Agilent Technologies N6700 Series User Manual page 121

Series N6700 User's Guide
5
Open the load. Record the voltage reading from the DVM again.
The difference between the DVM readings in steps 4 and 5 is the
load effect, which should not exceed the value listed in the test
record form for the appropriate model under "CV Load Effect".
CV Source Effect
Test category = performance
This test measures the change in output voltage that results from a
change in AC line voltage from the minimum to maximum value
within the line voltage specifications.
1
Turn off the power system and connect the ac power line through
a variable voltage transformer or an AC source.
2
Connect a DVM and an electronic load as shown in Test Setup
figure (A). Set the variable voltage transformer or AC source to
nominal line voltage.
3
Turn on the power system and program the instrument settings
as described in the test record form under "CV Source Effect".
4
Set the electronic load for the output channel's current as
described in the test record form under "CV Source Effect". The
CV annunciator on the front panel must be on. If it isn't, adjust
the load so that the output current drops slightly.
5
Adjust the transformer or AC source to the lowest rated line
voltage (86 VAC).
6
Record the output voltage reading from the DVM.
7
Adjust the transformer or AC source to the highest rated line
voltage (264 VAC).
8
Record the output voltage reading on the DVM. The difference
between the DVM reading in steps 6 and 8 is the source effect,
which should not exceed the value listed in the test record form
for the appropriate model under "CV Source Effect".
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 rms or peak-to-peak output
voltage in the frequency range specified in Appendix A.
1
Turn off the power system and connect the load resistor,
differential amplifier, and an oscilloscope (ac coupled) to the
output as shown in Test Setup figure (C). Use the 50 Ω load for
50 W outputs; use the 25 Ω load for 100 W outputs.
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.
Verification
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