Keysight Technologies E364xA Series User's And Service Manual

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Keysight Technologies E364xA Series User's And Service Manual Manual pdf 202 page image

8 Service and Maintenance204 E364xA User’s and Service GuideCurrent-monitoring resistorTo eliminate the output current measurement error caused by the voltage drops inthe leads and connections, connect the current-monitoring resistor between the(–) output terminal and the load as a four-terminal device. Connect thecurrent-monitoring leads inside the load-lead connections directly at themonitoring points on the resistor element (refer to R M in Figure 8-1).General measurement techniquesTo achieve best results when measuring load regulation, peak-to-peak voltage,and transient response time of the power supply, measuring devices must beconnected through the hole in the neck of the binding post at (A) while the loadresistor is plugged into the front of the output terminals at (B). A measurementmade across the load includes the impedance of the leads to the load. Theimpedance of the load leads can easily be several orders of the magnitude greaterthan the power supply impedance and thus invalidate the measurement. To avoidmutual coupling effects, each measuring device must be connected directly to theoutput terminals by separate pairs of leads.Figure 8-2 Front/ rear panel terminal connections