Zonge GDP-32 User manual

November 2002
GDP-32II Manual
Table of Contents
LABELS
1. Introduction Introduction
1.1 Warranty ................................................................... 2
1.2 Product Information .................................................. 3
2. Description Of The GDP-32II Receiver Description
2.1 Overview................................................................... 2
2.2 Specifications............................................................ 3
2.3 GDP-32II Case........................................................... 8
3. System Start Up Start Up
3.1 Initial Receiver Check............................................... 2
3.2 Powering Up The GDP-32II ......................................4
3.3 Shutting Down The GDP-32II ................................... 5
3.4 Charging Batteries.....................................................6
4. Quick Start Quick Start
4.1 Introduction............................................................... 2
4.2 Receiver Start-Up...................................................... 3
4.3 Enter Survey Parameters........................................... 5
4.4 Calibration.................................................................7
4.5 System Check.......................................................... 11
4.6 Synchronization ......................................................13
4.7 Acquire Field Data.................................................. 15
4.8 Check Data In The Data Cache............................... 15
4.9 Data Transfer To A Computer ................................ 16
5. Accessing Programs Access
5.1 The Main Program Menu.......................................... 2
5.2 Field Survey Program Screens .................................. 5
5.3 Scaling ....................................................................13
6. Receiver Setup Setup
6.1 Calibration.................................................................2
6.2 Synchronizing Timing Circuits............................... 14
6.3 Measuring Contact Resistance ................................ 27
6.4 Setting The Powerline Notch Filter......................... 28
6.5 Gains ....................................................................... 29
6.6 Bits Of Resolution................................................... 38
7. Handling Data Data
7.1 Monitoring Analog Signals....................................... 2
7.2 Viewing Data ............................................................ 3
7.3 Accessing Caches...................................................... 7
7.4 Initializing Caches...................................................10
7.5 Configuring Ports....................................................11
7.6 Outputting Data....................................................... 13
7.7 Input Antenna Calibration Data .............................. 16
7.8 Up-Loading Program Files Via The LAN............... 18
7.9 Connecting the GDP-32II to a Laptop via Network.19
LABELS
8. RPIP RPIP
8.1 Introduction .............................................................. 2
8.2 Program Operation ................................................... 3
8.3 Data Collection......................................................... 7
8.4 Field Configurations ............................................... 14
9. TDIP TDIP
9.1 Introduction .............................................................. 2
9.2 Program Operation ................................................... 3
9.3 Data Collection......................................................... 8
9.4 Sample Data Blocks................................................ 15
9.5 Algorithms.............................................................. 17
9.6 Time Domain Window Timing Information .......... 18
9.7 Field Configurations ............................................... 19
10. CR / HACSAMT CR
10.1 Introduction .............................................................. 2
10.2 CR Program Operation ............................................. 3
10.3 Gathering Data........................................................ 10
10.4 A Note On Phase .................................................... 16
10.5 A Note On Scaling.................................................. 16
10.6 3-Point Decoupling................................................. 17
10.7 Sample Data Blocks................................................ 18
10.8 Notes On Field Configurations............................... 20
10.9 Sample Menus For 'LABROX' Option ................... 21
10.10 Sample Menus For 'HACSAMT' Option................ 24
10.11 Field Configurations............................................... 26
11. CSAMT CSAMT
11.1 Introduction .............................................................. 2
11.2 Fixed Function Keys................................................. 3
11.3 CSAMT Program Operation..................................... 4
11.4 Gathering Data........................................................ 11
11.5 A Note On Variable A-Spacing.............................. 16
11.6 A Note On Phase .................................................... 16
11.7 A Note On Scaling.................................................. 16
11.8 Restrictions............................................................. 17
11.9 Sample Data Blocks................................................ 21
11.10 Notes On Field Configurations............................... 22
11.11 Magnetic Coil Connections .................................... 22
11.12 Field Configurations............................................... 23
11.13 Magnetic Sensors Field-Check ............................... 25

