PR231 Precision Multifunction Calibrator


  • Temperature difference measurement with accuracy of 0.003 ° C
  • Standard temperature measurement
  • Reference Junction Compensation
  • Precision temperature control function
  • ρvalue measurement
  • Thermal calculator
  • Value Settings
  • Sinusoidal signal output function
  • Data logging function

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PR231 Precision Multifunction Calibrator

The PR231 series products have excellent performance indicators, numerous practical functions and powerful human-computer interaction capabilities. The product covers two accuracy levels of 0.01 and 0.02. The measurement and output circuits are completely isolated. In addition to the common functions of the common two-channel calibrator, it also has the functions of p-value measurement and standard temperature measurement.

Basic Parameters

Weight : 990g charging source : 100~240V AC,50~60Hz
Dimension : 225mm*130mm*53mm Working temperature : -10℃~50℃
Cell type : 7.4V 4400mAh, Rechargeable lithium battery Working time : ≥20 hours(24V power off)
Preheating time : 10 minutes after preheating Humidity : 0~80%,Non condensing
Charging time : 5 hours Calibration period : 2 years


Performance Index 

1.Basic parameters of measurement:

Function Range Measurement range Resolution 0.01 accuracy 0.02 accuracy Remarks
Voltage 100mV -5mV~120mV 0.1uV 0.005%RD+5uV 0.015%RD+ Input impedance
5uV ≥80mΩ
1V -50mV~1.2V 1uV 0.005%RD+ 0.015%RD+  
10V -0.5V~12V 10uV 0.005%FS 0.005%FS Input impedance
50V -0.5V~50V 0.1mV     ≥1mΩ
Current 50mA -5mA~50 mA 0.1uA 0.005%RD+0.005%FS 0.015%RD+ Internal resistance =10Ω
Ohm 50Ω 0Ω~50Ω 0.1mΩ 0.005%RD+5mΩ 0.015%RD+ Output 1mA current
500Ω 0Ω~500Ω 1mΩ 0.005%RD+0.005%FS 0.015%RD+
5kΩ 0kΩ~5kΩ 10mΩ 0.005%FS Output 0.1mA current
Thermal couple S、R、B、K、N、J、E、T、EA2、Wre3-25、Wre5-26 0.1℃ / According to ITS-90 scale
Cold end compensation Internal -10℃~60℃ 0.01℃ 0.5℃ 0.5℃
External 0.1℃ 0.1℃
Thermal  Pt10、Pt100、 Pt200、Cu50、Cu100、BA1、BA2、JPt100、 Pt500、 Pt1000 0.01℃ /
Standard temperature S、R、B、T、SPt25、SPt100 0.01℃ / Need to enter the correction value
ρ-value 50S 0.001%~99.999% 0.00% 0.01% 0.01% Input pulse width amplitude range:1V~50V
Frequency 10Hz 0.001Hz~12Hz 0.001Hz 0.01%FS 0.01%FS
1kHz 0.00001kHz~ 0.01Hz
1.2 kHz
100kHz 0.01kHz~ 10Hz 0.1%FS 0.1%FS
120 kHz
Temperature difference S、R、B、K、N、J、E、T 0.01℃ / Need to enter the correction value
SPt25、SPt100 0.001℃


2.Basic parameters of the output function:

Function Range Measurement
Resolution 0.01 accuracy 0.02 accuracy Remarks
Voltage 100mV -20mV~120mV 1uV 0.005%RD+5uV 0.015%RD+5uV Maximum load current =2.5mA
1V -0.2mV~1.2V 10uV 0.005%RD+0.005%FS 0.015%RD+0.005%FS
10V -2V~12V 0.1mV
Current 30mA -5mA~30 mA 1uA 0.005%RD+0.005%FS 0.015%RD+0.005%FS Maximum load voltage =24V
Ohm 50Ω 0Ω~50Ω 0.1mΩ / According to ITS-90 scale
500Ω 0Ω~500Ω 1mΩ
5kΩ 0kΩ~5kΩ 10mΩ
Thermal couple S、R、B、K、N、J、E、T、EA2、Wre3-25、Wre5-26 0.1℃ /
Thermal Pt10、Pt100、 Pt200、Cu50、Cu100、BA1、BA2、JPt100、 Pt500、 Pt1000 0.01℃ /
Frequency 10Hz 0.001Hz~ 0.001Hz 0.01%FS 0.01%FS Maximum load current =2.5mA
/ Pulse 12 Hz
  1kHz 0.00001kHz~  
  1.2 kHz 0.01Hz
  100kHz 0.01kHz~120 kHz 10Hz 0.1%FS 0.1%FS
Precision temperature control S、R、B、K、N、J、E、T 0.01℃ /
24V output Maximum voltage error: 0.3V   Ripple noise:35mVp-p(20MHz bandwidth)
Maximum load current:70mA  Load regulation: 0.5%(10% -100% load change)







1. Measuring function terminal area (withstand 100V DC voltage input error)

2. Output function terminal area(withstand 36V DC voltage input error)

3. Dust cover

4. Side band(length adjustable )

5. Holder

6. External Pt100 Reference point sensor interface

7. USB2.0 communication interface

8. Multi-function port (With RS232 communication, USB communication, isolated 24V voltage output, precision temperature control signal output, pressure calibration, and other functions)

9. Reset                                         

10. Supply hub(Connect the external AC power adapter)

11. Equipment nameplate                          

12. Battery13.Protective tube                                

14.Screen contrast adjusting knob

15.Battery port


a.Adjust length here

b.Unfold jacket toward this direction

c.  Holder unfold direction