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The HIOKI RM3545 and RM3544 are bench-top DC resistance meters built for high-accuracy four-terminal measurement on production lines and in development labs. The RM3545 is positioned as a super-high-accuracy, multi-channel meter for advanced development and production applications, while the RM3544 is an easy-to-use meter that suits both manual operation and integration with automatic lines. Both perform four-terminal (Kelvin) direct-current resistance measurement using a constant-current method with a guard terminal that minimizes the effect of external noise.
Across the series the meters are applied to a wide span of components: motors, solenoids, choke coils, transformers, and wire harnesses; contacts, relay contacts, and switches; fuses, resistors, heaters, wires, and welds; and high-resistance materials such as conductive rubber and paint. The RM3545 additionally addresses compact fuses, airbag inflators, and compact magnetic components such as EMC filters and ferrite beads, along with multi-contact resistance measurement of motor and transformer windings and small-signal contacts. Illustrated application setups include measuring a three-phase motor winding, testing a connector or wiring harness, testing a relay, and testing battery terminal welds.
ValueTronics stocks and holds its own inventory in a 20,000-square-foot secure warehouse at 1675 Cambridge Drive in Elgin, Illinois, so the resistance meters listed here are managed directly by our team. Every pre-owned unit is inspected and functionally verified in-house before it ships, while new units leave factory-sealed exactly as received from the manufacturer.
The RM3545/RM3544 series comprises two bench-top resistance-meter lines that HIOKI positions by application. The RM3545 is described as a super-high-accuracy, multi-channel meter for advanced development and production applications, while the RM3544 is an easy-to-use meter that suits both manual operation and integration with automatic lines. HIOKI frames the choice between the two models around the intended measurement application.
Within each line, configuration variants extend connectivity and channel count. The RM3545 is available as the base model, the RM3545-01 with a GP-IB connector, and the RM3545-02 that supports the optional Multiplexer Unit Z3003. The RM3544 is offered as a base model and as the RM3544-01, which adds EXT I/O and RS-232C/USB communication interfaces.
Each model and configuration linked below is its own dedicated product page with pre-owned pricing matched to its condition. Select the specific model and variant that fits your channel-count, accuracy, and interface requirements to see its current pre-owned availability.
The RM3545 is the only line in the series to offer low-power (LP) resistance measurement, offset voltage compensation (OVC), temperature conversion (Δt) for temperature-rise testing, and D/A output, and — in the RM3545-02 — multiplexer-based scanning of up to 20 four-terminal locations. It reaches 0.006% basic accuracy and 0.01 µΩ resolution across a range extending to 1200 MΩ.
The two lines differ first in measurement range and precision: the RM3545 spans 0.00 µΩ to 1200 MΩ with 0.006% basic accuracy, 0.01 µΩ resolution, and up to 1 A measurement current, while the RM3544 spans 0.000 mΩ to 3.5 MΩ with 0.02% basic accuracy, 1 µΩ resolution, and up to 300 mA. The RM3545 provides a 6.5-digit display versus the RM3544's 4.5 digits.
They also differ in function set and connectivity. Low-power measurement, offset voltage compensation, temperature conversion (Δt), D/A output, and multiplexer support are provided on the RM3545 and are not available on the RM3544. EXT I/O and RS-232C/USB communications are standard on the RM3544-01 (not the base RM3544), are available on the RM3545 line, and GP-IB is specific to the RM3545-01. The comparison table that follows details each model's range, accuracy, and interface options.
| Model | Resistance Range | Max. Resolution | Basic Accuracy |
|---|---|---|---|
| RM3545 | 0.00 µΩ to 1200 MΩ | 0.01 µΩ | 0.006% |
| RM3545-01 | 0.00 µΩ to 1200 MΩ | 0.01 µΩ | 0.006% |
| RM3545-02 | 0.00 µΩ to 1200 MΩ | 0.01 µΩ | 0.006% |
| RM3544 | 0.000 mΩ to 3.5 MΩ | 1 µΩ | 0.02% |
Additional differences in specifications beyond the few shown above are not listed here — see each model's full specifications below.
Replaces: per the manufacturer, this model replaces 3540, 3541.
