Chapter 6, COMPUTER OPERATION
6-13
n
1
Selection
0 Off
1 Enable 50 or 60 Hz notch filter
2 Enable 100 or 120 Hz notch filter
3 Enable both filters
n
2
Notch Filter Center Frequencies
0 60 Hz (and/or 120 Hz)
1 50 Hz (and/or 100 Hz)
6.7.02 Reference Channel
REFMODE [n] Reference mode selector
The value of n sets the reference mode of the instrument according to the following
table:
n Mode
0 Single Reference / Virtual Reference mode
1 Dual Harmonic mode
2 Dual Reference mode
NOTE: When in either of the dual reference modes the command set changes to
accommodate the additional controls. These changes are detailed in section 6.7.14
IE [n] Reference channel source control (Internal/External)
In Single Reference and Dual Harmonic mode, the value of n sets the reference input
mode according to the following table:
n Selection
0 INT (internal)
1 EXT (external rear panel TTLREF IN input)
2 EXT (external front panel analog REF input)
This command is invalid in Dual Reference mode
IE1 [n] Reference channel 1 source control, Dual Reference
In Dual Reference mode, the value of n sets the reference channel 1 source according
to the following table:
n Selection
0 INT (internal)
1 EXT (external rear panel TTLREF IN input)
2 EXT (external front panel analog REF input)
This command is only valid in Dual Reference mode
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