Key facts
- Brand
- Agilent
- Model
- 34401A
- Category
- Other
- Industry
- Electronics
- Documents
- 4
- Languages
- ZH · EN
- Last added
- 2026-10-01
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Agilent 34401A 6 ½ Digit Multimeter User's Guide
The Agilent 34401A is a digital multimeter designed for voltage, resistance, frequency (period), and diode test measurements. It features input terminals with specific protection limits to ensure safe operation against electric shock and instrument damage. The device supports IEC Measurement Category II conditions up to 300 VAC and includes overvoltage protection for transient events up to 2500 Vpk in isolated circuits.
The manual covers essential safety information, including grounding requirements, cleaning procedures, and warnings regarding the use of substitute parts or unauthorized modifications. It details the operational limits for various input terminals, such as the Main Input (HI/LO), Current Input, and Sense Terminals, ensuring users adhere to maximum voltage and current ratings.
Agilent 34401A specifications
| Measurement types | AC/DC voltage, AC/DC current, 4‑wire resistance, temperature |
|---|---|
| Resolution options | 4, 5, or 6 bits |
| Default GPIB address | 22 |
All Agilent 34401A documents by type
Day-to-day operation, settings and troubleshooting. Start here if the product is already set up.
Disassembly, diagnostics and part numbers, for repair.
Questions answered in these manuals
What safety precautions must be taken before servicing the instrument?
Disconnect the power cord from the wall outlet, remove all test leads, and only qualified personnel who have completed repair training may open the instrument cover.
How can I change the measurement resolution?
Press the Shift key together with the resolution key to select 4‑bit, 5‑bit, or 6‑bit resolution; 4‑bit gives faster measurements, while 6‑bit provides higher accuracy.
What is the default GPIB address of the 34401A?
The factory default GPIB address is 22.
What safety category is the multimeter rated for?
It is rated for IEC measurement category II, allowing connection to mains up to 300 V.
What is the maximum line voltage for IEC Measurement Category II connections?
The mains are limited to a maximum line voltage of 300 VAC.
What is the maximum transient overvoltage the instrument can withstand?
The Agilent 34401A is designed to safely withstand occasional transient overvoltages up to 2500 Vpk.