Maximum Source Values And Readings; Measure Auto Delay; Ranging Limitations; Manual Ranging - Keithley 2601B Reference Manual

Series 2600B System SourceMeter® Instrument Reference Manual

Maximum source values and readings

The full-scale output for each voltage and current source range is 101 percent of the selected range,
but the full-scale measurement is 102 percent of the range. For example, ±1.01 A is the full-scale
source value for the 1 A range, and ±102 mA is the full-scale reading for the 100 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.

Measure auto delay

The measure delay is a specific delay that is applied before each measurement is taken. This delay is
disabled by default (measurements are taken immediately). You can change the default delay by
setting the
delay setting (set smuX.measure.delay = smuX.DELAY_AUTO). If the measure delay is set to the
auto delay setting, a range-dependent delay is applied each time the instrument performs a current
measurement. This delay also happens for the measurement that is taken after changing current
ranges during an autoranged measurement. The default measurement delay varies by model.
You can increase or decrease the auto delay by changing the delay factor (for example, to reduce the
delay across all ranges by half, set smuX.measure.delayfactor = 0.5). For additional
information, refer to

Ranging limitations

If the source and measure functions are different (such as source V and measure I, or source I and
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. In addition, there are other
limitations.
•
Model 2601B/2602B/2604B: With the 40 V V-Source range selected, the highest current
measurement range is 1 A. With the 3 A I-Source range selected, the highest voltage
measurement range is 6 V. Refer to
information.
•
Model 2611B/2612B/2614B/2634B/2635B/2636B: With the 200 V V-Source range selected, the
highest current measurement range is 100 mA. With I-Source ranges above 100 mA selected, the
highest voltage measurement range is 20 V. Refer to
power derating information.

Manual ranging

Use the range keys,
•
To set the source range, press the SRC key, and then use the RANGE keys to set the range.
•
To set the measure range, select the single-channel display mode (Models
2602B/2604B/2612B/2614B/2634B/2636B), and then use the RANGE keys to set the range.
If the instrument displays the overflow message on a particular range, select a higher range until an
on-range reading is displayed. To ensure the best accuracy and resolution, use the lowest range
possible that does not cause an overflow.
2600BS-901-01 Rev. B / May 2013
smuX.measure.delay (on page 7-202) attribute either to a specific value or to an auto
smuX.measure.delayfactor
and , to select a fixed range:
(on page 7-203) in the "Remote commands" section.
Operating boundaries (on page 4-4) for power derating
Operating boundaries
Section 2: General operation
(on page 4-4) for
2-83