8 Service and Maintenance
Measurement Techniques
194 E364xA User’s and Service Guide
Current-monitoring resistor
To eliminate the output current measurement error caused
by the voltage drops in the leads and connections, connect
the current- monitoring resistor between the (–) output
terminal and the load as a four- terminal device. Connect the
current- monitoring leads inside the load- lead connections
directly at the monitoring points on the resistor element
(Refer to R
M
in Figure 8- 2).
General measurement techniques
To achieve best results when measuring load regulation,
peak- to- peak voltage, and transient response time of the
power supply, measuring devices must be connected through
the hole in the neck of the binding post at (A) while the
load resistor is plugged into the front of the output
terminals at (B). A measurement made across the load
includes the impedance of the leads to the load. The
impedance of the load leads can easily be several orders of
the magnitude greater than the power supply impedance and
thus invalidate the measurement. To avoid mutual coupling
effects, each measuring device must be connected directly to
the output terminals by separate pairs of leads.
Figure 8-3 Front or rear panel terminal connections
TO MONITORING
DEVICE
TO LOAD OR
CURRENT
RESISTOR
[Front Panel (Side View)]
(Rear Panel)
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