.



INSTALLING DNT

The DNT PDA software may be installed by laptop download.

After connecting your PDA to your LapTop, activate the Setup.EXE program from

your source of choice (a CD, or net download to your LapTop harddrive) and follow

the indicated dialog prompts. If you have a prior version of the DNT software on

your machine, the first operation of the Setup.EXE program will be to un-install your

prior version. You will have to run Setup.EXE a second time to install the

updated version.

After you have successfully installed the PDA DNT software, read the Quick Start

section of this manual.



QUICK START

This manual section will assist you in gathering data as quickly as possible. While

your softwares come pre-installed from Zonge, refer to the “Installing DNT” manual

section if you need to verify installation or are upgrading software.

Power up the GDP, PDA, and GPS equipment.

YOUR TCP/IP LINK TO THE GDP

Connect your PDA to the GDP via a blue network crossover cable. If you have

never connected the GDP before, you may have to adjust your network settings on

your PDA. Disable automatic IP addressing, and enter a manual IP address of

192.168.001.003. If this makes no sense to you, contact Zonge technical support,

or obtain help from your local computer support group.



START THE DNT SOFTWARE

Start the PDA DNT software by selecting the DNT icon on your PDA’s desk top.

You should see the main screen of the PDA DNT software.



In the upper left corner you should see the “NO GDP” indicator light change from red

to green, indicating an active TCP/IP link with the GDP. If this does not occur within

2 minutes, contact technical support. The GDP should also report current battery

voltage and cache block #.

Within the same time period, you should see the GPS LINKED indicator light

change from red to yellow indicating active communication with GPS hardware.

Once enough satellites have been acquired to provide accurate position information,

the indicator light will change to green.

Look to the lower right corner, and check that GDP and transmitter battery levels are

good, and that GDP internal hardware has passed self-check. All status lights

except for the “sync” light should be green.

At this point all your supporting hardware is active, and the system is ready to

perform acquisitions. The next section details a minimum setup required for

acquisition.



CONFIGURE THE DNT ACQUISITION

Use the DNT Setup screen to set “static” parameters for your DNT acquisition. To

access the screen, hit the “SetUp” button located in the lower right of the PDA DNT

main screen.

In the spirit of “quick start”, we will review the minimum setup necessary to get your

acquisition up and running. Parameters are grouped by topic on the Set Up screen,

so we’ll follow this natural organization.



In the “Survey” parameters section, make sure that you will be storing data to the

PDA. This is done by “clicking” on the PDA light to turn it green. If it is already

green, nothing need be done.

In the “Channels” parameters section, make sure that at least 1 channel is on. A

channel is “on” if it’s component is set to some other value besides “Off”.

This is done by right clicking the “component” parameter for your channel of interest.

A pop-up selection will appear, simply select the component whose geometry

matches your receiver antenna. Receiver antenna’s which are horizontal to the

ground are labeled “Z”.

In addition make sure the gain control setting, for all channels, is at “Auto”.



Select your transmitter ID. The Transmitter ID selects transmitter settings from a

look up file, including a default shunt resistor. Make sure the TX current is set to

“Max”. This tells the transmitter to maximize current output during your survey. The

GDP self-check operation will default the transmitter setting for you.

In order to prevent “ringing” in the transmitter/receiver antenna system, an

appropriate shunt resistor is needed. The system will select a shunt resistor for you

when you select the transmitter ID. If you are familiar with testing system response,

you may override the shunt resistor to meet any custom requirements.

Use the “Done” button located on the lower right of the setup screen to complete

this quick start SetUp.



STARTING THE ACQUISITION

Having returned to the main DNT screen, You must set your operation frequency, a

cycle count, and make sure your channel(s) is(are) active. The operation frequency

is located at the upper center of the main DNT screen. A 270hz/5 cycle combination

is a good choice which allows cancellation of 1st and 3

rd harmonics of 60hz noise.



Changes made within the SetUp screen regarding channels will appear on the main

screen. You can use the lower section of the screen to monitor channels of your

choice in real time.

