Ametek 7124 Instruction Manual page 215

FSTOP[.] [n] Oscillator frequency sweep stop frequency
Sets the stop frequency for a subsequent sweep of the internal oscillator frequency,
in the range 0 to 150 kHz.
In fixed point mode, n is in millihertz and in floating point mode n is in hertz.
HC Halt curve acquisition
Halts curve acquisition in progress. It is effective during both single (data acquisition
initiated by TD command) and continuous (data acquisition initiated by TDC
command) curve acquisitions. The curve may be restarted by means of the TD, TDT
or TDC command, as appropriate. If an oscillator frequency and/or amplitude sweep
has been defined and linked to the curve buffer using the SWEEP command with a
parameter of 9, 10 or 100, then this sweep will be stopped as well.
ID Identification
Causes the lock-in amplifier to respond with the number 7124.
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:
0 INT (internal)
1 EXT (external rear panel TTLREF IN input on Main Console)
2 EXT (external front panel analog REF input on Main Console)
3 EXT (external rear panel TTLREF IN input on 7124 RCU)
4 EXT (external front panel analog REF input on 7124 RCU)
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:
0 INT (internal)
1 EXT (external rear panel TTLREF IN input on Main Console)
2 EXT (external front panel analog REF input on Main Console)
3 EXT (external rear panel TTLREF IN input on 7124 RCU)
4 EXT (external front panel analog REF input on 7124 RCU)
This command is only valid in Dual Reference mode
IE2 [n] Reference channel 2 source control, Dual Reference
In Dual Reference mode, the value of n sets the reference channel 1 source according
to the following table:
0 INT (internal)
1 EXT (external rear panel TTLREF IN input on Main Console)
2 EXT (external front panel analog REF input on Main Console)
3 EXT (external rear panel TTLREF IN input on 7124 RCU)
4 EXT (external front panel analog REF input on 7124 RCU)
This command is only valid in Dual Reference mode
Appendix F, ALPHABETICAL LISTING OF COMMANDS
F-13