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Chapter 4
Example
SCNAMPATTN 1
SCNAMPATTN?
SCNDCATTN(?) {i}
The
SCNDCATTN i
scanning dc level to automatic (i=0) or fixed (i=1).
Normally, the sine out dc level hardware will automatically switch one or more balanced
attenuators into the dc level signal path to optimize performace for the commanded level.
During scans, however, it can be helpful to force the attenuators to remain in a fixed
configuration, inhibiting the relay switching that would otherwise introduce transients in
the sine output.
Example
SCNDCATTN 1
SCNDCATTN?
SCNINRVL(?) {i}
The
SCNINRVL i
below.
The parameter update interval is the approximate time spent at each scan step along the
way during a scan.
Example
SCNINRVL 8
SCNINRVL?
SCNENBL(?) { OFF | ON | i }
The
SCNENBL i
parameter to its begin value but does not start a scan.
Example
SCNENBL ON
Set the scan amplitude attenuator mode to fixed
Returns the mode for amplitude output attenuators
command sets the operating mode for the output attenuators when
Set the scan dc level attenuator mode to fixed
Returns the mode for dc level output attenuators
command sets the parameter update interval according to the table
i
Update Interval
0
8 ms
1
16 ms
2
31 ms
3
78 ms
4
155 ms
5
469 ms
6
938 ms
7
1.875 s
8
4.688 s
Set parameter update interval to 4.688 s
Returns parameter update interval index i
command turns scanning off (i=0) or on (i=1). This sets the scan
Turn scanning on
i
Update interval
9
9.375 s
10
28.12 s
11
56.25 s
12
112.5 s
13
5 m 37 s
14
11 m 15 s
15
22 m 30 s
16
45 m 00 s
SR865A DSP Lock-in Amplifier
Programming
129
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