GDP-32II INSTRUCTION MANUAL
November 2002 Table of Contents, Page 2
LABELS
12. TEM TEM
12.1 Introduction............................................................... 2
12.2 Fixed Function Keys ................................................. 3
12.3 TEM Program Operation .......................................... 4
12.4 Powerline Noise Rejection...................................... 12
12.5 Gathering Data ........................................................ 13
12.6 A Note On Scaling .................................................. 17
12.7 Sample Rates And Antialias Filter Delays.............. 18
12.8 TEM Window Centers For Zero Delay................... 19
12.9 Window Centers And Widths ................................. 20
12.10 Sample Data Blocks ................................................ 21
12.11 Field Setups and Magnetic Antennas...................... 22
12.12 Estimating Ramp-Off Time..................................... 22
12.13 TEM Receiver / Transmitter Arrays........................ 23
12.14 First Window Time Determination ......................... 24
12.15 Field Configurations ............................................... 25
12.16 Equal-Interval Mode TEM...................................... 30
12.17 Method To Field-Check Magnetic Sensors............. 32
12.18 The NanoTEM System............................................ 33
12.19 NanoTEM Hookup Directions ................................ 34
12.20 NT-32 Transmitter System...................................... 35
12.21 NanoTEM Turnoff Times ....................................... 38
12.22 NanoTEM Field Data Cache................................... 38
12.23 NanoTEM Window Centers.................................... 41
12.24 NanoTEM Sample Data .......................................... 44
12.25 The NanoTEM Calibrate Box ................................. 45
12.26 NanoTEM Field Setup ............................................ 49
12.27 Equal-Interval Mode, NanoTEM ............................ 51
13. MT / AMT AMT
13.1 Introduction............................................................... 2
13.2 Fixed Function Keys ................................................. 3
13.3 MT/AMT Program Operation................................... 4
13.4 Gathering Data ........................................................ 13
13.5 A Note On Variable A-Spacing .............................. 17
13.6 A Note On Phase..................................................... 17
13.7 A Note On Scaling .................................................. 17
13.8 Restrictions ............................................................. 18
13.9 Notes On Field Configurations ............................... 23
13.10 Cascade Decimation Overview............................... 24
13.11 Data Dump Utility................................................... 26
13.12 Time Series File Format.......................................... 26
13.13 Time Schedule ........................................................28
13.14 Field Configurations ............................................... 33
13.15 Method To Field-Check Magnetic Sensors............. 37
14. Plotting Routines Plot
14.1 Introduction............................................................... 2
14.2 Summary Of Plots For Different Data Types............ 4
14.3 Examples of Operation.............................................. 5
14.4 Error Messages..........................................................6
LABELS
15. Mathematical Algorithms Mathematics
15.1 Standard Error Of The Mean (SEM) ........................ 2
15.2 3-Point Decoupling................................................... 3
15.3 A Note On Resistivity Calculations.......................... 4
15.4 Resistivity Calculations ............................................ 4
15.5 Useful CSAMT Equations...................................... 11
15.6 Useful TEM Equations ........................................... 12
16. GDP-32II Design Design
16.1 Basic Design Characteristics .................................... 2
16.2 Receiver Layout........................................................ 4
16.3 Card-PC MPU Board................................................ 8
16.4 Bd287 Front Panel Board ......................................... 8
16.5 Bd183 Analog Board.............................................. 10
16.6 The Calibration And Timing Board........................ 18
16.7 The Battery Compartment ...................................... 23
16.8 The Crystal Oscillator............................................. 23
17. Maintenance And Trouble-Shooting Maintenance
17.1 Board Functions And Diagnostics ............................ 2
17.2 Handling Boards and EPROMs .............................. 14
17.3 Digital Board Problems .......................................... 16
17.4 Analog Board Problems.......................................... 16
17.5 Battery And Power Problems ................................. 20
17.6 Synchronization Problems...................................... 24
17.7 Cold Weather Operation......................................... 28
17.8 Pinouts For Connectors .......................................... 29
17.9 Error Messages ....................................................... 36
18. GDP-32II User's Notes User's Notes
18.1 Use Of The Attenuator ............................................. 2
18.2 Recalibrate When Replacing Analog Cards ............. 2
18.3 Connecting Peripherals To The GDP-32II ................ 3
18.4 Always Measure Contact Resistance – CRES .......... 3
18.5 XMT-32 Transmitter Controller Specifications........ 4
18.6 Transmitter Control Interface ................................... 5
18.7 Resistance of Standard Gauge Wire ......................... 6
18.8 Setup Instructions for Loadbank LB2500................. 7
18.9 Antenna Designations............................................... 8
18.10 Serial Port Data Transfer Using HyperTerminal ...... 9
18.11 Local Area Network (LAN) Connection ................ 10
18.12 Black Screen When Resetting The GDP-32II ......... 10
18.13 Observe Proper Turn-Off Procedure....................... 10
19. Fast Transient Electromagnetics NanoTEM
19.1 The NanoTEM System ............................................. 2
19.2 NanoTEM Hookup Directions.................................. 3
19.3 NT-32 Transmitter System ....................................... 4
19.4 NanoTEM Turnoff Times......................................... 7
19.5 NanoTEM Field Data Cache .................................... 7
19.6 NanoTEM Window Centers ................................... 10
19.7 NanoTEM Sample Data.......................................... 13
19.8 The NanoTEM Calibrate Box................................. 14
19.9 NanoTEM Field Setup............................................ 18
19.10 Equal-Interval Mode, NanoTEM............................ 20
19.11 Configuring Ports ................................................... 22
19.12 Outputting Data ...................................................... 24

