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-32
II
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-32
II
has one input connector for up to 6 channels. The
large case GDP-32
II
has two input connectors for channels 1 – 8 and 9 – 16.
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