[ARC5] Scope Question

[Kenneth G. Gordon]

On 20 Mar 2018 at 11:32, Robert  Eleazer wrote:

> I am troubleshooting a Tektronix 2236 scope.  Tektronix says to use another scope to do that.  
> Now, the general settings they say to use for the test scope says for the coupling switch, which 
> offers the options of AC, Ground, and DC, is to use "Ground."  I set the coupling to Ground and I 
> don't get any reading.

Yes. You won't. Tek's manuals do have some errors, and that is one of them. "Ground" 
connects the input to ground so that there is no input signal reaching the following stages. I 
usually use that "ground" setting to set the vertical centering of the trace so that when I then 
switch to DC, I can measure any DC-offset in the signal I am viewing. Otherwise, I use AC.

> Does this make sense to y'all?

Well, it makes sense that you are not seeing anything with the "other"scope's input set to 
ground, but it most certainly does NOT make sense that Tek's manual would tell you to set 
the input at "ground" to view the signals.

>  I get readings with either DC or AC coupling selected.  The 
> signals being measured are all pulsating DC voltages of various kinds, such as square waves, 
> triangle waves, etc..

Then use the DC setting if you want to measure any DC offset in the signals you are 
viewing, or AC if you want to ignore any DC off-set.

Ken W7EKB

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