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Author Topic: TEK DM501 multimeter  (Read 1778 times)

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Offline frantisekTopic starter

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TEK DM501 multimeter
« on: December 12, 2021, 03:16:36 pm »
Please help with DM501 repair. It worked normally about 2 years ago. It will now display a random number and a decimal point when turned on. The display does not respond, only the decimal point switches when changing ranges.The display shows, for example, -1.0480 when -1 is constantly lit and the decimal point with the rest flashes. I don't have pulses on transformer T300, anode CR310. Pin 9 U310B has a correct 5Hz rectangle, but it no longer passes through the C310. The transformer, diode and capacitor are OK.I would insert the diagram, but I don't know how. Thank you very much in advance for any help!
« Last Edit: December 12, 2021, 04:27:17 pm by frantisek »
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Offline frantisekTopic starter

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Re: TEK DM501 multimeter
« Reply #1 on: December 18, 2021, 09:23:18 am »
So the multimeter is repaired. Thank you to everyone who was willing to help .... :(
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Offline alm

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Re: TEK DM501 multimeter
« Reply #2 on: December 18, 2021, 11:15:10 am »
Could you post how you repaired it, so you can at least help future people having the same problem?
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Offline David Hess

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Re: TEK DM501 multimeter
« Reply #3 on: December 18, 2021, 01:12:40 pm »
When I repaired my DM502, it had a shorted tantalum capacitor.
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Offline THDplusN_bad

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Re: TEK DM501 multimeter
« Reply #4 on: December 19, 2021, 05:03:06 pm »
Good Day,

a friendly hint: For expert advice and tips for your next repair of Tektronix T&M equipment, you may also want to join https://groups.io/g/Tektronix

Cheers,

THDplusN_bad
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Offline frantisekTopic starter

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Re: TEK DM501 multimeter
« Reply #5 on: January 09, 2022, 11:45:12 am »
KO Q245.
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Offline David Hess

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Re: TEK DM501 multimeter
« Reply #6 on: January 10, 2022, 02:29:27 am »
That is an odd one to fail.  The others of the same type might be marginal from old age.
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Offline JacobPilsen

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Re: TEK DM501 multimeter
« Reply #7 on: January 11, 2022, 07:57:46 pm »
What about NiCd battery ?
Changed ?
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Offline frantisekTopic starter

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Re: TEK DM501 multimeter
« Reply #8 on: January 12, 2022, 06:28:51 pm »
Still to find faults. I highly recommend the digital oscilloscope! I never saw very narrow needle pulses on the analog ...
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Offline frantisekTopic starter

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Re: TEK DM501 multimeter
« Reply #9 on: January 12, 2022, 06:31:21 pm »
Where would the battery come from? :-//
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Offline JacobPilsen

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Re: TEK DM501 multimeter
« Reply #10 on: February 06, 2022, 07:10:49 pm »
Ordinary shop, maybe ges.cz

I did not use the exact same battery size.
Only the same voltage, ie the number of cells.

(It was just better than a completely dead battery.)
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