Channels not physically present in the GDP card cage, as well as those you have

turned off in the setup screen, will be disabled. For all physically present channels

which are on, you can select one or more channels to be graphed in real time. In

the display above, channel 1 has been selected for real time monitoring, which

channels 2 and 3 are either not present or have been turned off in the SetUp

screen. Note that your selection of monitor channels has no impact on GDP

performance.



To start your acquisition, press the acquisition control button located at the upper

center of the screen.

You acquisition will begin. You should see the GDP block number increment at

each new data block is gathered by the GDP. You survey grid will show a colored



rectangle for each acquired data block. In the absence of grid sizing information

(the Grid Setup screen), 10 pixels per meter will be used to size the displayed

rectangle based on the TX X, and TX Y parameter values on the SetUp screen. As

you move the DNT cart, you should see the displayed rectangle displays follow the

cart.

You should also see a real time graph for channels you have chosen to display in

real time.



DETAILED USE OF THE DNT SOFTWARE

This manual section covers detailed use of all the controls on the various screens of

the DNT software.

AN OVERVIEW OF THE ACQUISITION PROCESS

Zonge’s DNT system measures decays associated with a volume of earth and

associated items embedded in that volume. The volume of earth is energized by

the transmitter antenna transition from an “on” to an “off” state. This energization

excites not only the volume of earth, but the transmitter/receiver antenna system as

well. Any measurement a certain time following transmitter antenna turn off, is a mix

of three main contributors. First the response of the system itself, next the response

of the earth volume and any embedded items, and finally any coherent noise such

as 60 cycle harmonics or cart vibration. As we are only interested in the response of

items embedded in the energized earth volume, it’s desirable to minimize the other

contributors to the measured value.

The delay parameters are used to mitigate the contribution of system response to

the measured values in the early times of the decay.

The choice of operation frequency in combination with a cycle count is used to

diminish contributions from ambient 60hz and harmonics. To maximize the use of

these parameters, an ambient measurement of 60hz and it’s main harmonics should

be made at the survey site.

Size and composition of objects embedded in the energized earth volume affect the

duration and magnitude of measured decays. Use of the windowing parameters as

well as the channel sample rate parameter control the length of time for which a

decay is measured.



THE MAIN DNT SCREEN

The Main DNT screen is used to control and monitor GDP acquisitions in

conjunction with GPS positioning.

Linking to acquisition and GPS hardware

When first booted, the DNT software will try to establish communication with GDP

and GPS hardware. This is an on-going process, allowing you to turn on and/or

connect devices in any order.

When the system detects the GDP, it queries the GDP for current status and self

check. The GDP LINKED light will change from red to green, indicating active

communication with the GDP.

Likewise when active communication with a GPS receiver antenna occurs the GPS

linked light will change from red to yellow. The light will change to green when

enough satellites have been acquired to provide accurate position information.

Checking status

When communication is initially established with the GDP, a self check of internal

hardware is performed. This includes the optional internal transmitter as well as

installed cards. Functional status is displayed as green, problems are shown in red.

A successful self test is shown below:

The GDP light indicates that the timing card, internal bus communications, and

mother board are present and functional.



The GDP battery light, when green, indicates the GDP’s internal battery is greater

than 11.7 volts. A yellow GDP battery light means the battery is greater than 11.2

volts, but less than or equal to 11.7 volts. A red GDP battery light means an

external battery or charger should be attached to the GDP. If you see the “GDP

LINKED” light go out in conjunction with a red GDP battery light, then the GDP has

shut down for low battery.

The TX battery light, when green, indicates the internal transmitter battery is greater

than 11.2 volts. The TX battery light when red, can indicate low battery, or that the

battery is not connected to the DNT system.

The TX link light, indicates that the main GDP hardware is in communication with

the internal transmitter. This communication takes place over one of the GDP’s

internal serial ports, and the TX link light indicates the status of that link. This status

light can change not only during initial self test operations, but during acquisition

operations as well.

The Cards light, indicates that all installed cards in the GDP passed their self test.

The Sync light, indicates that the acquisition operation is operating in real time at the

specified frequency. Initial self check operations do not affect this status light.

