Number of channels | 4 thermocouple channels, 1 internal autozero channel, 1 internal cold-junction compensation channel |
ADC resolution | 24 bits |
Type of ADC | Delta-Sigma |
Sampling mode | Scanned |
Voltage measurement range | ±80 mV |
Temperature measurement ranges | Works over temperature ranges defined by NIST (J, K, T, E, N, B, R, S thermocouple types) |
Conversion time | 70 ms per channel; 420 ms total for all channels including the autozero and cold-junction channels |
Common-mode voltage range |
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Channel-to-COM | ±1.5 V | COM-to-earth ground | ±250 V |
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Common-mode rejection ratio (0 Hz to 60 Hz) |
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Channel-to-COM | 95 dB | COM-to-earth ground | >170 dB |
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Input bandwidth (-3 dB) | 15 Hz |
Noise rejection (at 50 Hz and 60 Hz) | 85 dB minimum |
Overvoltage protection | ±30 V between any input and COM |
Differential input impedance | 20 MΩ |
Input current | 50 nA |
Input noise | 1 μV RMS |
Gain error (at -40 °C to 70 °C) | 0.06% typical, 0.1% maximum |
Offset error (with autozero channel on) | ±15 μV typical, ±20 μV maximum |
Gain error from source impedance | Add 0.05 ppm per Ω when source impedance >50 Ω |
Offset error from source impedance | Add ±0.05 μV typical, ±0.07 μV maximum per Ω when source impedance >50 Ω |
Cold-junction compensation sensor accuracy |
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0 °C to 70 °C | ±0.6 °C typical, ±1.3 °C maximum | -40 °C to 70 °C | ±1.7 °C maximum | MTBF | 633,012 hours at 25 °C; Bellcore Issue 2, Method 1, Case 3, Limited Part Stress Method |
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