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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.
6.7.05 Instrument Outputs
X[.]
X channel output
In fixed point mode causes the lock-in amplifier to respond with the X demodulator
output in the range ±30000, full-scale being ±10000.
In floating point mode causes the lock-in amplifier to respond with the X
demodulator output in volts or amps.
Y[.]
Y channel output
In fixed point mode causes the lock-in amplifier to respond with the Y demodulator
output in the range ±30000, full-scale being ±10000.
In floating point mode causes the lock-in amplifier to respond with the Y
demodulator output in volts or amps.
XY[.]
X, Y channel outputs
Equivalent to the compound command X[.];Y[.]
MAG[.]
Magnitude
In fixed point mode causes the lock-in amplifier to respond with the magnitude value
in the range 0 to 30000, full-scale being 10000.
In floating point mode causes the lock-in amplifier to respond with the magnitude
value in the range +3.000E0 to +0.001E-9 volts or +3.000E-6 to +0.001E-15 amps.
PHA[.]
Signal phase
In fixed point mode causes the lock-in amplifier to respond with the signal phase in
centidegrees, in the range ±18000.
In floating point mode causes the lock-in amplifier to respond with the signal phase
in degrees.
MP[.]
Magnitude, phase
Equivalent to the compound command MAG[.];PHA[.]
RT[.]
Ratio output
In integer mode the RT command reports a number equivalent to 1000×X/ADC1
where X is the value that would be returned by the X command and ADC1 is the
value that would be returned by the ADC1 command.
In floating point mode the RT. command reports a number equivalent to X/ADC1.
LR[.]
Log Ratio output
In integer mode, the LR command reports a number equivalent to
1000×log(X/ADC1) where X is the value that would be returned by the X command
Chapter 6, COMPUTER OPERATION
6-17
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