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| FLUKE 189 DC reading problem [with video] |
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| windsmurf:
Just some simple things to check on a used meter if it has measurement issues... Inspect all solder joints Clean Dial contacts - remove old dielectric grease from the dial contacts with IPA and swab, both sides (board and slider) Check the PTC, MOV, and input protection resistors Clean input jack with IPA/swab, check solder for solid electrical connection. The pin under the jack are sometimes broken. Check the resistor network for solid contact (both the board and on the resistor itself). I repaired one that had intermittent connection issues. |
| windsmurf:
Is your 87V calibrated? I measure current draw of about 3-5mV less on my 189 than what you get on yours. Also, 55MOhms at 1000v I think is normal... I get about 48MOhms on mine at 1000V. I would thoroughly clean your dial contacts on the board as well as the spring contacts under the rotary... and clean the spaces between the dial contact traces. Not just a rinse with IPA but rub well with a QTip. Don't lose those springs as they can pop off and fly away... I might even try swapping the spring contact placements to see if that changes things. Do you get strange reading with no input/nothing connected to the meter when switching modes? |
| kamcm:
--- Quote from: windsmurf on August 09, 2019, 07:35:57 pm ---Just some simple things to check on a used meter if it has measurement issues... Inspect all solder joints Clean Dial contacts - remove old dielectric grease from the dial contacts with IPA and swab, both sides (board and slider) Check the PTC, MOV, and input protection resistors Clean input jack with IPA/swab, check solder for solid electrical connection. The pin under the jack are sometimes broken. Check the resistor network for solid contact (both the board and on the resistor itself). I repaired one that had intermittent connection issues. --- End quote --- Thanks a lot. I have checked all of the components you mention. Everything looks good. I want to check the exact DC voltage go in FLUKE 669918, but I don't know which pin I should probe because no datasheet is available. It would be helpful if someone can tell me the exact pin of DC voltage go in FLUKE 669918. Thanks! |
| CDaniel:
So , just to be sure , there is any range for volt , milivolt , ohm , cap , current that is 100% ok ? I have a Fluke 187 with ( as far I can see ) identical board so I could check some voltages . |
| kamcm:
--- Quote from: CDaniel on August 10, 2019, 03:31:38 pm ---So , just to be sure , there is any range for volt , milivolt , ohm , cap , current that is 100% ok ? I have a Fluke 187 with ( as far I can see ) identical board so I could check some voltages . --- End quote --- At the time it behave normally, all the function works well and very accuracy. But most of the time. The reading just off the spec. https://www.eevblog.com/forum/testgear/fluke-189-dc-reading-problem-(with-video)/msg2548869/#msg2548869 The testing was done with fluke 702. I knew My 702 is accuracy and works well, I verify it with a few meters including 289 and 87V 87III etc. I think the incorrect reading of mA has somethings interesting. In some range the reading just higher than actual. Actual: 10mA Measure: 10.072mA (Get Higher than actual) Actual: 5mA Measure: 5.214mA (Get Higher than actual) Actual: 4mA Measure: 4.062mA (Get Higher than actual) Actual 3mA Measure: 2.763mA (Get Lower than actual) Actual 2mA Measure: 0.076mA (Get Lower than actual) Actual 1mA Measure: 0.038mA (Get Lower than actual) |
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