Decays must be gathered for each active channel at a given time depth. Raw data

points for each active channel are binned according to a windowing scheme,

packaged with status information, and streamed to the selected storage location.

Simplistically, this cycle must be completed before the next transmitter pulse or the

acquisition operation will fall behind the hardware. The ability of the software to stay

synchronized with the hardware, is a function of active channels, operation

frequency and cycles, and time depth associated with windowing each decay. A

pre-configured set up file can be used to default all configuration parameters in the

DNT software.



High level control of the acquisition

The upper left corner of the DNT screen is used to control high level operation of the

acquisition. Once the GDP is successfully linked with the controlling PDA,

acquisitions may be started and stopped by using the STOPPED/RUNNING button

located immediately to the right of the GDP LINKED button. Note that an active

GDP link with good status, is needed before any acquisition operations can be

performed.

Before starting the acquisition, select your operational frequency by right clicking the

“Frequency” box. The operational frequency is the rate at which measured decays

will be collected.

In conjunction with the operational frequency, you will want to pick a cycle count.

Divide the operational frequency by your choice of cycle count to determine the

effective acquisition frequency. The optimum frequency/cycle count choice

depends on the ambient 60hz/harmonics noise.



Finally, you must decide if you want survey line numbers to increment automatically

at each stop/start cycle in the survey. This can be convenient during production

operations.

To activate auto-line increment, press the embedded button within the

STOPPED/RUNNING button. Bright green indicates auto-line incrementing is

active. Note that the amount the line is incremented each time depends on your set

up screen.

Begin an acquisition, by pressing the “STOPPED” button.



How to interpret the Survey Grid display

The Survey Grid display provides graphical tracking of DNT cart measurements

merged with GPS position. In the SetUp screen you have the option of loading a

graphical background corresponding to your survey location. Your survey grid is

physically 400X480 pixels, so a survey area of 400X480 meters surveyed with a 1

meter square cart would yield a display of 1 pixel per cart measurement with a

resolution of 1 square meter.

If you don’t configure the Survey Grid, it defaults to a resolution of 10 pixels per

meter, yielding a 40 X 50 meter display. The size of the rectangle plotted at each

measurement, is determined by the receiver antenna size set in the “SetUp” display.

Receiver antenna size is determined from the Antenna ID field.



To customize the Survey Grid display, double click it. The GridSetup screen will be

displayed. Use this screen to control the resolution of the Survey Grid display.

You can load an optional Survey Grid image to be used as the background.

Use the ImageOrientation field to describe how the vertical axis of the image is

offset from True North.



Use the ImageScale field to define how many pixels are in a meter for the image.

Note that this is a floating point field, so values such as 0.0125 are valid..

You can use the “Resurvey” section of the set up screen if you want your survey or

re-survey area drawn on your image map. The main intent of this section is allow

resurvey of “gaps”, where each gap is defined as a polygon of points. Points are

defined as pairs and define the edges of your arbitrary shape. While it’s unlikely a

simple “gap” would just be a long rectangle, a simple 4 sided polygon needing 4

points to define it. More likely your polygons will be diamonds or canoe shapes.

The test square at the right can be used to check the qualitative shape of your

entered polygon.

You can load your resurvey polygon points, using a file. The file should be ASCII,

i.e. a text file, and should contain a pair of points on each line, one line for each

“corner” of the polygon. The loaded points will be displayed in the

“ManualResurvey” array.

The points are in meter offsets from a known base station position. Easterly offsets

are entered in the “X” box, while Northerly offsets are entered in the “Y”. Your point

set can either relist the first point to close the polygon, or let the program close

automatically.



Use the SurveyOrientation field to describe the orientation of the Survey Grid display

as an offset from True North.

Use the SurveyScale field to describe the displayed resolution in the Survey Grid

display on the main screen. The units of this field are pixels per meter. Values of 5

to 10 should be typical if you want to see meaningful coverage displays.



Controlling real time channel display

The real time channel display allows you to control which channels are displayed in

real time. A choice of full decay or profile is possible.

