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
(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
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.
