Reference Channel - Ametek 7124 Instruction Manual

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

6.7.02 Reference Channel

REFMODE [n]
6-12
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
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.
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.
AC Gain control
Sets the gain of the signal channel amplifier according to the following table:-
n AC Gain
0 0 dB
1 6 dB
2 12 dB
3 18 dB
4 24 dB
5 30 dB
6 36 dB
7 42 dB
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 AC Gain
8 48 dB
9 54 dB
10 60 dB
11 66 dB
12 72 dB
13 78 dB
14 84 dB
15 90 dB