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Appendix F, ALPHABETICAL LISTING OF COMMANDS
IMODE [n]
IPLOCK
IPUNLOCK
LEN [n]
LF [n
LOCK
LR[.]
F-14
Current/Voltage mode input selector
The value of n sets the input mode according to the following table
n
Input mode
0
Current mode off - voltage mode input enabled
1
High bandwidth current mode enabled - connect signal to B/I input connector
2
Low noise current mode enabled - connect signal to B/I input connector
If n = 0 then the input configuration is determined by the VMODE command.
If n > 0 then current mode is enabled irrespective of the VMODE setting.
Restrict Ethernet Access
When this command is sent via the Ethernet interface, subsequent connection
requests and hence commands will only be accepted if sent from the same IP address,
preventing unauthorized access to the instrument.
Remove Ethernet Access Restrictions
When this command is sent via the Ethernet interface, subsequent connection
requests and hence commands will be accepted from any computer on the same
network as the instrument.
Curve length control
The value of n sets the curve buffer length in effect for data acquisition. In fast curve
buffer mode the maximum allowed value is 100,000; in standard mode it depends on
the number of curves requested using the CBD command, and a parameter error
results if the value given is too large. For this reason, in standard mode if the number
of points is to be increased and the number of curves to be stored is to be reduced
using the CBD command, then the CBD command should be issued first.
n
]
Signal channel line frequency rejection filter control
1
2
The LF command sets the mode and frequency of the line frequency rejection
(notch) filter according to the following tables:
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)
System lock control
Updates all frequency-dependent gain and phase correction parameters.
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
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