Woelke ME 102 wow and flutter meter schematic diagram request

User question

looking for a schematic diagram for the wow and flutter meter Woelke me 102

Artificial Intelligence Response

Direct answer to the question

• The most reliable place to obtain a schematic for the Woelke ME 102 series is Radiomuseum. The ME 102 C model page explicitly offers a “Schematics” tab; you can request the pages free of charge (guest downloads are limited per day). (radiomuseum.org)
• If your unit is the earlier “ME 102 B/BC,” closely related material is also cataloged on Radiomuseum; if the exact B/BC page is elusive, start from the ME 102 C entry and browse the Woelke model list. (radiomuseum.org)
• For cross-reference and repair context, the later Woelke ME‑108 wow‑and‑flutter meter service manual is available at Elektrotanya (useful for typical Woelke discriminator, limiter, and meter-driver topologies). (elektrotanya.com)

Key points

• Radiomuseum: request ME 102 C schematic via the “Schematics” tab (guest download). (radiomuseum.org)
• Consider ME‑102B/BC pages and adjacent Woelke models for partial/compatible circuitry. (radiomuseum.org)
• Elektrotanya: ME‑108 service manual as a close relative for topology and parts naming. (elektrotanya.com)

Detailed problem analysis

• Model identification matters. “ME 102” circulated in B/BC and C/CE variants. Circuit blocks (input limiter, FM demodulator/discriminator or PLL, weighting filters per DIN/IEC/NAB/JIS, rectifier/meter driver, internal 3.15 kHz oscillator) are common across the family. If you cannot find the exact suffix, the ME 102 C schematic and the ME‑108 service manual together typically provide >90% of what you need to service power, limiter, filter, and meter sections.
• Radiomuseum’s ME 102 C page confirms availability of a schematic and photographs. The site’s request workflow is straightforward (see Practical guidelines below). (radiomuseum.org)
• For repair without the exact drawing:
  • Power supply rails: Most Woelke instruments from this era use regulated ±12 V or ±15 V rails; verify rectifier, regulators, and electrolytics first.
  • Limiter/trigger: A hard‑limiting preamp removes AM, preserving FM (speed) information.
  • Demodulator: Either a pulse‑count or PLL discriminator generates a baseband “speed error” voltage.
  • Weighting networks: Switchable filters shape the measurement band (DIN/IEC etc.) before rectification and the panel meter.
  • ME‑108 documentation shows Woelke’s later implementation of these same blocks; while component values differ, troubleshooting approach carries over. (elektrotanya.com)

Current information and trends

• As of December 12, 2025:
  • Radiomuseum still lists the Woelke ME 102 C with schematic access via the “Schematics” tab and notes the 3150 Hz test frequency and panel layout. (radiomuseum.org)
  • HiFi Engine remains a large manual repository, but registration can be restricted or temporarily closed; it’s not guaranteed you can sign up on short notice. If you already have an account, it’s worth checking for ME 102 C documentation, but plan a fallback. (hifiengine.com)
  • For alternate reference, the ME‑108 service manual is downloadable on Elektrotanya. (elektrotanya.com)
  • The current Woelke GmbH is an industrial instrumentation company focused on weather-technical equipment; they are not known to provide legacy audio test-equipment service data. (woelke-gmbh.eu)

Supporting explanations and details

• Why ME‑102C material helps: Woelke reused proven building blocks across the ME series. Even if control labeling changed, the limiter, FM demodulator, and weighting sections are architecturally similar—use value and topology to correlate.
• If the analog panel meter pegs or stays dead:
  • Check supply rails at the meter driver IC/transistor.
  • Inject a known 3.15 kHz signal, verify clean limiting (near 50% duty) at the discriminator input.
  • Trace the weighted AC output to the rectifier and the meter.

Ethical and legal aspects

• Respect rights and site terms. Radiomuseum explicitly permits personal-use downloads on a quota; do not redistribute their scans. (radiomuseum.org)
• Many manuals are under copyright; sharing outside permitted use (e.g., reposting HiFi Engine or Radiomuseum PDFs) may violate terms. (hifiengine.com)

Practical guidelines

• How to get the schematic from Radiomuseum (fastest path):
  1. Open the ME 102 C page on Radiomuseum. Click “Schematics.” (radiomuseum.org)
  2. As a guest, request the schematic pages; RM emails you the files. Note the per‑day quota (plan multiple days if needed). Community guidance confirms the guest-download workflow. (radiomuseum.org)
  3. If your unit is ME 102 B/BC, browse “All listed radios etc. from Technisch Physikalisches Laboratorium, Woelke…” from the same page and check adjacent model entries (B/BC). (radiomuseum.org)
• Cross-reference set:
  • Elektrotanya: download “WOELKE ME‑108 WOW‑AND‑FLUTTER‑METER” service manual; use its block-level diagnostics to supplement the ME 102 schematic. (elektrotanya.com)
• If you’re repairing now and waiting for docs:
  • Recap power supply electrolytics first; check for shorted tantalums on rails.
  • Verify limiter symmetry with a scope; correct clipping ensures accurate FM demodulation.
  • Confirm the internal 3.15 kHz oscillator amplitude and frequency before adjusting any discriminator or weighting alignment.

Possible disclaimers or additional notes

• The exact “ME 102” (no suffix) may have production revisions. Expect minor value or connector differences vs. the C/CE documentation.
• Avoid turning internal presets until you have the alignment procedure; these meters require a stable 3.15 kHz reference for calibration.

Suggestions for further research

• If Radiomuseum’s quota slows you down, ask in specialist forums for Woelke owners who can confirm the exact variant and share alignment notes (not the scans) to guide you.
• Check museum collections and university archives that hold German audio measurement equipment; they sometimes provide photocopies on request.

Brief summary

• Start with Radiomuseum’s ME 102 C page and request the schematic via the “Schematics” tab; it’s the most direct route. (radiomuseum.org)
• Use the ME‑108 service manual from Elektrotanya as a technically consistent reference while you wait. (elektrotanya.com)
• If you confirm your exact variant (B, BC, C, CE), I can map test points and likely faults to the correct sections and suggest a calibration plan.

To tailor this precisely: which exact model variant and symptom do you have (e.g., no deflection, pegged meter, unstable reading, no lock on 3.15 kHz)?

Disclaimer: The responses provided by artificial intelligence (language model) may be inaccurate and misleading. Elektroda is not responsible for the accuracy, reliability, or completeness of the presented information. All responses should be verified by the user.