Keysight U3606B, Service Manual

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1 Calibration Procedures
24 Keysight U3606B Service Guide
Using an electronic load
Many of the output test verification procedures require the use of a variable load
resistor capable of dissipating the required power. Using a variable load resistor
requires that switches should be used to connect, disconnect, and short the load
resistor. An electronic load however, if available, can be used in place of a variable
load resistor. 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 a carbon-pile load, and it simplifies the work of
switching between load conditions as is required for the load regulation and load
response tests. Substitution of the electronic load requires minor changes to the
test procedures in this chapter.
Connecting the current monitoring resistor
To eliminate the output measurement errors caused by 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.