Section 4: Sourcing and measuring Model 2601B-PULSE System SourceMeter Instrument Reference Manual
4-42 2601B-PULSE-901-01A April 2020
Remote command autozero
To set autozero from a remote interface:
Use the autozero command with the appropriate option shown in the following table to set autozero
through a remote interface. For additional detail, refer to smua.measure.autozero (on page 11-195)).
For example, send the following command to enable automatic reference measurements:
smua.measure.autozero = smua.AUTOZERO_AUTO
Autozero command and options
smua.measure.autozero = smua.AUTOZERO_OFF
Disable autozero. Old NPLC cache values are
used when autozero is disabled (see NPLC
caching (on page 4-42)).
smua.measure.autozero = smua.AUTOZERO_ONCE
After immediately taking one reference and one
zero measurement, turns automatic reference
measurements off.
smua.measure.autozero = smua.AUTOZERO_AUTO
Automatically takes new acquisitions when the
2601B-PULSE determines reference and zero
values are out-of-date.
NPLC caching
NPLC caching speeds up operation by caching A/D reference and zero values for up to the ten most
recent measurement aperture settings. Whenever the integration rate is changed using the SPEED
key, or a user setup is recalled, the NPLC cache is checked. If the integration rate is already stored in
the cache, the stored reference and zero values are recalled and used. If the integration rate is not
already stored in the cache, a reference and zero value is acquired and stored in the cache when the
next measurement is made. If there are already ten NPLC values stored, the oldest one is overwritten
by the newest one. When autozero is off, NPLC values stored in the cache are used
regardless of age.
Triggering in local mode
It is not necessary to change any trigger settings to use the basic source and measurement
procedures covered in this section.
Press the MENU key, and then select SETUP > RECALL > INTERNAL > FACTORY to reset the
factory default conditions.
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