[ARC5] Scope Question

[Jim Wiley]

Wayne -


The switch setting "ground"  means "disconnect the incoming signal going 
into the scope and ground the scope signal path,so the input INSIDE THE 
SCOPE is connected to ground".

Or to put it another way,  internally inside the scope the "ground" 
setting opens the circuit connecting the signal from the external probe 
(or input cable) and the oscilloscope internal amplifier so there is 
noconnection from the outside world, and instead shorts the vertical 
amplifier input to ground.

The other two settings are used to set the vertical amplifier as a DC 
coupled or AC coupled amplifier, to display signals.   The "ground" 
setting is used so the operator can make sure there is no external 
signal coming in, and can thus get the trace"on screen" somewhere so he 
or she can see it (giving a place to start).

I hope this makes sense.


- Jim, KL7CC




On 3/20/2018 7:32 AM, 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.
> Does this make sense to y'all?  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..
> Thanks,
> Wayne
> WB5WSV
>
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