Electronic – Tektronix’s 465B Analog Oscilloscope Volts/DIV’s Question

oscilloscope

I just purchased a used Tektronix 465B Oscilloscope and I am having some difficulty with the VOLTS/DIV knobs. Both channels have markings from 5mV up to 50V.

All of the settings work except for the 10, 20 and 50 volt settings. The knob will not physically turn to these settings. Its almost like its locked out or something. Has anyone had experience with this? I feel like I should be able to measure 120V on this hunk of machinery, however I am limited to a max of 20V. 🙁

Its also worth mentioning there is a x10 mag button located on the front. I don't think its what I am looking for. I have been able to locate a tech manual, but have been unsuccessful with an operational manual. Any experience with this would be greatly appreciated!

Best Answer

I imagine the 10, 20 and 50V markings are for when the probe is set to 10x. The dial should have two bands to correspond to 1x and 10x settings.

I have an old tek scope which does this - the highest you can turn to for 1x is 5V/div.

I just googled for a picture of the 465b and it looks like this is the case - notice there are two bands on each knob. On the bottom knob you can see one is at 1V/div and one is at 10V/div, which would correspond with 1x or 10x setting:

Tek 465b

EDIT - I have added arrows pointing to the bands to clarify things.

Related Topic