EMT 422 (1977)
The EMT 422 is a wow-and-flutter meter built by Elektromesstechnik Wilhelm H. Franz of Lahr, West Germany. It came out in 1977. It measures flutter and frequency inter-modulation (FIM) distortion on five ranges, from 0.1% to 10% full-scale deflection, and conforms to DIN/ANSI/IEC standards. Studio Sound (May 1977, p.49) called it “the new low cost EMT 422” and noted that three selectable filters allow a rapid initial analysis of flutter frequencies.
The front panel has two large meters, one for weighted peak values and one for slow speed deviation. The case is metal and measures 294 x 146 x 240 mm (11.6 x 5.7 x 9.4 inches).
Known specs:
- Five measurement ranges: 0.1% to 10% FSD (flutter and FIM)
- Three analysis filters for flutter frequency breakdown
- Separate meters for weighted peak and slow speed deviation
- Adjustable threshold for production quality determination
- Dimensions: 294 x 146 x 240 mm; metal case
- No sound reproduction output
Documentation is thin beyond these details. The Radiomuseum entry indicates 33 schematics are on file for the model, which suggests some technical support remains available for restoration. No original price, weight, or power requirements have surfaced.
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