May 2002
1. INTRODUCTION
1.1 WARRANTY ............................................................................... 2
1.2 PRODUCT INFORMATION .................................................... 3
HARDWARE ..................................................................................................... 3
SOFTWARE ...................................................................................................... 5

GDP-32II INSTRUCTION MANUAL
May 2002 Section 1, Page 2
1.1 WARRANTY
Zonge Engineering (Zonge) warrants the electronic equipment it manufactures for a period of one
year from shipping date. Equipment that indicates a defect in workmanship or material will be
repaired or replaced at Zonge's option and returned to the customer. Returned equipment must
be properly packaged and sent freight prepaid to the Zonge factory. All inbound and outbound
freight and customs charges are the responsibility of the customer. Items not covered by this
warranty are:
1. Equipment that has been modified, altered or repaired by someone who is not authorized
by Zonge.
2. Equipment that shows misuse, abuse, negligence or improper connection, alignment or
operation.
3. Equipment that has been connected to devices that have not been authorized by Zonge
(such as non-Zonge transmitter controllers).
4. Motor generators, alternators, trailers, and backpack frames. Each of these items carries a
90-day warranty.
5. Maintenance items such as belts, filters, batteries, fuses, tires, output GTO, IGBT and
SCR diodes. These items are considered consumable and are not warranted by Zonge.
This warranty is in lieu of all other warranties, expressed or implied on our part. Zonge may
make statements as to the suitability or fitness of the product covered by this warranty for
particular purposes. These statements do not apply to any other purpose. No other warranties
apply; whether written or oral, to products manufactured by Zonge.
Any warranty questions or requests for repairs and replacement parts should be handled directly
with a Zonge representative. Please include the instrument serial numbers with all
correspondence.
Zonge reserves the right to change specifications and prices without notification.

INTRODUCTION TO THE GDP-32II
Section 1, Page 3 May 2002
1.2 PRODUCT INFORMATION
Client:
Address:
Contact:
Phone: Fax:
RECEIVER MODEL:
SERIAL NUMBER:
DELIVERY DATE:
HARDWARE
Analog Boards (BD183)
Serial Number: Date sent: Notes:
Serial Number: Date sent: Notes:
Serial Number: Date sent: Notes:
Serial Number: Date sent: Notes:
Serial Number: Date sent: Notes:
Serial Number: Date sent: Notes:
Serial Number: Date sent: Notes:
Serial Number: Date sent: Notes:
Serial Number: Date sent: Notes:
Serial Number: Date sent: Notes:
Serial Number: Date sent: Notes:
Serial Number: Date sent: Notes:
Serial Number: Date sent: Notes:
Serial Number: Date sent: Notes:
Serial Number: Date sent: Notes:
Serial Number: Date sent: Notes:

