| Products > Test Equipment |
| Fluke Meter - Over Voltage - Broken? |
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| bpan:
Here is the scenario. I was testing an outboard motor stator. The stator is puts out a voltage in AC to the ignition Coils. Because the RPM is so fast and most meters can't keep up, we use a DVA adapter. I think it's long name is Direct Voltage Adapter. It basically holds the peak voltage recorded in DC volts. Anyhow the motor was having issues, and the voltage was going up into the 600v range, when I assume it spiked. The meter went blank, and the voltage scale reset itself to 6v instead of 1000v. This happened a couple times. Then I stopped. The meter seems fine, but I'm still worried. Any ideas? The meter is an 88v |
| floobydust:
Did you hear the screams of pain from the multimeter? |
| bpan:
I did not hear any actually, although they would have been tough to hear over my internal screams of pain. |
| bdunham7:
If you are working with primary ignition systems, you can get fast, high-voltage moderate energy pulses that don't burn the front end but propagate internally and reset the MCU. You could also possibly have damage to small semiconductors like diode clamps or the EEPROM that the calibration data is stored in. If the meter works OK and appears to be accurate, then it likely is just fine. However, I wouldn't use it that way anymore. |
| floobydust:
It sounds like the high voltage, fast edge waveform just made the multimeter crash and reboot. Not sure what a DVA adapter has inside. Your test setup has a lot of EMI and common-mode noise that will cause most multimeters to crater. They need that inside foil shield. The 88 has good overvoltage protection, and when that fails it will read incorrectly. Try out all its functions to make sure. |
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