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Title: Calibration for Hantek 2D72 ? [Print this page]

Author: amy Time: 2021-3-9 09:58
Title: Calibration for Hantek 2D72 ?

Customer Consultation

Hello, I have just received the 2D72 Scope/DMM instrument.

I noticed that the DMM DC volts calibration is off, it reads too high a voltage.

Do you have a service manual, or can you supply me with the calibration procedure to re-calibrate the DMM portion?

I do have a DMM voltage standard that I use to calibrate with.

Thank-you

Author: amy Time: 2021-3-9 10:06
Reply

How much higher is the measured voltage than the input voltage?
Are other measurements tested correctly?

Author: Lane Time: 2021-3-11 01:28
The DC voltage for the DMM portion is reading 5.01v when it should be reading 5.00v. I have a DMM calibrated DC source, and also comparing it to a known good Fluke DMM. I realize this is not a large difference, but it would be beneficial to have the 2D72 DMM closer calibrated. I have only tested the 2D72 DMM DC voltage functions so far. The Scope portion appears to work well. Is ther an adjustment port on the 2D72's PCB that I could adjust to bring the meter into better calibration?
Thank-you.

Author: Lane Time: 2021-3-11 01:36

Lane replied at 2021-3-11 01:28
The DC voltage for the DMM portion is reading 5.01v when it should be reading 5.00v. I have a DMM ca ...

The DC voltage for the DMM portion is reading 5.01v when it should be reading 5.00v. I have a DMM calibrated DC source, and also comparing it to a known good Fluke DMM. I realize this is not a large difference, but it would be beneficial to have the 2D72 DMM closer calibrated. I have only tested the 2D72 DMM DC voltage functions so far. The Scope portion appears to work well. Is ther an adjustment port on the 2D72's PCB that I could adjust to bring the meter into better calibration?
Thank-you.

Author: amy Time: 2021-3-11 11:11
The measurement accuracy is mentioned in the technical parameters of the product, as shown in the figure below.

[attach]4269[/attach]

Author: Lane Time: 2021-3-11 13:57
Yes, I had realized the specifications, but is there an adjustment pot on the PCB that could be used to bring it closer and calibrate it?

Author: amy Time: 2021-3-12 16:52

Lane replied at 2021-3-11 13:57
Yes, I had realized the specifications, but is there an adjustment pot on the PCB that could be used ...

Sorry, it cannot be done.
If 5V is calibrated, the test deviation of other voltages will be larger.
In addition, this DMM has a resolution of 0.01V in the 40V range, not 0.001V. It depends on the hardware.

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