How does one increase the EM voltage? I do have the manual and I have done the LF test but the ionizer and mass spec voltages were what I was looking for
On Tue, Sep 30, 2008 at 1:11 PM, corby d dawson <[EMAIL PROTECTED]> wrote: > Scott, > > The -.210 v one the multiplier is OK for now. The tube value is for when > the tube was originally tested. As the electron multiplier in the tube > ages the required voltage needs to be increased (up to a maximum of > 2500VDC). > > If you have a manual I would suggest that you do the low frequency test. > > It takes a frequency at 1/2 the zeeman frequency that you apply to a pin > on the underside of the unit on the long terminal board. > > This allows you to test the tube even if the RF circuitry is at fault. > > If the low frequency test fails then before blaming the tube you need to > get in and measure the ionizer voltage (older units a 1VRMS square wave, > new units 1VDC) and also measure the mass spectrometer voltage with the > pot at max CW (about +17 to 18VDC. > > If everything checks out but low freq. test still fails increase the EM > voltage to 2500VDC and repeat the test. > > If no low frequency response by now the tube has a high probability if > beaing dead! > > If the test is good then your problem lies in the RF circuitry > somewhere. > > Corby Dawson > ____________________________________________________________ > Click here to find affordable degree programs. > http://thirdpartyoffers.juno.com/TGL2141/fc/Ioyw6i3l8Op2dKMrmSXhHChrYqlJXFP6LXoDtx9dtYTJzdmc3WCvct/ > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
