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n
Slope
0
6 dB/octave
1
12 dB/octave
SRATE[.] [n]
Oscillator frequency and amplitude sweep step rate
In fixed point mode, sets the sweep rate in milliseconds per step, and in floating
point mode sets the rate in seconds. The range of n is 1 to 1000000 (1 ms to 1000 s)
ST
Report status byte
Causes the lock-in amplifier to respond with the status byte, an integer between 0
and 255, which is the decimal equivalent of a binary number with the following bit-
significance:
Bit 0
Command complete
Bit 1
Invalid command
Bit 2
Command parameter error
Bit 3
Reference unlock
Bit 4
Output overload - read overload byte to determine location
Bit 5
New ADC values available after external trigger
Bit 6
Input overload
Bit 7
Data available
STR [n]
Storage interval control
Sets the time interval between successive points being acquired into the curve buffer.
n specifies the time interval in microseconds with a resolution of 1 µs. In fast curve
buffer mode, the shortest time that can be specified is 1 µs; in standard mode it is
1000 µs, or 1 ms
SWEEP [n]
Oscillator frequency and amplitude sweep control
n
Sweep status
0
Stop
1
Start/continue frequency sweep
2
Start/continue amplitude sweep
3
Start/continue frequency sweep and amplitude sweep
5
Pause frequency sweep
6
Pause amplitude sweep
7
Pause frequency sweep and amplitude sweep
9
Link frequency sweep to curve buffer acquisition
10 Link amplitude sweep to curve buffer acquisition
11 Link frequency and amplitude sweep to curve buffer acquisition
This command is used to start or stop the internal oscillator frequency or amplitude
sweep, or to specify that the sweep should be linked to the curve buffer data
acquisition.
In the normal mode, when a frequency and/or amplitude sweep has been defined,
applying SWEEP with a parameter of 1, 2, or 3 will start it. The sweep can be paused
using the command with the correct value of n for the sweep in progress. For
example, if a frequency sweep is started using SWEEP 1 then it can only be paused
by sending SWEEP 5. Similarly, it can only be continued by sending SWEEP 1. The
command SWEEP 0 will, however, stop either or both types of sweep.
When n is equal to 9, 10 or 11 the instrument is set to link the oscillator frequency
Appendix E, ALPHABETICAL LISTING OF COMMANDS
E-21
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