[ARC5] Scope Question

[Michael Hanz]

I've seen that procedural step sometimes used on the later solid state 
scopes to reduce the chances that you will start a measurement with the 
sensitivity switch set at, for example, .01v/CM, when you are about to 
measure say 800v p-p.  Transistors don't like that. It's a last "do you 
really want to do this?" check before you make the measurement.  The 
older tube input scopes are pretty immune to such errors.

Or, it may be a manual error, as you suggest.:-)

  - Mike  KC4TOS

On 3/20/2018 11:52 AM, Kenneth G. Gordon wrote:
> 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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-- 
Michael Hanz - KC4TOS