GDP-32II INSTRUCTION MANUAL
May 2002 Section 1, Page 4
Timing and Calibrate Board (BD244 or BD288)
Serial Number: Date sent: Notes:
Serial Number: Date sent: Notes:
Front Panel Board (BD287)
Serial Number: Date sent: Notes:
Serial Number: Date sent: Notes:
CPU Board (it/SLC )
Serial Number: Date sent: Notes:
Serial Number: Date sent: Notes:
Firmware Version Number:
Receiver Configuration:

INTRODUCTION TO THE GDP-32II
Section 1, Page 5 May 2002
SOFTWARE
EPROMs
Version
Sent
RPIP
Version
Sent
CR
Version
Sent
TDIP
Version
Sent
CSAMT
Version
Sent
TEM
Version
Sent
AMT/MT
Version
Sent
OTHER
Version
Sent

May 2002
2. DESCRIPTION OF THE GDP-32II RECEIVER
2.1 OVERVIEW ................................................................................ 2
2.2 SPECIFICATIONS..................................................................... 3
ELECTRICAL SPECIFICATIONS .......................................................................... 4
MECHANICAL SPECIFICATIONS ........................................................................ 5
2.3 GDP-32II CASE ........................................................................... 8
CASE LID - METER AND I/O PANELS ............................................................. 10
FRONT PANEL................................................................................................ 11
CONTROL I/O PANEL (LEFT SIDE) ................................................................. 15
ANALOG I/0 PANEL ....................................................................................... 18

GDP-32II INSTRUCTION MANUAL
May 2002 Section 2, Page 2
2.1 OVERVIEW
The GDP-32II Geophysical Data Processor is a universal, multi-channel receiver designed to
acquire virtually any type of electromagnetic or electrical data within the DC to 8 kHz
bandwidth. The GDP-32II design is the result of over 25 years experience with its predecessors,
the GDP-12, GDP-16 and GDP-32. Its design emphasizes software flexibility, optimum data
quality, practicality and ruggedness for harsh field conditions.
The GDP-32II is supported by a complete set of geophysical services at Zonge Engineering.
These services include:
Equipment sales and rentals
Geophysical consulting and training
Turn-key data processing
Custom Modeling and Processing Software
Contract field surveys

DESCRIPTION OF THE GDP-32II RECEIVER
Section 2, Page 3 May 2002
2.2 SPECIFICATIONS
The GDP-32II is designed for high quality data acquisition in harsh environments. Measurable
parameters include:
Resistivity
Induced Polarization (frequency or time domain)
Complex Resistivity (CR)
Controlled Source Audio Frequency Magnetotellurics (CSAMT)
Harmonic CSAMT (HACSAMT)
Frequency Domain EM (FEM)
Transient EM (TEM)
NanoTEM (a very early time TEM program)
Continuous NanoTEM
Natural Source MT
Natural Source AMT
Programs are stored on an internal flash disk and are software-selectable. Users can also develop
custom survey applications using the C programming language. However, this is a complicated
undertaking and should only be attempted with assistance from Zonge Engineering.
The GDP-32II operates in both the Frequency Domain and Time Domain. Twenty six (26)
frequencies can be selected in binary intervals between 0.000121 Hz and 8 kHz.
The GDP-32II is designed for multi-channel data acquisition. The large case GDP-32II can
accommodate up to sixteen channels for simultaneous measurements from DC to 8 kHz.
Multiple receivers can also be used together for n-channel acquisition.
The small case GDP-32IIT accepts a maximum of 6 analog channels. These channels can be a
mixture of high-speed NanoTEM acquisition boards (BD194) and the standard analog boards
(BD183). In either case, a maximum of 3 high-speed NanoTEM channels can be installed.

