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Author Topic: Gw Instek GDM-8055 Multimeter Teardown  (Read 3240 times)

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Offline vasi_roTopic starter

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Gw Instek GDM-8055 Multimeter Teardown
« on: November 25, 2016, 01:25:20 pm »
New multimeter in my lab.
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Offline vasi_roTopic starter

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Re: Gw Instek GDM-8055 Multimeter Teardown
« Reply #1 on: November 25, 2016, 01:26:33 pm »
more images
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Offline vasi_roTopic starter

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Re: Gw Instek GDM-8055 Multimeter Teardown
« Reply #2 on: November 25, 2016, 01:31:03 pm »
last set
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Offline Kleinstein

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Re: Gw Instek GDM-8055 Multimeter Teardown
« Reply #3 on: November 25, 2016, 02:00:54 pm »
Looks like a rather simple circuit. Just the 2 LM399 are really a surprise - even 6 digit meters usually have only one.
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Offline vasi_roTopic starter

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Re: Gw Instek GDM-8055 Multimeter Teardown
« Reply #4 on: November 25, 2016, 02:11:48 pm »
I think one of Lm399 it's the main refernce and the other one it's used for self calibration.
From the user manual :
GDM8055 feature internal calibration using known reference
resources. Multimeter automatically calculates the correction factors and stores it in
The calibration memory.

I was unable to find the service manual for this meter...
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