Fluke 87 repair - Page 2

imix500 · 15th April 2006, 05:48 AM

That's what I figured. 1000v max means- 1000v max.

dfdye · 15th April 2006, 07:06 AM

Quote:

Originally posted by imix500
That's what I figured. 1000v max means- 1000v max.

lol, indeed!!!! Next time get yourself a good 10X scope probe and save the repair! I have a buddy that had to make a 10,000X (I think) probe for measuring the potential at a mass spectrometer ionization source. The fact that it had to be encased in oil was more than amusing to me!

But at least he didn't fry his detector!!

Anyway, good luck with getting the Fluke fixed.

Blues · 15th April 2006, 02:09 PM

Quote:

Originally posted by imix500
That's what I figured. 1000v max means- 1000v max.

If you need to measure 1kV don't use a handheld multimeter

imix500 · 15th April 2006, 04:24 PM

Yeah a high votage probe is not a bad purchase idea. They are cheap on ebay.
Blues, hehe I agree, although I wouldn't doubt flukes voltage rating there.
To my defense I was measuring around 1200v, just over the limits of the meter- not off of a flyback or anything, it was not in my hand when I was metering, and it was by accident. Thanks!

powertriode · 15th April 2006, 04:38 PM

Out of interest, what did you smoke it measuring?

imix500 · 16th April 2006, 04:48 AM

I've been repairing and bulding my own laser power supplies for a few years now. I was working on a supply consisting of a bank of 16 450v 3400uf capacitors among others.
I was reforming some large oil energy storage caps for the firing circuit and I forgot the meter was still connected as I was bringing the voltage up (I use a surplus electrophoresis supply for reforming)

dfdye · 17th April 2006, 01:53 AM

Quote:

Originally posted by imix500
I've been repairing and bulding my own laser power supplies for a few years now.

I have 3 Nd-YAG's, 2 high powered diodes, an OPPO, H2 Shifter, Ar+ and Kr+ in my lab. I am extremely sympathetic to dealing with those types of supplies and the related high voltages.

willyhoho · 18th April 2006, 11:51 PM

You better checked those M0V,s (they are red) I test them out of circuit. GOOD LUCK

imix500 · 19th April 2006, 04:13 AM

dfdye, hehe. Excellent collection. I myself only have a working SSY-1 system in my apt. I have a huge dye laser head I'm hoping to eventually convert to nd/yag. Now I just have to find a ~1/4" x 12" rod, two lamps to match and 1" optics. Eh, it was $30. Aside form that a bunch of yag power supplies and parts, and 4 or 5 large thyratrons. My father is into visible light gas ion (argon, mixed gas) large frames. He's got a Lexel 95, Coherent I-90, and a SP 2012. Fun stuff.

willyhoho, will do. Forgot these meters use mov's. I wish schematics were find-able for these meters.

imix500 · 9th May 2006, 02:52 AM

Just an update, got the service manual from Fluke. I was really suprised they have them for download.
After a thorough evaluation of the front end of the meter, I'm replacing the fusible resistor R1, both varistors RV1 and RV2, the thermistor RT1, and a cap C1 that was damaged by the varistors when they blew. Basically the entire front end protection except for the spark gap. It appears to still be a spark gap.
I bought the parts directly from fluke through thier estore. Also picked up an extra set of fuses. I thought $40 for those original replacement parts wasn't bad considering what it might cost to send it in for repair.

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15th April 2006, 05:48 AM	#11
imix500 Proud Union Member diyAudio Member Join Date: Mar 2004 Location: Putnam, NY	That's what I figured. 1000v max means- 1000v max.

15th April 2006, 04:24 PM	#14
imix500 Proud Union Member diyAudio Member Join Date: Mar 2004 Location: Putnam, NY	Yeah a high votage probe is not a bad purchase idea. They are cheap on ebay. Blues, hehe I agree, although I wouldn't doubt flukes voltage rating there. To my defense I was measuring around 1200v, just over the limits of the meter- not off of a flyback or anything, it was not in my hand when I was metering, and it was by accident. Thanks!

15th April 2006, 04:38 PM	#15
powertriode diyAudio Member Join Date: Jun 2004 Location: South East	Out of interest, what did you smoke it measuring?

16th April 2006, 04:48 AM	#16
imix500 Proud Union Member diyAudio Member Join Date: Mar 2004 Location: Putnam, NY	I've been repairing and bulding my own laser power supplies for a few years now. I was working on a supply consisting of a bank of 16 450v 3400uf capacitors among others. I was reforming some large oil energy storage caps for the firing circuit and I forgot the meter was still connected as I was bringing the voltage up (I use a surplus electrophoresis supply for reforming)

18th April 2006, 11:51 PM	#18
willyhoho diyAudio Member Join Date: Nov 2005	You better checked those M0V,s (they are red) I test them out of circuit. GOOD LUCK

19th April 2006, 04:13 AM	#19
imix500 Proud Union Member diyAudio Member Join Date: Mar 2004 Location: Putnam, NY	dfdye, hehe. Excellent collection. I myself only have a working SSY-1 system in my apt. I have a huge dye laser head I'm hoping to eventually convert to nd/yag. Now I just have to find a ~1/4" x 12" rod, two lamps to match and 1" optics. Eh, it was $30. Aside form that a bunch of yag power supplies and parts, and 4 or 5 large thyratrons. My father is into visible light gas ion (argon, mixed gas) large frames. He's got a Lexel 95, Coherent I-90, and a SP 2012. Fun stuff. willyhoho, will do. Forgot these meters use mov's. I wish schematics were find-able for these meters.

9th May 2006, 02:52 AM	#20
imix500 Proud Union Member diyAudio Member Join Date: Mar 2004 Location: Putnam, NY	Just an update, got the service manual from Fluke. I was really suprised they have them for download. After a thorough evaluation of the front end of the meter, I'm replacing the fusible resistor R1, both varistors RV1 and RV2, the thermistor RT1, and a cap C1 that was damaged by the varistors when they blew. Basically the entire front end protection except for the spark gap. It appears to still be a spark gap. I bought the parts directly from fluke through thier estore. Also picked up an extra set of fuses. I thought $40 for those original replacement parts wasn't bad considering what it might cost to send it in for repair.

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