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I purchased 3 used units as for measuring high voltage on spark plugs. None work. The variable pot sets the range for led to come on at level. There is a visible "NEON" bulb on all units. The input high volts has to go through it. The 2 leds are ok and the pot. Should I assume the neons are all bad? This is a capacitance clip pick up of high volts from the plug cable,- not direct connection. This type of meter is what was used in auto garages before switching to large oscilloscope or the hand held small scopes with probe voltage divider protection.
On another note, I had fixed several people's timing lights as they had put power clips on wrong bat terminals and charged up the main capacitor backwards. No flashing with wrong polarity. Some consumer products have diodes on input for the stupid people.
These three board units are Snapon MT2700 high voltage test meters for measuring spark plug high volts using neon bubs with variable resistor. The pots were tested OK. There is small power circuit and led using input 9v battery. None of the 3 same boards registers high voltage.
Last edited: Aug 30, 2024
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MisterBill2
On another note, I had fixed several people's timing lights as they had put power clips on wrong bat terminals and charged up the main capacitor backwards. No flashing with wrong polarity. Some consumer products have diodes on input for the stupid people.
These three board units are Snapon MT2700 high voltage test meters for measuring spark plug high volts using neon bubs with variable resistor. The pots were tested OK. There is small power circuit and led using input 9v battery. None of the 3 same boards registers high voltage.
Last edited: Aug 30, 2024
Quote Reply
Report Edit
MisterBill2
