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Section 2: General operation
Model 2657A High Power System SourceMeter® Instrument Reference Manual
2-72
2657A-901-01 Rev. B/December 2012
Displayed error and status messages
During operation and programming, front-panel messages may be briefly displayed. Typical
messages are either status or error notifications (refer to the
(on page 8-3) for a
complete list of these messages and their meanings).
Status and error messages are held in a queue. For information about retrieving messages from
queues, refer to
). For information on error messages, refer to the
(on page
Range
The selected measurement range affects the accuracy of the measurements and the maximum signal
that can be measured. If the range is changed, the display may contain dashes instead of a reading
(for example, --.---- mA). This indicates that no measurement was taken using the range that is
presently selected. To update the displayed reading, trigger a measurement (if in local control, press
the TRIG key).
Available ranges
The following table lists the available source and measurement ranges for the Keithley Instruments
Model 2657A High Power System SourceMeter
®
instrument.
Model 2657A source and measurement ranges*
Voltage ranges
Current ranges
200 V
1 nA
500 V
10 nA
1500 V
100 nA
3000 V
1
μ
A
10
μ
A
100
μ
A
1
mA
2
mA
20
mA
120
mA
* Refer to
(on page 4-4) for power derating
information.
Maximum source values and readings
The full-scale output for each voltage and current source range is 101 percent of the selected range.
The full-scale measurement is also 101 percent of the range. For example, ±1.01 mA is the full-scale
source value for the 1 mA range, and ±20.2 mA is the full-scale reading for the 20 mA measurement
range. Input levels that exceed the maximum levels cause the overflow message to be displayed.
Note, however, that the instrument will autorange at 100 percent of the range.
Quick Tip
Содержание 2657A
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