IBM 7220 Instruction Manual page 93

XY[.] X, Y 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 / ADC 1.
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
and ADC1 is the value that would be returned by the ADC1 command. The response
range is -3000 to +2079.
In floating point mode, the LR. command reports a number equivalent to
log (X / ADC 1). The response range is -3.000 to +2.079.
NHZ.
Causes the lock-in amplifier to respond with the square root of the noise spectral
density measured at the Y output, expressed in volt/√Hz or amp/√Hz referred to the
input. This measurement assumes that the Y output is Gaussian with zero mean.
(Section 3.10). The command is only available in floating point mode.
This command is not available when the reference frequency exceeds 60 kHz.
Chapter 6, COMPUTER OPERATION
6-17