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RESISTANCE METER RM3548-50

High-precision Portable Resistance Meter Measures from µΩ to MΩ

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  • When Z3210 is installed

The RM3548-50 is a precision handheld resistance meter measuring from 0.1 µΩ to 3.5 MΩ. It offers effortless operation and accuracy, making it ideal for EV maintenance, aircraft overhaul, and motor inspections.

Product Introduction Video

Leveraging its precision, the RM3548-50 goes beyond basic resistance measurement. It not only performs temperature correction but also converts resistance to estimated motor temperatures and calculates cable lengths with 1 cm precision. Its versatile probes, including high-durability pin-types and needle probes that measure through paint, meet various maintenance needs. Advanced connectivity enables seamless wireless data output for efficient recording and management of measurements. Ensuring precise readings with a four-wire method and offset voltage compensation (OVC), the RM3548-50 is the go-to tool for dependable precision maintenance.

Key Features

  • 0.02% basic accuracy, 0.1 µΩ max. resolution, 1 A max. testing current
  • Measure from 0.1 µΩ (testing current 1 A) to 3.5 MΩ
  • Automatic temperature correction ensures accurate results & faster testing
  • Advanced Connectivity: seamlessly integrate data with Excel® and a mobile app to manage & analyze data efficiently (*1)
  • Protections for safe operation: halts operation & triggers alerts when incorrect voltage inputs are detected
  • Versatile Applications: Ideal for EV, aircraft, & motor/transformer maintenance with various probe options
  • *1:Wireless Adapter Z3210 is necessary.

Model No. (Order Code)

RM3548-50

Data can be downloaded to tablets and smartphones using Hioki’s dedicated free app "GENNECT Cross," available from the Google Play or App Store. Utilizes templates that simplify data recording and analysis on your mobile device, enhancing overall workflow efficiency.

User-friendly operation

Precision engineering

Adopts the four-wire measurement method and features an offset voltage compensation (OVC) function to ensure high accuracy measurements.

Simple resistance measurement

Enables even beginners to perform resistance measurements without the complexity of multi-functional devices.

Automatic calculations

Temperature correction converts the value of a resistance that depends on temperature, such as that of a copper wire, to a resistance value at a particular temperature to display it.

Wireless communication capability for even greater convenience

Easy! Just connect the optional Z3210 Wireless Adapter to your Hioki compatible instrument, to make it Bluetooth® ready.

Wirelessly connect Hioki-compliant instruments with a simple connection.
Transfer measurements to your smartphone or tablet and quickly create reports with field photos and drawings.

Direct Excel® integration

Boost work efficiency in the field by letting you directly transfer measurement data to (i.e., enter measured values directly into) templates created as Excel®.

The optional Wireless Adapter Z3210 is required.

Versatile probing options

Variety of probes to choose from

A diverse range of probes tailored to meet specific maintenance needs across various applications.

• L2140: Ideal for EV and hybrid car maintenance, the RM3548-50 excels in equipotential bonding tests, battery connection checks, and motor winding inspections. Compliant with UN ECE R100 standards, it offers dedicated probes, straightforward resistance measurements, and a PASS/FAIL function.

• L2141, L2142: Ideal for aircraft maintenance and overhaul, the RM3548-50 performs equipotential bonding tests to check resistance differences in various areas. The L2141 probe, with its rounded tip, is perfect for measuring resistance without damaging the aircraft body, while the L2142 probe’s sharp edge allows for resistance measurement through paint.

Learn more from the Probe Selection Guide

Optimized safety features

Circuit protection

In EV maintenance or battery busbar testing, accidental contact with live voltage can damage a resistance meter. The RM3548-50 features automatic overvoltage protection to prevent this, stopping measurements and safeguarding the circuit from live voltages of up to 60 V DC.

EV maintenance test tool

4 essential test tools for EV high-voltage shutdown and reinitialization

Recommended by leading EV and hybrid manufacturers for reliable and precise maintenance tasks, the RM3548-50 meets the UN ECE R100 international safety standards, which require a minimum measurement current of 0.2 A.
We provide reliable electrical test tools to ensure safe operations for EV maintenance and service personnel.

Click here to learn more!

