RE: Metering my x-ray supply (fwd)

[<sroys@xxxxxxxxxxxxxxxxx>]

---------- Forwarded message ----------
Date: Wed, 10 Nov 2004 15:10:25 -0600
From: Carl Litton <Carl_Litton@xxxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Cc: humanb@xxxxxxxxxxxxxxxxxxx
Subject: RE: Metering my x-ray supply (fwd)


Hi David,

Just so happens I finished mine yesterday.  Capable of measuring nearly
a megavolt, I think it will come in handy with our current megavolt
project.  The main resistor is 1 GigOhm and the divider is about 1.18
MegOhm.  The whole of the 'A' resistor is being put into a 4" PVC tube
with external connections to HV and the "B" resistor.

The A or voltage reducer is a chain of 2 x 120 Meg 150KV, 2 x 300 Meg 75
KV, and a terminal chain of 10 and 30 Meg resistors totaling an
additional 160 MegOhm.  The 'B' or divider resistor is a 2 Meg precision
pot tuned to give the correct reading.  The readout on the DMM is in
Kilovolts directly.

Carl Litton


-----Original Message-----
From: High Voltage list [mailto:hvlist@xxxxxxxxxx] 
Sent: Wednesday, November 10, 2004 9:20 AM
To: hvlist
Subject: Metering my x-ray supply (fwd)

Original poster: <sroys@xxxxxxxxxxxxxxxxx>



---------- Forwarded message ----------
Date: Tue, 9 Nov 2004 18:22:21 -0800
From: David Trimmell <humanb@xxxxxxxxxxxxxxxxxxx>
To: 'High Voltage list' <hvlist@xxxxxxxxxx>
Subject: Metering my x-ray supply

Hi all, I am interested in making or possibly buying a high voltage
probe,
so I am interested if anyone has any tried designs. Also where would I
get
the mega-OHM resistors cheaply? On the other hand if I could find a 40KV
probe for less then ~$50 I would love to trade or purchase it! ;-)

I also need to find a reliable way to measure the tube filament DC
current.
Anyone have a reliable method using easily obtained parts?

Thanks,

David Trimmell