Re: Tek 310: 10Ω dropping resistors for diode bridges

stan mcintosh <mcintosh@...>

Ooops! After this message, I looked more closely at the schematic. I thought I was reading a 7V drop across the dropping resistor for the -150V line. The decimal point was not that obvious... until I looked for it.



----- Original Message -----
From: Carl E. Davidson
Sent: Tuesday, September 16, 2003 11:20 AM
Subject: [TekScopes] Re: Tek 310: 10Ω dropping resistors for diode bridges

10 ohm 1 Watt resistors are all that's needed here (this is what
Tektronix used in the later model 310A that had silicon diode
rectifiers). The purpose of these resistors is to limit the
surge current through the rectifier diodes when power is first
applied (when the filter capacitors essentially represent a
short circuit for the first few milliseconds).


--- In, "stan mcintosh" <mcintosh@t...> wrote:
> Several people have emphasized that I need to be sure to include
10Ω dropping resistors for the silicon diode bridges that are
replacing the selenium bridges.
> Question: what wattage? Seems like 10W will be good for the -150
line, but I don't have more than one 10Ω/10W resistor in le boxe du
junque. Is 10W overkill for the other two bridges? If not, I can go
by and see if Radio Shack still carries them.
> stan
> [Non-text portions of this message have been removed]

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