Keysight / Agilent / HP 34401-66501 Main Board
This is a Keysight / Agilent / HP 34401-66501 Main Board for multimeter. It is a replacement part for the 34401A Digital Multimeter. This board ensures accurate and reliable performance of your instrument.
- Model
- Keysight / Agilent / HP 34401-66501
- Calibration
- Available on request
- Price
- $225
- Status
- In stock
- RFQ ref
- 34401-66501
This unit
The Keysight/Agilent/HP 34401-66501 Main Board is a replacement component for the 34401A Digital Multimeter, functioning as the central processing unit and control hub. It orchestrates signal acquisition, data conversion, and measurement operations across voltage, current, resistance, frequency, and continuity testing. This OEM-specification board maintains the accuracy and measurement integrity required in precision instrumentation.
Technical Specifications
Product Type: Main Board / Replacement Part
Manufacturer: Keysight / Agilent / HP
Model Number: 34401-66501
Application: Direct replacement for 34401A Digital Multimeter
Design Standard: Original equipment manufacturer (OEM) specifications for 34401A
Key Features
Integrates signal acquisition and processing circuitry for multifunction measurement
Supports voltage, current, resistance, frequency, and continuity measurement modes
Precision analog-to-digital conversion for measurement data
Engineered connectors for integration with display, input terminals, and power supply modules
Form factor optimized for 34401A chassis fit and internal architecture
Operates within established operational parameters and defined measurement ranges of the host instrument
Typical Applications Replacement service for 34401A multimeters requiring main board replacement due to component failure or obsolescence. Suitable for field repair in calibration labs, service centers, and industrial maintenance environments where instrument uptime depends on genuine OEM parts.
Compatibility & Integration Primary Compatibility: Keysight / Agilent / HP 34401A Digital Multimeter This main board can restore full operational capability to the 34401A when installed as a direct replacement. Internal connectors integrate with the display module, measurement input terminals, and internal power distribution. Installation using genuine OEM parts ensures measurement accuracy is preserved and maintains compliance with established calibration standards.
Keysight / Agilent / HP 34401-66501 — Repair & Calibration Service
Aumictech offers NIST-traceable calibration and repair for the Keysight / Agilent / HP 34401-66501. Calibration covers DC voltage accuracy at all ranges, AC voltage (True RMS) accuracy at 50 Hz, 1 kHz, and 10 kHz, DC current accuracy, resistance accuracy at all decade ranges, frequency accuracy, and diode test voltage. Fluke 87V and 289 also include capacitance and temperature calibration.. All calibrations ship with a NIST-traceable certificate. Turnaround is typically 1–3 business days after receipt.
Common Keysight / Agilent / HP 34401-66501 faults: blown input fuse, worn input jacks, display segment failure, relay contact wear on bench DMMs. Common faults include worn input jacks (banana socket contact wear on the mA and COM terminals), blown input fuses (especially the 440 mA HRC fuse), and display segment failures. Keithley 2000/2001/2002 bench DMMs commonly develop relay contact wear affecting resistance accuracy after extended service.
Keysight / Agilent / HP 34401-66501 price
This Keysight / Agilent / HP 34401-66501 is listed at $225. Calibration is available separately from $450. Contact us for volume pricing or if you need multiple units.
Keysight / Agilent / HP 34401-66501 calibration cost
NIST-traceable calibration for the Keysight / Agilent / HP 34401-66501 is $450 (standard — pass/fail certificate and calibration sticker) or $650 (full measured data at every test point, reference standards documented, traceability chain included). Calibration for this instrument covers DC voltage accuracy at all ranges, AC voltage (True RMS) accuracy at 50 Hz, 1 kHz, and 10 kHz, DC current accuracy, resistance accuracy at all decade ranges, frequency accuracy, and diode test voltage. Fluke 87V and 289 also include capacitance and temperature calibration.. Turnaround is 1 to 3 business days after receipt. See full calibration details →
