Keithley SourceMeter 2600 Series Reference Manual page 179

Series 2600 System SourceMeters Reference Manual
Maximum source values and readings
The full scale output for each voltage and current source range is 101% of the
selected range, while the full scale measurement is 102% of the range. For
example, ±1.01A is the full scale source value for the 1A range, and ±102mA is
the full scale reading for the 100mA measurement range. Input levels that exceed
the maximum levels cause the overflow message to be displayed. Note, however,
that the instrument will auto range at 100% of the range.
Ranging limitations
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Manual ranging
The RANGE
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If the instrument displays the overflow message on a particular range, select a
higher range until an on-range reading is displayed. Use the lowest range possi-
ble without causing an overflow to ensure best accuracy and resolution.
Auto ranging
To use auto source ranging, press SRC then AUTO RANGE. To use auto mea-
sure ranging, select the Model 2602/2612 single-channel display mode, then
press MEAS followed by AUTO RANGE. The AUTO annunciator turns on when
source or measure auto ranging is selected. With auto ranging selected, the
instrument automatically chooses the best range to source or measure the
applied signal. The instrument will auto range at 100% of range.
Note that source auto ranging will turn off when editing the source value.
Model 2601/2602: With the 40V V-Source range selected, the highest
current measurement range is 1A. With the 3A I-Source range selected, the
highest voltage measurement range is 6V.
Model 2611/2612: With the 200V V-Source range selected, the highest
current measurement range is 100mA. With I-Source ranges above 100mA
selected, the highest voltage measurement range is 20V.
For Source V Measure I or Source I Measure V, you can set source and
measure ranges separately. If both source and measure functions are the
same, the measure range is locked to the source range.
and keys are used to select a fixed range:
To set source range, press SRC, then use the RANGE keys to set the
range.
To set measure range, select the single-channel display mode (Model
2602/2612 only), press MEAS, then set the range with the RANGE keys
(Source V Measure I, or Source I Measure V).
Return to
Range, Digits, Speed, Rel, and Filters
Section 6 topics 2600S-901-01 Rev. A / May 2006
6-3