Chapter 6, COMPUTER OPERATION
6-11
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
DCCOUPLE [n] Input coupling control
The value of n sets the input coupling mode according to the following table:
n Coupling mode
0 AC coupled
1 DC coupled
SEN [n]
SEN. Full-scale sensitivity control
The value of n sets the full-scale sensitivity according to the following table,
depending on the setting of the IMODE control:
n full-scale sensitivity
IMODE=0 IMODE=1 IMODE=2
1 2 nV 2 fA n/a
2 5 nV 5 fA n/a
3 10 nV 10 fA n/a
4 20 nV 20 fA n/a
5 50 nV 50 fA n/a
6 100 nV 100 fA n/a
7 200 nV 200 fA 2 fA
8 500 nV 500 fA 5 fA
9 1 µV 1 pA 10 fA
10 2 µV 2 pA 20 fA
11 5 µV 5 pA 50 fA
12 10 µV 10 pA 100 fA
13 20 µV 20 pA 200 fA
14 50 µV 50 pA 500 fA
15 100 µV 100 pA 1 pA
16 200 µV 200 pA 2 pA
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