Hello Guys!
I tried to improve my knowledge about analog electronics, so I buyed the MK105.
On my oscilloscope I can see signals in all modes but sine wave-mode. The other Modes have max-Level of +/- 400mV.
The sine wave has much less level and the output signal is more a square wave. But it has needle-peaks.
If I connect a 470R parallel to output it is like a sawtooth or unstable square wave (level +/- 50mV)
If you are interested I can send pictures of PCB or oscillograph.
Is there anyone who can say that the sine wave-mode generates a sine like the graph which is shown in the manual and at which level it is generated?
What is the ideal output Resistor?
I don’t know if it is important, but I noticed a high frequence tone near the device.
Thank you!
This can be anything but most likely an assembly problem.
Can you supply links to PICs of both output and assembly?
Pictures of the PCB:
http://imageshack.us/photo/my-images/841/sig1lt.jpg/
http://imageshack.us/photo/my-images/689/sig2dg.jpg/
Here are the graphs:
http://imageshack.us/g/189/sourcei.jpg/
(9v-battery,mode1,mode2,mode3 and two times mode4 with different test probes)
any idea to fix that?
maybe an OpAmp?
Did you check all parts and values in sine generation part of circuit?
What is the input impedance of your scope?