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U2351A Datasheet(PDF) 17 Page - Keysight Technologies |
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U2351A Datasheet(HTML) 17 Page - Keysight Technologies |
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17 / 25 page  17 Thermocouple input mode In thermocouple input mode, the U2802A can acquire up to ±100 mV input signals. Each channel includes an instrumentation amplifier and a 4 Hz low-pass filter. The low-pass filter removes unwanted noise from the thermocouple wires to obtain accurate measurement data. Voltage input mode Alternatively, you can select separate voltage input modes for each channel. The channel will be set to bypass the amplifier and filter, allowing up to ±10V input signals to be directly routed to the DAQ device analog input. The bandwidth in this mode is more than 500 kHz. Zero mode In zero mode, the positive and nega- tive inputs of the instrumentation amplifier are shorted together. The voltage measured in this mode corresponds to the offset voltage of the channel. You can subtract this offset voltage from subsequent thermocouple mode measurements to increase measurement accuracy. This mode is only applicable in thermo- couple mode. Thermocouple compatibility The U2802A is compatible with a wide range of standard thermo- couple types defined in the NIST ITS-90 Thermocouple Database. This includes types J, K, R, S, T, N, E, and B. Open thermocouple detection The U2802A includes open ther- mocouple detection circuitry to indicate the presence of an open thermocouple. Calibration EEPROM The U2802A gain and offset calibra- tion factors for each channel are stored in the EEPROM during fac- tory calibration and can be retrieved prior to taking measurements. This on-board EEPROM also stores the module ID, serial number, and date of calibration for your reference. A sec- tion of the EEPROM is also allocated for you to save your calibration data. Restoring factory calibration Using the AMM software, you can easily restore the U2802A calibration data from your settings to the original factory settings. 17 |
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