Operation Considerations - Keithley SourceMeter 2400 User Manual

®
2400 Series SourceMeter User's Manual

Operation considerations

The following paragraphs discuss warm-up period, auto zero, V-source protection, and
source delay.
Warm-up
The SourceMeter must be turned on and allowed to warm up for at least one hour to
achieve rated accuracies. See
Auto zero
Every A/D conversion (reading) is calculated from a series of zero, reference, and signal
measurements. With auto zero enabled, all three of these measurements are performed for
each reading to achieve rated accuracy. With auto zero disabled, zero and reference are not
measured. This increases measurement speed, but zero drift will eventually corrupt accu-
racy. With auto zero disabled, periodically change measurement speed.
Temperature changes across components within the instrument can cause the reference
and zero values for the A/D converter to drift due to thermo-electric effects. Auto zero acts
to negate the effects of drift in order to maintain measurement accuracy over time. Without
auto zero enabled, measurements can drift and become erroneous.
Front panel auto zero
Set the auto zero from the front panel as follows:
1. Press the MENU key.
2. Select A/D CTRL from the main menu, then press ENTER.
3. Select AUTO ZERO, then press ENTER.
4. Select ENABLE or DISABLE as appropriate, then press ENTER.
5. Press EXIT as necessary to return to normal display.
Remote command auto zero
Use the :SYSTem:AZERo command to enable or disable auto zero via remote. See
Section 18, "SYSTem
auto zero:
:SYST:AZER ON
Conversely, send this command to disable auto-zero:
:SYST:AZER OFF
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Basic Source-Measure Operation
Appendix A for specifications.
subsystem." For example, send the following command to disable
3-9