SCPI Command Reference 17-93
Following these general steps to program and use NPLC caching:
1. Send this command to disable auto zero: SYST:AZER OFF.
2. Enable NPLC caching by sending: SYST:AZER:CACH ON.
3. Set up and run your source memory sweep with the :SOUR:MEM com-
mands along with the various other commands required to program
additional operating modes. (See Configure memory sweep as well as
other pertinent command descriptions in this section for details.)
NOTE Auto zero should be disabled with the :SYST:AZER OFF command for maximum
source memory sweep speed; otherwise, the cache is of little use. With auto zero
enabled, new A/D reference and zero values are taken for every reading and saved
into the cache, slowing down sweep operation. However, with auto zero disabled,
measurements may drift and become erroneous. To minimize drift when using NPLC
caching with auto zero disabled, periodically send :SYST:AZER ONCE to force an
immediate auto zero update.
Select power line frequency setting
:LFRequency <freq>
:SYSTem:LFRequency <freq> Select line frequency
Parameters <freq> = 50 50Hz or 400Hz setting
60 60Hz setting
Query :LFRequency? Query line frequency selection.
Description Use this command to manually select the line frequency setting (50 or
60Hz). For 400Hz operation, select 50Hz.
:AUTO <b>
:SYSTem:LFRequency:AUTO <b> Control auto line frequency selection
Parameters <b> = 1 or ON Enable and line frequency selection
0 or OFF Disable auto line frequency selection
Query :AUTO? Query state of auto line frequency selection.
Description This command is used to enable or disable auto line frequency detection.
When enabled, the SourceMeter will sense the line frequency on power-up
and select the appropriate line frequency setting.
Manually setting the line frequency disables auto frequency. See the previ-
ous command.
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