Programming The Tests; General Considerations; Programming Parameters; General Measurement Techniques - Agilent Technologies 668xA Service Manual

Programming The Tests

General Considerations

Procedures are given for programming these tests either from the front panel keypad or from a GPIB controller. The
procedures assume you know how to use the front panel keypad or how to program over the GPIB (see the Power Supply
Operating Manual for more information). When using computer-controlled tests, you may have to consider the relatively
slow (compared to computer and system voltmeters) settling times and slew rates of the power supply. Suitable WAIT
statements can be inserted into the test program to give the power supply time to respond to the test commands.
This power supply can provide more than 240VA at more than 2 volts. If the output connections touch each
other, severe arcing can occur resulting in burns, ignition or welding of parts. DO NOT ATTEMPT
TO MAKE CONNECTIONS WHILE OUTPUT POWER IS ON. These connections should be performed
only by qualified electronics personnel.

Programming Parameters

Table 2-2 lists the programming voltage and current values for each model. You can enter these values either from the front
panel or from a controller over the GPIB.
Agilent Model Full Scale
Voltage
Agilent 6680A
Agilent 6681A
Agilent 6682A
Agilent 6683A
Agilent 6684A

General Measurement Techniques

Figure 2-1 shows the setup for the Constant Voltage tests. Measure the dc output voltage directly at the sense (+S and -S)
terminals. Connect these terminals for remote sensing (to the +S and -S terminals). Connect these terminals for local
sensing. Be certain to use load leads of sufficient wire gauge to carry the output current (see Chapter 4 of the Power Supply
Operating Manual). To avoid noise pickup, use coaxial cable or shielded pairs for the test leads. If you use more than one
meter or a meter and an oscilloscope, connect separate leads for each instrument to avoid mutual-coupling effects.

Performance Test Record Sheets

When performing the tests in this chapter, refer to the Performance Test Record sheets supplied at the end of this chapter.
Table 2-6 is for recording common information, such as, the test equipment used and the environmental conditions. Tables
2-7 through 2-11 are dedicated to specific models. Each sheet lists the acceptable test ranges for the model and provides a
place to record the results of the test.
Note
It is recommended that before you perform the tests in either Table 2-4 or Table 2-5, that you first locate
the appropriate Performance Test Record sheet from Tables 2-7 through Table 2-11 for your specific
model. Make a copy of this sheet, and record the actual observed values in it while performing the tests.
Use the sheets in Tables 2-7 through Table 2-11 as master reference sheets to run copies at any time.
Table 2-2. Programming Voltage and Current Values
Max. Prog.
Voltage
5V 5.125V
8V 8.190V
21V 21.50V
32V 32.80V
40V 41.00V
Full Scale Max. Prog.
Current Current
875A 895A
580A 592A
240A 246A
160A 164A
128A 131A
Max. Prog.
Overvoltage
6.25V
10.0V
26.3V
40.0V
50.0V
Verification 13