| Specification | Value |
|---|---|
| Measurement Types | |
| Resistance measurement | 0.000 00 mΩ (10 mΩ range) to 1200.0 MΩ (1000 MΩ range), 12 ranges |
| Low power resistance measurement | 0.00 mΩ (1000 mΩ range) to 1200.00 Ω (1000 Ω range), 4 ranges |
| Temperature measurement (thermistor) | -10.0 to 99.9 °C |
| Temperature measurement (analog input) | -99.9 to 999.9 °C |
| Measurement Conditions | |
| Measurement method | 4-terminal direct current (constant current), banana plug, with guard terminal |
| Range switching | Auto or Manual |
| Temperature correction | Reference temperature setting range: -10 °C to 99.9 °C; Temperature coefficient setting range: -99,999 ppm/°C to 99,999 ppm/°C |
| Zero-adjustment | Within ±50% f.s. of each range (Zero-adjustment is not required for 100 MΩ or greater ranges) |
| Trigger | Internal or external |
| Measurement speed | FAST / MED / SLOW1 / SLOW2 |
| Delay | Internal fixed value / 0 to 9999 ms (1 ms step) |
| Functions | Temperature correction, Temperature conversion, Self-calibration, offset voltage compensation (OVC), comparator (ABS/REF%), BIN, key-lock (OFF, menu lock, all lock), display digit count selection function (7 digits/6 digits/5 digits), automatic power supply frequency settings (AUTO/50Hz/60Hz), scaling, judgment sound setting, auto hold, statistical calculations, clock, self-test, L2105 LED Comparator Attachment output |
| Measurement fault detection functions | Contact check, over detection, current fault detection |
| Averaging | OFF, 2 to 100 averaging iterations (variable in 1-iteration steps) |
| Panel store, panel load | 30 (Front terminals), 8 (MUX (multiplexer)) |
| D/A Output | |
| Output | Resistance measured value |
| Output voltage | 0 V DC to 1.5 V DC |
| Output impedance | 1 kΩ |
| Number of bits | 12 bit |
| Interfaces | |
| EXT I/O | TRIG and other, BIN, BCD |
| Communication interfaces | Select from RS-232C, PRINTER(RS-232C), or USB |
| Communication functions | Remote function, communications monitor function, data output function, memory (50 data) |
| RS-232C | Bit rates: 115,200 / 38,400 / 19,200 / 9,600 bps |
| USB | Class: CDC (COM mode), HID (USB keyboard mode) |
| Printer (RS-232 port) | Printed data: Resistance measurement values, temperature measurement values, judgment results, measurement conditions, statistical results; Operation: Prints at PRINT signal or PRINT key input; Interval: ON/OFF, 1 to 3,600 s (variable in 1 s steps), 1 or 3 print columns per row |
| General | |
| Operating temperature and humidity | 0 to 40 °C, 80% rh or less (non-condensating) |
| Storage temperature and humidity | -10 to 50 °C, 80% rh or less (non-condensating) |
| Operating environment | Indoors, Pollution Degree 2, up to 2,000 m ASL |
| Power supply | Rated supply voltage: 100 to 240 VAC ±10%, Rated supply frequency: 50/60 Hz |
| Rated power consumption | 40 VA |
| Insulation withstand potential | 1.62 kV AC for 1 min. (with 10 mA cutoff current), between all mains supply terminals and protective ground, interfaces, and measurement terminals |
| Dimensions | Approx. 215W × 80H × 306.5D mm (8.46"W × 3.15"H × 12.07"D) (without projections) |
| Mass | Approx. 2.5 kg (88.2 oz) |
| Accessories | Power cord ×1, CLIP TYPE LEAD L2101 ×1, TEMPERATURE SENSOR Z2001 ×1, male EXT I/O connector ×1, instruction manual ×1, application disc ×1, USB cable (A-to-B type) ×1, extra fuse ×1 |
| Applicable standards | Safety: EN61010; EMC: EN61326, EN61000-3-2, EN61000-3-3 |
| Product warranty | 1 year |
| Resistance Measurement Accuracy — LP OFF (Accuracy = ±(% rdg. + % f.s.); parentheses = OVC ON; f.s. = 1,000,000 dgt., 0.001% f.s. = 10 dgt.) | |
| 10 mΩ range (max 12.000 00 mΩ, res 10 nΩ, 1 A, max open-terminal 5.5 V) | FAST 0.060+0.050 (0.060+0.015); MED 0.060+0.020 (0.060+0.002); SLOW1 0.060+0.020 (0.060+0.001); additional accuracy without 0ADJ 0.020 %f.s. |
| 100 mΩ range, High current (max 120.000 0 mΩ, res 100 nΩ, 1 A) | FAST 0.060+0.010 (0.060+0.003); MED 0.060+0.010 (0.060+0.001); SLOW1 0.060+0.010 (0.060+0.001); additional accuracy without 0ADJ 0.002 %f.s. |
| 100 mΩ range, Low current (100 mA) | FAST 0.014+0.050 (0.014+0.015); MED 0.014+0.020 (0.014+0.002); SLOW1 0.014+0.020 (0.014+0.001); additional accuracy without 0ADJ 0.020 %f.s. |
| 1000 mΩ range, High current (max 1200.000 mΩ, res 1 μΩ, 100 mA) | FAST 0.012+0.010 (0.012+0.003); MED 0.012+0.008 (0.012+0.001); additional accuracy without 0ADJ 0.002 %f.s. |
