Specifications
2 Performance Verification
16 Series N6700 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 power system and connect an oscilloscope across the
sense terminals (see Test Setup A). Connect an electronic load to
the output terminals.
2 Turn on the power system and program the instrument settings
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 a 50% change in the load currents
of the 6 V range and the 20 V range for models N678xA SMU.
1 Turn off the power system 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, length must be between 1 and 4 ft.
b. Connect a 150 μF capacitor and 50 mΩ resistor directly across
the load.
2 Turn on the power system and program the instrument settings
as shown in the test record form under “Transient Response 6V”.
tttt
t
v
Loadi ng
Tr ansi ent
Unl oadi ng
Tr ansi ent
v
t