DETERMINING WHICH CHANNELS ARE AVAILABLE FOR MONITORING

Look to the right of the plotting area, and you will see a set of channel control slides.

Slides which are grayed out and disabled indicate that the channel is either

physically not present in the GDP or has been turned off in the SetUp screen.

In the example above, channels 2 and 3 are either turned off or not present in the

GDP. In the example below, while all 3 channels are active, only channel 1 will be

displayed in real time.



You can activate/deactivate channels for real time display at any time, even if the

acquisition is currently taking place.

SETTING THE TYPE OF REAL TIME DISPLAY

You have two choices of real time display. Either a profile or decay display is

possible. If a “decay” display is selected, then all active channels will have all

windowed measurements displayed on a log-log graph. Each newly acquired data

block will cause the display to refresh completely.



If a “profile” display is selected, then all active channels will have only a single

window value displayed for each measured decay. The single window value is

simply plotted in order of appearance, and is only nominally related to position in the

survey.

Select the window to be profiled in the indicated box. If this is changed while

profiling is active, past profile values will not be updated to reflect the new

monitoring window.



USING THE SET UP SCREEN

The SetUp screen is accessed by pressing the “SetUp” button on the lower right of

the main screen. The set up screen lets you record and set static parameters

associated with the acquisition. These parameters are organized into groups.

Using Configuration Files

Configuration files can be used to load saved or pre-configured values for all DNT

set-up parameters. Use the “Configuration File” control to browse for and use

configuration files. Use the “Load” or “Save” buttons appropriately.



Survey Parameters

Survey parameters describe the process of acquiring data at a given survey

location.

RECORDING OPERATOR AND JOB NAMES

The Operator and Job names are simply recorded in the survey data base. They do

not affect the acquisition operation. Simply the entry field of your choice and enter

the names using the keyboard or pen interface.

SELECTING STORAGE TARGET FOR ACQUIRED DATA BLOCKS

The storage target control determines where acquired data blocks will be stored.

Your choice of storage target strongly affects acquisition synchronization with the

hardware and how much information your PDA can display while the acquisition is

running.

You can store data on the GDP’s flash card, in the GDP’s memory, or in the PDA.

Selecting the GDP’s memory or the PDA as the storage target will maximize your

acquisition performance. Storing onto the GDP’s flash card can significantly slow

your acquisition. If you do not have the PDA selected as a storage target, only

acquisition status, GDP block #, and a single profile channel will be displayed in real

time on the PDA.

If you are storing data on the GDP, and less than 1MB of storage remains, the GDP

status light will change from green to red.



RECORDING THE SURVEY LINE

You can record a numerical line # to create a set of all data blocks taken along a

physical line in your survey. Optionally, you can record a text line tag which may

include your Northing/Easting orientation or just a simple name. These line number

identifications will be associated with each subsequent stored data block.

You can also set the “Line Increment” control to a positive or negative value. If you

enable auto line incrementing on the main DNT control screen, your initial line # will

be incremented or decremented as entered. An entry of zero disables auto-line

increment/decrement.



Channel Parameters

Channel parameters define how physical GDP channels are used in subsequent

acquisitions.

DETERMINING WHICH CHANNELS ARE PHYSICALLY PRESENT IN THE GDP

Channels which are “grayed out” are not physically present in the GDP. You will not

be able to manipulate any channel parameters on grayed out channels. In the

example above channels 2 and 3 are not physically present in the GDP.

Green “Gain” and “Level” lights mean the GDP card passed its gain stage and level

self checks. When no data blocks have been acquired, the WindowVal field will

contain the actual measurement of a 1 Volt calibration signal fed into the card.

Otherwise it will contain the latest value of the monitoring window associated with

the most recently acquired decay.

SETTING THE CHANNEL COMPONENT

The channel component is a label, indicating the orientation of the receiver antenna.

Horizontal antennas are labeled “Z”.



