2 Performance Verification
16 Series E4360 Service Guide
CV Ripple and Noise
Test category = performance
Periodic and random deviations in the output combine to produce a
residual AC voltage superimposed on the DC output voltage. This
residual voltage is specified as the peak-to-peak or rms noise in the
frequency range specified in Appendix A in the User’s Guide.
1 Turn off the solar array simulator and connect the load resistor (not
the electronic load), differential amplifier, and an oscilloscope (ac
coupled) to the output (see Test Setup figure D). Use a 7.1 Ω load
for Model E4361A (two 8 Ω resistors in parallel with one 3.1 Ω
resistor in series). Use a 24 Ω load for model E4362A (three 8 Ω
resistors in series).
2 As shown in the diagram, use two BNC cables to connect the
differential amplifier to the + and − output terminals. Each cable
should be terminated by a 50 Ω resistor. The shields of the two BNC
cables should be connected together. Connect the output of the
differential amplifier to the oscilloscope with a 50 Ω termination at
the input of the oscilloscope.
3 Set the differential amplifier to multiply by ten, divide by one, and 1
Megohm input resistance. The positive and negative inputs of the
differential amplifier should be set to AC coupling. Set the
oscilloscope’s time base to 5 ms/div, and the vertical scale to 10
mV/div. Turn the bandwidth limit on (usually 20 or 30 MHz), and set
the sampling mode to peak detect.
4 Turn on the solar array simulator and program the instrument as
indicated in the test record form under “CV Ripple and Noise” and
enable the output. Let the oscilloscope run for a few seconds to
generate enough measurement points. On the Keysight Infiniium
scope, the maximum peak-to-peak voltage measurement is shown
at the bottom of the screen on the right. Divide this value by 10 to
get the CV peak-to-peak noise measurement. The result should not
exceed the peak-to-peak limits in the test record form under “CV
Ripple and Noise, peak-to-peak (Fixed mode)”.
5 Disconnect the load from the solar array simulator and check the
results again. The results should not exceed the peak-to-peak limits
in the test record form under “CV Ripple and Noise, peak-to-peak
(Fixed mode)”.
6 Reconnect the load and program the solar array simulator to SAS
mode. Set the instrument as indicated in the in the test record form
under “SAS Curve Settings for Ripple and Noise” and enable the
output. Let the oscilloscope run for a few seconds to generate
enough measurement points. Divide this value by 10 to get the CV
peak-to-peak noise measurement. The result should not exceed the
peak-to-peak limits in the test record form under “CV Ripple and
Noise, peak-to-peak (SAS & Table mode)”.
7 Disconnect the load from the solar array simulator and check the
results again. The results should not exceed the peak-to-peak limits
in the test record form under “CV Ripple and Noise, peak-to-peak
(SAS & Table mode)”.
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