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Title: DSO4102c Frequency calibration of the built-in generator and frequency counter. [Print this page]

Author: pavlenkoa Time: 2020-4-16 22:58
Title: DSO4102c Frequency calibration of the built-in generator and frequency counter.
Edited by pavlenkoa at 2020-4-16 23:01

Here are the readings of the frequency meter from the built-in 10 MHz generator
[attach]3499[/attach]
[attach]3501[/attach]
I ask you to pay attention to the difference in readings.

But the readings of the built-in frequency meter from an external reference generator of 50 MHz.
[attach]3500[/attach]
[attach]3502[/attach]
Error again.

It should be noted that the oscilloscope warmed up for 1 hour, then was reset to the default settings and an internal calibration was performed.
Questions:
1. How to calibrate the built-in generator.
2. How to calibrate the built-in frequency meter.
Is there an engineering menu for performing calibration?
If not, it must be foreseen, since the above errors make work with the device pointless. This is a digital device, not an analog one.
I hope for an answer. Thanks in advance.

Author: wangshuang Time: 2020-4-20 16:46

Please give me the device information: UTILITY->System Information. I test my device, it has no issue on these question.

Author: pavlenkoa Time: 2020-4-20 23:17

wangshuang replied at 2020-4-20 16:46
Please give me the device information: UTILITY->System Information. I test my device, it has no i ...

Model: DSO4102C
sw version: 3.50.0(200410.0)
hw version: 1020xffffa000
serial number: T 1G/049 006360
boot count: 113
upgrade count: 2
lcd.front.ts: 3.0.0

Author: wangshuang Time: 2020-4-22 15:48
Please update the FW to this version:
https://fil.email/FK0AC5ez

Author: pavlenkoa Time: 2020-4-22 19:25
Edited by pavlenkoa at 2020-4-23 01:07

wangshuang replied at 2020-4-22 15:48
Please update the FW to this version:
https://fil.email/FK0AC5ez

Thank you so much! The frequency of the built-in generator is now displayed correctly![attach]3536[/attach]

But the frequency of the external precision generator is displayed with a constant error in the low order, equal to the number in the high order.
10 MHz> 10.0001 MHz
20 MHz> 20.0002 MHz
30 MHz> 30.0003 MHz
40 MHz> 40.0004 MHz
50 MHz> 50.0005 MHz
As I understand it, this is a mismatch between the frequency of the internal master oscillator and the frequency of the external precision oscillator. Is it possible to calibrate the built-in generator by manually amending the engineering menu? Is it possible in the future to implement this feature in new firmware?
[attach]3537[/attach]

Thank you very much, I am very grateful to you that you respond so quickly and positively to our questions and correct the code, where appropriate!

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