Model 2651A High Power System SourceMeter® Instrument Reference Manual Section 2: General operation
2651A-901-01 Rev. A / March 2011 2-65
Error and status messages
Quick Tip
During operation and programming, a number of front-panel messages are briefly displayed. Typical
messages are either status or error notifications (refer to Error summary list (on page 8-2) for a
complete list of these messages and their meanings).
Status and error messages are held in queues. For information about retrieving error messages from
queues, refer to Status Model (on page E-1).
Range
The selected measurement range affects the accuracy of the measurements as well as the maximum
signal that can be measured. Note that dashed lines are displayed (for example, --.---- µA) to indicate
that the previous measurement is not recent. This usually happens when a change such as selecting
a different range occurs.
Available ranges
The following table lists the available source and measurement ranges for the Keithley Instruments
Model 2651A High Power System SourceMeter
®
Instrument.
Model 2651A Source and measurement ranges
Voltage ranges Current ranges
100 mV 1 µA
1 V 10 µA
10 V 100 µA
20 V 1 mA
40 V 10 mA
100 mA
1 A
5 A*
10 A*
20 A*
50 A**
* Refer to Operational boundaries for power derating information.
** 50 A range accessible only in pulse mode.
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