Re: Like to say hello and ask a question about my Tektronix 465 ocsilloscope

Mike Dinolfo All Messages By This Member #208765 Wilfred: All of the capacitors that you mention are part of the power supply, and their ripple is not specified, as they are part of pre-regulator circuitry.? Can you check the regulated DC voltages and determine if the ripple on the DC voltage buses are within limits?? These limits should be specified somewhere in the service manual(s) (refer to w140.com).? If the service-manual-specified limits for ripple on the various regulated DC buses are within limits, you should be fine. If I am missing something here, that others are aware of, please let me/us know! Mike N4MWP toggle quoted message Show quoted text On 3/12/25 15:36, Wilfred via groups.io wrote: Hello again, It's been a while since I wrote and had to say goodbye to my 465 oscilloscope, but I managed to find another one and luckily without any issues. The serial number is 109003, which is I understood one of the latest. (Not sure though) Anyway, I did a check on the power supply voltages and the big capacitor's ripples between the plus and minus on the Elco itself: C1512 (550uF) 79V and 300mV ripple, C1513 (1200uF) 74V and 1V ripple, C1542 (5500uF) 23V and 1.5V ripple, C1552 (50009uF) .2V and 700mV ripple, C1562 (3000uF) 12V and 1V ripple. Any idea if this is acceptable ? It might be wise to replace them in the future, but for now I just leave it as it is and use the oscilloscope it was made for. Thanks again and have a lovely evening, Wilfred

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