Bender µP601 — documenting a working medical safety tester
Field notes on the Bender µP601 / µP 601-1 (B928161) medical electrical safety tester (IEC 601-1, DIN VDE 0751): menu tree, built-in DPN-240 dot-matrix printer, RS-232, no manual available.
Field notes on a Bender µP601 safety tester (rating plate µP 601-1,
part number B928161, variant IVM 429 D, front panel BENDER Medical
Division — µP SAFETY TESTER Model 601): a single-phase electrical safety
tester for medical devices according to IEC 601-1:1988 and
DIN VDE 0751-1:1990, built 1993 or later. Not part of the UNIMET range.
No manual, datasheet or service documentation for this device could be found online. Everything here was worked out from the outside, on a running unit.
What you will find here
- Identification and dating — the DS601 three-phase adapter datasheet as the only public trace, rating plate, dating to July 1993 or later
- Menu tree — both operating modes (IEC 601-1:1988 and DIN VDE 0751T1/90), screen by screen, with the verbatim self-test printout
- Built-in printer — Datamega
DPN-240-24-S105panel printer, 24 columns, ribbonDPN-290-SW(equivalent to EpsonERC-21), repair of the disintegrated ribbon drive roller - Power-on behaviour — the tester checks which pin of its own mains plug carries the phase
- Battery compartment — leaked 2 × AA cells; the clock is lost, the ~69 stored test records survived
- RS-232 — DB-25,
V.24/RS-232C, 4800 baud: plan for capturing test reports digitally
The short story
The unit was bought used and works. Since no documentation exists, the goal is not a repair but to record everything the device does before it is ever opened — every working state is an original that exists only once. The next step is to find out whether the RS-232 port sends the printed reports on its own.
Do you have a manual, interface description or service documents for the Bender µP601 / µP 601-1? Please open an issue.
Documents (German)
| Document | Content |
|---|---|
| Status | start here — identification, history, sources |
| Functional survey | front and rear panel, rating plate, power-on, printer |
| Menu tree | screen by screen, self-test printout |
| Battery | corrosion, clock without backup |
| RS-232 capture | draft: reading test reports via the serial port |
| Sources | where to get the manufacturer documents |
Manufacturer documents are not published here (copyright).
Related: Bender UNIMET 1000 ST — teardown & reverse engineering (a different, PC-based Bender tester).
Source: github.com/feiglein74/bender-model-601 · License: CC BY-SA 4.0 for own content, see LICENSE.