Technical data

Service Guide 5
U8001A/U8002A User’s and Service Guide 67
Current Monitoring Resistor
To eliminate output current measurement error caused by
the voltage drops in the leads and connections, connect the
current monitoring resistor (R
M
) 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.
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 5-8 General Measurement