Applent Instruments AT381x, User Manual, Page: 127 / 134

127 Accuracy
13.3.2 Function check
Each soft key, display, terminal, etc. of the instrument should work normally, and all functions
are correct.
13.3.3 Test signal level accuracy test
Place the digital multimeter on the AC voltage range with one test probe connected to the HD
side of the meter and the other test probe connected to ground. Change the level to: 0.1V,
0.3V, 1V should meet the requirements in Appendix A.
13.3.4 Frequency accuracy test
Connect the ground terminal of the frequency meter to the ground of the AT381x. The test
terminal of the frequency meter is connected to HD terminal of the instrument test terminal.
Change the frequency to: 20Hz, 100Hz, 1kHz, 10kHz, 100kHz, the reading of the frequency
meter should meet the requirements in the specification.
13.3.5 Capacitance C, loss D accuracy test
Parameter Cp-D
Test frequency 100Hz 1kHz 10kHz 100kHz test separately
Level 1V
Range AUTO
Speed Slow
Short circuit and open circuit correction should be performed before testing. Connect
standard capacitors 100pF, 1000pF, 10000pF, 10nF, 0.1uF, 1uF, change the frequency, the error
capacitance C between the instrument reading and the standard value should be within the
allowable error range specified in 6.1, and the loss D should be allowed in 6.1. Within the error
range.
13.3.6 Inductance L accuracy test
Parameter Ls-Q
Test frequency 100Hz 1kHz 10kHz 100kHz test separately
Level 1V
Range AUTO
Speed Slow
Short circuit and open circuit correction should be performed before testing. Connect the
standard inductors 100
µ H, 1mH, 10mH, 100mH, change the frequency, the error between the
instrument reading and the standard value should be within the allowable error range
specified in 6.1.
13.3.7 Impedance Z accuracy test
Parameter Z-
θ
Test frequency 100Hz, 1kHz, 10kHz, 100kHz test separately
Level 1V
Range AUTO
Speed Slow
Short circuit and open circuit correction should be performed before testing. Connect the AC