Free DAQ tools
A viewer for TDMS, HDF5, MAT and Parquet files, and six calculators for sampling, resolution, current loops and temperature sensors.
Data file viewer for TDMS, HDF5, MAT and Parquet
Plot channels from NI TDMS, HDF5, MATLAB .mat (v4 to v7.3), Parquet and CSV files in the browser, read their properties and export channels to CSV.
File viewerDAQ file size calculator
Data rate and file size of a recording from its channel count, sample rate and length, stored as raw integers, float32, float64 or CSV.
CalculatorSample rate and aliasing calculator
Find where an undersampled signal shows up (900 Hz sampled at 1 kS/s reads as 100 Hz), or the per-channel and aggregate rate a multiplexed DAQ needs.
CalculatorADC resolution calculator
LSB size and ideal SNR for any bit count and range (305.2 µV and 98.08 dB for 16 bits on ±10 V), plus noise-free bits once you enter the datasheet noise.
Calculator4–20 mA calculator
Convert between loop current, shunt voltage and process value, check NAMUR NE 43 status, and see whether a 21 mA failure signal still fits your DAQ input range.
CalculatorThermocouple calculator
Convert thermocouple millivolts to temperature and back for types K, J, T, E, N, R, S and B, with cold junction compensation, using the NIST ITS-90 equations.
CalculatorRTD calculator
Convert Pt100, Pt500 and Pt1000 resistance to temperature and back with the IEC 60751 Callendar-Van Dusen equation, and see sensitivity, 2-wire lead error and class tolerances.
CalculatorMore on the blog
The calculators pair with longer guides: how fast to sample, thermocouple measurement, 4–20 mA loops, ADC resolution vs accuracy and choosing a file format for test data.