Ametek 7230 Instruction Manual page 149

EVENT [n] Event marker control
During a curve acquisition into the standard curve buffer, if bit 13 in the CBD
command has been asserted, the lock-in amplifier stores the value of the Event
variable at each sample point. This can be used as a marker indicating the point at
which an experimental parameter was changed. The EVENT command is used to set
this variable to any value between 0 and 32767.
EX [n] Output expansion control
Expands X and/or Y channel outputs by a factor of 10. This changes the analog
outputs full-scale to ±10% 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 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 120000000 or 250000000 representing 0 to 120.0 or
250.0 kHz; in floating point mode n sets the center frequency in the range 0 to 1.2E5
or 2.5E5
Note: The span frequency plus the center frequency cannot exceed 120.0 or
250.0kHz; the center frequency must also be greater than the span frequency.
Appendix E, ALPHABETICAL LISTING OF COMMANDS
Oscillator frequency modulation center frequency command
E-11