Voltcraft Digital Panel Meter - PM-129
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Product Information
Full details
The Voltcraft PM-129 is a versatile LED digital panel meter designed for electronics hobbyists and engineers who require precise, custom-integrated voltage monitoring solutions. Offering a 200mV measurement range and 2000-count resolution, it serves as a reliable display unit for DIY laboratory power supplies, battery monitors, or diagnostic dashboards. While it is highly adaptable via external circuitry, users should note that the device requires basic knowledge of electronics, such as calculating series resistors or shunts, to scale the input for higher voltage or current measurements.
All features
| Model Part Number | PM-129 |
|---|---|
| Brand | VOLTCRAFT |
Extended Product Information
FAQs
What is the native measurement range of the PM-129?
The native range is 200mV DC.
Can I use this to measure higher voltages?
Yes, you can scale the input range by adding an external voltage divider using high-precision series resistors.
What is the input resistance of this meter?
The meter has an input resistance of 100MΩ.
How do I mount the meter to a panel?
The unit is designed to be mounted using the two integrated M3 threaded holes on the rear of the module.
Does this meter include a shunt for current measurement?
No, it does not include a shunt, but you can integrate one externally to measure current.
Is the PM-129 suitable for AC voltage measurements?
The base unit is designed for DC voltage measurements. Additional rectification circuitry would be required for AC applications.
Troubleshooting
Display shows irregular or jumpy values
Check your grounding connections and ensure the input signal is free from high-frequency noise or interference.
Meter displays zero despite voltage presence
Verify that your series resistor or shunt configuration is correctly wired and that the input terminals are not shorted.
Display is dim or flickering
Check the operating voltage supply connected to the meter and ensure it remains stable within the required range.
Pros and Cons
Pros
- Compact and easy to panel-mount
- High input resistance prevents circuit interference
- Versatile for various measurement applications
- Clear LED display for easy visibility
Cons
- Requires external components for range expansion
- Not intended for plug-and-play installation
- Lacks pre-calibrated housing for high-voltage isolation
Setup, Compatibility & Care
For installation, ensure your panel has a cutout matching the dimensions of the PM-129 to allow the display to sit flush. Use the provided M3 threaded holes to secure the unit firmly to the back of the panel. For the electrical setup, treat the input pins according to your intended measurement range. If monitoring voltages above 200mV, use the appropriate precision series resistors to create a divider. Avoid exposing the unit to moisture or extreme heat, as the internal components are designed for standard indoor electronic environment operation. Always verify your circuit connections against the device documentation before powering on to prevent damage to the meter’s sensitive input circuitry.