Ametek 7270 Instruction Manual page 203

Dsp lock-in amplifier
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EX [n]
Output expansion control
Expands X and/or Y channel outputs by a factor of 10. Changes bar-graphs, analog
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
FET [n] ]
FET input selection
The value of n control the input device used at the signal input according to the
following table:
n
Input device
0
Bipolar
1
FET
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 250000000 representing 0 to 250.0 kHz; in floating point
mode n sets the center frequency in Hz. The range of n is 0 to 2.5E5
NOTE: The span frequency plus the center frequency cannot exceed 250.0kHz;
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
FMFILTER [n]
Oscillator frequency modulation filter control command
The value of n sets the oscillator frequency modulation voltage low-pass filter
control in the range 0 to 10. The value of 0 gives the widest bandwidth for this filter,
with the value of 10 the lowest.
FMSPANF[.] [n] Oscillator frequency modulation span frequency command
In fixed point mode n sets the oscillator frequency-modulation span frequency in
Appendix E, ALPHABETICAL LISTING OF COMMANDS
Oscillator frequency modulation center frequency command
Oscillator frequency modulation center voltage command
10.000 V
E-11

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