Agilent Technologies U2802A User Manual download pdf (Page 39)

U2802A

Product speciﬁcations

General characteristics

Number of channels 31 differential and 1 CJC

Input voltage range for voltage mode ±10 V (signal + common mode)

Input voltage (thermocouple mode) ±100 mV

Sampling rate for thermocouple mode 10 kSa/s total for all channels

Sampling rate for overall module 500 kSa/s

Thermocouple types J, K, R, S, T, N, E, and B

Input speciﬁcations

Accuracy (thermocouple mode)

Overall gain error

Overall offset error 

Nonlinearity

0.06% (23 °C ± 5 °C )

15 μV (without zeroing) (23 °C ± 5 °C )

6 μV (with zeroing)

< 0.005% of full scale range

System noise (rms)

Gain (× 1)

Gain (× 100)

100 μVrms

5 μVrms

Common Mode Rejection Ratio (CMRR)

Voltage mode

Thermocouple mode

> 60 dB

> 80 dB

Cold junction accuracy

±1.0 °C typical (23 °C ± 5 °C )

±1.5 °C typical (0 °C to 18 °C, 28 °C to 55 °C)

Input characteristics

Bandwidth (voltage mode) > 500 kHz

Bandwidth (thermocouple mode) 4.0 Hz

Overvoltage protection

[1]

TC Mode

[2]

Common mode: ±17 V (TC+ and TC– with respect to GND)

Differential mode: ±7 V (Differential voltage between TC+ and TC–)

Bypass mode

±20 V (TC+ input with respect to GND)

Power-off Mode

±11 V (TC+, TC– input with respect to GND)

Input impedance > 1 GΩ

Input bias current ±2.5 nA max

Input offset current ±1.5 nA max

Gain drift 60 ppm/°C max

Offset drift 1 μV/°C max

Filter cutoff frequency (–3 dB)

(thermocouple mode)

4.0 Hz

Filter type (thermocouple mode) Low Pass RC Filter

Other features

Recommended warm up time 30 minutes

[1]

The overvoltage protection levels speciﬁed above indicate the maximum voltage each input pin can tolerate without resulting in any damages.

However, prolonged exposure to these levels may affect device safety and reliability. Hence, it should be avoided where possible.

[2]

On the channels conﬁgured for thermocouple mode, the TC+ and TC– pins can tolerate up to ±17 V of differential voltage for a few minutes. However,

exceeding a voltage range of ±100 mV on these channels can cause additional current to be drawn from the device’s power supply regulators, which

may damage the device if multiple channels are overdriven for prolonged periods. This is the case when a voltage source is tied across the TC

+ and

– pin. Voltage sources greater than ±100 mV should be tied to TC

+ and GND (ﬂoating source), or TC

+ and TC

n+1

+ (grounded source), and have

the channels set for bypass mode.

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Agilent Technologies U2802A User Manual Page 39

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