Ametek 7280 Instruction Manual page 153

XY[.] X, Y channel outputs
Equivalent to the compound command X[.];Y[.]
XYER X, Y channel outputs - enhanced resolution
Equivalent to the compound command XER;YER. Active only when both X and Y
× 10 output expansion is turned ON.
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 +1.000E-4 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
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/ADC1). 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 channel output, expressed in volt/√Hz or amps/√Hz
referred to the input. This measurement assumes that the Y channel output is
Gaussian with zero mean. (Section 3.3.16). The command is only available in
floating point mode.
ENBW[.] Equivalent noise bandwidth
In fixed point mode, reports the equivalent noise bandwidth of the output low-pass
filters at the current time constant setting in microhertz.
Chapter 6, COMPUTER OPERATION
6-19