Products > Test Equipment

Hantek 6022BE 20MHz USB DSO

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ronee:
con't,
so you see the meter reads 119.4 and my indersized resistor has let OpenHantek display this as 118 volts, not too shabby. This is a 24 volt wall wart feeding a small transformer backwards

Now how about 600 volts pk 2 pk on our 5 volt input? For this I used a 120 to 240 volt transformer. The transformer output was only 226 volts and Open H has this displayed as 220 volts, so down to the wholesalers and see if I can get some 900K resistors tomorrow and I will work on a front end:

Ron

rogerjames99:
The max input voltage on this acope is 35v not 5v.

ronee:

--- Quote from: rogerjames99 on October 14, 2020, 04:10:40 am ---The max input voltage on this acope is 35v not 5v.

--- End quote ---

Roger, with a 1X probe it is 5 volts. Here is screen shot at 10 volts PK/PK with the red ligh on at the bottom left. This is only 3.77 volts RMS.
Ron

rogerjames99:
Mea culpa.

My bad.
35v is the input protection level..

Max. Input +/- 5V(Without external attenuation)
Input protection 35Vpk(DC + peak AC < 10kHz)

Roger

ronee:

--- Quote from: ronee on October 14, 2020, 01:17:27 am ---  All this because I didn't have any 900K resitors to make just a resistor front end. Now that this works that will be my next step.

--- End quote ---

Well for the simple reason 900K is not in the series. So I ended up with a 680 K and a 220K in series. The capacitor is not show in the photos as I only put that in place once the unit was assembled. Not much selection in the ol' junk box... 14pf didn't do anything and 27pf as installed seems to be not too far over. I think 22 or 24pf would be a better choice but anyway here are a couple pics of the board and a run, the A channel is on rthe test pin and the B channel is from the B&K.

Both scope probes set to 1X. I was expecting the menu item "times" to be 1X, 10X, and 100X but it progresses by single digits? When I put it up to 10X it made the trace smaller and eventually quite.

So last post on this, I was just hoping to inspire 6022be owners to save their money on 100x  probes and build a simple 10X front end.

Ron

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