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Appendix F, ALPHABETICAL LISTING OF COMMANDS
FMFILTER [n]
FMSPANF [n][.] Oscillator frequency modulation span frequency command
FMVSPAN [n][.] Oscillator frequency modulation voltage span command
FRQ[.]
FSTART[.] [n]
FSTEP[.] [n
F-12
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.
In fixed point mode n sets the oscillator frequency modulation span frequency in
mHz. The range of n is 0 to 150,000,000 representing 0 to 75 kHz; in floating point
mode n sets the span 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.
The value of n sets the oscillator frequency modulation span voltage; in fixed point
mode n is an integer in the range 0 to +10000, corresponding to a range from
0.000 V to 10.000 V, and in floating point mode it is in volts.
NOTE: The span voltage plus the center voltage cannot exceed
Reference frequency meter
If the lock-in amplifier is in the external reference source modes, the FRQ command
causes the lock-in amplifier to respond with 0 if the reference channel is unlocked, or
with the reference input frequency if it is locked.
If the lock-in amplifier is in the internal reference source mode, it responds with the
frequency of the internal oscillator.
In fixed point mode the frequency is in mHz, and in floating point mode the
frequency is in Hz.
Oscillator frequency sweep start frequency
Sets the start frequency for a subsequent sweep of the internal oscillator frequency,
in the range 0 to 150 kHz.
In fixed point mode, n is in millihertz, and in floating point mode n is in hertz.
n
]
Oscillator frequency sweep step size and type
1
2
The frequency may be swept either linearly or logarithmically, as specified by
parameter n
. The step size is specified by parameter n
2
Log sweep n
= 0
2
In fixed point mode, n
In floating point mode n
Linear sweep n
= 1
2
In fixed point mode, n
In floating point mode n
Linear seek sweep n
= 2
2
In fixed point mode, n
In floating point mode n
The seek sweep mode automatically stops when the signal magnitude exceeds
50% of full scale. This mode is most commonly used when setting up the virtual
reference mode.
is the step size in thousandths of a percent.
1
is in percent. The range of n
1
is the step size in millihertz.
1
is in hertz. The range of n
1
is the step size in millihertz.
1
is in hertz. The range of n
1
10.000 V
.
1
is 0 to 100.000%
1
is 0 to 150 kHz
1
is 0 to 150 kHz
1
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