2 Performance Verification
16 Model N6705 Service Guide
Transient Recovery Time (all except N678xA SMU and N6783A)
Test category = performance
This test measures the time for the output voltage to recover to within the
specified value following a 50% change in the load current.
1 Turn off the DC Power Analyzer and connect an oscilloscope across
the sense terminals (see Test Setup A). Connect an electronic load to
the output terminals.
2 Turn on the DC Power Analyzer and program the instrument as
described in the test record form under “Transient Response”.
3 Set the electronic load to operate in constant current mode.
Program its load current to the lower current value indicated in the
test record form under “Transient Response”.
4 Set the electronic load's transient generator frequency to 100 Hz
and its duty cycle to 50%.
5 Program the load's transient current level to the higher current value
indicated in the test record form under “Transient Response”, and
turn the transient generator on.
6 Adjust the oscilloscope for a waveform similar to that shown in the
following figure.
7 The output voltage should return to within the specified voltage at
the specified time following the 50% load change. Check both
loading and unloading transients by triggering on the positive and
negative slope. Record the voltage at time “t” in the performance
test record form under “Transient Response”.
Transient Recovery Time (N678xA SMU and N6783A only)
Test category = performance
This test measures the time for the output voltage to recover to within the
specified value following the specified change in the load current of the
specified range for models N678xA SMU and N6783A.
1 Turn off the DC Power Analyzer and connect an oscilloscope across the
sense terminals (see Test Setup A). Connect an N6784A as a load to the
output terminals. For models N678xA SMU only, observe the following
additional connection requirements:
a. Twist the load leads, the length cannot exceed 3 ft.
b. Connect a 150 μF cap and 50 mΩ resistor across the load.
c. Disconnect the sense jumpers. Keep 4-wire sensing enabled.
d. Connect a 22 AWG twisted-pair from the +/- sense terminal to the
output terminals of the N6784A load.
2 Turn on the DC Power Analyzer and program the instrument as
described in the test record form under “Transient Response 6 V”.
tttt
t
v
Loadi ng
Tr ansi ent
Unl oadi ng
Tr ansi ent
v
t
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