Reference Channel - Ametek 7280 Instruction Manual

Chapter 6, COMPUTER OPERATION
AUTOMATIC [n] AC Gain automatic control
LF [n

6.4.02 Reference Channel

REFMODE [n]
6-12
n AC Gain
0 0 dB
1 6 dB
2 14 dB
3 20 dB
4 26 dB
5 34 dB
6 40 dB
7 46 dB
8 54 dB
9 60 dB
10 66 dB
The value of n sets the status of the AC Gain control according to the following table:
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
n ] Signal channel line frequency rejection filter control
1 2
The LF command sets the mode and frequency of the line frequency rejection (notch)
filter according to the following tables:
n Selection
1
0 Off
1 Enable 50 or 60 Hz notch filter
2 Enable 100 or 120 Hz notch filter
3 Enable both filters
n Notch Filter Center Frequencies
2
0 60 Hz (and/or 120 Hz)
1 50 Hz (and/or 100 Hz)
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 6.4.14