Chapter 3 Calibration Procedures

Measurement Techniques

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.

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 RM in Figure 3-1).

Programming

Most performance tests can be performed only from the front panel. However, a 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 E3631A User's Guide.

Voltage and Current Values

The full-scale and maximum values of each supply are listed below. You can use this table when you test CV and CC performance verification tests.

Table 3-2 Power Supply Voltage and Current Values

Output

Full-Scale

Max. Prog.

Full-Scale

Voltage

Voltage

Current

 

+6V Output

+6 V

+6.18 V

5 A

+25V Output

+25 V

+25.75

1 A

-25V Output

-25 V

-25.75

1 A

 

 

 

 

Max. Prog.

Current

5.15A

1.03A

1.03A

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Agilent Technologies E3631A manual Current-Monitoring Resistor