Re: [time-nuts] HP5065A Rubidium question

2017-02-20 Thread Poul-Henning Kamp
In message , cdel...@juno.com writes: One trick I have found useful is to measure the voltage over the big choke in the power supply to tell you how much power is being used. The lamp uses around 3W when lit.

Re: [time-nuts] HP5065A Rubidium question

2017-02-20 Thread paul swed
Scott do not know if anyone responded to you. Looks like a lot is working. But the devil is in the details. On the lamp measure the current feeding the lamp oscillator. That may give you a hint thats its running. If its 15 ma then most likely its not oscillating. Would be good to know what tools

[time-nuts] HP5065A Rubidium question

2017-02-20 Thread cdelect
Scott, If you pull the SMB lamp connector off of the chassis jack you can Ohm out between the center pin and shield. Try both polarities of the leads. If the 1330 Ohm resistor is good you should read around 3330 Ohms. This is the sum of the 1330 and a 2000 Ohm resistor. The 12 Ohm (selected)

Re: [time-nuts] HP5065A Rubidium question

2017-02-20 Thread Scott McGrath
Get the manual because if it's been off a long time the RB migrates out of the reservoir and coats the bulb so light does not escape There is a built in 'cold trap' which is used to return the Rb to the reservoir Using this is version specific and you need a good power supply as you can

Re: [time-nuts] HP5065A Rubidium question

2017-02-20 Thread timeok
Hi Scott, I have never find a photodiode faulty. When applied 20 volts to the lamp it should come on within about 10 seconds, and the PHOTO I meter on the panel will be between 20 and 50. If this does not happen the most probable failure is the resistance R1 on the lamp board (1330ohm

Re: [time-nuts] HP5065A Rubidium question

2017-02-20 Thread Bill Hawkins
Well, if it was not working when you acquired it, the physics package had probably reached the end of its life. If it had been working recently and is not now, it might be repairable. Others on this list know more about repairing than I. Bill Hawkins -Original Message- From: David

[time-nuts] HP5065A Rubidium question

2017-02-19 Thread David Scott Coburn
I have an HP5065A Rubidium Frequency Standard which is not working. All of the oven temperatures look OK. The power supply voltages look OK. The ~60 MHz going into the RVFS package looks OK. The 5.000 MHz and the ~5.315 MHz signals are within a few Hz. (The unit is running open loop only.) The