Additel 221A Multifunction Temperature Calibrator User Manual - Manual (Page 17)

________________________________________________________________________________________________________________
10
Pulse 0 to 999999 1 N/A
Limit Switch If the switch has detective voltage, its range is +3V to +24V
Note 1: When ambient temperature is (‐10 to 15℃and 25 to 50℃), temperature coefficients are:
(1) Voltage, current measurement: ±(0.001%RD＋0.0015%FS) /℃.
(2) 2‐wire, 3‐wire, 4‐wire resistance measurement: ±(0.002%RD＋0.001%FS)/℃.
Note 2: Input features:
(1) Voltage measurement: input impedance>1MΩ, overvoltage of ports is ±300VDC.
(2) Current measurement: input impedance<10Ω, overvoltage of ports is ±1A DC.
(3) Frequency、pulse measurement: Input impedance>500MΩ, square wave, low‐level voltage <0.3V, high‐level
voltage>2V, duty cycle is from 20% to 80%, overvoltage of ports is ±30VDC.
(4) Resistance、RTD measurement: Measuring current is about 0.7mA at 400Ω range, and about 0.3mA at 4000Ω
range, overvoltage of ports is ±30VDC.
(5) Thermocouple、RTD measurement temperature: To be decided by the accuracy of mV measurement, resistance
measurement, according to the 90 International temperature scale.
(6) Range of cold junction automatically compensation: ‐10 to 50℃, accuracy: ±0.1℃, calibration is available.