Trigger Level Range - Keithley 2302 Instruction Manual

Integration time
For the pulse current step method, the integration time is required to be at least 400μsec less
than the step duration. This 400μsec allows for the Model 2306 to complete the previous
measurement conversion and become ready for the next pulse edge. With this in mind,
6 lists appropriate integration times. Integration time applies to all active steps when step
measurements are requested — each step has the same integration time.
Table 3-6
Sample integration times
Pulse step duration
3.8ms
1.25ms
800μsec
500μsec

Trigger level range

Select an appropriate trigger level range for the desired measurements. For the Models 2306,
2306-VS, and 2306-PJ (5A current range), three trigger level ranges are available: 5 amps, 1 amp
and 100 milliamps. For the Model 2306-PJ, the step readings can also be taken on the 500mA
current range which adds the 500mA, 100mA, and 10mA trigger level ranges. Make sure all
TLEV values are valid in the selected trigger level range. There is only one trigger level range
for all active steps — each step does not have a unique trigger level range.
Changing ranges
When changing ranges, the currently active TLEV (trigger level) step values are checked.
This check verifies that the new range maximum setting does not exceed the range (i.e., 5A for
5A range, 1A for 1A range, or 100mA for 100mA range). If just one of the active step TLEV
values exceeds the maximum setting for the new range, then all step TLEV values are set to 0A.
For example: When changing from the 5 amp range to the 1 amp range, a TLEV greater than
1 amp zero's out all active trigger level values. On the other hand, if changing from the 5 amp
range to the 1 amp range and no trigger level settings exceed 1 amp, the previous settings will
be used for the 1 amp range.
NOTE
Programming examples
The following programming examples apply to the Models 2306, 2306-VS, and 2306-PJ on
the 5A current range. To modify the examples to apply to the 500mA current range
(Model 2306-PJ only):
1.
2.
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Step integration times
≤ 3.4ms
≤ 0.85ms
≤ 400μsec
≤ 100μsec
Change TLEV settings for each step using the :STEP:TLEVx command.
Change the SENS:CURR:RANG command line to select the 500mA current range.
Change the trigger level commands to appropriate commands for the 500mA current
range. In the examples, the command lines requiring this modification are italicized.
Pulse Current Measurements 3-29
Table 3-