Service Manual – Fluke 12
Fluke 12 Digital multimeter
Manufacturer:
Fluke
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Model:
12
Date:
1991
Category:
Measurement instruments
Group:
Digital multimeter
Description:
Service Manual
Manual type:
Service Manual
Pages:
45
Size:
8.11 Mbytes (8500699 Bytes)
Language:
english
Revision:
1
Manual ID:
PN 900824
Date:
Quality:
Electronic document, no scan, very well readable.
Upload date:
2014 11 29
MD5:
28f0294d5dacb17691a9a5cc066d866e
Downloads:
2614
Information
1 Introduction and Specifications
. .. 1-1
1-1.
Introduction …
1-1
1-2.
Specifications …
1-1
2 Theory of Operation
…
2-1
2-1.
Introduction …
2-3
2-2. Theory of
Operation …
2-3
2-3. Analog Measurement IC (U1)
… 2-3
2-4. Microcomputer IC
(U2) …
2-3
2-5. VCHEK Input
Resistance …
2-3
3
Maintenance …
3-1
3-1.
Introduction …
3-3
3-2. Disassembly and Reassembly
…
3-3
3-3. Cleaning
…
3-7
3-4. Performance
Tests …
3-7
3-5. Calibration
…
3-8
4 Replaceable Parts and
Schematics … 4-1
4-1.
Introduction …
4-3
4-2. How To Obtain Parts
…
4-3
4-3. Schematics
…
4-3
4-4. Warranty and Service Centers
…
4-4
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Service Manual
Manual type:
Service Manual
Pages:
51
Size:
8.
11 Mbytes (8502869 Bytes)
Language:
english
Revision:
1
Manual ID:
PN 900824
Date:
Quality:
Electronic document, no scan, very well readable.
Upload date:
2014 11 29
MD5:
5e546a84cfd964af37eab7fb51405c34
Downloads:
2005
Information
1 Introduction and Specifications
… 1-1
1-1.
Introduction …
1-1
1-2.
Specifications …
1-1
2 Theory of Operation
…
2-1
2-1.
Introduction …
2-3
2-2. Theory of
Operation …
2-3
2-3. Analog Measurement IC (U1)
… 2-3
2-4. Microcomputer IC
(U2) …
2-3
2-5. VCHEK Input
Resistance …
2-3
3
Maintenance …
3-1
3-1.
Introduction …
3-3
3-2. Disassembly and Reassembly
…
3-3
3-3. Cleaning
…
3-7
3-4. Performance
Tests …
3-7
3-5.
Calibration
…
3-8
4 Replaceable Parts and
Schematics … 4-1
4-1.
Introduction …
4-3
4-2. How To Obtain Parts
…
4-3
4-3. Schematics
…
4-3
4-4. Warranty and Service Centers
…
4-4
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User Manual
Manual type:
User Manual
Pages:
31
Size:
773.52 Kbytes (792082 Bytes)
Language:
english
Revision:
Manual ID:
2063508
Date:
Quality:
Electronic document, no scan, very well readable.
Upload date:
2016 01 26
MD5:
865d582f73026888ef52488de5d7c4a2
Downloads:
751
Information
READ FIRST: SAFETY INFORMATION
… 1
SYMBOLS
…
2
DISPLAY
…
3
OPERATING FEATURES
…
4
STANDBY
MODE .
..
5
INPUT
RANGES …
5
Autoranging
…
6
Manually Selecting a Range
…
6
MEASURING
VOLTAGE …
7
TESTING CONTINUITY AND MEASURING RESISTANCE
… 9
TESTING DIODES
…
11
VCHEK AND HOW TO USE IT
…
13
DISABLING i WITH FUNCTION
LOCK … 14
MEASURING CAPACITANCE
…
15
USING MIN MAX
FUNCTIONS …
17
Recording Minimum and Maximum Readings
… 17
Recording Minimum and Maximum Reading with Elapsed Time
… 19
Capturing Continuity Intermittents with Continuity
Captureä … 21
TURNING BEEPER
OFF …
23
MAINTENANCE …
23
N Replacing the
Battery …
23
Replacing the Test Leads
…
23
Service and
Parts …
24
Accessories …
24
SPECIFICATIONS …
24
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Don’t toss it. Fix it!
By Dan KB6NU 9 Comments
Last night, in the afterglow of successful sales at the USECA Hamfest on Sunday morning, I was going through the junk I’ve collected over the years, looking for stuff to sell at the next hamfest.
One thing that I came across was a Fluke Model 12 multimeter. Fluke gave me this meter to review way back when I was an editor for Test&Measurement World magazine.
The Fluke 12 is an interesting meter because the controls are so different. Instead of using a big rotary switch found on most DMMs, to choose the measurement type you have to set the slide switch to one of two settings, then hit the button in the upper left-hand corner. In practice, users must have found this a bit confusing as the Fluke 12B, the next model in this line, went back to the big rotary switch.
At any rate, I pulled the meter out of the box, inserted a 9 V battery, and switched it on. I was very disappointed to find that many of the LCD segments were either not working or appeared to be only half on. Not only that, none of the function switches seemed to be working. I tried a different 9 V battery just in case, but got the same results as with the first battery.
At that point, the thought crossed my mind to just chuck it.
The meter is at least 25 years old, and even though I rarely used it, it was given to me, so I wasn’t really out any money. After thinking about it a little, though, I thought I’d take it apart to see if there were any obvious problems that I could easily fix.
To get the meter apart, you have to first unscrew four screws from the rear, then lift off the rear part of the case. What you see at this point is the rear of the main board, which snaps into the front part of the case. To find the problem, I was going to somehow extract the main board.
This was easy enough to do. All I needed was a small screwdriver, which allowed me to pry the board from the case. There were even a couple of notches in the PCB to allow one to do this more easily.
The first thing that I noticed was a set of pads up near the top of the main board. As it turns out, these pads are for the signals that drive the LCD segments. The signals are connected to the LCD via a “flexible, zebra connector strip, as shown at right.
The connector strip is made of a spongy silicone material and when the main board is pressed into the front part of the case, this zebra strip connects the main board to the LCD.
Since my first rule of troubleshooting is to check the connections, the first thing that I did was to run my finger along both the pads on the main board and then on the zebra strip. After I did this, I snapped the main board in, and powered up the meter. Like magic, the LCD now had no bad segments.
The function switches still weren’t working, though. I popped the board out again to take a look. Sure enough, there was a smaller zebra strip that connected the main board to the switch board. I ran my finger over the pads on the main board and the zebra strip connector, snapped the board back into the case, and powered up the meter again. I was very happy to see that now the function switches worked as well, and I had a functional DMM.
The point of all this is to encourage you to do a little tinkering with some non-functional electronics that you might have or might be able to get for cheap at some hamfest.