Geometrics, Inc. G-822/G-823 Magnetometer Manual
16
H
CHANNEL 1 +
Analog channel #1 – differential input, 5v full scale, 2K
input
impedance.
J
CHANNEL 1 -
K
CHANNEL 2 +
Analog channel #2 – differential input, 5v full scale, 2K
input
impedance
L
CHANNEL 2 -
M
CHANNEL 3 +
Analog channel #3 – differential input, 5v full scale, 2K
input
impedance
N
CHANNEL 3 -
P
CHANNEL 4 +
Analog channel #4 – single ended
2.048v full scale, >10K
input
impedance
R
CHANNEL 4 -
S
CHANNEL 5 +
Analog channel #4 – single ended
2.048v full scale, >10K
input
impedance
T
CHANNEL 5 -
U,V
Not used
Note: 1) All analog channels have 12 bit resolution
1%; 2) Differential channels 1, 2 and 3 may be
able accept other full-scale voltages if original order called for custom input specification - consult the
factory if you suspect that your system has non-standard input ranges; 3) If the single ended channels 4
or 5 are used, the signal source must be operated from a power source that is isolated from power
ground.
7.1 CM-201 Output Format
The output data format of the G-823A is programmable. For example each of the A/D
channels can be added or removed from the output data stream by sending the appropriate
commands to the CM-201. There are several other commands that are discussed in detail
below.
Figure 12 shows the standard single counter configuration. Commands from the PC are
sent out the computer RS-232 transmit pin (TxD) to the counter. Magnetometer and other
data are read on the computer receive pin (RxD).
Figure 12. Schematic of CM-201, magnetometer, and computer connections
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