Agilent Technologies 34405A, Руководство пользователя и сервисное руководство, Страница: 71 / 143

Performance Tests and Calibration 4
34405A User’s and Service Guide 71
Zero Offset Verification
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 Test
1
Connect the Shorting Plug to the HI and LO input terminals. (see “Input
Connections” on page 67). Leave the current inputs open.
2 Select each function and range in the order shown in the table below.
Make a measurement and observe the result. Compare measurement
results to the appropriate test limits shown in the table below (table
continued on thefollowing page).
N O T E
Note that resistance measurements use the Null math function (Null reading taken with
test leads connected together) to eliminate test lead resistance.
Table 4 Zero Offset Verification Test
Input Function
[1]
Range Quick Check
Error from Nominal
1 year
Open DC Current 10mA Q ±1.5µA
Open 100mA ±5 µA
Open 1A ±70µA
Open 10A ±0.7mA
Open Capacitance 1nF ±8pF
Open 10nF ±0.05nF
Open 100nF ±0.5nF
Open 1µF ±5nF
Open 10µF ±0.05µF
Open 100µF ±0.5µF
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