The Keysight Technologies (formerly Agilent HP) 4338B is a high-speed, precise AC milliohmmeter designed for dry-circuit measurements of low-resistance components. Operating at a test signal frequency of 1 kHz, it is optimized for characterizing switches, batteries, relays, cables, connectors, and printed circuit boards where contact resistance is critical.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | GPIB, Handler interface |
| Display | Character LCD with selectable 3, 4, or 5-digit resolution |
| Warm-up Time | 30 minutes |
| Recommended Calibration Cycle | 1 year |
| Display Resolution | 3, 4, or 5 digits |
Physical
| Parameter | Value |
|---|---|
| Power Supply | 90 V to 132 V or 198 V to 264 V, 47 Hz to 66 Hz, 45 VA max |
| Operating Temperature | 0 to 55 °C |
| Dimensions (W×H×D) | 320 mm × 100 mm × 300 mm |
| Weight | 4.5 |
Measurement Performance
| Parameter | Value |
|---|---|
| Measurement Parameters | R (AC resistance), X (reactance), |Z| (impedance magnitude), L (inductance), Q (quality factor) |
| Resistance Measurement Range | 10 µΩ to 100 kΩ |
| Maximum Resistance Resolution | 10 µΩ |
| Base Accuracy | ±0.4% |
| Test Signal Frequency | 1 kHz |
| Test Signal Current Range | 1 µA, 10 µA, 100 µA, 1 mA, 10 mA |
| Open Circuit Voltage Limit | 20 mV peak max |
| Range Selection Modes | Auto, Hold |
Measurement Speed and Timing
| Parameter | Value |
|---|---|
| Short Mode Measurement Speed | 34 ms |
| Medium Mode Measurement Speed | 70 ms |
| Long Mode Measurement Speed | 900 ms |
| Trigger Modes | Internal, Manual, External, GPIB |
| Trigger Delay Time Range | 0 to 9999 ms |
| Averaging Range | 1 to 256 |
Measurement Support and Functions
| Parameter | Value |
|---|---|
| Error Correction | Open/Short correction |
| Contact Check Function | Checks for open test leads or high contact resistance |
| Save/Recall States | Up to 10 instrument configuration states |
| Comparator Function | HIGH/IN/LOW sorting for primary parameter, PASS/FAIL for secondary parameter |
Display and Controls
| Parameter | Value |
|---|---|
| Front Panel Key Lock | Available |
Environmental Conditions
| Parameter | Value |
|---|---|
| Operating Humidity Range | 95% RH or less at 40 °C |
| Storage Temperature Range | -40 to +70 °C |
Physical Characteristics
| Parameter | Value |
|---|---|
| Rack Mount Compatibility | Yes (with optional rack mount kits) |
Power Requirements
| Parameter | Value |
|---|---|
| Line Frequency | 47 Hz to 66 Hz |
| Power Consumption | 45 VA max |
Measurement Support
| Parameter | Value |
|---|---|
| Cable Length Compensation | 0 m, 1 m |
Measurement Safety
| Parameter | Value |
|---|---|
| Maximum Input DC Voltage | ±42 V DC max |
Interfaces
| Parameter | Value |
|---|---|
| Handler Interface (Option 001) | 36-pin Amphenol connector |
| Analog Output (Option 002) | DC voltage output proportional to the measurement value |
Inputs & Outputs
| Parameter | Value |
|---|---|
| External Trigger Input | BNC (rear panel), TTL level |
Measurement Ranges
| Parameter | Value |
|---|---|
| Inductance (L) Measurement Range | 10 nH to 15.91 H |
| Phase Angle (θ) Measurement Range | -180.00° to +180.00° |
| Impedance (|Z|) Measurement Range | 10 µΩ to 100.00 kΩ |
| Reactance (X) Measurement Range | 10 µΩ to 100.00 kΩ |
Test Signal
| Parameter | Value |
|---|---|
| Test Signal Frequency Accuracy | ±2% |
Measurement Functions
| Parameter | Value |
|---|---|
| Deviation Measurement | Δ (absolute difference), Δ% (percentage difference) |
Interfaces & Software
| Parameter | Value |
|---|---|
| Command Language | SCPI (Standard Commands for Programmable Instruments) |
Technology
AC Milliohmmeter (Dry Circuit)
Applications
Low resistance testing of switches, batteries, relays, connectors, and PCB tracks