Tektronix Keithley 2651A Reference Manual page 98

Model 2651A High Power System SourceMeter® Instrument Reference Manual
Measure autodelay
The measure delay is a specific delay that is applied before each measurement is made. This delay is
disabled by default (measurements are made immediately). You can change the default delay by
setting the smuX.measure.delay
setting (set smua.measure.delay = smua.DELAY_AUTO). If the measure delay is set to the
autodelay setting, a range-dependent delay is applied each time the instrument performs a current
measurement. This delay also happens for the measurement that is made after changing current
ranges during an autoranged measurement. The following table contains the measure autodelays
associated with each current range.
Range
10 mA (and above)
1 mA
100 µA
10 µA
1 µA
100 nA
You can increase or decrease the autodelay by changing the delay factor (for example, to reduce the
delay across all ranges by half, set smua.measure.delayfactor = 0.5). For additional information,
refer to smuX.measure.delayfactor
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.
The maximum output power and source/sink limit for the Model 2651A is 202 W per channel
(maximum). With the 40 V (V-Source) range selected, the highest current measurement range is 5 A.
Refer to Operating boundaries
A I-Source range selected, you can be at a larger voltage range than 4 V dependent on your duty
cycle. See Pulse duty cycle
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, press the MEAS key, and then use the RANGE keys to set the range.
2651A-901-01 Rev. C October 2021
(on page 7-248) attribute either to a specific value or to an autodelay
Measure autodelay
0 µs (no delay)
100 µs
150 µs
500 µs
2.5 ms
15 ms
(on page 7-249).
(on page 4-5) for power derating information. When pulsing with the 50
(on page 3-30) for details.
and , to select a fixed range:
Section 2: General operation
2-73