TestBench Viewer by TECHSENSE

TestBench Viewer reads NI TDMS measurement files on iPhone and iPad and shows what is inside them: every segment, group and channel, with the properties the acquisition wrote. Page through a channel's samples in a table, plot it as a zoomable chart, export to CSV or xlsx, and correct a value right in the file. WHAT A TDMS FILE LOOKS LIKE HERE • Summary first: sample count, file size, TDMS version, segment count, group and channel totals • Channel properties as written — unit_string, wf_increment, wf_start_offset and anything custom • Interleaved and big-endian segments, and index reuse across segments, decoded natively • A .tdms_index sidecar next to the file makes multi-gigabyte logs open in seconds TABLE, CHART, GRID • Channel table that pages through millions of samples without loading them all • Waveform chart with pinch-zoom and pan; min/max decimation keeps every spike visible • Min, max, mean and RMS of the whole channel, with the index where each extreme occurs • All channels of a group side by side, spreadsheet style; select cells to chart them as line, area, points or bars — or several at once EDIT WITHOUT RISK • Fix a sample in place: only that value's bytes change, the rest of the file stays bit-identical • Undo pending edits, or save as a copy and leave the original measurement alone • Values that would not fit the channel's type are refused, never rounded EXPORT • CSV of selected channels, with properties and a time column if you want them • xlsx with one worksheet per group, ready for Excel or Numbers ON IPAD • Library, file outline and channel side by side; the grid's chart updates as you select • Hardware keyboard shortcuts, two files in two windows, drag charts and cells into other apps • Mark up a chart with Apple Pencil and export a one-page PDF report Files stay on your device. The app makes no network requests, collects no data and needs no account. English, Korean and Simplified Chinese. TDMS is a file format of National Instruments (NI). TestBench Viewer is an independent app and is not affiliated with or endorsed by NI. From TECHSENSE — makers of SQLite Viewer by TECHSENSE and DBF Viewer. More at testbench.tools