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Repair Manual
t
T.O .
33K8-4-551-1
TECHNICAL MANUAL
CALIBRATION PROCEDURE
FOR
DIGITAL VOLTMETER
3458A
(HEWLETT-PACKARD)
This publication incorporates Interim Operational Supplement T .O . 33K8-4-551-1S-1
dated 27 August 2007.
Distribution Statement C - Distribution authorized to U . S . Government agencies and their contractors for
official use or for administrative or operational purposes only, 7 November 1990 . Requests for this
document shall be referred to 562 CBSG/GBHA, 813 Irving-Wick Dr W, Heath, OH 43056-1199.
Destruction Notice - For unclassified, limited documents, destroy by any method that will prevent
disclosure of the contents or reconstruction of the document.
Published under Authority of the Secretary of the Air Force
30 JUNE 2007
CHANGE 1 - 30 SEPTEMBER 2007
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Questions and answers
测量标准电阻100欧姆，直流电压显示0.997mv 应显示1.00mv 请问怎么调节
To adjust the HP 3458A to display 1.00 mV when measuring a standard resistance of 100 ohms, follow these steps:
1. Set the HP 3458A to DC voltage measurement mode by selecting the appropriate function.
2. Ensure the test setup is correct by connecting the 100-ohm standard resistor in series with a known current source.
3. Apply a precise current of 10 µA (0.00001 A) to the 100-ohm resistor.
- According to Ohm’s law: Voltage (V) = Current (I) × Resistance (R)
\( V = 10 µA × 100 \Omega = 1.00 \) mV.
4. Verify that the meter is set to the correct voltage range to measure millivolts accurately.
5. Adjust the settings if needed to ensure that the display reads 1.00 mV.
This ensures the HP 3458A correctly measures and displays 1.00 mV when the 100-ohm resistor is used in the circuit.
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