Author Topic: Fluke 73  (Read 1655 times)

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Offline retrace

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Fluke 73
« on: July 12, 2017, 08:49:48 pm »
Hello guys
I have a Fluke 73 multimeter. Its the first fluke 73, with no buzzer. Is there any way to add buzzer inside? It would be very nice to have this function. i saw that Fluke73 II has the buzzer function on diode test.
Thanks !
 

Offline retiredcaps

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Re: Fluke 73
« Reply #1 on: July 12, 2017, 09:53:03 pm »
Is there any way to add buzzer inside?
Yes, it might be possible.  A quick look at the original Fluke 70 series I and II user/service manual shows they use the same U1 processor so the functionality might be built in, but not enabled.

I suggest you download both service manuals and do a comparison.  The older service manuals are excellent since they have a theory of operation, bill of materials and schematics.  From the 3 sections, you should be able to see what is required to possibly add a beeper function.

You might have to add some extra components and/or circuitry onto the pcb somehow?
 

Offline retiredcaps

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Re: Fluke 73
« Reply #2 on: July 12, 2017, 09:54:25 pm »
The original Fluke 70 series I service manual can be found by searching for

fluke 70 series pn731034
 

Offline oldway

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Re: Fluke 73
« Reply #3 on: July 13, 2017, 11:30:35 am »
I have the same, I bought it used in 1993 and I still use it

What was sometimes annoying is the lack of manual range.

I bought a broken 75 for 5 bucks and I used its rotary knob in my 73.

You have to make a small and easy modification that I can not remember.

My 73 has now the manual range function...So far I know, the touch hold mode does not works in my 73.
« Last Edit: July 13, 2017, 11:32:28 am by oldway »
 

Offline retiredcaps

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Re: Fluke 73
« Reply #4 on: July 13, 2017, 03:39:10 pm »
You have to make a small and easy modification that I can not remember.
Possibly something like this?

https://groups.google.com/forum/#!topic/sci.electronics/rgEo-5NkMOo
 

Offline retrace

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Re: Fluke 73
« Reply #5 on: July 13, 2017, 03:46:29 pm »
Thanks guys
After some clips on youtube on fluke 75 i saw that the piezo speaker has 2 points where comes
In contact eith the pcb. I took the piezo speaker from a cheap multimeter and soldered it to the 2 points on the pcb. Now i have the buzzer function on diode test. It even makes a small beep when I cycle between the functions
 

Offline BMack

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Re: Fluke 73
« Reply #6 on: July 15, 2017, 07:20:25 am »
Thanks guys
After some clips on youtube on fluke 75 i saw that the piezo speaker has 2 points where comes
In contact eith the pcb. I took the piezo speaker from a cheap multimeter and soldered it to the 2 points on the pcb. Now i have the buzzer function on diode test. It even makes a small beep when I cycle between the functions

That's a killer fix! Congratulations!
 

Offline retiredcaps

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Re: Fluke 73
« Reply #7 on: July 15, 2017, 06:09:08 pm »
In contact eith the pcb. I took the piezo speaker from a cheap multimeter and soldered it to the 2 points on the pcb.
Would you share some pictures of your modification?
 

Offline retrace

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Re: Fluke 73
« Reply #8 on: July 16, 2017, 08:09:04 am »
The two points where i soldered the buzzer
 


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