Re: Measuring how dirty the power is


Bryan Martin wrote:
Voltage has remained stable. I have also attempted to place a 10ohm
resistor in series with the supply along with a 10uf compacitor from VSS to
ground to try to clean it up but that didnt work either. In the data ***
it says I need to keep the noise and "hash" below 20mV for which I was
trying to see how I could see the 20mV without a scope.

I am using a 12volt DC power supply which hits a voltage regulator to knock
the voltage down to 5V for the module. I have tested this with no other
components other that the transmitter/recv'er and also by using the above
reference to try to clean it up all w/out success. Voltage stays consistant
from power up and during transmit. Can you think of anything else?


Well you could try switching the meter to AC and see if you read
anything both at the 12V and 5V point. If it is ripple the regulator
should take care of it but if it is spikes they may be passing thru
regulator. Try some capacitance on both the input and output of the
regulator.
Also check you grounding. how far apart are the devices?

It is really tough to solve this kind of problem without knowing what
is really going on.

Dan H

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