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Performance and Calibration Procedures
85
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
A.
DC voltmeter
-+
OUTPUT 1 MATING PLUG SHOWN
Hsen Hi Lo Lsen
DC ammeter
I
B.
DC voltmeter
-
+
Hsen Hi Lo Lsen
or
E
Scope
-+
Hsen Hi Lo Lsen
Electronic
Load
-+
C
DC ammeter
-+
Hsen Hi Lo Lsen
F
Function
Generator
-+
Hsen Hi Lo Lsen
Current
Probe
Hsen Hi Lo Lsen
D
50
Scope
-+
or
Scope
or
RMS meter
I
Current
Probe
(optional)
I
Figure B-1. Verification and Calibration Test Setup