Hioki Resistance Meters

High-precision resistance meters with wide measurement range.

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RM3548-50

Hioki RM3548-50 Resistance Meter

Wide-range precision resistance meter from 3mΩ to 3MΩ in 10 ranges using the DC four-ter...

₹98,471 ₹83,700 + 18% GST

What is a Resistance Meter?

A resistance meter (ohmmeter) measures electrical resistance in ohms (Ω). While multimeters measure resistance as one function, dedicated resistance meters provide higher accuracy and special ranges for specific applications like grounding resistance, continuity testing, and fault location.

Why this matters: Resistance measurement is critical for safety and troubleshooting. High resistance in ground connections can cause electrocution. High resistance in motor windings indicates shorts. Accurate resistance measurement catches problems before they cause fires or failures.

Key advantage: A ₹10,000 resistance meter prevents catastrophic equipment failures worth ₹5,00,000+.

Why Choose the Hioki RM3548-50?

Hioki's RM3548-50 is trusted for precision DC resistance measurement:

1. Ultra-Low Resistance Measurement (3mΩ Range)

Measures from 3mΩ with 0.1μΩ resolution — sensitive enough to catch contact and weld resistance faults that basic multimeter ohm functions miss entirely.

2. Wide Range Up to 3.5MΩ

Ten ranges span from milliohms to megohms in one instrument, covering everything from weld and bonding checks to winding and cable resistance.

3. Temperature Measurement & Correction

A built-in thermistor input (-10°C to 99.9°C) lets the meter correct temperature-dependent resistance readings — useful for accurately comparing motor winding measurements taken at different times or conditions.

4. Automatic Protection Against Voltage

Built-in overvoltage protection (up to 42.4V peak AC / 60V DC) halts measurement and protects the instrument if you accidentally connect it to a live circuit.

5. Exceptional Accuracy (±0.020%)

Far beyond typical multimeter resistance accuracy — suited to EV maintenance, aircraft overhaul, motor winding inspection and any application where warranty-grade precision matters.

Popular Hioki Resistance Meter Models

From basic ohmmeter to advanced resistance analyzer:

Type	Model	Range	Accuracy	Best For
Precision DC Resistance Meter	RM3548-50	3mΩ-3.5MΩ (10 ranges)	±0.020%	EV maintenance, motor windings, aircraft overhaul, precision contact-resistance work

Resistance Measurement Applications in Indian Industry

Accurate resistance measurement is essential for:

Motor Winding Diagnostics

Measure three-phase winding resistance to detect open circuits, shorts, and unbalanced coils. Prevents catastrophic motor failure.

Transformer Testing & Quality Assurance

Measure DC resistance of transformer windings to verify transformer is healthy and not damaged during installation.

Cable Continuity & Fault Location

Measure resistance along cable to locate faults, shorts, and breaks. Saves time and eliminates guesswork in cable troubleshooting.

Contact & Connection Verification

Verify low resistance at electrical connections. High resistance at contacts causes overheating and equipment damage.

Equipment Acceptance Testing

Before accepting new equipment, verify resistance specs match manufacturer documentation. Catch damage in transit.

Preventive Maintenance Trending

Track resistance changes over time to detect degradation before failure. Increases equipment life and prevents unexpected downtime.

Frequently Asked Questions

What is continuity testing?

Measuring resistance to confirm an electrical path exists — typically under about 50 ohms for a good connection. High resistance suggests a broken or corroded connection.

Why does motor winding resistance matter?

Three-phase motors should have balanced winding resistance across all three phases (typically within a few percent of each other). Unbalanced resistance indicates shorts, open circuits, or manufacturing defects.

Can I measure resistance on live circuits?

No. Resistance measurement requires a de-energised circuit. The RM3548-50 includes automatic overvoltage protection (up to 42.4V AC / 60V DC) that halts the measurement if it detects unexpected voltage, but this is a safety backstop, not a reason to test live circuits deliberately.

What does high resistance at an electrical connection mean?

High resistance causes excessive heat at that connection, which can melt insulation and start fires. Clean or replace the connection as soon as it is identified.

How accurate is the RM3548-50 compared to a multimeter?

The RM3548-50 delivers ±0.020% basic accuracy with 0.1μΩ resolution, dramatically more precise than a typical multimeter's resistance function. This level of precision is needed for EV maintenance, aircraft overhaul, and warranty-grade motor and equipment testing.

Why does the RM3548-50 measure temperature as well as resistance?

Resistance in conductors like copper windings changes with temperature. The built-in thermistor input lets the meter apply temperature correction, so measurements taken on different days or at different winding temperatures can be compared fairly — and the reading can even be converted to an estimated motor temperature.

What is the four-terminal (Kelvin) measurement method, and why does it matter?

A four-terminal measurement uses separate pairs of leads for applying current and sensing voltage, which eliminates the resistance of the test leads themselves from the reading. This is essential for accurate low-resistance measurement — a standard two-wire ohmmeter simply cannot achieve milliohm-level accuracy because lead resistance would dominate the reading.

Buy Hioki Resistance Meters in India

Industrial Supply Syndicate is an authorized independent reseller of Hioki resistance meters in India. We stock the complete range and ship pan India with GST invoice. For bulk orders, institutional procurement, and tender requirements, please contact us for special pricing.