All, Recently purchased a 5061A with a option 004 beam tube yes, yes I know about the lifespan of these tubes (anyone have any spares for sale?) however the tube looks MUCH newer than the 5061A Ion pump is about 10 at turn on and drops to near zero after an hour or so.
Hot wire ionizer resistance shows correct resistance varies between .6-.8 on a fluke 83 The bad >From the -2500 V power supply test point I read - .210V which appears to be incorrect as the electron multiplier voltage on tube is -1691 V I have been thinking about replacing the R31 and R33 resistors with 20 turn pots adjusted to the tube values as the resistors do not seem to match the tube values. 21.41Khz @ 1VRMS injection to LF coil does not affect beam current Cs Oven 25 Crystal Oven 30 Ion Pump 0-1 Beam 0-1 Mult (Off the scale) Error reading 0 Control reading 0 2nd harmonic 0 5 Mhz 35 1 Mhz 0 (Think this is a metering problem as 1 MHz is available at the output at specified voltage) 100 Khz 35 5 Mhz Oscillator is on target it's within 6E10-10 of my Rb standard which according to my Austron 2100 has an offset of 3E10-12 Based on this information where should I begin my troubleshooting efforts? _______________________________________________ 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.
