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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.
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 new pricing matched to its condition. Select the specific model and variant that fits your channel-count, accuracy, and interface requirements to see its current new 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 |
|---|---|---|---|
| RM3545-02 | 0.00 µΩ to 1200 MΩ | 0.01 µΩ | 0.006% |
| 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% |
| 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 | By range, by step (RM3545-02 only); Within ±50% f.s. of each range (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)) |
| Multiplexer (RM3545-02 only) | |
| Number of installed units | Max. 2 |
| Measurement terminal settings | Front terminals / MUX (multiplexer); when using the MUX setting, the measurement leads cannot be connected to the front measurement terminals |
| Support unit | Z3003 |
| Number of channels that can be set | 42, switching time 30 ms (reference value) |
| 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 (Multiplexer Units cannot be installed together with GP-IB; GP-IB is RM3545-01 only) |
| 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. 3.2 kg (112.9 oz) (not including Z3003) |
| 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 |
| MULTIPLEXER UNIT Z3003 Specifications (optional, used with RM3545-02) | |
| Measurement targets | 4-wire: 10 locations (when using 2 units, 20 locations); 2-wire: 21 locations (when using 2 units, 42 locations) |
| Measurable range — measurement current | Internal instrument: 1 A DC or less; External instrument: 1 A DC or less, 100 mA AC or less |
| Measurable range — measurement frequency | External instrument DC, 10 Hz to 1 kHz |
| Contact type | Mechanical relay |
| Maximum allowable voltage | 33 V RMS and 46.7 V peak or 70 V DC |
| Maximum allowable power | 30 W (DC), (Resistance load) |
| Contact service life | 4-wire: 50 million cycles (reference value) |
| Switching time | 30 ms/ch |
| Resistance / Temperature Measurement Accuracy | |
| Resistance, D/A output and temperature measurement accuracy | Identical to the RM3545 (same measurement hardware/tier); basic accuracy 0.006% rdg. See the RM3545 specifications for the full per-range accuracy tables (LP OFF, LP ON, D/A output, and temperature). Additional uncertainties apply when measuring through the Z3003. |
| Low Power Resistance Accuracy — LP ON (± (% rdg. + % f.s.)) | |
| 1000 mΩ range (1200.00 mΩ) | Resolution 10 µΩ; 0.200 + 0.005 (SLOW1); 1 mA; max open-terminal voltage 20 mV |
| 10 Ω range (12.000 0 Ω) | Resolution 100 µΩ; 0.200 + 0.003 (SLOW1); 500 µA |
| 100 Ω range (120.000 Ω) | Resolution 1 mΩ; 0.200 + 0.003 (SLOW1); 50 µA |
| 1000 Ω range (1200.00 Ω) | Resolution 10 mΩ; 0.200 + 0.003 (SLOW1); 5 µA |
| Multiplexer Unit Z3003 — Additional Accuracy (added to RM3545 specifications) | |
| 30 mΩ (max 35.000 mΩ) | FAST 0.030+0.080, MED/SLOW 0.030+0.070, current 300 mA, open-circuit 5.5 V max. |
| 300 mΩ (max 350.00 mΩ) | FAST 0.025+0.017, MED/SLOW 0.025+0.014, current 300 mA |
| 3 Ω (max 3.500 0 Ω) | FAST 0.025+0.017, MED/SLOW 0.025+0.014, current 30 mA |
| 30 Ω (max 35.000 Ω) | FAST 0.020+0.010, MED/SLOW 0.020+0.007, current 10 mA |
| 300 Ω (max 350.00 Ω) | FAST 0.020+0.010, MED/SLOW 0.020+0.007, current 1 mA |
| 3 kΩ (max 3.500 0 kΩ) | FAST 0.020+0.010, MED/SLOW 0.020+0.007, current 1 mA |
| 30 kΩ (max 35.000 kΩ) | FAST 0.020+0.010, MED/SLOW 0.020+0.007, current 100 µA |
| 300 kΩ (max 350.00 kΩ) | FAST 0.040+0.010, MED/SLOW 0.040+0.007, current 5 µA |
| 3 MΩ (max 3.500 0 MΩ) | FAST 0.200+0.010, MED/SLOW 0.200+0.007, current 500 nA |
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 is a brand-new, factory-sealed unit, supplied exactly as it arrives from the manufacturer and backed by the full manufacturer warranty. For the exact configuration, available options, included accessories, or current lead time for your application, our Test Architects can confirm the details before you order.
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.
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