Ridgid CM-100 Micro Clamp Meter - Ridgid
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Product Information
Full details
The Ridgid CM-100 Micro Clamp Meter is a versatile true RMS digital clamp meter designed for electricians and technicians needing accurate AC/DC current measurements up to 1,000A. Its large capacity clamp can accommodate cables up to 30mm O.D., and it doubles as a multimeter with 8 additional functions. While offering a wide measurement range and a clear backlit LCD, users should be aware of its CAT III 600V overload protection rating.
All features
| Model Part Number | 37428 |
|---|---|
| Brand | Ridgid |
Extended Product Information
FAQs
What is True RMS and why is it important?
True RMS (Root Mean Square) measurements provide accurate readings for signals that are not perfect sine waves, such as those found in variable frequency drives or noisy power lines. This ensures you get a more realistic measurement of the actual power being delivered or consumed.
How do I measure AC current with the clamp meter?
Set the dial to the appropriate AC current setting (e.g., 'A~'). Open the clamp jaws and place them around the conductor you wish to measure. Ensure the jaws are fully closed. The reading will appear on the LCD. For best accuracy, center the conductor within the jaws.
Can I measure DC current with this clamp meter?
Yes, the Ridgid CM-100 can measure DC current up to 1,000A. Select the DC current setting (e.g., 'A-') on the dial and follow the same procedure as for AC current measurement.
What is the maximum cable size the clamp can accommodate?
The clamp jaws can accommodate cables with an outside diameter of up to 30mm.
What accessories are included with the CM-100?
The meter comes supplied with a soft carrying case, test leads, a Type K temperature probe, and a 9V battery.
What is the overload protection rating?
The CM-100 has an overload protection rating of CAT III 600V.
How does the Auto Power-Off function work?
The meter will automatically turn off after approximately 20 minutes of inactivity to conserve battery power. You can re-activate it by pressing the power button or turning the dial.
Troubleshooting
Meter does not power on
Ensure the 9V battery is correctly installed and has sufficient charge. Check if the battery compartment cover is securely closed.
Inaccurate readings
Verify that the correct function and range are selected. Ensure test leads are properly connected for multimeter functions. For current measurements, ensure the clamp is fully closed around the conductor and the conductor is centered within the jaws.
Display shows 'OL' or '-OL'
This indicates an overload condition. The measured value exceeds the selected range. Select a higher range for current or voltage, or ensure the conductor is within the meter's measurement limits.
Continuity test not beeping
Check that the meter is set to the continuity function. Ensure there is a valid low-resistance path. Test the leads by touching them together; they should beep. If not, check the battery or test leads.
Pros and Cons
Pros
- Versatile with 9 measurement functions including 1,000A AC/DC current.
- True RMS for accurate readings on complex waveforms.
- Large, backlit LCD for easy viewing.
- Comfortable one-handed operation due to slim design.
- AutoRanging simplifies measurement selection.
Cons
- Overload protection limited to CAT III 600V.
- Capacitance measurement range might be limited for specialized tasks.
- Frequency measurement is limited to 4kHz.
Setup, Compatibility & Care
Setup:
- Install Battery: Open the battery compartment on the back of the meter and insert the included 9V battery, ensuring correct polarity.
- Connect Test Leads: For multimeter functions (voltage, resistance, etc.), plug the red test lead into the 'VΩmA' or 'VΩHz' jack and the black test lead into the 'COM' jack. Ensure the selector dial is set to the desired function.
- Power On: Press the power button or turn the selector dial to turn the device on. It will typically start in Auto mode.
Compatibility:
- The clamp meter is designed for measuring electrical parameters in standard AC/DC circuits. It is compatible with cables up to 30mm in diameter.
- Overload protection is rated for CAT III environments up to 600V. Avoid using it in environments exceeding these ratings.
Care:
- Cleaning: Wipe the exterior with a soft, dry or slightly damp cloth. Avoid using abrasive cleaners or solvents.
- Storage: Store the clamp meter in the provided soft carrying case to protect it from dust and damage when not in use.
- Battery Replacement: Replace the 9V battery when the low battery indicator appears on the display. Ensure the meter is powered off before replacing the battery.
- Probe Care: Keep the test leads and temperature probe clean and free from damage. Replace them if insulation is compromised.