Nplc Caching - Keithley SourceMeter 2400 User Manual
Sourcemeter 2400 series source measure unit
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Also See for SourceMeter 2400:
- Service manual (137 pages) ,
- Quick start manual (46 pages) ,
- Quick results manual (53 pages)
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3-10
Basic Source-Measure Operation
NPLC caching
NPLC caching speeds up source memory sweeps by caching A/D reference and zero val-
ues. When NPLC caching is enabled (using the NPLC-CACHE/ENABLE menu selec-
tion), the A/D reference and zero values will be saved for up to the 10 most recent voltage,
current, and resistance measurement functions settings. Whenever the integration rate is
changed via the SPEED key, a recalled user setup (using the SAVESETUP/RESTORE
menu selection), or during a source memory recall (either with the SOURCE-MEMORY/
RESTORE menu 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.
NOTE
Auto zero should be disabled for maximum source memory sweep speed; other-
wise 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 select AUTO-ZERO/ONCE in the A/D-CTRL menu to
force an immediate auto zero update.
NPLC cache setup
Follow the steps below to enable and use NPLC caching with a source memory sweep:
1.
Press the MENU key, select A/D-CTRL, then press ENTER.
2.
Select AUTO-ZERO, then press ENTER.
3.
Choose DISABLE, then press ENTER to disable auto zero.
4.
From the A/D CONTROLS menu, select NPLC-CACHE, then press ENTER.
5.
Select ENABLE, then press ENTER to enable NPLC caching.
6.
Use the EXIT key to back out of the main menu structure.
7.
Set up the source memory parameters, and run the source memory sweep. (See
Section
10,
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
2400 Series SourceMeter
"Performing a source memory
sweep.")
®
User's Manual
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