ISKRIT / Laboratory & metrology / QC · Shewhart charts
Laboratory & metrology
Internal laboratory quality control and Shewhart control charts for accredited laboratories
The tool builds Shewhart control charts from result series, checks eight out-of-control criteria, and computes the repeatability limit from duplicate pairs. Built for internal laboratory quality control.
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Free, no sign-up · interface in Russian
Standards
Charts per GOST R 50779.42 (ISO 8258), repeatability per GOST R ISO 5725, procedure per RMG 76.
Input
Result series, or pairs of duplicate determinations.
Output
Charts, verdict on the criteria, repeatability limit.
What it does
- X̄-R, X̄-S, and individuals X-mR charts
- Automatic checks of the eight special cause criteria
- Repeatability limit r from duplicate pairs
- Control limits from GOST coefficients
Free and full version
Free
0 ₽
- Code-based calculations with no run limits
- Input validation and printable results
- Works instantly, no sign-up required
Full version
On request
- Store methods and series
- Export charts and reports to XLSX
- Import series from Excel
- Control history per method
Questions
Which charts are supported?
Means charts based on ranges and on standard deviations, range charts, standard deviation charts, and individuals X-mR.
Is repeatability calculated?
Yes, r = 2.77·s_r from duplicate pairs, with a verdict for each pair.