Keysight / Agilent / HP 4328A Milliohmmeter
The Keysight 4328A Milliohmmeter is a precision instrument designed for accurate low-resistance measurements. It features a wide measurement range, high resolution, and stable performance, making it suitable for various applications including component testing, quality control, and material research. The 4328A offers both manual and automatic ranging, ensuring ease of use and optimal measurement accuracy. Its solid design and reliable operation make it a valuable tool for any electronics lab or production environment requiring precise low-resistance measurements.
- Model
- Keysight / Agilent / HP 4328A
- Calibration
- Available on request
- Price
- $450
- Status
- In stock
- RFQ ref
- 4328A
This unit
The Keysight 4328A Milliohmmeter is a precision instrument for low-resistance measurement using Kelvin Bridge methodology and four-terminal measurement technique. It delivers high sensitivity across 0.001 Ω to 100 Ω full scale with maximum resolution of 0.02 Ω, achieving ±2% accuracy. The instrument employs constant applied current with a 1000 Hz ±100 Hz measurement frequency and maintains sample voltage below 200 µV peak at full scale - never exceeding 20 mV peak under any condition, including incorrect range settings.
Technical Specifications
Measurement Range: 0.001 Ω to 100 Ω full scale in 1, 3, 10 sequence
Resolution: 0.02 Ω (0–1 Ω scale); 0.05 Ω (0–3 Ω scale)
Accuracy: ±2% of full scale
Measurement Frequency: 1000 Hz ±100 Hz
Sample Voltage: 200 µV peak at full scale; 20 mV peak maximum under all conditions
Series Reactance Tolerance: Unaffected up to 2× full-scale resistance
Superimposed DC Bias: Up to 150 V DC from external source
Applied Current: 150 / (full scale value in mΩ)
Recorder Output: 0.1 V DC at full scale; output impedance ≈1 kΩ
Power: 115/230 V ±10%, 50–60 Hz, 1.5 VA
Dimensions: 155 mm (H) × 130 mm (W) × 280 mm (D)
Weight: 3.2 kg
Key Features
Four-terminal measurement eliminates lead resistance errors
Low power dissipation enables heat-sensitive sample testing
Automatically limited voltage for safe measurement of fuses and explosive devices
150 V DC bias superposition for incremental back-biased diode resistance
Optional rechargeable battery (Option 001) supports 15 hours continuous operation
Recorder output for integration with external logging equipment
Typical Applications
Contact resistance in switches, relays, connectors
Conductor and semiconductor resistivity
Incremental diode resistance under bias
Compatibility & Integration Supplied with HP 16005A clip-type probe, HP 16006A pin-type probe, HP 16007A/B test leads, and HP 16143A probe cable. Accepts external DC bias sources up to 150 V.
Specifications
| Parameter | Value |
|---|---|
| Voltage / Current Range | 0.00001 Ω to 200 MΩ |
Keysight / Agilent / HP 4328A — Repair & Calibration Service
Aumictech offers NIST-traceable calibration and repair for the Keysight / Agilent / HP 4328A. Calibration covers calibration scope varies by instrument type: vacuum gauges are verified at multiple pressure points against NIST-traceable pressure standards; spectrophotometers at wavelength accuracy and photometric accuracy points; strain gauge indicators at bridge excitation accuracy and full-scale output accuracy; pH meters against certified buffer solutions at pH 4, 7, and 10.. All calibrations ship with a NIST-traceable certificate. Turnaround is typically 1–3 business days after receipt.
Common Keysight / Agilent / HP 4328A faults: vacuum gauge filament failure (ionization gauges), spectrophotometer D2 lamp end-of-life, wavelength motor failure, strain indicator front-panel binding post corrosion, pH electrode conditioning failure. Most specialty laboratory instruments fail at their electromechanical interfaces first — vacuum gauge connectors and filament assemblies, spectrophotometer lamp housings and motor drives, strain indicator binding post corrosion. Component-level repair is standard; manufacturer support for legacy instruments is often limited, making third-party bench repair the practical path.
Keysight / Agilent / HP 4328A price
This Keysight / Agilent / HP 4328A is listed at $450. Calibration is available separately from $450. Contact us for volume pricing or if you need multiple units.
Keysight / Agilent / HP 4328A calibration cost
NIST-traceable calibration for the Keysight / Agilent / HP 4328A 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 calibration scope varies by instrument type: vacuum gauges are verified at multiple pressure points against NIST-traceable pressure standards; spectrophotometers at wavelength accuracy and photometric accuracy points; strain gauge indicators at bridge excitation accuracy and full-scale output accuracy; pH meters against certified buffer solutions at pH 4, 7, and 10.. Turnaround is 1 to 3 business days after receipt. See full calibration details →
