Oscilloscope Help

[Sadlercomfort]

Hi Guys,

I'm trying to measure a small signal change when i connect a 9v battery to a remote while nothing is pressed, to see how the remote discharges the battery when sitting.

I cant seem to get a good signal on my oscillate and there seems to be a lot of noise. Any ideas?

See a pic:

http://s29.postimg.org/52h888jp3/20160330_141547.jpg

 

[shrtrnd]

I can't see your picture because of my computer set-up.
Have you set your scope for 'DC'?

 

[Sadlercomfort]

Yeah its set to DC

 

[Sadlercomfort]

I've accidentally solved the problem.. somehow

 

[BobK]

What is it you are measuring on the scope?

The remote will likely draw uAmps when no button is pressed.

Bob

 

[Sadlercomfort]

Thats exactly what I'm trying to measure.. uA's.

I measured a current draw of less than 1.4uA on a digital multi-meter. I was hoping to confirm/verify my results.

Somehow the lines have disapeared and i can now see a continuous signal, but I still can't see the difference when i connect the battery to the remote.

Perhaps I over estimated the sensitivity of the oscilloscope, it seems to go as low as 20mV/Div. I need something like 1mV/Div

 

[dorke]

I wouldn't go this way at all.
The standby current of remote controls is sub-mA you wouldn't be able to see any change in the Battery Voltage with a scope.

What you can do is use a sensitive Ampere-meter(μA).
If you don't have a digital one, you can use an old analog Ampere-meter or just a "bare meter"(50μA FS).

Or a sensitive DVM(μV scale preferable ) with say a 1-ohm or 10-ohm series resistor to measure the Vdrop on the resistor and calculate the current.
e.g assuming your Stby current is 100μA
you would get a 100μV with 1-ohm and 1mV with 10-ohm.

 

[Sadlercomfort]

Yeah think your right dorke, isnt going to work out.

I have already obtained some results in (μA) using a multimeter.. this will have to do!

 

[Sadlercomfort]

Yay VIP!