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Appendix F, ALPHABETICAL LISTING OF COMMANDS
SYNC [n]
TADC [n]
TC [n]
TC.
F-22
n
Sweep status
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
and/or amplitude sweeps to the curve buffer. The SWEEP command continues to
function as a write/read command except when the curve buffer acquisition is
actually running. In such cases, the SWEEP command changes to read-only and will
only report values of 9, 10 or 11, indicating what type of linking is active. The sweep
can then only be stopped by stopping the curve buffer, using the HC command.
However, the user can still determine the progress of the sweep using the curve
buffer monitor "M" command and the OF and/or OA (oscillator frequency and
amplitude) commands.
Synchronous time constant control
n
Effect
0
Synchronous time constant disabled
1
Synchronous time constant enabled
Auxiliary analog-to-digital input trigger mode
The value of n sets the trigger modes for the auxiliary ADC inputs according to the
following table:
n
Trigger Mode
0
Internal (1 kHz)
1
External - apply trigger to ADC TRIG IN connector
2
Burst ADC1 (5 µs per point, only ADC1 is converted)
3
Burst ADC1 & ADC2
Filter time constant control
The value of n sets the output filter time constant in accordance with the following
table:
NOISEMODE
= 0
n
time constant
0
10 µs
1
20 µs
2
50 µs
3
100 µs
4
200 µs
NOISEMODE
= 1
time constant
n
N/A
16
N/A
17
N/A
18
N/A
19
N/A
20
NOISEMODE
NOISEMODE
= 0
= 1
time constant
time constant
2 s
N/A
5 s
N/A
10 s
N/A
20 s
N/A
50 s
N/A
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