GDP-32II INSTRUCTION MANUAL
May 2002 Section 2, Page 4
ELECTRICAL SPECIFICATIONS
General
Description: Broadband, Multi-channel digital Electromagnetic receiver
Frequency Range: DC to 8 kHz
Numbers of Channels: 16 (maximum)
Survey Capabilities: Resistivity, IP (time and frequency domain), FEM, MMR,
CR, CSAMT, HACSAMT, TEM, NanoTEM, AMT, MT
Software Language: C and assembly
Power: 12V rechargeable batteries
Temperature Range: -40° to 60° C (-40° to 140° F)
Humidity Range: 0 to 90%
Time Base: Crystal clock with 5x10-10 per 24 hours aging rate
Analog Section
Input Impedance: 10 MΩ at DC
Dynamic range: 190 dB
Min detectable signal: ±0.03 µV
Max input voltage: ±32V
SP offset adjustment: ±2.25V in 69 µv steps (automatic)
Automatic gain setting: manual override, in binary steps from 1/8 to 216.
Signal Attenuator: Selectable 8:1
Calibration signal generation: Internal/external
Duty cycle selection: 50%, 100%
Filter Section
All filters are software controlled
Anti-alias filter, four-pole Bessel
Quad-notch filter: 50/150, 60/180 Hz; 50/150/250/450 Hz,
60/180/300/540 Hz, or other user specified ranges
Digital telluric filter
Analog to Digital Converter (Standard Analog Channel)
Resolution: 16 bits ±1/2 LSB
Conversion Time: 17 µ sec
Digitization Rate: 32 kHz maximum, per channel
One A/D per channel for maximum speed and phase accuracy

DESCRIPTION OF THE GDP-32II RECEIVER
Section 2, Page 5 May 2002
Digital Section
Microprocessors: 586 CPU
Memory: 16 Mb dRAM
Mass Storage: 32 Mb flash disk (256 Mb optional) (program and data)
Hard disk drives with capacities to 4.1 Gb.
Serial Ports: 2 RS-232C ports (16650) standard
Parallel Port: 1 SPP and EPP compatible printer port
Network Adapter 10-baseT Ethernet adapter standard (1 Mb/sec)
Crystal Clock: Optional GPS-Disciplined
Optional Ports Mouse, CRT (VGA), standard Keyboard.
Operating System MS-DOS and Windows-95 standard.
MECHANICAL SPECIFICATIONS
General
Large Case
Size: 43 x 41 x 22 cm (17 x 16 x 8.7 in)
Weight: 8-channel, 10 A-h battery pack: 16.6 kg (36.5 lb)
8-channel, 20 A-h battery pack: 20.5 kg (45 lb)
16-channel, 10 A-h battery pack: 19.1 kg (42 lb)
Enclosure: Heavy-duty, environmentally sealed aluminum case
Small Case
Size: 43 x 31 x 22 cm (17 x 12.2 x 8.7 in)
Weight: 6-channel, 10 A-h battery pack: 13.7kg (29 lb)
Enclosure: Heavy-duty, environmentally sealed aluminum case
Controls & Displays
LCD alphanumeric/graphic display, 480 x 320 pixels (½ VGA), with viewing contrast
adjustment
Sealed keyboard with 37 alpha-numeric keys and 30 function keys
Analog signal meters and analog outputs
Power Off/On

GDP-32II INSTRUCTION MANUAL
May 2002 Section 2, Page 6
Figure 2.1 - Large Case GDP-32II

DESCRIPTION OF THE GDP-32II RECEIVER
Section 2, Page 7 May 2002
Figure 2.2 - Small Case GDP-32IIT
1
2
34
5
61
2
34
5
6
25
50
25
50
25
50
25
50

