UNC-825J Universal Industrial Signal Calibrator

The UNC-825J is a precision calibrator that covers the generation and mesurement of most industrial signals in one compact and easy to use instrument. It has a big backlit display and is suitable for the field as well as the lab with its accuracy of 0.02% of span.

• Measures and Sources:
  • frequency, pulse counting,
  • thermocouples,
  • Resistance Temperature Detectors (RTD’s),
  • resistance,
  • milliamps, two wire loop simulation,
  • millivolts and Volts
• Two separate channels displayed.
  • The upper display shows measured values.
  • The lower display shows measured or sourced values.
• · Calibration functions
• · Auto ramping and auto stepping
• · Manual and automatic cold junction compensating
• · Clear function
• · Temperature unit switching
• · Auto flashing jacks
• · Backlit LCD
• Battery gauge

You can set it to any value using the up down buttons or set it to automatically step or ramp between values.

Complete with test leads, usb charging lead and carry case.

The UNC-825J is delivered with a factory calibration certificate that shows the measured errors on all ranges.

Below are the detailed performance specifications of this precision, cost effective, robust and reliable calibration tool

DC Current Measurement and Source

• Measurement:
  • 0-24 mA dc: Accuracy ±0.02%
• Source:
  • 0-24 mA dc: Accuracy ±0.02%

DC Measured Voltage Range and Max Error

• 0~100) mVDC  (Upper display):  ±0.02%
• (0~30) VDC  (Upper display): ±0.02%
• (0~100) mVDC (Lower display): ±0.02%

DC Sourced Voltage:

• (0~20) VDC (Lower display): ±0.02%
• (0~100) mVDC: (Lower display): ±0.02

Resistance Measurement

• Range  and Accuracy
  • 4-wire method
    • 0~400 Ω: ±0.1 Ω
    • 400~1500 Ω ±0.5 Ω
    • 1500~3200 Ω ±1.0 Ω
  • 2 and 3-wire methods.Note 3-wire: Assumes matched leads with a total resistance not exceeding 100Ω.
    • 0~400 Ω: ±0.15 Ω
    • 400~1500 Ω ±1.0 Ω
    • 1500~3200 Ω ±1.5 Ω
  • Excitation Current: 0.5 mA

Resistance Source:

The instrument has solid state electronics which creates a precise resistance value and maintains it over a range of dc current values. The range of currents and accuracy are as follows:

• Range:15~400 Ω, Excitation: 0.15~0.5 mA, Accuracy: ±0.15 Ω
• Range:15~400 Ω, Excitation: 0.5~3.0 mA, Accuracy: ±0.1 Ω
• Range: 400~1500 Ω, Excitation: 0.05~0.8 mA, Accuracy: ±0.5 Ω
• Range:1500~3200 Ω, Excitation: 0.05~0.4 mA, Accuracy: ± 1.0 Ω
• Excitation Current:：0.5mA
• Note: for 3-wire source: Assumes matched leads with a total resistance not exceeding 100Ω.
• Resolution
  • (0~1000)Ω:  0.01Ω;
  • 1.0~3.2)kΩ: 0.1Ω

RTD Measurement:

• Range and Accuracy:
  • 4 Wire
    • Cu50 -50~150°C: ±1.2°C
    • Pt100 -200~800°C: ±0.6°C
  • 2 Wire / 3Wire
    • Cu50 -50~150°C: ±2.0°C
    • Pt100 -200~800°C: ±1.0°C
    • 3-wire: Assumes matched leads with a total resistance not exceeding 100Ω

RTD Source

The instrument has solid state electronics which creates a precise resistance value and maintains it over a range of dc current values. The range of currents and accuracy are as follows:

• RTD Type, Excitation current and Accuracy:
  • Cu50: (0.15~3.0)mA; ±1.2°C
  • Pt100(385), Pt100(3916), Pt200(385): (0.15~3.0)mA: ±0.6°C
  • Pt500(385): (0.05~0.80)mA: ±0.6°C
  • Pt1000(385): ±0.6°C

Thermocouple Measurement and Source

• J:   Range and Accuracy
  • -200~0°C: ±0.8°C
  • 0~1200°C: ±0.5°C
• K:   Range and Accuracy
  • -200~0°C: ±1.0°C
  • 0~1370°C: ±0.6°C
• T:  Range and Accuracy
  • -200~0°C: ±1.0°C
  • 0~400°C: ±0.6°C
• E: Range and Accuracy
  • -100~0°C: ±0.7°C
  • 0~950°C: ±0.5°C
• R: Range and Accuracy
  • -20~0°C: ±2.3°C
  • 0~500°C: ±1.6°C
  • 500~1750°C: ±1.2°C
• S: Range and Accuracy
  • -20~0°C: ±2.3°C
  • 0~500°C: ±1.6°C
  • 500~1750°C: ±1.3°C
• B: Range and Accuracy
  • 600~800°C: ±2.0°C
  • 800~1000°C: ±1.6°C
  • 1000~1800°C: ±1.2°C
• N: Range and Accuracy
  • -200~0°C: ±1.3°C
  • 0~1300°C: ±0.7°C
• Resolution:
  • J, K, T, E, N: 0.1℃
  • B, R, S : 1°C

Frequency Measurement

• 1~1100 Hz: ±0.05%
• 1.0~10.0 kHz: ±0.05%
• Sensitivity: not less than 1 V peak to peak using square wave

Frequency Source

• 1~1100 Hz: ±0.05%
• 1.0~5.0 kHz: ±0.05%
• Amplitude: 0~0.8 V peak to peak
• Load Drive capability: 3 mA

General Specifications

• Operating temperature: -10℃~55℃
• Storage temperature: -20℃~70℃
• Relative Humidity (％RH operating without condensation)
  • 90% (10℃~30℃)
  • 75% (30℃~40℃)
  • 45% (40℃~50℃)
  • 35% (50℃~55℃)
  • Uncontrolled: <10℃
• EMC: EN55022, EN55024
• Vibration: Random, 2g, 5 to 500Hz
• Shock Test: 30g, 11ms, half sine bow wave
• Power Requirement: 4 AA Ni-MH, Ni-Cd batteries
• Size: 215 mm x 109 mm x 44.5 mm
• Weight: Approx 500g