Series 2600B System SourceMeter® instrument Reference Manual Section 2: Sourcing and measuring
2600BS-901-01 Rev. F/August 2021 2-9
Setting autozero from a remote interface
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 (see smuX.measure.autozero (on page 9-218)). For example, send the
following command to activate channel A automatic reference measurements:
smua.measure.autozero = smua.AUTOZERO_AUTO
Autozero command and options
smuX.measure.autozero = smuX.AUTOZERO_OFF
Disable autozero. Old NPLC cache values are
used when autozero is disabled (see NPLC
caching (on page 2-9)).
smuX.measure.autozero = smuX.AUTOZERO_ONCE
After immediately making one reference and
one zero measurement, turns automatic
reference measurements off.
smuX.measure.autozero = smuX.AUTOZERO_AUTO
Automatically makes new reference and zero
measurements when the 2600B determines
values are out-of-date.
* smuX can be smua for channel A or smub for channel B
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.
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