SETTING GAIN BEHAVIOUR FOR ALL CHANNELS

You can set the channels for manual, automatic, or automatic noisy gain. Manual

gain means active channels will use the gain you manually set using the gain

controls. Automatic gain modes mean the GDP will set the gains at the beginning of

each acquisition sequence. Noisy gain mode means the GDP will allow an

additional factor of 2 to guard against clipping the signal.

Gain settings apply to all active channels. Currently there is no method for having

different gain modes operating on individual channels.

USING THE GAIN STAGE DISPLAYS

If you have selected manual gain mode, you can use the gain controls for each

channel to set the gain for that channel. To set the gain stage of your choice, right

click the stage. A list of possible gain values will be displayed. Traditionally, Zonge

displays gains as a power of 2. So selecting a 3 yields a gain of 8, a 0 yields a gain

of 1 etc.

If you have selected one of the auto gain modes, the stages will be used to show

actual gain values obtained by the auto gain routine within the GDP. While you can

set values for gain stages when operating in autogain mode, these values will be

ignored once acquisition begins.



SEEING CHANNEL VALUES IN REAL TIME

If you bring up the SetUp screen while the acquisition is taking place, you will see

new values displayed in the “WindowVal” field as each data block is taken.



Transmitter Parameters

The SetUp screen contains a group of parameters concerning the operation of the

transmitter. The two main parameters which affect operation, are the TX Shunt, and

TX current controls.

SETTING THE TRANSMITTER ID

The Transmitter ID field lets you select from a pre-defined list of known transmitter

antennas. Selecting a known antenna will default physical parameters associated

with the antenna.

If you a using an antenna which is not listed or was built by a third party, select the

“3rd

Party” option in the Transmitter ID field. Upon selection of the “3rd

Party” choice,

three additional fields will be displayed.

Enter the length and width of your transmitter antenna, as well as the number of

turns or loops of wire in the antenna. Note that the shunt resistor will not be

defaulted, and you will have to determine the optimum value for bleeding off system

response.



SETTING THE SHUNT RESISTOR

If you are using a known transmitter antenna, it’s recommended that you take the

default value for the shunt resistor. If you are using a third party antenna, you will

need to set the shunt resistor appropriately. Choice of shunt resistor, minimizes the

effect of system response in the transmitter/receiver antenna system.

A poor choice of resistor, can lead to a sustained system response which can mask

the actual decay being measured. You will need a scope to test system response,

contact Zonge Engineering if you are not familiar with Shunt Resistor determination

procedures.



SELECTING MANUAL OR AUTOMATIC CURRENT CONTROL

By setting the current toggle switch to “Max”, the internal transmitter will maximize

current output to the transmitter loop.

If set to “Manual”, the internal transmitter will attempt to hold the current output

constant at the entered value.

RECORDING TRANSMITTER ANTENNA PARAMETERS

This set of parameters is used to record information about the physical transmitter

antenna. “TX X” records the X dimension of the antenna in meters. Likewise, “TX

Y” records the Y dimension of the antenna in meters. The “TX turns” field records

how many turns of wire are in the transmitter antenna. These values are used in

off-line data processing, and are not critical to the actual acquisition operation.



Receiver Parameters

Receiver parameters are used to record physical information about the receiver

antenna. A subtlety, is that the entered antenna ID is used to calculate rectangular

plot rectangle size on the Survey Grid display.

SETTING THE RECEIVER ANTENNA ID AND HOW IT IS USED

Enter the receiver antenna ID in the field labeled “ID”. This ID will access a look up

table, to determine the size and moment of the receiver antenna. This size in

conjunction with image scaling information will control the size of displayed survey

rectangles on the Survey Grid display of the main screen.

Like Transmitter parameters, a selection of “3rd

Party” will display additional fields

allowing you to record physical properties of your antenna.



Decay Parameters

These parameters control how DNT decays are measured and processed prior to

storage. Choice of these parameters results in processing of raw measured values

which cannot be reversed.

SELECTING TIME DEPTH FOR WINDOWING

The first parameter you should select is the Window set. Choices of Zonge

standard, Shallow, or Custom are possible. The Zonge Standard window set allows

for raw decay measurements of 2ms duration, while the Shallow window set allows

for 600us durations. A custom window set can have a near arbitrary time depth as

determined by the total point count in the window set.

