National Instruments SCXI-1327 High-Voltage Attenuator Terminal Block

The SCXI-1327 (Part Number: 777687-27, 185136A-01) shielded Terminal Block has 18 screw terminals that can attach to the following module’s input connector: SCXI-1120, SCXI-1120D, SCXI-1121, SCXI-1125, or SCXI-1126. The user must bypass the attenuators on the excitation channels for accurate operation with the SCXI-1121. The SCXI 1327 can extend the input range of the SCXI-1120/D and SCXI-1121 to ±250 V. This Terminal Block can additionally extend the threshold level of the SCXI-1126 module from 5 V all the way to 300 V. There are switches in the NI SCXI-1327 which allow or disallow the extended input voltage range separately for each channel. The SCXI-1327 also decreases the input impedance of the user’s SCXI module to 1 M.

NI software has the capability to change a thermistor voltage to the thermistor temperature for the NI SCXI 1327 Terminal Block. LabVIEW can be used for this purpose; in the Data Acquisition and Signal Conditioning palette, there is a Convert Thermistor Reading VI available. However, if the user is utilizing CVI or NI-DAQ instead, they can use the Thermistor_Convert function. Then, the VI will take the output voltage of the temperature sensor, the reference voltage, and the precision resistance to output the thermistor temperature.

The SCXI-1327 Terminal Block can also be calibrated. This Terminal Block should be calibrated once a year or more frequently if the user’s application is demanding. If the model is calibrated once a year, then it will still meet the measurement preciseness standards. If the NI SCXI-1327 is not performing within specifications, then it may require repair.

The SCXI-1327 is run using the NIDAQmx driver software which can be programmed using software packages/application development environments (ADEs) such as LabVIEW or LabWindows/CVI. The NI device weighs 7 oz, and measures 7.0 x 3.125 x 1.2 in. in physical dimensions. It has recommended operating and storage temperature ranges of 0 to 50 °C and –20 to 70 °C respectively, and a non-condensing humidity range of 5 to 90%.

SCXI-1327 Obsolete Status has been announced by National Instruments, but the Terminal Block will still be available for purchase and repairs by Apex Waves. 

The SCXI-1327 is available to be calibrated. While the recommended calibration period for individual parts varies, most parts should be calibrated either annually or every two years to ensure accuracy. If you need the SCXI-1327 calibrated, Apex Waves provides options. We offer high-quality NIST accredited calibrations through a 3rd party, with an average turnaround time of 1 to 2 weeks. When you order the SCXI-1327 with us, you can request basic (unaccredited) in-house calibration that will calibrate the part to the manufacturer specifications prior to being shipped. Call or email us today for more information about calibrating the SCXI-1327!