Author Topic: Anyone interested in making a FLUKE 8920A adapter?  (Read 1295 times)

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Offline daisizhouTopic starter

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Anyone interested in making a FLUKE 8920A adapter?
« on: May 18, 2022, 01:24:27 am »
Saw on Youtube a French author made a FLUKE 8920A multimeter online adapter.
Due to the language, I don't know much about the author's description, and I still don't know much about some details after using the translation software.
Only "see pictures and talk",I made the author's PCB and some chips are in transit.

I don't know if there are any friends with the same hobbies.hope to share


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Offline coromonadalix

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Re: Anyone interested in making a FLUKE 8920A adapter?
« Reply #1 on: May 18, 2022, 02:06:13 am »
im native french,  he read the analog port on the back panel and thru the internal connector j501  he read the ranges

i think it will be a multi part video ??  he talks about designing an mcu board with an external 12bit or more adc to do the job, an 10 adc is not sufficient  ........

and in the zip you have the schematics and the executable software


seems well designed  for an hobby project    :-+ :-+
« Last Edit: May 18, 2022, 02:09:25 am by coromonadalix »
 

Offline daisizhouTopic starter

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Re: Anyone interested in making a FLUKE 8920A adapter?
« Reply #2 on: May 18, 2022, 02:33:04 am »
Yes, this is a series of at least 5 or more.
Unfortunately, I can't understand the detailed introduction, and the author's subtitles are also in French.After I use translation software to translate, the meaning seems to be deviated.
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Offline coromonadalix

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Re: Anyone interested in making a FLUKE 8920A adapter?
« Reply #3 on: May 18, 2022, 10:56:26 am »
The added circuit in the schematics is to read the Fluke thru an added mcu+adc  circuit, not to control it ......

It read the ranges modes and as i wrote  the back panel rear voltage,  the circuit has some software compensation/calibration

you have the arduino code

you read theses ranges, and you have an manual or automatic mode

1 : 2 mV
2: 20 mV
3: 200 mV
4 : 2 V
5 : 20 V
6 : 200 V
7 : 700 V
 

Offline daisizhouTopic starter

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Re: Anyone interested in making a FLUKE 8920A adapter?
« Reply #4 on: May 18, 2022, 11:26:05 am »
Do you only need to connect J1 (7-pin) to the J501 interface in the 8920A?
I don't know how the J23 interface is connected to the 8920A.
J23 is a reserved interface, no need to connect?
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Offline coromonadalix

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Re: Anyone interested in making a FLUKE 8920A adapter?
« Reply #5 on: May 19, 2022, 01:53:29 am »
you need both 

 j23 will give the voltage / read  to the input of the pcb interface / project ADC  as you see in the schematic (zipped file)
« Last Edit: May 19, 2022, 01:56:48 am by coromonadalix »
 

Offline daisizhouTopic starter

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Re: Anyone interested in making a FLUKE 8920A adapter?
« Reply #6 on: May 19, 2022, 02:30:16 am »
Is it connected like this? But J23 I don't know how to connect
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Online Kleinstein

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Re: Anyone interested in making a FLUKE 8920A adapter?
« Reply #7 on: May 19, 2022, 04:41:51 am »
I only had a short look (and don't understand french). There seems to be no electric isolation between the DMM input and the output output side, at least up to the arduino.  One should have an isolated USB, likely as isolared UART and than a UART/USB adater. 
 

Offline coromonadalix

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Re: Anyone interested in making a FLUKE 8920A adapter?
« Reply #8 on: May 19, 2022, 08:34:52 am »
Is it connected like this? But J23 I don't know how to connect

you have to put a wire between the rear plugs and the project pcb ???  two if you add the ground,

as i've written  YOU need to read the banana plugs on the back panel  since its an analog value  of what is measured on the fluke display
 

Offline daisizhouTopic starter

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Re: Anyone interested in making a FLUKE 8920A adapter?
« Reply #9 on: May 19, 2022, 09:57:38 am »
Do you mean I connect it like the picture below?
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Offline coromonadalix

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Re: Anyone interested in making a FLUKE 8920A adapter?
« Reply #10 on: May 20, 2022, 01:06:22 am »
seems like it ...
 

Offline daisizhouTopic starter

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Re: Anyone interested in making a FLUKE 8920A adapter?
« Reply #11 on: May 20, 2022, 01:26:03 am »
ok, i followed this scheme to assemble the chip, the chip is in transit.

grateful :-+
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Offline pigrew

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Re: Anyone interested in making a FLUKE 8920A adapter?
« Reply #12 on: May 20, 2022, 02:17:09 am »
The 8920A manual mentions an IEEE-488 interface available as a factory option, but I can't find any details anywhere.

It'd completely change the project, but it looks like you could read the digital data from the DMM using the J601 connector, along with range info from J501. J601 output is BCD, with strobe lines. I don't see any connections that would allow control of the DMM. I'd guess the IEEE-488 interface is talk only?

And as others have mentioned, galvanic isolation is a good idea. The option for a frequency counter incorporated a pair of transformers for isolation.

(I don't have an 8920A, so don't have any reason to complete this project. However, I've done similar interfaces in the past for other manufacturer's equipment...)
« Last Edit: May 20, 2022, 03:18:26 am by pigrew »
 


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