Measurement Techniques
47
3
Measurement Techniques
Setup for Most Tests
Most tests are performed at the front terminals as shown in the following
figure. Measure the dc voltage directly at the (+) and (-) terminals on the front
panel.
Figure 3-1. Performance Verification Test Setup
Electronic Load
Many of the test procedures require the use of a variable load resistor capable
of dissipating the required power. Using a variable load resistor requires that
switches be used to connect, disconnect, and short the load resistor. An
electronic load, if available, can be used in place of a variable load resistor and
switches. The electronic load is considerably easier to use than load resistors.
It eliminates the need for connecting resistors or rheostats in parallel to handle
power, it is much more stable than carbon-pile load, and it makes easy work
of switching between load conditions as is required for the load regulation and
load transient response tests. Substitution of the electronic load requires minor
changes to the test procedures in this chapter.
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