User`s guide

Chapter 3 Calibration Procedures
Measurement Techniques
50
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 3-2. Front Panel Terminal Connections (Side View)
Current-Monitoring Resistor
To eliminate 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 (see R
M
in Figure 3-1).
Programming
Most performance tests can be performed from the front panel. However, an GPIB or
RS-232 controller is required to perform the voltage and current programming
accuracy and readback accuracy tests.
The test procedures are written assuming that you know how to program the power
supply either from the front panel or from an GPIB or RS-232 controller. Complete
instructions on front panel and remote programming are given in the Agilent E3633A
and E3634A User’s Guide.