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Electronic Load
Many of the test procedures require the use of a variable load capable of dissipating the required power.
For most tests, an electronic load is considerably easier to use than load resistors, but it may not be fast
enough to test transient recovery time and may be too noisy for the noise (PARD) tests.
NOTE:
When using an electronic load with a bi-polar dc source, be sure to reverse the polarity
of the load connections to match the appropriate polarity.
Fixed load resistors may be used in place of a variable load, with minor changes to the test procedures. If
resistors are used, switches should also used to connect, disconnect, or short the load resistors.
Programming
You can only program the dc source from a GPIB controller when performing the tests. The test
procedures are written assuming that you know how to program the dc source remotely from an GPIB
controller. Also, when performing the verification tests from a GPIB controller, you may have to
consider the relatively slow settling times and slew rates of the dc source as compared to computer and
system voltmeters. Suitable WAIT statements can be inserted into the test program to give the dc source
time to respond to the test commands.
Test Setup
OUTPUT 1 MATING PLUG SHOWN
Hsen Hi
Lo Lsen
I
+
-
DC voltmeter
or
DC ammeter
or
Scope
A.
Hsen Hi
Lo Lsen
50
+
-
Scope
or
D
RMS meter
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Hsen Hi
+
DC voltmeter
B.
Hsen Hi
I
Current
Probe
(optional)
+
Electronic
+
Scope
E
Figure B-1. Verification and Calibration Test Setup
Performance and Calibration Procedures
Lo Lsen
-
Lo Lsen
-
Current
Load
Probe
-
F
Hsen Hi
Lo Lsen
+
-
DC ammeter
C
Hsen Hi
Lo Lsen
I
+
-
Function
Generator
85
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