18-110 SCPI Command Reference 2400 Series SourceMeter
®
User’s Manual
Control auto zero
STATe <name>
:SYSTem:AZERo:STATe <name> Control auto zero
Parameters <name> = ON Enable auto zero
OFF Disable auto zero
ONCE Force immediate auto zero update
Query :STATe? Query state of auto zero
Description This command is used to enable or disable auto zero, or to force an
immediate one-time auto zero update if auto zero is disabled. When auto
zero is enabled, accuracy is optimized. When auto zero is disabled,
speed is increased at the expense of accuracy.
Control NPLC caching
CACHing
:SYSTem:AZERo:CACHing[:STATe] <b> Enable/disable NPLC caching
:SYSTem:AZERo:CACHing:REFResh Update NPLC cache values
:SYSTem:AZERo:CACHing:RESet Clear NPLC values from cache
:SYSTem:AZERo:CACHing:NPLCycles? Return list of NPLC values
Parameters <b> = 1 or ON Enable NPLC caching
0 or OFF Disable NPLC caching
Query [:STATe]? Query state of NPLC caching
:NPLCycles? Return list of NPLC values stored in cache
from oldest to newest.
Description NPLC caching speeds up source memory sweeps by caching A/D refer-
ence and zero values. When SYST:AZER:CACH is enabled, the A/D
reference and zero values will be saved for up to the 10 most recent
[:SENSe[1 ]]:VOLTage[:DC]:NPLCycles, [:SENSe[1] ]:CURRent[:
DC]:NPLCycles, or [:SENSe[1]]:RESistance:NPLCycles settings.
Whenever the integration rate is changed via an NPLC command, user
setup recall (*RCL), or a source memory recall (:SOUR:MEM com-
mand or during a source memory sweep), NPLC caching will occur. If
the integration rate is already stored in the cache, the stored reference
and zero values are recalled and used. Otherwise, a reference and zero
value are acquired and stored in the cache. If there are already 10 NPLC
values stored, the oldest one will be overwritten by the newest one.
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