Ametek 7280 Instruction Manual page 214

Appendix F, ALPHABETICAL LISTING OF COMMANDS
VMODE [n]
VRLOCK [n]
X[.]
XER
XOF [n
XY[.]
XYER
Y[.]
F-22
firmware version number is the number displayed on the Configuration menu.
Voltage input configuration
n Input configuration
0 Both inputs grounded (test mode)
1 A input only
2 -B input only
3 A-B differential mode
Note that the IMODE command takes precedence over the VMODE command.
Virtual reference mode lock
The Seek option of the frequency sweep mode must be used before issuing this
command, for which the value of n has the following significance:
n Mode
0 Disables virtual reference mode
1 Enters virtual reference mode by enabling tracking of the signal frequency
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.
X channel output - enhanced resolution
This command, which is only active when the X channel × 10 output expansion is
turned ON, causes the lock-in amplifier to respond with the X demodulator output in
the range ±300000, full-scale being ±100000. No floating-point version of the
command is available.
[n ]] X channel output offset control
1 2
n Selection
1
0 Disables offset
1 Enables offset facility
The range of n is ±30000 corresponding to ±300% full-scale.
2
X, Y channel outputs
Equivalent to the compound command X[.];Y[.]
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.
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