Service manual

Verification 9
2
Verification
Introduction
This chapter provides test procedures for checking the operation of Agilent Series 669xA power supplies. The required test
equipment is specified and sample performance test record sheets are included. Instructions are given for performing the
tests either from the front panel or from a controller over the GPIB.
Tests
Two types of procedures are provided: Operation Verification tests and Performance tests.
Type of Test Purpose
Operation Verification These tests do not check all parameters, but comprise a short procedure to verify that the power
supply is performing properly.
Performance These tests verify all the Specifications (not Supplementary Characteristics) listed in Table 1-1
of the Power Supply Operating Manual.
If you encounter failures or out-of-specification test results, see Troubleshooting Procedures (Chapter 3). The procedures
will determine if repair and/or calibration is required.
Note The power supply must pass the selftest at power-on before the following tests can be performed. If the
power supply fails selftest, go to Chapter 3.
Test Equipment Required
Equipment List
Table 2-1 lists the equipment required to perform the tests given in this chapter. Only the equipment marked with the
superscript "
1
'' is needed for the Operation Verification test.
Current-Monitoring Resistor
The four-terminal, current-monitoring resistor (current shunt) listed in Table 2-1 is required to eliminate output current
measurement error caused by voltage drops in leads and connections. The specified current shunts have special
current-monitoring terminals inside the load connection terminals. The accuracy of the current shunt must be 0.04% or
better. Connect the current monitor directly to these current-monitoring terminals.
Electronic Load
Many of the test procedures require the use of a variable load capable of dissipating the required power. If a variable
resistor is used, switches must be used for connecting, disconnecting, and shorting the load resistor. For most tests, an
electronic load (see Table 2-1) is easier to use than a variable resistor. However, an electronic load may not be fast enough
for testing transient recovery time or may be too noisy for testing noise (PARD). In these cases, fixed load resistors of
suitable power dissipation can be used with minor changes to the test procedures given in this chapter.