Hi guys I'm looking for some advice on the best way to take a measurement. I recieved a notice from our DCS manufacture that noise on our dc power supplies can cause NVRAM failurea if the ripple is over 200mV. The paper also recommends replacing PS ever 5 years due to wear on filter caps and using a 500 MHz Oscope for taking measurements. I ended up using a 200 MHz fluke since it was the best I could get my hands on and my results were inconclusive.
First I had a hard time setting up the digital scope so I grabbed an old techtronics anaolg scope and got a reading of 700 mV. I tried to recreate the reading with the faster fluke with no luck untill I switched the probe. I got very little ripple with the 10x 200 MHz probe that came with the fluke but when I used a straight coax with bnc I matched results. So to get to the point should I be using a 1x probe for to measure low mV ripple or should the 10x be just as acurate at that low voltage. The specs on the 1x probe I used are unknown it was sitting in a drawer for awhile probely was in use around the same time as the older analog scopes.
Thanks for taking the time to read this long post lol
First I had a hard time setting up the digital scope so I grabbed an old techtronics anaolg scope and got a reading of 700 mV. I tried to recreate the reading with the faster fluke with no luck untill I switched the probe. I got very little ripple with the 10x 200 MHz probe that came with the fluke but when I used a straight coax with bnc I matched results. So to get to the point should I be using a 1x probe for to measure low mV ripple or should the 10x be just as acurate at that low voltage. The specs on the 1x probe I used are unknown it was sitting in a drawer for awhile probely was in use around the same time as the older analog scopes.
Thanks for taking the time to read this long post lol