HP E1328A, Руководство по обслуживанию, Страница: 32 / 70

NOTE
The value of 500
Ω
in Figure 4-4 is the factory value used for original
measurements. If you previously calibrated your DAC with a different
resistance value, use that resistance value rather than 500
Ω
.
Test Procedure
1. Set three jumpers on each channel to the I position
2. Connect HP 3458A and 500
Ω
resistor to Channel 1 (see Figure 4-4)
3. Set HP E1328A DAC to default with *RST
4. Set Channel 1 to calibrated mode with CAL1:STAT ON
5. Output -20 mA on Channel 1 with CURR1 -.02000
6. Measure Channel 1 output current with HP 3458A and compare with
limits in Table 4-2
7. Repeat steps 5 and 6 for -16 mA, -10 mA, -4 mA, 0 mA, 4 mA, 10
mA., 16 mA, and 20 mA
8. Repeat steps 2 through 7 for Channels 2, 3, and 4 (use CALchan:
STAT ON and CURRchan value)
9. Remove power and disconnect test equipment
Example: Current
Accuracy
Measurements
This program checks the MEASURED output current on each DAC channel
and compares the result with the 1-year accuracy specifications for the DAC
(See Appendix A - Calculating D/A Converter Accuracy for a discussion of
DAC accuracy).
10 ! Current Accuracy Measurements Test
20 !
30 OPTION BASE 1
40 DIM Amps(4,9)
50 DATA -.02,-.016,-.01,-.004,0,.004,.01,.016,.02
60 DATA -.02,-.016,-.01,-.004,0,.004,.01,.016,.02
70 DATA -.02,-.016,-.01,-.004,0,.004,.01,.016,.02
80 DATA -.02,-.016,-.01,-.004,0,.004,.01,.016,.02
90 READ Amps(*)
100 OUTPUT 70909;"*RST"
110 FOR Chan = 1 TO 4
120 FOR l=1 TO 9
130 OUTPUT 70909;"CURR"&VAL$(Chan)&" ";Amps(Chan,I)
140 PRINT TABXY(1,2)," Current Accuracy Measurements on Channel
";Chan
32 Verification Tests Chapter 4