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General Specifications - Altek 422
Accuracy: ±(0.008% of Reading + 0.006 mV)
Cold junction compensation: Built-in for specified thermocouple type, characterized to T/C curve
Cold junction temperature effect: Within 0.05° per °C change in ambient temperature over operating range
Operating temperature range: -5 to +140°F (-20 to +60°C)
Storage temperature range: -22 to + 175°F (-30 to +80°C)
Relative humidity: 10 to 90%, non-condensing
Zero stability: Included in Cold junction effect
Warm up time: 1 Minute to full rated accuracy
Overload protection: 120 volts AC/DC for 30 seconds on connecting leads, in any mode
Battery life: 9 Volt Alkaline: Nominal 40 hours Low battery: “BAT” indication on LCD at 7 Volts nominal, approximately 10 hours left.
Open thermocouple detection: 450 millisecond check pulse. Nominal threshold, 10 K Ohms. Displays “ — — — —” for open circuit
Normal mode rejection: 50/60 Hz, 50 dB Common mode rejection: 50/60 Hz, 120 dBReference drift: <10 PPM/°C
Overall size: 2 1/2 x 2 5/8 x 5 1/8 inches (63.5 x 66.7 x 130 mm)
Weight: 10.9 oz. (0.31kg)
Carrying case: Included, zippered with belt loop and shoulder strap
Thermocouple Simulator (Source)
Output impedance: <0.1 ohms
Source current: up to 8 mA (drives 80mV into 10 Ohms)
Output noise: <4 microvolts p-p for frequencies of 10 Hz or below
Overload: Indicates OVER and blanks digits on the display
Read a thermocouple
Input impedance: >10 Megohms
Normal mode rejection: 50/60 Hz, 50 dB
Common mode rejection: 50/60 Hz, 120 dB