Author Topic: OSCILOSCOP FNIRSI-1013D defect  (Read 971 times)

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Offline Rollin Hand

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OSCILOSCOP FNIRSI-1013D defect
« on: July 13, 2020, 02:31:28 pm »
Hello I got one of those 30 mzh scope yesterday after almost 2 months waiting from china.. Is not my main scope I have 2 tek 724d.
The problem is on channel 2 with no signal it shows some garbage on top of the ch2 trace.more visible on the 50 mv sensitivity range,if I put the 1kc test signal it still there on top of the 1kc test signal.
If I move the sensitivity up to 5 volts the garbage almost goes  is barley visible .
By shorting channel 2  on the bnc does not change ,the same with a load of 50 ohms ho change.
Thanks
Rollin Hand
 

Offline Shiv

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Re: OSCILOSCOP FNIRSI-1013D defect
« Reply #1 on: July 13, 2020, 03:47:51 pm »
Does it have signal path compensation?

What kind of noise?
DC offset? AC? All?





 

Offline Rollin Hand

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Re: OSCILOSCOP FNIRSI-1013D defect
« Reply #2 on: July 13, 2020, 05:52:25 pm »
erratic  noise ,the main 2 channel trace stays stable is like when you touch a cabinet  and introduce noise on the scope.
no signal path on this scope it has a calibration ,it pass the calibration.Calibration makes all the relays inside the scope work.
« Last Edit: July 13, 2020, 05:55:06 pm by Rollin Hand »
 

Offline Shiv

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Re: OSCILOSCOP FNIRSI-1013D defect
« Reply #3 on: July 13, 2020, 08:06:50 pm »
Look for bad solder joints or bad connector in the only analog line that it have.

I think is a bad contact if fails at touch.
 

Offline cliffyk

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Re: OSCILOSCOP FNIRSI-1013D defect
« Reply #4 on: July 13, 2020, 10:41:41 pm »
At risk of being offensive, it is a cheap toy oscilloscope and while it certainly should meet it's claimed specifications; unfortunately when you buy the cheapest there is, you often get the cheapest there is.

Quality control is not a strong point on any of this cheap Asian crap...
« Last Edit: August 15, 2020, 02:29:14 pm by cliffyk »
-cliff knight-

paladinmicro.com
 

Offline Dd

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Re: OSCILOSCOP FNIRSI-1013D defect
« Reply #5 on: August 15, 2020, 10:41:22 am »
If I remember right I read in a comment under the local 1013D review that one guy has solved shifted DC level readings by cleaning input stages from factory flux residues and proper drying later on. So it might be worth a try.
« Last Edit: August 16, 2020, 08:33:41 am by Dd »
 

Offline Rollin Hand

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Re: OSCILOSCOP FNIRSI-1013D defect
« Reply #6 on: August 17, 2020, 06:40:52 pm »
Thank you Dd I will try your suggestion.
Rollin
 

Offline MadTux

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Re: OSCILOSCOP FNIRSI-1013D defect
« Reply #7 on: August 17, 2020, 06:51:57 pm »
Seems like the average lifetime of china garbage ;-D
 


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