Naturally, your selection of window set has performance ramifications. The shallow

window set can be collected in approximately 1/3 the time of the Zonge Standard

window set. In all cases, even with Custom Window sets, 31 windows must be

defined.



SETTING THE MONITOR WINDOWS FOR REAL TIME PROFILING

Of the 31 windows in any window set, you can choose a single window for real time

monitoring purposes. Your choice of window will be used for real time profile

displays as well as updates to the “WindowVal” field of the channel parameters

display. Selecting the best window for monitoring, is a function of your

transmitter/receiver antenna system. Ideally you would like to maximize the signal

to noise ratio of the measured decay while minimizing measured system response.

As measured system response falls off more quickly than energized earth response,

the deeper you selected window in time, the less measured system response will

appear in your window. However, the energized earth response is decaying as well,

getting closer to the noise level with each higher window. Making several

observations of real time decay displays can help you to pick an optimum monitoring

window.

CUSTOMIZING THE DECAY WINDOWS

If you know the expected decay of an embedded object that you are conducting a

survey for, you can design a custom window set to capture that decay. Contact

Zonge technical support for assistance. To activate custom windows, click the light

next to the “Windows” selection box. The light will change to bright green, and

display of current window values, “Window Widths” will be shown.



You can scroll through the “Window Widths” display, making changes as needed. If

you have “Zonge Standard” or “Shallow” windows selected when you activate the

“Window Widths” display, the values for that window set will be used to default the

“Window Widths” display. As soon as you make a change to the “Window Widths”

display, the “Windows” selection control will automatically change to “Custom”.

RECORDING DELAY TIMES

Delay times (entered in units of micro-seconds), are used to account for system

response effects. The TX delay field characterizes actual transmitter turn off time.

Ideally it would be optimal if the transmitter could instantly shut off current flow to the

transmitter antenna. Physically this is not possible, so the acquisition of the

measured decay is delayed from when the TX off hardware control signal is output.

The transmitter/receiver antenna pair stores transmitter turn off energy internally.

Time must be allowed for the shunt resistor to dissipate this energy. The Antenna

delay field is used for this purpose. Finally the anti-alias filter on the A/D board has

a time dependent behavior, this delay is added into the total delay prior to beginning

decay measurements.



ARCHIVING DATA

Data cache have pre-defined names which are kept the same for stability between

jobs. The cache on the GDP is always named NTFAST.DNT, while the cache on

the PDA is always named NTPDA.DNT. However, after collecting your data cache

you may rename it according to the procedures associated with your specific job.

Use the “Archive” button located below the “Setup” button on the lower right side of

the DNT main screen. The archive screen is controlled by using the file browser

control. Click the folder icon to the right of the “DNT archive” control to bring up a

standard browse dialog. Upon selecting or entering a file, DNT data will be

archived.

Use the “Remain” meter to estimate how much storage space is left on your target

device (see the setup screen section of this manual for selection of target device).



SYSTEM ERRORS

ABORT

This severity level will cause automatic termination of the software. An

acknowledgement dialog will be presented, and the program will terminate following

acknowledgement. Errors with this severity are rare and if you get one you should

note the message in the acknowledgement box, and contact Zonge for technical

support.

STOP

The stop severity level means that data collection can no longer continue because

data quality will be un-acceptable. Examples include loss of communication with

either the GDP or internal transmitter during acquisition operation, inconsistent

setup between the physical GDP and the GDP setup screen, or conflict with the

physical reality of the hardware.

CONTINUE

The continue severity level means that the error will not affect data quality, but the

operator should be made aware of the condition. Errors of this severity will cause

an acknowledgement dialog to appear. Upon acknowledgement processing will

continue. For example, a current below a given threshold will cause this error, and

is often indicative of an unconneted/unpowered/weak powered transmitter.

INFORMATION

The information severity level means that the error is so trivial that the operator

should not be bothered. Processing will continue un-interrupted and a message will

be logged to the System Status window.

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