Module spare parts TNA1-TU01-SH

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Product Description

Product Description
Focus on DCS, PLC, robot control system and large servo system.
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TNA1-TU01-SH

In general, to provide optimum measurement resolution and noise rejection, you can select as high a gain as will not cause the output to exceed this limit. However, total harmonic distortion (THD) increases at higher output levels, especially at higher input frequencies. If THD is of significant concern in a given application, a lower gain (one or two steps lower) may be more appropriate. Correcting Gain and Offset Errors The input amplifiers have intrinsic errors in their gains and in their DC offsets. To compensate for the gain errors, calibration constants are stored in the EEPROM for each gain and for each channel. These constants contain the adjustment factors used to correct for the gain errors. If you are using NI software, these constants are read automatically from the EEPROM and the appropriate correction factor is applied when the raw data is scaled to a voltage. Gain errors are determined and calibration constants are loaded into the EEPROM at the factory. However, gain errors drift with temperature changes. You can add an additional set or subset of calibration constants to the EEPROM to optimize performance under a specific set of conditions. Details of this procedure are given in Chapter 5, Using the SCXI-1141/1142/1143 Module. To account for offset errors, you can configure the module to send a 0 V differential signal through the amplifiers. The signal at the output represents the DC offset error and should be read and subtracted from all subsequent readings. Before reading this offset error on a channel, either set the filter to bypass mode or allow it to settle for several seconds. Average several readings to minimize noise errors. This procedure is called calibration. Because the offset voltage changes with each gain, you should perform a new calibration each time the gain is changed. Offset errors also drift with changes in temperature, so you should update the offset correction periodically. Measurements made during the warm-up period of the module (approximately 20 minutes) and chassis are most susceptible to drifting offset errors.