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Re: Help in using TEK Differential Amp to check Switchmode Supplies


 

"... adequate for 240 VAC work which is unlikely to produce higher than
+/- 340 volts DC...."

Erm, guys, if these are switched mode supplies on a 240V system, when
the switching transistor switches OFF, peak voltage on the switching
transistor \ primary winding can easily reach 500 volts or more! (I know
- I have had to design them and specify the Vds max of the switching
FET... we used to fit 600V Vds max for 230 \ 240V....). Think "car
ignition coil" on the primary side of the "transformer"....

A 240V supply might only produce 340VDC on the bulk cap, though....


David Thomas

On 16/11/2014 11:40, David davidwhess@... [TekScopes] wrote:
1. The x10 P6055 probes have adjustable DC attenuation but are only
rated to +/-
500 volts peak although I would consider this adequate for 240 VAC
work which is
unlikely to produce higher than +/- 340 volts DC. I do not have any
documentation on these probes.

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