Chapter 6, COMPUTER OPERATION
6-12
n full-scale sensitivity
IMODE=0 IMODE=1 IMODE=2
17 500 µV 500 pA 5 pA
18 1 mV 1 nA 10 pA
19 2 mV 2 nA 20 pA
20 5 mV 5 nA 50 pA
21 10 mV 10 nA 100 pA
22 20 mV 20 nA 200 pA
23 50 mV 50 nA 500 pA
24 100 mV 100 nA 1 nA
25 200 mV 200 nA 2 nA
26 500 mV 500 nA 5 nA
27 1 V 1 µA 10 nA
Floating point mode can only be used for reading the sensitivity, which is reported in
volts or amps. For example, if IMODE = 0 and the sensitivity is 1 mV the command
SEN would report 18 and the command SEN. would report +1.0E-03. If IMODE was
changed to 1, SEN would still report 18 but SEN. would report +1.0E-09
AS Perform an Auto-Sensitivity operation
The instrument adjusts its full-scale sensitivity so that the magnitude output lies
between 30% and 90% of full-scale.
ASM Perform an Auto-Measure operation
The instrument adjusts its full-scale sensitivity so that the magnitude output lies
between 30% and 90% of full-scale, and then performs an auto-phase operation to
maximize the X channel output and minimize the Y channel output.
ACGAIN [n] AC Gain control
Sets the gain of the signal channel amplifier according to the following table:-
n AC Gain n AC Gain
0 0 dB 8 48 dB
1 6 dB 9 54 dB
2 12 dB 10 60 dB
3 18 dB 11 66 dB
4 24 dB 12 72 dB
5 30 dB 13 78 dB
6 36 dB 14 84 dB
7 42 dB 15 90 dB
AUTOMATIC [n] AC Gain automatic control
n Status
0 AC Gain is under manual control, either using the front panel or the ACGAIN
command
1 Automatic AC Gain control is activated, with the gain being adjusted according
to the full-scale sensitivity setting
LF [n
1
n
2
] Signal channel line frequency rejection filter control
The LF command sets the mode and frequency of the line frequency rejection
(notch) filter according to the following tables:
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