Warranted specifications describe the performance of a model under stated operating conditions and are covered by the model warranty.
The following characteristic specifications describe values that are relevant to the use of the model under stated operating conditions but are not covered by the model warranty.
Specifications are valid at 23 °C unless otherwise noted.
All voltages are specified in DC, ACpk, or a combination unless otherwise specified.
Topologies |
1-wire 64 × 1 multiplexer 1-wire dual 32 × 1 multiplexer 2-wire 32 × 1 multiplexer 2-wire dual 16 × 1 multiplexer 4-wire 16 × 1 multiplexer Independent |
All input specifications are DC, ACrms, or a combination unless otherwise specified.
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Maximum total current (switching or carry) |
2 A |
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Minimum switch load[2] |
20 mV/1 mA |
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Differential thermal EMF |
2.5 μV, typical[4] <12 μV, maximum |
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Channel-to-channel DC leakage at 300 V |
500 GΩ |
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Relay operate time |
1 ms, typical 3.4 ms, maximum |
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You can use the PXIe-2527 and the TB-2627 to measure thermocouples. NI software can convert a thermocouple voltage to the thermocouple temperature. For example code, visit ni.com/examples, and enter PXIe-2527 in the Search field.
When measuring thermocouples, be sure to account for error in your measurements. The total error in thermocouple measurement is the sum of the system error (determined by the thermal EMF of the PXIe-2527 and the CJC temperature of the TB-2627) and the thermocouple error (determined by the type of thermocouple used).
To determine the system error for the PXIe-2527 and TB-2627, first calculate the error due to thermal EMF of the PXI-2527 using the following equation:
where[7]
After you have determined the error due to thermal EMF, calculate the system error using the following equation.
ES = EEMF + ECJC
where
Measuring a K-type thermocouple at 200 °C with a CJC temperature of 25 °C, the system error of the PXI-2527/TB-2627 is calculated below.[10]
Assuming typical thermal EMF (2.5 μV), first calculate the error due to thermal EMF using the following equation:
To determine the system error, add the error due to thermal EMF to the error due to the CJC temperature sensor using the following equation.
ES = 0.063 °C + 0.5 °C = 0.563 °C
Independent of the PXIe-2527/TB-2627 system, thermocouple error is the greater of the following values: ±temperature range or ±percent of the measurement.
In the example, a standard grade K-type thermocouple is used to measure 200 °C. The error for a standard grade K-type thermocouple is ±2.2 °C or ±0.75% of the measurement temperature.[11] Because ±0.75% of 200 °C (±1.5 °C) is less than ±2.2 °C, the error of a standard grade K-type thermocouple is ±2.2 °C.
The total error in thermocouple measurement is the sum of the system error and the thermocouple error. Use the following equation to determine the total error in thermocouple measurement:
ET = ES + ETh
where
To determine the total error in thermocouple measurement in the example, add the thermocouple error to the system error using the following equation:
ET = 0.56 °C + 2.2 °C = 2.76 °C
Assuming typical thermal EMF, the total error in thermocouple measurement at 200 °C for the PXIe-2527/TB-2627 with a K-type thermocouple is ±2.76 °C.
Relay type |
Electromechanical, non-latching |
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Relay contact material |
Palladium-ruthenium, gold covered |
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I/O connector |
100 position HDI right angle, male |
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Dimensions (L × W × H) |
3U, one slot, PXI/cPCI module 21.6 cm × 2.0 cm × 13.0 cm (8.5 in. × 0.8 in. × 5.1 in.) |
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Weight |
209 g (7.4 oz) |
Operating temperature |
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Storage temperature |
-20 °C to 70 °C |
Relative humidity |
5% to 85%, noncondensing |
Pollution Degree |
2 |
Maximum altitude |
2,000 m |
Indoor use only.
Operational Shock |
30 g peak, half-sine, 11 ms pulse (Tested in accordance with IEC 60068-2-27. Test profile developed in accordance with MIL-PRF-28800F.) |
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This product is designed to meet the requirements of the following electrical equipment safety standards for measurement, control, and laboratory use:
For UL and other safety certifications, refer to the product label or the Online Product Certification section.
For EMC declarations, certifications, and additional information, refer to the Online Product Certification section.
This product meets the essential requirements of applicable European Directives, as follows:
Refer to the product Declaration of Conformity (DoC) for additional regulatory compliance information. To obtain product certifications and the DoC for this product, visit ni.com/certification, search by model number or product line, and click the appropriate link in the Certification column.
NI is committed to designing and manufacturing products in an environmentally responsible manner. NI recognizes that eliminating certain hazardous substances from our products is beneficial to the environment and to NI customers.
For additional environmental information, refer to the Minimize Our Environmental Impact web page at ni.com/environment. This page contains the environmental regulations and directives with which NI complies, as well as other environmental information not included in this document.
At the end of the product life cycle, all NI products must be disposed of according to local laws and regulations. For more information about how to recycle NI products in your region, visit ni.com/environment/weee.