Electronics > Repair
Please help, FLUKE 8920A Multimeter Repair
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daisizhou:

--- Quote from: Harry_22 on June 21, 2024, 08:36:59 am ---Try to set up zero voltage for both cases.
Don't be afraid it won't get any worse.

--- End quote ---

Do you mean steps 1 to 8 in paragraph 4-48 on page 4-19 of the Service Manual?
Adjust R72, TP3 voltage is (0mv), adjust R26, TP3 voltage is (0mv)?
Finally adjust them to 0mv? Or 1mv?
Harry_22:
Yes
daisizhou:
As you requested, I followed steps 1 to 8 in paragraph 4-48 on page 4-19 of the manual,Adjust R72 and R26 respectively, and finally stabilize TP3 at 0mv.

If a 50 ohm load is connected to the 8920A input interface, the analog pointer will no longer fluctuate.
If the 8920a input interface is not connected to a 50 ohm load, the analog pointer will still fluctuate when the "LO RANGE ENABLE" is pressed.
is this normal?

After adjustment, I conducted another accuracy test. Here is the test picture:
Harry_22:

--- Quote from: daisizhou on June 21, 2024, 11:47:44 am ---
If the 8920a input interface is not connected to a 50 ohm load, the analog pointer will still fluctuate when the "LO RANGE ENABLE" is pressed.
is this normal?

--- End quote ---
This is Ok.


--- Quote from: daisizhou on June 21, 2024, 11:47:44 am ---After adjustment, I conducted another accuracy test. Here is the test picture:

--- End quote ---

You need another more precise voltmeter to do this test.
daisizhou:

--- Quote from: Harry_22 on June 21, 2024, 03:21:57 pm ---
--- Quote from: daisizhou on June 21, 2024, 11:47:44 am ---
If the 8920a input interface is not connected to a 50 ohm load, the analog pointer will still fluctuate when the "LO RANGE ENABLE" is pressed.
is this normal?

--- End quote ---
This is Ok.


--- Quote from: daisizhou on June 21, 2024, 11:47:44 am ---After adjustment, I conducted another accuracy test. Here is the test picture:

--- End quote ---

You need another more precise voltmeter to do this test.

--- End quote ---

12 hours later, I conducted the experiment again. Please see the video below.

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