10-8
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6482-901-01 Rev. A / August 2012
Section 10: Limit Testing
Model 6482 Dual-Channel Picoammeter / Voltage Source Reference Manual
Limit test programming example
Diode current test is an example that readily lends itself to pass or fail analysis. This test verifies
the forward currents at various voltages. The test is performed by sourcing a specified voltage
level and then measuring the current. The current is then compared with one set of limits to
determine if the diode passes or fails and should be discarded. A marginal diode, determined by a
second set of narrower limits, can be sent to Q/A for further analysis.
Test parameters for this test include:
•
Source and measure channel: channel 1
•
Source voltage: 1 V
•
Source delay: 100 ms
•
Limit 3 upper value: 10 mA
•
Limit 3 lower value: 4 mA
•
Limit 4 upper value: 8 mA
•
Limit 4 lower value: 6 mA
summarizes the basic SCPI command sequence for performing a limit test for the diode
current test.
NOTE
See
for a complete program listing that includes additional programming
steps necessary to test the values returned by the :CALC7:LIM3:FAIL? and
:CALC7:LIM4:FAIL? queries.
Table 10-2
Limits test programming example
Command
Description
*RST
:SENS1:CURR:RANG:AUTO ON
:SOUR1:VOLT:TRIG 1
:SOUR1:DEL 0.1
:CALC7:FEED CALC3
:CALC7:LIM3:UPP 10e-3
:CALC7:LIM3:LOW 4e-3
:CALC7:LIM4:UPP 8e-3
:CALC7:LIM4:LOW 6e-3
:CALC7:LIM1:STAT 0
:CALC7:LIM3:STAT 1
:CALC7:LIM4:STAT 1
:OUTP1 ON
:INIT
:OUTP1 OFF
:CALC7:LIM3:FAIL?
:CALC7:LIM4:FAIL?
Restore GPIB default conditions.
Turn on channel 1 measure autorange.
Output 1 V on channel 1 when triggered.
100 ms source delay.
Use CALC3 (Channel 1) data for limits comparison.
Limit 3 upper value = 10 mA.
Limit 3 lower value = 4 mA.
Limit 4 upper value = 8 mA
Limit 4 lower value = 6 mA.
Turn off Limit 1 test.
Turn on Limit 3 test.
Turn on Limit 4 test.
Turn on channel 1 source output.
Trigger reading and limits test.
Turn off output.
Query Limit 3 test results (1 = discard diode).
Query Limit 4 test results (1 = send diode to QA).
Summary of Contents for 6482
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