Chapter 6, COMPUTER OPERATION
6-11
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 Main Controls 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:
n
1
Selection
0 Off
1 Enable 50 or 60 Hz notch filter
2 Enable 100 or 120 Hz notch filter
3 Enable both filters
n
2
Notch Filter Center Frequencies
0 60 Hz (and/or 120 Hz)
1 50 Hz (and/or 100 Hz)
6.7.02 Reference Channel
REFMODE [n] Reference mode selector
The value of n sets the reference mode of the instrument according to the following
table:
n Mode
0 Single Reference / Virtual Reference mode
1 Dual Harmonic mode
2 Dual Reference mode
NOTE: When in either of the dual reference modes the command set changes to
accommodate the additional controls. These changes are detailed in section 6.7.14
IE [n] Reference channel source control (Internal/External)
In Single Reference and Dual Harmonic mode, the value of n sets the reference input
mode according to the following table:
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