777966-21

National Instruments

777966-21

National Instruments

Description

The 777966-21 NI SCXI-1521 is a 24-channel, 350-Ohm Quarter-Bridge Strain Input Module by National Instruments, featuring a 10 Hz, 2-pole Butterworth filter and programmable excitation levels from 0-5V. Equipped with onboard calibration EEPROM and precise shunt calibration resistors, this module ensures accurate measurements for high-channel-count applications.

The 777966-21 NI SCXI-1521 is a 24-channel, 350-Ohm Quarter-Bridge Strain Input Module by National Instruments. Designed for high-channel-count applications, this module can multiplex its signals into one channel of the controlling DAQ instrument, with the option to add more modules for additional channels. It features a 10 Hz, 2-pole Butterworth filter for lowpass filtering to ensure precise measurements, and allows for programmable excitation levels from 0-5V. Each of the analog input channels is equipped with circuitry to eliminate bridge offset voltage, with driver software that can null the offset voltage to zero in seconds. The onboard calibration EEPROM saves calibration constants for each channel, which can be used to adjust for gain and offset errors. The module also includes precise shunt calibration resistors on each channel to simulate loading effects on the strain gauge. Despite being announced as obsolete by National Instruments, the SCXI-1521 module is still available for purchase and repairs through companies like Apex Waves.

Made By National Instruments
Part Number 777966-21
Application Ideal for high-channel-count applications; for Quarter-Bridge Strain measurements
Channel Count 24 analog input channels
Filtering 10 Hz, 2-pole Butterworth filter
Excitation Levels Programmable over 1,024 levels from 0-5 V

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Question:

What is the National Instruments model 777966-21 used for?

Answer:

The National Instruments model 777966-21, also known as the NI SCXI-1521, is a 24-channel, 350-Ohm Quarter-Bridge Strain Input Module designed for high-channel-count strain measurement applications.

Question:

How many channels does the NI SCXI-1521 have, and what is its primary function?

Answer:

The NI SCXI-1521 has 24 channels and is primarily used to multiplex signals into one channel of the controlling Data Acquisition (DAQ) instrument, with the capability of expanding channels by adding more modules.

Question:

What type of filter is used in the 777966-21 and what is its purpose?

Answer:

The 777966-21 features a 10 Hz, 2-pole Butterworth filter for lowpass filtering to ensure precise, noise-free measurements.

Question:

How does the 777966-21 module handle bridge offset voltage and calibration?

Answer:

The 777966-21 module is equipped with circuitry to eliminate bridge offset voltage and includes driver software to null the offset voltage to zero. It also has an onboard calibration EEPROM to save calibration constants for each channel to adjust for gain and offset errors.

Question:

Is the 777966-21 module still available for purchase despite being announced as obsolete?

Answer:

Yes, although the 777966-21 module has been announced as obsolete by National Instruments, it is still available for purchase and repairs through third-party companies like Apex Waves.