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Author Topic: Transformer  (Read 1176 times)

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Offline AirScooterTopic starter

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Transformer
« on: March 31, 2021, 06:10:27 pm »
This is the schematic of the power supply on my Fluke 8000A Bench Multimeter.
The transformer gave up the ghost after 50 years of service. I'm trying to find a replacement for it.
It's a through hole mount 5 studs through the board to a side. The output side has one stud cut off. It outputs +5v and +15v DC, 115AC mains.
The Fluke part is #345629. (No longer supported by Fluke) The Manufacture Supply Code is 89536. I am looking for a physical size in the manual but so far coming up short. If you need more/different information let me know.
Thanks,
Dave Lowa

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Offline bdunham7

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Re: Transformer
« Reply #1 on: March 31, 2021, 06:24:04 pm »
Can you post a photo of the board and the revision number?
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A 3.5 digit 4.5 digit 5 digit 5.5 digit 6.5 digit 7.5 digit DMM is good enough for most people.
 

Offline DLJ

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Re: Transformer
« Reply #2 on: March 31, 2021, 06:53:11 pm »
Which transformer do you suspect? The schematic you have attached has two.
T1 is used to generate 5V, and T2 is used to generate +15V and -15V from that 5V.
Does the meter still work on battery power?

It would appear that there are at least 3 different variants Of the Fluke 8000A - the service manual show the schematics for these. Each has a different PSU. Which one do you have?
« Last Edit: March 31, 2021, 07:22:02 pm by DLJ »
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Offline AirScooterTopic starter

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Re: Transformer
« Reply #3 on: March 31, 2021, 09:14:51 pm »
Super Question, but we'll have to wait till tomorrow to find out. Have to wait for the supplier and his questions to get back in the office.
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Offline AirScooterTopic starter

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Re: Transformer
« Reply #4 on: March 31, 2021, 09:32:05 pm »
Here you go bd..........
Thanks for your help!
1206656-0
1206660-1
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Offline bdunham7

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Re: Transformer
« Reply #5 on: March 31, 2021, 10:17:25 pm »
You have the wrong schematic.  How do you test the transformer? 

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A 3.5 digit 4.5 digit 5 digit 5.5 digit 6.5 digit 7.5 digit DMM is good enough for most people.
 

Offline bob91343

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Re: Transformer
« Reply #6 on: March 31, 2021, 10:46:01 pm »
The OP's diagram shows a battery operated unit; the battery runs a square wave oscillator that generates the voltages for operation.  The diagram above shows no battery, just a simple TR with simple regulators.
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