Need LCR Meter Help

Dean B. 21 years ago

Hello All, I just bought an Amrel (American Reliance) LCR Meter Model 470D off E-bay and it has problems. The higher up ranger get successively more inaccurate than the lower ranges. I poped it open hoping it might be a simple calibration thing and it has a LOT of trim pots (non labeled though). I don't suppose anyone has a service manual, schematic, or calibration procedure for this thing. As it stands it's pretty much useless.

Any and ALL help will be greatly appreiated.

Thanks....all the best...Dean.

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NSM 21 years ago

off

ranges.

First, are you sure it's the meter? Second, is the battery OK? No point worrying about easy stuff!

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Dean B. 21 years ago

Hello "N", with 36 years experience in electronics I can safely say YES it's the meter and NO it's not the battery.

I've used 1% resistors and 2% capacitors as "Test" subjects (Both confirmed with another meter). I bought this meter SPECIFICALLY for use in reading Inductance (in hopes in winding my own coils for use in Audio EQ circuits).

What I have discovered is that scoping the test terminals I get a clean 1Khz sine wave on some settings,a distorted (heavily clipped) 1Khz sine wave on others, and a noisy 125Hz sine wave on the remaining settings. Seems to me among other things that the reference oscillator is faulty or in some need of calibration. I would guess the 125Hz should in fact be a clean 100Hz as it's used in the higher ranges (2H, 20H,

20uF, 200uF,2nF)

As to the battery...I'm using an A-C adapter from a different device and I've confirmed the Power supply from within the LCR meter (in case an internal regulator was at fault).

Thanks anyway...any other thoughts...anyone...

Cheers....Dean.

thing.

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NSM 21 years ago

it's

OK. What does Amrel say about it? Service manuals available?

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me 21 years ago

should be able to fix it myself?

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