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n
Selection
1
0
Off
1
Enable 50 or 60 Hz notch filter
2
Enable 100 or 120 Hz notch filter
3
Enable both filters
n
Notch Filter Center Frequencies
2
0
60 Hz (and/or 120 Hz)
1
50 Hz (and/or 100 Hz)
LOCK
System lock control
Updates all frequency-dependent gain and phase correction parameters.
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
LTS [n]
Display on/off control
The value of n controls the front panel LCD display according to the following table:
n
Selection
0
Display off
1
Normal operation
M
Curve acquisition status monitor
Causes the lock-in amplifier to respond with four values that provide information
concerning data acquisition, as follows:
First value, Curve Acquisition Status: a number with five possible values, defined
by the following table:
First Value Significance
0
No curve activity in progress.
1
Acquisition via TD command in progress and running.
2
Acquisition via TDC command in progress and running.
5
Acquisition via TD command in progress but halted by HC
command.
6
Acquisition via TDC command in progress but halted by
HC command.
Second value, Number of Sweeps Acquired: This number is incremented each
time a TD is completed and each time a full cycle is completed on a TDC
acquisition. It is zeroed by the NC command and also whenever a CBD or LEN
command is applied without parameters.
Third value, Status Byte: The same as the response to the ST command. The
number returned is the decimal equivalent of the status byte and refers to the
previously applied command.
Fourth value, Number of Points Acquired: This number is incremented each time
Appendix E, ALPHABETICAL LISTING OF COMMANDS
E-15
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