Author Topic: Fluke 8500A, 8502A(T), 8505A, 8506A modules  (Read 549 times)

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Offline m k

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Fluke 8500A, 8502A(T), 8505A, 8506A modules
« on: November 26, 2021, 09:07:07 am »
Included list has partnumbers combined from few manuals and some pictures.
It even includes the famously missing option -04.

If there is a mfg number it's from manual.
If mfg number is present but Fluke stock number is missing they are the same.
If there is no option ID then it's from picture.
Rest are eighter way.

Some variable module placements.

8506
Thermal true
RMS Multimeter
Instruction Manual
P/N 638858
MARCH 1983
page 8-8
Slot A
DC Signal Conditioner

8505A
DIGITAL MULTIMETER
Instruction Manual
P/N 638841
March 1983 Rev.2 2/91
page 8-8
Slot C
DC Signal Conditioner

here and xDevs have pictures where
D DC Signal Conditioner
C AC/DC Converter (RMS)
B Ohms Converter
A Current Shunts

Disclaimer
Included list is a totally new intervention.
And so can be taken as a clean second guess.
« Last Edit: December 01, 2021, 06:54:35 pm by m k »
 
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Offline m k

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Re: Fluke 8500A, 8502A(T), 8505A, 8506A modules
« Reply #1 on: November 26, 2021, 07:06:52 pm »
One Front/Rear more for 8506A and corrected A11 stock number typo.

Can't find a reason why I thought elsewhere that DC Signal Conditioner was universaly interchangeable.
Early and late part numbers are different.

E,
ods to xls
« Last Edit: November 26, 2021, 07:20:02 pm by m k »
 

Offline Martian Tech

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Re: Fluke 8500A, 8502A(T), 8505A, 8506A modules
« Reply #2 on: November 27, 2021, 04:27:35 am »
For reference, here's the inside of an 8500A.
 

Offline m k

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Re: Fluke 8500A, 8502A(T), 8505A, 8506A modules
« Reply #3 on: November 27, 2021, 12:44:04 pm »
IEEE-488 is not last, how the external connection happens?
 

Offline m k

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Re: Fluke 8500A, 8502A(T), 8505A, 8506A modules
« Reply #4 on: November 27, 2021, 12:47:58 pm »
One 8500A manual added.

Controller is one module but two parts.
Maybe CPU and ROMs were so expensive.

My guess for dual PCB controller is 8502A/AT and its extra needs.
Though the manual has only single module controller listed.

8502A/AT
(manual p/n 577049)
includes calibration memory(-04) as a standard feature.
Same with all A22 to A30 modules.
Operates with 400Hz mains.

Error A is illegal Thermal TRMS controller switches selected
Error E is more than one Thermal TRMS controllers installed

Boot
HI-3.0.0
C2454A 8

Cal Memory module has a battery and 2 RAM chips.
(429860 P5101L and 408757 P5101L-3)

8502A
(manual p/n 471466 rev 1 7/81)
Figure 8-7
A6 Controller PCB Assembly - Single PCB version

CPU and ROMs are blank, no component numbers, chip rectangles are present.
2 last of 6 RAM chips are completely missing, empty space in picture.

Figure 8-8
A6A1 Controller PCB Assembly - Double PCB version

1 ROM socket, no chips.
All ROMs are labeled as not used.
4th is also labeled as double PCB version interconnection.
2 last of 6 RAM chips are labeled as not used.

A6A2 Controller PCB Assembly - Double PCB version

5 of 6 ROM chips are without sockets.
6th is missing but socket is present, location like 3rd in A6A1.
Schematics has no address lines for that 6th ROM.

BTW, I have a strong feeling that I've seen a picture of Cal Memory module recently.
Can be a fake memory but if that lateral top edge battery is black and those two panduits are still strapped then it can be somebody's published but unknown feature.
 

Online Kleinstein

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Re: Fluke 8500A, 8502A(T), 8505A, 8506A modules
« Reply #5 on: November 27, 2021, 05:02:49 pm »
For the controller module there could be different versions: with more modern parts a single ROM or RAM chip could replace 2 or 4 chips. So the newer version may get the same function with less parts.
Using 2 PCBs for the controller would be just the space needed with multiple chips for the RAM and ROM.
 

Offline m k

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Re: Fluke 8500A, 8502A(T), 8505A, 8506A modules
« Reply #6 on: November 27, 2021, 08:34:10 pm »
8500A ROMs have Fluke numbers only, 4 pieces, CPU is named TMS8080.

8502A has 6x 2716 for double board and 3 ROMs and 1 PROM for single board.

Cal Memory then has 2 static RAMs with different part numbers.
Sure data inside is finally different but how it is maintained.
Maybe you were able to order them but delivery was onsite factory only.
Or maybe they knew or visioned that EEPROMs were coming.

E,
completely forgot those famous SRAM + battery chips.

« Last Edit: November 27, 2021, 08:46:30 pm by m k »
 

Offline m k

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Re: Fluke 8500A, 8502A(T), 8505A, 8506A modules
« Reply #7 on: November 28, 2021, 05:31:41 pm »
Closed case but anyway.

Third last.
http://pakahuszar.blogspot.com/2014/10/multimeterles-3-engineering-masterpiece.html

Martin.M had one maybe still has but can't find a local picture.
« Last Edit: Yesterday at 12:10:53 pm by m k »
 

Offline Martian Tech

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Re: Fluke 8500A, 8502A(T), 8505A, 8506A modules
« Reply #8 on: November 29, 2021, 03:29:03 am »
IEEE-488 is not last, how the external connection happens?
This is from the 8502A manual, but presumably the same for the 8500A
 

Offline m k

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Re: Fluke 8500A, 8502A(T), 8505A, 8506A modules
« Reply #9 on: November 29, 2021, 11:28:31 am »
Yes, it's not illegally placed but its usage is a bit difficult from there.
If it is not just stored there.

Another thing from the list, controller's preferred location seems to be bus termination something.
 

Offline m k

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Re: Fluke 8500A, 8502A(T), 8505A, 8506A modules
« Reply #10 on: December 01, 2021, 07:58:33 pm »
Bus Interconnect in slot K.

« Last Edit: Yesterday at 11:45:24 am by m k »
 


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