| 1000 mΩ range, Low current (10 mA) | FAST 0.008+0.050 (0.008+0.015); MED 0.008+0.020 (0.008+0.002); additional accuracy without 0ADJ 0.020 %f.s. |
| 10 Ω range, High current (max 12.000 00 Ω, res 10 μΩ, 10 mA) | FAST 0.008+0.010 (0.008+0.003); MED 0.008+0.008 (0.008+0.001); additional accuracy without 0ADJ 0.002 %f.s. |
| 10 Ω range, Low current (1 mA) | FAST 0.008+0.050 (0.008+0.015); MED 0.008+0.020 (0.008+0.002); additional accuracy without 0ADJ 0.020 %f.s. |
| 100 Ω range, High current (max 120.000 0 Ω, res 100 μΩ, 10 mA) | FAST 0.007+0.005; MED 0.007+0.002; SLOW1 0.007+0.001 |
| 100 Ω range, Low current (1 mA) | FAST 0.008+0.010 (0.008+0.003); MED 0.008+0.010 (0.008+0.001); additional accuracy without 0ADJ 0.002 %f.s. |
| 1000 Ω range (max 1200.000 Ω, res 1 mΩ, 1 mA) | FAST 0.007+0.005; MED 0.006+0.002; SLOW1 0.006+0.001 |
| 10 kΩ range (max 12.000 00 kΩ, res 10 mΩ, 1 mA, 20 V) | FAST 0.008+0.005; MED 0.007+0.002; SLOW1 0.007+0.001 |
| 100 kΩ range (max 120.000 0 kΩ, res 100 mΩ, 100 μA) | FAST 0.008+0.005; MED 0.007+0.002; SLOW1 0.007+0.001 |
| 1000 kΩ range (max 1200.000 kΩ, res 1 Ω, 10 μA) | FAST 0.015+0.005; MED 0.008+0.002; SLOW1 0.008+0.001 |
| 10 MΩ range (max 12.000 00 MΩ, res 10 Ω, 1 μA) | FAST 0.030+0.005; MED 0.030+0.002; SLOW1 0.030+0.001 |
| 100 MΩ range, high-precision mode ON (resolution 100 Ω, 100 nA) | FAST 0.200+0.005, MED 0.200+0.002, SLOW1 0.200+0.001 |
| 100 MΩ range, high-precision mode OFF (resolution 10 kΩ, max. 1 μA) | 10.00 MΩ or less: 0.50+0.02; 10.01 MΩ or more: 1.00+0.02 |
| 1000 MΩ range, high-precision mode OFF (resolution 100 kΩ) | 100.0 MΩ or less: 1.00+0.02; 100.1 MΩ or more: 10.00+0.02 |
| Multiplexer (RM3545-02) | Number of installed units: Max. 2; Support unit: Z3003; Number of channels that can be set: 42; switching time 30 ms (reference value) |
| D/A output accuracy | Resistance measurement accuracy ±0.2% f.s. (temperature coefficient ±0.02% f.s./°C); response time: measurement time + max. 1 ms |
| Additional Accuracy When Using the Z3003 | |
| Effects of leak current | Add reading error (1×10⁻⁹ [A] / I_MEAS [A]) × 100 [% rdg.] when using guarding (humidity < 70% RH; ≥ 70% RH multiply by 5) |
| Effect of offset resistance fluctuations (2-wire) | Add wiring resistance 0.1 Ω to the error component |
Important: Proper operation of the RM3545 and RM3544 is not guaranteed when using test leads that lack guard terminals.
Important: The base RM3544 does not include EXT I/O or communication interfaces (RS-232C or USB). Select the RM3544-01 for these functions.
Important: Multiplexer Units (Z3003) cannot be installed in the RM3545 or RM3545-01; only the RM3545-02 supports the Z3003.
Important: Temperature correction requires the Temperature Sensor Z2001 or a thermometer capable of generating analog voltage output (an infrared thermometer or similar instrument). The Z2001 is bundled with the RM3545/RM3545-01/RM3545-02 but is an option (not included) for the RM3544/RM3544-01.
Important: MULTIPLEXER UNIT Z3003: Cannot be used in combination with a withstand voltage tester. When used with a withstand voltage tester, the Z3003's internal relay will cause an insulation breakdown, resulting in electric shock or equipment damage.
Important: RM3545 only: a warmup time of 60 min. or greater is required for full guaranteed accuracy; if less than 60 min., double the figures in the accuracy table to obtain the measurement accuracy.
Usage tip: pair the RM3545-02 with the optional HIOKI Multiplexer Unit Z3003 to scan up to 20 locations with 4-terminal measurement.
This pre-owned unit is inspected and functionally verified in-house before it ships and is backed by our pre-owned warranty. To confirm its exact condition, firmware revision, installed options, or included accessories for your application before ordering, contact our Test Architects.
ValueTronics supplies both new and used test and measurement equipment. New units ship factory-sealed, exactly as received from the manufacturer; every used unit is inspected and functionally verified in-house at our 20,000 sq ft secure facility in Elgin, Illinois before it ships. Our Test Architects can help you select the condition, calibration, and configuration that fit your application.
Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.
Model No
HIOKI
Condition
Pre-Owned
Manufacturer
HIOKI
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