01-07-2023, 01:43 PM
I have just bought a couple of these probes to replace one identical looking one which has just broken - the switch is dodgy and the signal is erratic. I can't complain It too was very inexpensive and did all I needed for several years. I found this post whilst googling a problem I found when trying to compensate the new probes to my 'scope.
However although the supplied plastic crosspoint screwdriver does just fit into the compensation trimmer slot with a good push I cannot get the expected range of adjustment, it always looks undercompensated with round corners although it is nearly there. I opened up the compensation housing to have a look, cant see any way to help matters although there is an unpopulated component position, adding a small capacitor there makes it worse.
I decided to remove the trimmer altogether and now by good luck the probe is satisfactory. My oscilloscope is a bit old now and has input of 1Mohm and 47pF. The old probes compensation adjustment was just fine. Perhaps these are more suited to modern 'scopes with lower capacitance inputs.
hth David.
However although the supplied plastic crosspoint screwdriver does just fit into the compensation trimmer slot with a good push I cannot get the expected range of adjustment, it always looks undercompensated with round corners although it is nearly there. I opened up the compensation housing to have a look, cant see any way to help matters although there is an unpopulated component position, adding a small capacitor there makes it worse.
I decided to remove the trimmer altogether and now by good luck the probe is satisfactory. My oscilloscope is a bit old now and has input of 1Mohm and 47pF. The old probes compensation adjustment was just fine. Perhaps these are more suited to modern 'scopes with lower capacitance inputs.
hth David.
