Keysight U3606B, Service Manual

Page: 40 / 123

1 Calibration Procedures
40 Keysight U3606B Service Guide
Performance Verification Tests
The performance verification tests are recommended as acceptance tests when
you first receive the instrument. The acceptance test results should be compared
against the 1-year test limits. After acceptance, you should repeat the
performance verification tests at every calibration interval.
If the instrument fails the performance verification, adjustment or repair is
required.
Adjustment is recommended at every calibration interval. If adjustment is not
made, you must establish a guard band , using no more than 80% of the
specifications, as the verification limits.
Zero offset verification test
This test is used to check the zero offset performance of the instrument.
Verification checks are only performed for those functions and ranges with unique
offset calibration constants. Measurements are checked for each function and
range as described in the procedure on the next page.
Zero offset verification procedure
1 Connect the shorting plug (low-thermal EMF double banana short bar) to the
V (red) and LO input terminals (see Figure 1-1, “Test setup for zero offset
(short) verification,” on page 27). Leave the current input open.
2 Select each function and range in the order shown in Table 1-2 . (Remember to
remove the shorting plug for zero offset capacitance and DC current
verification.) Make a measurement and observe the result.
3 Compare the measurement results to the appropriate test limits in Table 1-2 .
NOTE
The resistance measurements uses the Null math function (the null reading is
taken with the test leads connected together) to eliminate the test lead
resistance. See Chapter 2 of the U3606B User’s Guide, “Null,” starting on page
63 for more information on the Null math function.