Products > Test Equipment

Fluke 189 with leaking surface mount supercap (also Fluke 287, Fluke 289)

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Jay_Diddy_B:

--- Quote from: casinada on May 13, 2014, 05:30:12 am ---Good job Jay.
Why didn't you send them to Fluke? At least they do a Calibration verification after the repair. :)

--- End quote ---

Several reasons:

1) I am not the original owner. The new one which has not failed (yet?) is mine from new. One of the used units is mine the other belongs to a friend.

2) I want to see if the meters had the problem reported here.

3) The super capacitor does not impact calibration.

4) It was quicker to fix than return to Fluke.

5) If Fluke replaced C145 with the same part, the problem will return.

6) I can do a performance check, I can't call it a calibration because my equipment has not been calibrated recently. I have the following:

Fluke 5101B - Multifunction calibrator
Fluke 732A - DC Voltage standard
Datron 1281 - 8.5 digit meter

Fluke would like to find them out of calibration, so they can charge you for a calibration.

7) I have no reason to believe that the meters were out of calibration.

To xwarp

I will post a picture the next time I have it apart. It is quite easy, you trim the leads and solder the thru-hole part to the SMD pads.

To BravoV,

I did not measure the capacitance of the bad caps, they was so much leakage current it would be hard to do. If I had to, I would measure the discharge time with a resistive load. But these caps were dead, expired, permanently damaged, useless, beyond hope...  ;D

I think that this is correct:

 :-DMM  :-DMM for two fixed 289s  :-+

Regards,

Jay_Diddy_B

casinada:
Thank you for Replying Jay,
I purchased mine used and they never asked me anything but the serial number of the unit. As soon as I told them the problem they issued an RMA.
I'm sure they know what is going on with the supercap so they're probably using a better part (don't know because it has the stickers now so I don't want to open it). Every time they open an instrument for repair they do a calibration if necessary. On my 289 they plugged it to a 5520A and it was still within specifications. I wonder how they test temperature and capacitance.
I'm trying to repair a Fluke 5102B...progress is very slow. It would help to have the extender boards. There are lots of revisions of this calibrator :(
I try to repair everything myself but in this case sending the unit to Fluke was part of the experience :)

quarks:

--- Quote from: casinada on May 14, 2014, 04:37:56 am ---I wonder how they test temperature and capacitance.
--- End quote ---

If you look in the calibration manual (page 16-17) you find

if you do not have a calibrator you can just look at a Type K data table and try to simulate the Input Voltages:
0°C = 0V
100°C = 4,09623mV
1000°C = 41,27561mV

and for capacitance verification they only check one value (5nF see page 19)

casinada:
:)

Excavatoree:

--- Quote from: casinada on May 14, 2014, 04:37:56 am ---Thank you for Replying Jay,
I purchased mine used and they never asked me anything but the serial number of the unit. As soon as I told them the problem they issued an RMA.

--- End quote ---

I doubt they'd repair my 189-II, however.  It's pretty obvious I'm not the original owner.  I suppose I could get a 287 LCD mask for it, but I suspect the serial number is flagged as well.   

However, I could be wrong.  Has anyone tried it?

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