Chapter 6, COMPUTER OPERATION
6-9
6.7 Command Descriptions
This section lists the commands in logical groups, so that, for example, all
commands associated with setting controls which affect the signal channel are shown
together. Appendix G gives the same list of commands but in alphabetical order.
6.7.01 Signal Channel
IMODE [n] Current/Voltage mode input selector
The value of n sets the input mode according to the following table
n Input mode
0 Current mode off - voltage mode input enabled
1 High bandwidth current mode enabled - connect signal to B (I) input connector
2 Low noise current mode enabled - connect signal to B (I) input connector
If n = 0 then the input configuration is determined by the VMODE command.
If n > 0 then current mode is enabled irrespective of the VMODE setting.
VMODE [n] Voltage input configuration
The value of n sets up the input configuration according to the following table:
n Input configuration
0 Both inputs grounded (test mode)
1 A input only
2 -B input only
3 A-B differential mode
Note that the IMODE command takes precedence over the VMODE command.
DEMOD2SRC [n] Second stage demodulator signal source
In the dual reference mode, the value of n sets the source of the signal for the second
stage demodulators according to the following table:
n Signal source
0 Main signal channel ADC (i.e. both demodulators are fed the same signal)
1 ADC1 - rear panel auxiliary ADC input
2 Demodulator 1 X channel output - this is the Tandem demodulation mode
FLOAT [n] Input connector shield float/ground control
n Selection
0 Ground
1 Float (connected to ground via a 1 k resistor)
FET [n] ] FET input selection
The value of n controls the input device used at the signal input according to the
following table:
n Input device
0 Bipolar
1 FET
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