Fly back transformer - voltage?

[Z]

What are typical voltages P/P or RMS on fly-back transformers, anode
cups etc?
I'm looking at HV probes for my oscilloscope. a 2kV one is cheap enough
but 15kV is a little out my budget for a few weeks.
Would 2kV suffice for most requirements; domestics, motor controllers,

--
Z
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[Art]

The voltages on the LOPT would not be relevant to those of motor
controllers, etc. The average tele or monitor may have up to 28KV, therefore
your probe would need to have insulation that would stand up to that
potential. In common use I have never seen anyone actually attempt to
connect a scope probe to the HV lead of a LOPT but they do check the pulses
at the base and collector of the horizontal output device, pulses there may
exceed 2 KV P/P voltage. A good probe will withstand that potential without
any problems. IMHO the 2KV probe, for general uses, would be sufficient.
"Z" <post@imaris.demon.co.uk> wrote in message
news:l4AodvUebpoAFwNg@imaris.demon.co.uk...

What are typical voltages P/P or RMS on fly-back transformers, anode cups
etc?
I'm looking at HV probes for my oscilloscope. a 2kV one is cheap enough
but 15kV is a little out my budget for a few weeks.
Would 2kV suffice for most requirements; domestics, motor controllers,

--
Z
Remove all Zeds in e-mail address to reply.

 

[Z]

In article <Qr-dnaiESIW4Pj_dRVn-sA@comcast.com>, Art
<stubby@comcast.net> writes

The voltages on the LOPT would not be relevant to those of motor
controllers, etc. The average tele or monitor may have up to 28KV, therefore
your probe would need to have insulation that would stand up to that
potential. In common use I have never seen anyone actually attempt to
connect a scope probe to the HV lead of a LOPT but they do check the pulses
at the base and collector of the horizontal output device, pulses there may
exceed 2 KV P/P voltage. A good probe will withstand that potential without
any problems. IMHO the 2KV probe, for general uses, would be sufficient.

Thanks I am not sure if it is the txfmr at fault or a problem with the
lead or anode cup so wanted to check the O/P of the txfmr. I daren't
use a DVM.
Symptoms: thin line across screen colour burst apparent on line, tapping
guard with screwdriver sometimes brings back framing.
No apparent dry joints around txfmr, board a bit discoloured beside
other unidentified component. Holding off looking at it until have all
tools to look at it as have spare television.

The cheap one (2kV voltage divider based probe) has un-insulated BNC
plug which is v. slightly concerning in case I'm not watching what I'm
doing some day.

"Z" <post@imaris.demon.co.uk> wrote in message
news:l4AodvUebpoAFwNg@imaris.demon.co.uk...
What are typical voltages P/P or RMS on fly-back transformers, anode cups
etc?
I'm looking at HV probes for my oscilloscope. a 2kV one is cheap enough
but 15kV is a little out my budget for a few weeks.
Would 2kV suffice for most requirements; domestics, motor controllers,

--
Z
Remove all Zeds in e-mail address to reply.

--
Z
Remove all Zeds in e-mail address to reply.

 

[Art]

Horiz Line indicative of failure in the vertical deflection circuit. Since
there is a line on the screen the HV is working and the tube is working.
Check the caps in the vertical deflection circuit, you also may need to
change the vertical output device. BTW please post the make and model of the
item your attempting to repair, the n/g will gladly post device specific
repair information in response.
"Z" <post@imaris.demon.co.uk> wrote in message
news:l4AodvUebpoAFwNg@imaris.demon.co.uk...

What are typical voltages P/P or RMS on fly-back transformers, anode cups
etc?
I'm looking at HV probes for my oscilloscope. a 2kV one is cheap enough
but 15kV is a little out my budget for a few weeks.
Would 2kV suffice for most requirements; domestics, motor controllers,

--
Z
Remove all Zeds in e-mail address to reply.

 

[Z]

In article <SOSdnZOrKqh42D7dRVn-hA@comcast.com>, Art
<stubby@comcast.net> writes

Horiz Line indicative of failure in the vertical deflection circuit. Since
there is a line on the screen the HV is working and the tube is working.
Check the caps in the vertical deflection circuit, you also may need to
change the vertical output device. BTW please post the make and model of the
item your attempting to repair, the n/g will gladly post device specific
repair information in response.
"Z" <post@imaris.demon.co.uk> wrote in message
news:l4AodvUebpoAFwNg@imaris.demon.co.uk...
What are typical voltages P/P or RMS on fly-back transformers, anode cups
etc?
I'm looking at HV probes for my oscilloscope. a 2kV one is cheap enough
but 15kV is a little out my budget for a few weeks.
Would 2kV suffice for most requirements; domestics, motor controllers,

--
Z
Remove all Zeds in e-mail address to reply.


I got the 2kV probe which was all the RS trade counter had in stock. It

unfortunately does not have a shrouded BNC plug so I'm toying with the
idea of returning it and just getting a 15kV one.
--
Z
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