Temperature Stabilized Multiple Resistance Standard - Model MRS
- TEMPERATURE CONTROLLED
- DECADE OR THERMOMETRY VALUES
- TRANSPORTABLE
Ohm-Labs Multiple Resistance Standard contains multiple standards in a constant temperature bath.
The standard model MRS has seven high stability standards, similar to those used in Ohm-Labs’ 100 series air resistance standards. Any resistance values between 0.1 ohm and 100 megohms may be specified. For example, thermometry or strain gage ratio models can be supplied.
Any temperature coefficient of resistance is largely eliminated by the constant temperature housing, controlled and monitored by a precision temperature control circuit. Relative humidity and pressure effects are negligible. Gold plated tellurium copper binding posts reduce thermal emf errors.
A precision thermometer indicates resistor temperature. A thermistor and two ports are provided for an external monitoring. The MRS may be set from 18 to 30 °C to characterize the resistors. The MRS temperature stabilizes in about one hour, allowing resistance standards to be used in the field or on-site with high accuracy.
ISO 17025 accredited, SI traceable calibration is included.
For less than the cost of seven resistance standards, the model MRS provides superior performance and versatility. With model MCS and MHS, state-of-the-art resistance may be maintained from 0.1 milli-ohm to 1 teraohm without the need for constant temperature baths or precision thermometers.
Model MRS carries a two year warantee.
The MRS is available in various model configurations, with or without constant temperature control. See OPTIONS below.
Condensed Specifications
| Nominal Resitance | Initial Tolerance (< ppm) |
Temperature Coefficient (<ppm/°C) |
Calibration Accuracy (< ppm) |
12 Mo Stability (<ppm/yr) |
Recom. |
| 0.1 Ohm | 10 | 0.01 | 0.5 | 5 | 1000 |
| 1 | 5 | 0.005 | 0.5 | 2 | 100 |
| 10 | 5 | 0.005 | 0.5 | 2 | 30 |
| 100 | 5 | 0.005 | 0.7 | 2 | 10 |
| 1 K | 5 | 0.005 | 1.1 | 2 | 3 |
| 10 K | 5 | 0.005 | 0.5 | 2 | 1 |
| 100 K | 10 | 0.005 | 3 | 2 | 0.3 |
| 1 M | 15 | 0.01 | 4 | 2 | 0.1 |
| 10 M | 20 | 0.02 | 10 | 5 | 0.03 |
| 100 M | 30 | 0.02 | 25 | 5 | 0.01 |
Notes
- Tolerance is at time of manufacture.
- Temperature coefficient is 18-30 °C
- Operating: 18-30 °C, 15-60 %RH; storage 0-40 °C, 5-95 %RH
- Electrical: 100-240 VAC, 50-60 Hz
Physical
- 47x14.7x46.3 cm (17.75x5.25x18.25 in) 3U; 16 kg / 35 lbs
Accessories available
- Thermistor cable (2 mm plug to 4 mm plug or spade lug
Optional Model Configurations
- Model MRS-(X): Customer specified values with constant temperature enclosure.
- Model MRS-AF: (10) standards, 0.1-100 M, rear terminals, constant temperature, with RTD and thermometer bridge - US AIr Force configuration.
- Model MRS-AF9: (9) standards, 1-100 M or 0.1-10 M, front terminals, NSN 6625-01-555-4371 - US Air Force configuration.