GDP-32II INSTRUCTION MANUAL
May 2002 Section 2, Page 8
2.3 GDP-32II CASE
The GDP-32II is available in two case sizes. The large case GDP-32II (Figure 2.1) permits the
installation of up to sixteen analog channels for the DC to 8 kHz range. The small case GDP-32II
(Figure 2.2) permits the installation of up to six channels. The central portion of the case
contains the analog cards and timing/calibrate card. Input and output ports are mounted on side
panels. The keyboard and display are mounted on the receiver’s front panel.
1. Case Lid - Meter and I/O Panels
The case lid protects the front panel of the receiver and contains the meter/connection
panel. Three different Meter and I/O panels are available. The particular Meter and I/O
panel installed depends on the number of analog channels included in the GDP-32II. See
Figure 2.3.
2. Front Panel
The front panel contains the graphics liquid crystal display (LCD), the keypad, an analog
signal output connector, and the crystal oscillator power light. The 586 microprocessor,
hard disk, and SRAM boards are attached to the underside of the front panel. See Figure
2.4.
3. Control I/O Side Panel
The Control I/O panel, located on the left side of the GDP-32II receiver, is used to
interface the GDP-32II with external devices. It contains: a serial RS-232C port; a bi-
directional IBM-PC compatible parallel port; an external battery/charger port; an
ON/OFF button; and a transmitter control I/O port. See Figure 2.6.
4. Analog I/O Side Panel
The Analog I/O panel, located on the right side of the GDP-32II, provides connection
points for analog signal inputs, calibrator outputs, and both system and case grounds. See
Figure 2.7.
5. Battery Compartment - Large Case
The battery compartment is located on the bottom of the large case GDP-32II. It may be
removed by opening the clips holding the compartment to the main unit, and tilting it
back on its hinges.

DESCRIPTION OF THE GDP-32II RECEIVER
Section 2, Page 9 May 2002
Figure 2.3(a), (b), (c) – Meter and I/O Panels
Output
Output Output Output Output
Output
1
2
5
6
78910 11
12
13
14
15
16
3
4
1
2
5
6
78910 11
12
13
14
15
16
3
4
1
2
3
45
6
7
81
2
3
45
6
7
8
Analog Meters Binding Post Inputs, Channels 1 through 8
1
4
25
78
3
6
ZONGE ENGINEERING &
RESEARCH ORGANIZATION
TUCSON, ARIZONA USA
GROUND CASE
GROUND
BNC Connectors for Oscilloscopes Multi-Conductor MS Input 
Cable (to Analog I/O Panel)
Analog Input Port
Ground Jacks
Channel
Select
Switches
Output Output
1
2
5
6
78910 11
12
13
14
15
16
3
4
1
2
5
6
78910 11
12
13
14
15
16
3
4

GDP-32II INSTRUCTION MANUAL
May 2002 Section 2, Page 10
CASE LID - METER AND I/O PANELS
The Meter and I/O Panels, mounted on the inside of the case lids, are used for monitoring multi-
channel signals. While these panels are not required for receiver operation, they provide more
versatility in the field. Each GDP-32II is configured with an appropriate Meter and I/O panel
based on the number of channels specified at purchase.
Figure 2.3(a) shows a small case 2-channel Meter Panel. Figure 2.3(b) shows a large case 16-
channel Meter Panel. Figure 2.3(c) shows the large case 8-channel combined meter and
input/output panel.
1. Analog Meters
Zero-center. ± 5 volt analog meters monitor analog channel output. The meters are used
to determine SP levels at all frequencies, and to monitor signals at frequencies below 1
Hz.
2. BNC Output Jacks
Output jacks direct the signal to an external device (e.g. oscilloscope). The output jacks
are connected to the channel select switches on the I/O panel. The monitored signal is
identical to the signal presented to the ADC on each analog board.
3–4.Channel A and B Selectors
Select the channels for Meters A and B to monitor.
5. Analog Input Port
This 9-pin “D” connector connects the meter panel with analog voltages from the main
chassis.
6. Channel Input Connectors
The analog binding posts provide a convenient method for connecting up to eight receiver
channels to external signals.
7. MS Connector Cable
Connector cable for attachment to the Analog I/O panel.
8. Ground Jacks
An analog ground reference post and a case ground jack.

