Signal Channel Output Amplifiers - Ametek 7280 Instruction Manual

Chapter 6, COMPUTER OPERATION
SYNC [n]

6.4.04 Signal Channel Output Amplifiers

XOF [n
YOF [n
AXO
EX [n]
6-16
The TC. command is only used for reading the time constant, and reports the current
setting in seconds. Hence if a TC 15 command were sent and the noise measurement
mode was turned off, TC would report 15 and TC. would report 1.0E-01, i.e. 0.1 s or
100 ms.
Synchronous time constant control
At reference frequencies below 10 Hz, if the synchronous time constant is enabled,
then the actual time constant of the output filters is not generally the selected value T
but rather a value equal to an integer number of reference cycles. If T is greater than
1 cycle, the time constant is between T/2 and T. The parameter n has the following
significance:
n Effect
0 Synchronous time constant disabled
1 Synchronous time constant enabled
[n ]] X channel output offset control
1 2
The value of n sets the status of the X offset facility according to the following table:
1
n Selection
1
0 Disables offset
1 Enables offset facility
The range of n is ±30000 corresponding to ±300% full-scale.
2
[n ]] Y channel output offset control
1 2
The value of n sets the status of the Y offset facility according to the following table:
1
n Selection
1
0 Disables offset facility
1 Enables offset facility
The range of n is ±30000 corresponding to ±300% full-scale.
2
Auto-Offset
The X and Y channel output offsets are turned on and set to levels giving zero X and
Y channel outputs. Any changes in the input signal then appear as changes about zero
in the outputs.
Output expansion control
Expands X and/or Y channel outputs by a factor of 10. Changes bar-graphs, CH1 and
CH2 outputs full-scale to ±1000% if X or Y selected. The value of n has the
following significance:
n Expand mode
0 Off
1 Expand X
2 Expand Y
3 Expand X and Y