Basic specifications

Accuracy guaranteed: 1 year
Resistance range 3 mΩ (3.5000 mΩ display Max., 0.1 µΩ resolution) to 3 MΩ range (3.5000 MΩ display Max., 100 Ω resolution), 10 steps
Measurement accuracy: ±0.020 % rdg. ±0.007 % f.s.
Testing current [at 3 mΩ range] 1 A DC to [at 3 MΩ range] 500 nA DC
Open-terminal voltage 5.5 V DC max.
Temperature measurement -10.0°C to 99.9°C, accuracy: ±0.5°C (Temperature Sensor Z2002 and RM3548-50 combined accuracy)
Measurement speed Fixed
Display refresh rate Without OVC: approx. 100 ms
With OVC: approx. 230 ms
Functions Temperature correction, temperature conversion, offset voltage compensation (OVC), comparator (ABS/REF%), length conversion, judgment sound setting, auto hold, auto power save (APS), Averaging, panel store/panel load, USB communication interface (RM3548-50 internal memory is recognized as a mass storage device when connected to a PC), wireless communication via Bluetooth® (Z3210 is necessary)
Memory storage Number of recordable data points: up to 1000 for manual/auto, up to 6000 for interval
Interval: 0.2 s to 10.0 s (0.2 s step)
Acquisition of data from memory: display, USB mass storage (CSV, TXT files)
Power supply LR6 alkaline batteries × 8
HR6 nickel-metal hydride batteries × 8
Continuous use: approx. 10 hours (under our company’s conditions)
Rated voltage: 5 VA max.
Dimensions and weight Approx. 199 mm (7.8 in.) W × 132 mm (5.2 in.) H × 60 mm (2.4 in.) D (including the protector)
Approx. 890 g (31.4 oz) (including the batteries and protector)
Included accessories Clip Type Lead L2107 ×1, Temperature Sensor Z2002 ×1, Protector Z5041 ×1, LR6 alkaline battery ×8, Instruction Manual ×1, USB Cable (A to mini-B) ×1, Strap ×1, Spare fuse ×1

Measurement Leads (13)

The L2107 is bundled with the RM3548-50

About lead length
A: From junction to probe, B: Probe length, L: Overall length

Note: For L2107, length “A” can be extended by roughly 0.8 m (2.62 ft) by cutting the binding tube. Length “A” for all other leads cannot be extended.

CLIP TYPE LEAD L2107

A: 130 mm (5.12 in.), B:84 mm (3.31 in.), L:1.1 m (3.61 ft.), 60 V DC

TEST LEADS L2140

B: 177 mm (red), L: 1840 mm (red), 3160 mm (black), measurable conductor dia. max. approx. φ30 mm (black), 60 V DC

TEST LEAD (RED) L2140-01

B: 177 mm (red), L: 1840 mm (red), 60 V DC

TEST LEAD (BLACK) L2140-02

L: 3160 mm (black), measurable conductor dia. max. approx. φ30 mm (black), 60 V DC

PIN TYPE LEAD L2141

A: 1832 mm (red), 1832 mm (black), B: 168 mm, L: 3000 mm, 1000 V DC

PIN TYPE LEAD L2142

A: 1832 mm (red), 1832 mm (black), B: 168 mm, L: 3000 mm, 1000 V DC

FOUR TERMINAL LEAD 9453

A: 280 mm (11.02 in.), B: 118 mm (4.65 in.), L: 1360 mm (4.46 ft.), 60 V DC

PIN TYPE LEAD 9465-10

A: 45 mm (1.77 in) red, 400 mm (15.75 in) black Max., B: 177 mm (6.97 in), L: 1925 mm (75.79 in) red, 60 V DC

PIN TYPE LEAD 9465-11

A: 45 mm (1.77 in) red, 1970 mm (15.75 in) black, B: 177 mm (6.97 in), L: 1980 mm (75.79 in) red, 3900 mm (153.54 in) black, 60 V DC

TIP PIN 9465-90

To replace the tip on the 9465-10, 9465-11, L2020, L2140 (one piece)

LARGE CLIP TYPE LEAD 9467

A: 300 mm (11.81 in.), B: 131 mm (5.16 in.), L: 1350 mm (53.15 in.), tip φ 28 mm (1.10 in.), 50 V DC

PIN TYPE LEAD 9772

A: 45 mm (1.77 in) red, 400 mm (15.75 in) black Max., B: 173 mm (6.81 in), L: 1921 mm (6.30 ft) red, 60 V DC

TIP PIN 9772-90

To replace the tip of models Pin Type Lead 9772, L2100, L2110, L2120, and Pin Type Probe L2003 (one pin)

Zero adjustment board (2)

0 ADJ BOARD Z5038

For models L2120, L2100, L2110, L2020, 9465-10, 9772

ZERO ADJUSTMENT BOARD 9454

For the L2100, 9465-10, 9465, 9461

Temperature measurement, etc. (2)

The Z2002 is bundled with the RM3548-50

LED COMPARATOR ATTACHMENT L2105

2 m (6.56 ft) length

TEMPERATURE SENSOR Z2002

100 mm (3.94 in) length

Carrying case, protector (2)

CARRYING CASE C1015

Hard case

PROTECTOR Z5041

Wireless communication (1)

WIRELESS ADAPTER Z3210

Learn more

• Increase your work efficiency, by eliminating human errors from manual reporting
• Transfer readings on instruments to easy-to-read graphical reports to prove integrity
• Compliance with wireless regulations in more than 50 countries and regions

Connect to your smartphone or tablet (1)

When using the Z3210

GENNECT CROSS SF4071, SF4072

Learn more

• Mobile app for iOS, Android
• Improve efficiency of operations that repeat measurement and recording
• Analyze correlated data during issues and generate quick reports
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