High voltage power supplies

[djsb]

Hi,
Just been watching the latest multimeter shootout video and noticed Dave using a Keithley high voltage power supply and current supply for testing the meters. What is the power supply model that's used and can anyone generally recommend a high voltage power supply? It would mainly be used to experiment with valve amplifiers and general lab use. Thanks.

David.

[rossmoffett]

I use a Variac and whatever high-voltage transformers I have around.  HV power supplies are expensive!

My line voltage is on the high end (~125 VAC) so I get almost 7 VAC on my filament taps.  Tubes will operate on as low as 5 VAC with no harmful effects, so that gives quite a bit of adjustment on the HV windings with a variac.  About +/- 50 Volts, depending on the voltage range you're working in.

[Simon]

well you could use a voltage doubler rectifying solution and maybe two of those in series if you want 1000 V if your just after low power, infact you could get as much as 1200 V, or maybe best using a proper multiplying rectifier circuit, but this only works on low power

[Kiriakos-GR]

My own question would be , how to measure  2000V  with one 1000V DMM ?   

[NiHaoMike]

My own question would be , how to measure  2000V  with one 1000V DMM ?   

Build a voltage divider.
http://repairfaq.org/sam/hvprobe.htm

[EEVblog]

I have 4 Keithley instruments:
240A high voltage PSU
225 Current Source
260 Nanovolt Source
261 Picoamp current source

Dave.

[alm]

Unless you are experienced in high-voltage construction, buying a HV probe would be the safer option. It's not like DMM HV probes are that expensive.