liquias
Newbie level 5
Hi,
I need some help repairing a Fluke 87 (I) multimeter.
I bought a second hand Fluke 87 on E-Bay a few days ago.
15A Fuse was blown.
Fluke works fine in general, But when I turn on AC measurements (all - Volts, Amps/milliAmps , uAmps) I get a "ghost" reading of three right digits that start to go down and the rate of value drop is declining:
For example:
If I just switched the meter from DC Amps to AC Amps - The display shows about 180 which drops down after one second to about 70 and after one more second it drops down to 15, after about 10 more seconds drops to 4, after about half a minute I get a reading of 3, a minute later I get 2 and so on... A reading of 1 seems to be permanent (stuck) and it won't go away.
Does someone have any experience in how to go about fixing these meters ?
What could have gone wrong ? (My guess is that it's whatever blown the fuse...)
How do I fix it ? What do I look for ?
p.s.
1) No warranty on this device ...
2) I got the 83 85 87 service manuals and schematics...
I need some help repairing a Fluke 87 (I) multimeter.
I bought a second hand Fluke 87 on E-Bay a few days ago.
15A Fuse was blown.
Fluke works fine in general, But when I turn on AC measurements (all - Volts, Amps/milliAmps , uAmps) I get a "ghost" reading of three right digits that start to go down and the rate of value drop is declining:
For example:
If I just switched the meter from DC Amps to AC Amps - The display shows about 180 which drops down after one second to about 70 and after one more second it drops down to 15, after about 10 more seconds drops to 4, after about half a minute I get a reading of 3, a minute later I get 2 and so on... A reading of 1 seems to be permanent (stuck) and it won't go away.
Does someone have any experience in how to go about fixing these meters ?
What could have gone wrong ? (My guess is that it's whatever blown the fuse...)
How do I fix it ? What do I look for ?
p.s.
1) No warranty on this device ...
2) I got the 83 85 87 service manuals and schematics...