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Old March 18th 12, 01:08 PM posted to rec.radio.amateur.homebrew
JIMMIE JIMMIE is offline
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First recorded activity by RadioBanter: Jul 2006
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Default How to measure high tube amplifier voltage

On Saturday, March 10, 2012 5:56:31 AM UTC-5, Michael wrote:
Most multi-meters only measure voltages up to 1000 volts. How do you
measure voltages often used with tubes like 3-500z or 3cx1500a7
tubes? Will the range extended from Fluke listed below work with a
1000v 10 mega ohm multimeter?

80K-6 High Voltage Probe
http://www.fluke.com/fluke/usen/acce....htm?PID=55358

The multimeter I have is the Radio Shack 22-801 which is rated for up
to 1000 volts.

Radio Shack 22-801 owner's manual
http://www.radioshack.com/graphics/u...0801_PM_EN.pdf

Thanks

Michael


DO THIS WITH EXTREME CAUTION. Knowing the input resistance of the meter it is easy to use a series resistance to scale the input voltage. I have inserted 11M
in the front end of my 11M input impedance meter to make a 2X voltage divider. I connected the meter to the circuit, placed it in a Pyrex baking dish for insulation, stood at a distance and energize the power supply. I used several HV resistors removed from an old TV because I figured there was a danger of arc over using common resistors. I was truly surprise the meter didnt melt down annd the house main breaker didnt trip.

Jimmie