SRS SIM923 Platinum RTD Temperature Monitors
- Four channels with independent displays
- 1.4 K to 475 K with silicon diodes
- 20 K to 873 K with platinum RTDs
- Memory for 4 calibration curves plus standard curve
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The Stanford Research Systems SIM923 Platinum RTD Monitor is designed to measure four sensors simultaneously. Based on the modular SIM platform, they provide high performance, multiple channel capability in a small footprint.
The four channels in the SRS SIM923 have independent, stable 1 mA current sources to provide sensor excitation. Sensor resistance is determined ratiometrically, with a half-bridge circuit consisting of the sensor and an internal reference resistor. The current to the sensor can be reversed by the user to test for any offset. Measurement results can be displayed in either kelvins or ohms.
The SIM923 employs four-wire measurement circuits (±I excitation leads, ±V sense leads) making the measurements insensitive to series lead resistance.
The four channel excitations are independently controlled and do not switch on or off when the readout is advancing between channels. Sensor excitations can be disabled to reduce power dissipation at sensitive cryogenic stages. This also accelerates readings in the remaining enabled channels. Measurements are performed at rates up to four readings per second.
A factory-standard calibration curve is built in for each model. In addition, each channel has non-volatile memory to store a 256-point custom calibration curve to convert sensor units (V or Ω) to temperature units (K).
| SIM922 | SIM923 | |
| Number of inputs | 4 | 4 |
| Sensor type | Silicon diode | Platinum RTD, other RTDs |
| Measurement type | 4-wire | 4-wire |
| Excitation | 4 constant current sources | 4 constant current sources |
| 10 µA ± 0.01 %, ±5 ppm/°C |
1.0 mA ± 0.1 %, ±5 ppm/°C |
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| Sensor units | Volts | Ohms |
| Input range | 0 V to 2.5 V | 0 Ω to 1400 Ω |
| Calibration curves | 1 standard, 4 user-defined curves, 256 points each | DIN 43760, 4 user-defined curves, 256 points each |
| Temperature range | Sensor dependent, 1.4 K to 475 K (typ.) |
Sensor dependent, 20 K to 873 K (typ.) |
| Display resolution | 4 digits | 4 digits |
| Interface resolution | 1 µV | 1 mΩ |
| Measurement res | 1.2 µV rms | 1.2 mΩ rms |
| Measurement acc, (23±1) °C | 20 µV + 0.01 % of reading | 5 mΩ + 0.01 % of reading |
| Temperature coefficient | ±5 ppm/°C | ±5 ppm/°C |
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Stanford Research Systems SIM923 datasheet | Photo | Product | SKU | |
|---|---|---|---|
 | SRS SIM983 1 MHz Scaling Amplifier | - | > |
 | SRS SIM921 AC Resistance Bridge | - | > |
 | SRS SIM922 Diode Temperature Monitors | - | > |
 | SRS SIM922A Diode Monitor | - | > |
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 | SRS SR630 16 Channel Thermocouple Monitor | - | > |
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