Zonge DP-32 II Operating and installation instructions

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 MΩat 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 µsec
 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-32II 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.

GDP-32II INSTRUCTION MANUAL
May 2002 Section 2, Page 14
Home
SELECT UP
,
SELECT DN
End - Parameters contained in certain fields have a set number of pre-
selected values. These values are contained in a “Rotary Table” and are accessed by
using the select keys. Note that these keys do not move the cursor but only select a value
found in the rotary table. An example of using these keys would be selecting frequency
and cycle count in binary increments, or stepping through the choices for line designation
in menu 2: N, E, S, W, NE, SE, SW, NW. These keys are also used to page through the
data and calibrate cache, one block or one frequency at a time.
11. Control Keys
This group contains frequently used keys that control the operation of the receiver.
Enter – Locks in parameters in the current screen and moves to the next screen or
engages a function after all parameters have been set.
Escape – Used to terminate data collection before the full number of stacks have been
acquired.
– Used to double the function of certain panel keys. This key is latched, so it is
not necessary to hold it down while pressing the second key.

DESCRIPTION OF THE GDP-32II RECEIVER
Section 2, Page 15 May 2002
CONTROL I/O PANEL (LEFT SIDE)
The Control I/O Panel is used to charge the batteries, cycle power to the receiver, control the
transmitter, and communicate with external devices.
All ports are MS (military spec) connectors. Cable attachment is made by:
 Lining up the slots on the
cable plug with the keys on
the outside of the panel
connectors.
 Pushing in the cable plug.
 Twisting the knurled ring to
the right.
Only the battery connector is
female, while the others are male.
The connectors are different sizes
to avoid misconnection.
1. TRANSMITTER I/O
Provides digital signals
used to directly control a
transmitter or to
synchronize with an XMT-
series transmitter controller.
To synchronize the GDP-
32II with an XMT
controller, the internal
crystal oscillator in both
instruments must be
precisely matched in
frequency and their counter
chains must be reset to a
common starting point. See
Section 6.2 for more
information.
2. POWER ON/OFF
The main power control to the receiver.
To turn ON the GDP-32II:
 Press the POWER ON/OFF button on the side panel.
 Press ON/OFF on the Front Panel. There will be a short delay and several menus will
be displayed during the warm-up sequence.
TRANSMITTER
I/O
BATTERY
CHARGE
POWER
ON/OFF
PARALLEL SERIAL
1
2
34
6
GPS
5
CONTROL I/O
F
igure 2.6 – Control I/O Panel

GDP-32II INSTRUCTION MANUAL
May 2002 Section 2, Page 16
To turn OFF the GDP-32II:
 Press to return to the Main menu.
 Press to access the Utilities menu.
 Press – Turn Power Off
The display now shows:
Press CONTINUE to turn off power.
Any other key to return to Main Menu.
 Press Enter . Wait for the receiver to shut down all of the analog cards and the
Zonge logo is displayed.
 Press and hold ON/OFF until the screen goes blank and you hear a series of single
“beeps”. See Section 3.3.
 Press the POWER ON/OFF button on the Control I/O side panel. The Crystal
Oscillator power light will turn off.
NOTE – Turning the receiver completely off causes the synchronization between the
receiver and the transmitter controller to be lost.
3. PARALLEL
The bi-directional parallel port is used to transfer data from the LCD screen to a printer,
or from the hard disk to a computer, printer, or other output device.
4. SERIAL
The RS-232C serial port is used to output data to a computer, or to input calibration data.
This connector is compatible with a standard IBM-PC compatible COM port. (Default
transfer values are: 9600 baud, no parity, 8 data bits, 1 stop bit.)
5. GPS OPTION
Optional equipment on the GDP-32II, an internal GPS receiver.
6. BATTERY CHARGE
The Battery Charge port connects the GDP-32II to a battery charger or to an external 12-
volt DC power supply.

DESCRIPTION OF THE GDP-32II RECEIVER
Section 2, Page 17 May 2002
Figure 2.7 (a) - Analog I/O Panel for the small
case GDP-32IIT
Figure 2.7 (b) - Analog I/O Panel for the large
case GDP-32II
INPUT
CHANNELS 1-6
ANALOG I/O
CALIBRATOR
CAL+ CAL- COM
CASE
GND
CH1
++++ +
CH2 CH3 CH4
-
+
-
+
-
--- -
CH5 CH6
INPUT
CHANNELS 9-16
ANALOG I/O
INPUT
CHANNELS 1-8
CALIBRATOR
CAL+ CAL- COM
CASE
GND
CH1
++
+
CH2
CH4
--
-
+
CH3
-

GDP-32II INSTRUCTION MANUAL
May 2002 Section 2, Page 18
ANALOG I/0 PANEL
The Analog I/O Panel is located on the right side of the receiver. The small case GDP-32II is
configured for six-channel input and the large case for sixteen-channel input. Figure 2.7(a)
shows the small case Analog I/O panel. Figure 2.7(b) shows the large case Analog I/O panel.
1. ANALOG INPUT – CH 1, CH2, CH3, CH4, (CH5, CH6)
The analog binding posts provide a convenient way to connect external input signals to
the first four channels in the large case GDP, or all six channels in the small case GDP.
The channel notation indicates the appropriate receiver channel and polarity. The upper
(+) terminal is for “high” input and the lower (-) terminal is used as the “low” input.
Additional channel input is handled through the two 26 pin MS connectors described
below
2. CALIBRATOR – CAL+, CAL-, COM, and CASE GROUND
The two CAL terminals provide external differential calibration signals. Output levels
and period (frequency) are selectable by the operator, from the Diagnostics program or
the Field Survey programs.
CAL+ and CAL- terminals provide a balanced differential signal for calibration and
system checkout.
COM is the electrical common terminal for the entire receiver and serves as a zero-volt
reference for common mode.
CASE GND is the case ground, which is isolated from the electronics ground. This is the
only common point between the electronics and the case. It is often beneficial in high-
noise areas and at high frequencies to connect analog ground to case ground. See the
Field Survey program sections for further information. During normal operation COM
and CASE GND are connected together.
3. INPUT CHANNELS
26 pin MS connectors are used to connect cable arrays, the lid patch panel, the IN-32
connection panel, the SC-8 Signal Conditioner, or the MX-30 Multiplexer Box to the
analog input. The small case GDP-32II has one input connector for up to 6 channels. The
large case GDP-32II has two input connectors for channels 1 – 8 and 9 – 16.