DESCRIPTION OF THE GDP-32II RECEIVER
Section 2, Page 11 May 2002
Figure 2.4 - GDP-32II Front Panel
FRONT PANEL
The front panel contains the display, keyboard, peripherals I/O and analog output port for the lid
meter panel. Operator communication with the internal machine is provided through this panel.
1. Liquid Crystal Display (LCD)
The 480 by 320 pixel, ½ VGA LCD presents GDP-32II information to the operator. The
LCD by default displays the upper left quarter of a normal 640 x 480 display. To view
other quarters of the screen, press followed by one of the rotary entry keys.
2. LCD Contrast Adjustment Keys and Backlight
The contrast control adjusts the bias voltage applied to the LCD to maximize the screen
contrast. The voltage is continuously variable. If the screen is too light or dark, press
or until the desired contrast is found. Pressing turns on the LCD
backlight.
ON/OFF
SELECT UP
Home
NEXT FIELD
Pg Dn
SELECT DN
End
PREV FIELD
Pg Up
Escape
Enter
1
480 x 320 ½ VGA
(LCD)
3
Crystal Oscillator
Power Light 6
Anolog Output Port
7
Power/Reset Keys
8
Designated & Soft
Function Keys (F1-F12)
5
Peripheral I/O
Connector (PIOC)
4
Alphabet Keys
9
Numeric Keys
10
Cursor Control &
Rotary Entry Keys
11
Control Keys
2
LCD Contrast Adjust
& Back Light

GDP-32II INSTRUCTION MANUAL
May 2002 Section 2, Page 12
3. Crystal Oscillator Power Light
This light indicates that power is being supplied to the crystal oscillator.
Note: If the Crystal Oscillator Power Light does not come on when the power switch is
turned on, the electronic circuit breaker may have been tripped due to a low battery
condition.
4. Alphabet Keys
– The GDP-32
II permits input of alpha-characters for certain labels in headers
such as Operator, Tx ID, Line, Job, and Spread.
5. Peripheral I/O Connector (PIOC)
This 37-pin D-style connector is used to plug in external devices such as a mouse,
keyboard, larger display, etc. See Figure 2.5.
Figure 2.5 – Peripheral I/O Cable
6. Analog Output Port
This 25-pin D-style connector is used to connect the lid panel with the analog output
voltage from each channel.
7. Power / Reset Keys
Press ON/OFF to turn on the receiver, after pressing the main power button on the I/O
panel on the left side of the GDP-32II case. To turn off the GDP, press this key and hold
down until you hear a series of single “beeps”. See Sections 3.2 and 3.3.
resets the GDP-32II, when pressed for more than 3 seconds. Pressing
in sequence also resets the GDP-32II. This key combination is usually
used only when the computer locks up and other keys will not work.
37 pin connector
Mouse connector
Keyboard connector
VGA display connector
Keyboard selector switch
COM2 connector
Ethernet connector

DESCRIPTION OF THE GDP-32II RECEIVER
Section 2, Page 13 May 2002
8. Designated-Function and Soft-Function Keys
There are six fixed-function keys located beneath the Soft Function Keys below the LCD
screen.
– Places the receiver in Data Mode. See Section 7 - Handling Data.
– Exits Data or Acquisition Mode and returns to the Main Program Menu.
– Enters the Calibrate and System Checking program from the Data Acquisition
Menu of a survey program. See Section 6.1 – Calibration.
– Enters the Automatic or Manual Gain Setting and SP Adjustment Menu from
the Data Acquisition Menu of a survey program. See Section 6.4 – Setting Gains. This
menu also permits the user to select the number of repeat data acquisitions.
- Automatically bucks out any self-potential (SP) or amplifier offset, for all
enabled channels when pressed while in the Data Acquisition Menu of a survey program.
- Measures the contact resistance or coil output resistance. See Section 6.3 -
Measuring Contact Resistance.
through are specific software-controlled keys. The function of these
keys change and they are undefined at times. When a Special Function key is active, the
bottom line of the LCD displays its current purpose.
9. Numeric Entry Keys
This portion of the data entry keypad is used to enter numeric values. changes
the sign of the numeric value. The space available in each field determines the number of
digits that can be entered. The decimal point is input as a numeric character.
10. Cursor Control and Rotary Entry Keys
This key group moves the cursor within the screen.
and move the cursor, up or down one line. and move the
cursor, one character at a time within a field.
Pg Dn
NEXT FIELD
and Pg Dn
NEXT FIELD
move the cursor to the beginning of the next or previous field, or
displays the data in the data cache, up or down one page at a time.