Metex M 4650cr Pdf 12 Hot ((hot)) Jun 2026
: If the multimeter case feels warm to the touch during normal DC voltage testing, it typically implies a shorted zener diode, a blown voltage regulator rail, or a failing power supply section on the double-sided PCB board. Step-by-Step Diagnostic Check for a "Hot" or Drifting Unit
The hardware is designed for benchtop accuracy in a handheld form factor. Also rebranded historically as the Voltcraft M-4650CR, it stands out for its high input impedance and legacy data logging:
| Specification | Details | |---|---| | Manufacturer | Metex Corporation, Seoul, South Korea | | Model | M-4650CR | | Year of Release | 1990 (approx.) | | Display | 4½-digit LCD, max reading 19999, with 41-segment analog bar graph and function indicators | | Size (W x H x D) | 85 x 180 x 40 mm (3.3 x 7.1 x 1.6 inches) | | Weight | 0.4 kg (0.881 lbs) | | Power Supply | 1 x 9V battery | | Input Impedance (Voltage) | 10 MΩ |
To interface the M-4650CR with a PC:
Stable on all DC voltage ranges (specified on Page 12 of the manual). Protection Includes a spark gap and 2A glass fuse for current inputs. Common Measurements metex m 4650cr pdf 12 hot
If input impedance remains incorrect, the meter may require professional calibration. Metex M-4650CR
| Model | Max Current | Hot-Swap Safety | PDF Availability | | :--- | :--- | :--- | :--- | | | 10A (continuous with thermal shutdown) | CAT IV 600V | Excellent | | Brymen BM869s | 20A (30 sec on/off) | CAT IV 1000V | Excellent | | UNI-T UT61E | 10A (15 sec max) | CAT III 1000V | Good | | Metex M-4650CR (vintage) | 20A (see manual) | CAT II (assumed) | Hard to find |
Page 2. M4650CR/M4630CR Familiarization. 1. LCD, (4% Digit; Max 9999) with 41 point bar graph. 2. Power on-off switch (auto power- Mikrocontroller.net metex - Mikrocontroller.net
The METEX M 4650CR is a digital multimeter designed for measuring various electrical parameters. This report focuses on the "PDF 12 Hot" feature of the METEX M 4650CR, which relates to its functionality in measuring and displaying data in a specific mode. : If the multimeter case feels warm to
You can find the technical documentation and service manuals at these sources: Operating Manual (PDF): Available on Mikrocontroller.net Service Manual & Schematics: Detailed internal circuits and parts lists can be found on Elektrotanya Internet Archive ⚙️ Key Specifications Range / Detail Accuracy (Approx.) 20,000 (4.5 digit) DC Voltage 200mV to 1000V AC Voltage 200mV to 750V 2mA to 20A DC: 0.3% / AC: 0.8% Resistance 200Ω to 20MΩ Capacitance 2000pF to 20μF Up to 200kHz Connectivity RS232 (Bi-directional) Data logging to PC 🛠️ Notable Features Analog Bargraph: A 41-segment display for visualising rapid signal changes. Advanced Modes: Includes Data-Hold, Max/Min memory, and Relative offset. Logic Test: Built-in capability to test digital logic levels. Protection:
If you are reading this article and need the manual immediately, a quick search for the following terms will reliably lead you to the download links mentioned above: or "Metex M4650CR schematic download."
In this article, we will break down exactly what the Metex M 4650CR is, what the “12” likely refers to, why “Hot” matters in a bench multimeter context, and most importantly—where you can legally and safely obtain the service manual, user guide, and schematics in PDF format.
The core measurement IC is often a rebranded ICL7129CPL (40-pin DIP). Protection Includes a spark gap and 2A glass
According to the official spec sheet on page 12, the meter maintains a .
Long-term users have reported calibration drift over decades, often fixed by adjusting internal trimmers.
Spray the rotary function switch contacts with a high-quality electronic contact cleaner (such as DeoxIT).
