Calibration Procedures 1Keysight U1241C/U1242C Service Guide 25Performance Verification TestsUse the performance verification tests to verify the measurement performance ofthe multimeter. The performance verification tests use the multimeter’sspecifications listed in the U1241C/U1242C datasheet(http://literature.cdn.keysight.com/litweb/pdf/5992-0848EN.pdf).The performance verification tests are recommended as acceptance tests whenyou first receive the multimeter. The acceptance test results should be comparedagainst the 1-year test limits. After acceptance, you should repeat theperformance verification tests at every calibration interval.If the multimeter fails the performance verification tests, adjustment or repair isrequired.NOTE Ensure that you have read the “Test Considerations” on page 24 before runningthe performance verification tests.Table 1-2 Z LOW (DC V) performance verification testsTest function Range 5520A/5522AoutputError from nominal 1 yearU1241C U1242CZ LOW (DC V) [a]Turn the rotary switch to the position and press.1000 V 30 V N/A ±0.7 VZ LOW (Input impedance)[a]Turn the rotary switch to the position.1000 V 1.8 kΩ N/A ±0.180 kΩ[a] Functional test only.Z LOWShiftEscViewZ LOW