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📊 Overview: HAMEG HM203-7 Oscilloscope

Type: Analogue Dual-Trace Oscilloscope
Bandwidth: 20 MHz (-3 dB) typical, extends somewhat higher into the upper range of its trigger circuitry
Channels: 2 (dual trace display)
Display: Cathode-ray tube (CRT), ~8 × 10 cm visible screen with built-in graticule
Weight: ~6–7.5 kg depending on spec and panel layout
Power: AC mains (110–240 V depending on region)


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🔍 Key Technical Specifications

📈 Signal & Bandwidth

Vertical (Y) Bandwidth: DC to 20 MHz (-3 dB)

Rise Time: Around 17.5 ns

Input Sensitivity: 5 mV/div up to 5 V/div calibrated; up to ~1 mV/div uncalibrated

Input Impedance: 1 MΩ ∥ 25 pF

Maximum Input Voltage: ~400–500 V (DC + peak AC)


🧠 Trigger & Timebase

Trigger Types: Automatic & normal; internal channels, line, external source selectable

Trigger Bandwidth: Stable triggering up to ~30-40 MHz

Timebase Range: 0.2 μs/div to 0.1 s/div (various calibrated steps)

Sweep Magnification: x5 or x10 modes for faster sweeps


🛠 Modes & Features

Trace Modes:

Alternate – shows both channels in alternating sweeps

Chopped – interleaved display at slower time bases


X-Y Mode: Use one channel for X and one for Y for Lissajous and phase measurements

Component Tester: Built-in function to test semiconductors and components

TV Sync: Active TV sync separator for line/frame synchronising

Calibrator: 1 kHz square wave output for probe compensation



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📦 Physical & Practical Details

Dimensions: ~285 × 145 × 380 mm (W×H×D)

Display: CRT with internal graticule for measuring amplitude and time

Input Coupling: DC, AC, and ground options

Included Accessories (typical): 10:1 probes, mains cord, manual



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🛠 Typical Usage

This analogue oscilloscope is suitable for:

Educational labs and hands-on electronics training

Repair and troubleshooting of analog circuits

Classic gear enthusiasts or retro test benches


Because it’s analog, it’s great for seeing waveform shapes in real time without digital aliasing — but it lacks modern storage or digital interfaces common to current scopes.


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📜 Notes

The HM203-7 is often lauded for robustness and display stability in hobbyist and professional settings .

Its triggering circuitry can synchronise up to beyond its main 20 MHz bandwidth, aiding stable views on high-frequency inputs .



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