Author Topic: philips pm3230 oscilloscope test  (Read 1725 times)

0 Members and 1 Guest are viewing this topic.

Offline davy pelemanTopic starter

  • Regular Contributor
  • *
  • Posts: 53
  • Country: be
philips pm3230 oscilloscope test
« on: January 10, 2018, 02:49:19 pm »
i just purchased an old scope and i wanted to test it. so i took a little oscillator circuit i had laying around. it runs at 30 hz  and is powered with a small transformer (fully rectified and a 4700uf cap). now the signal has a lot of hum (60 cycle from the line). when i touch the positive probe and the transformer the hum is gone and i see an nice clean square wave. can someboby explain what is happening. should i ground the transformer? the scope could also use some new electrolitics, but still waiting on the order.
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf