Ametek 7124 Instruction Manual page 213

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
FASTMODE [n] Output Filter Mode Control
The value of n sets the output filter mode control according to the following table:
n Function
0 Fast mode off
1 Fast mode on
When the fast analog output mode is turned off, the available output filter time
constant is restricted to 5 ms or greater, but all four filter slopes are available (i.e. 6,
12, 18 and 24 dB/octave). Conversely, when the mode is turned on, time constants
down to 10 µs can be selected, but the slope is limited to either 6 or 12 dB/octave.
FET [n] ] FET input selection
The value of n control the input device used at the signal input on the 7124 RCU
according to the following table:
n Input device
0 Bipolar
1 FET
FIBER] Fiber calibration
When this command is sent, the instrument performs an automatic fiber calibration
routine, by correcting the oscillator and signal channel amplitude and phase errors
caused by variability in the fiber optic connector losses.
FLOAT [n] Input connector shield float/ground control
n Selection
0 Ground
1 Float (connected to ground via a 1 k resistor)
FMCENTERF [n][.]
In fixed point mode n sets the oscillator frequency modulation center frequency in
mHz. The range of n is 0 to 150000000 representing 0 to 150.0 kHz; in floating point
mode n sets the center frequency in Hz. The range of n is 0 to 1.5E5
NOTE: The span frequency plus the center frequency cannot exceed 150.0kHz;
the center frequency must also be greater than the span frequency.
FMCENTERV [n][.]
The value of n sets the oscillator frequency modulation center voltage; in fixed point
mode n is an integer in the range -10000 to +10000, corresponding to voltages from -
10.000 V to +10.000 V, and in floating point mode it is in volts.
NOTE: The span voltage plus the center voltage cannot exceed
Appendix F, ALPHABETICAL LISTING OF COMMANDS
Oscillator frequency modulation center frequency command
Oscillator frequency modulation center voltage command

10.000 V
F-11