[time-nuts] R-S Cesium standard

[EWKehren at aol.com]

Bill 
Thanks for the info. It is obviously Rohde&Schwarz. Funny!  All  other 
units I have seen or owned did have a beam current reading, have not been  able 
to find it on these units. Besides Voltages it has oven,  contr.  Voltage, 
integrator, AMPL. and 2nd Harmonic. I still have two cesiums and  several 
rb.s and have worked on quite a few, so I am very familiar with the  subject, 
the problem is that I am trying to help a friend over the phone and  find out 
what he has and how good the units are before he puts them up for sale.  
One has the green light on but I would like to know what the beam current is,  
also which OCXO. The OCXO will make the biggest difference.
Bert Kehren
 
 
In a message dated 10/26/2010 11:05:21 A.M. Eastern Daylight Time,  
bill at iaxs.net writes:

Didn't  know that Radio Shack made Caesium standards. 

Any phase-locked loop  contains an integrator that has the phase
error as its input. The output of  the integrator is then amplified
to produce the control signal for the  voltage-controlled oscillator.

The integrator output settles at some  voltage that causes the phase
error to go to zero (until something  changes). This voltage has a
range, like +/- 10 volts, where it is able to  vary the VCO. When
the voltage reaches either limit, the integrator is said  to be
saturated. I'd expect the Integrator meter to show the output  of
the integrator. Normally, you'd trim the VCO to center the meter  at
zero.

If the meter saturates in either direction, the PLL is  open, which
means that the integrator output isn't getting to the VCO, or  the
VCO isn't varying, or the phase detector isn't detecting, or  the
integrator is bad, or anything else that would break the  loop.

The Amplifier probably isn't the one after the integrator, but  is
the one that amplifies the output of the physics package. In a  Rb
standard, the physics package is the phase detector for the  PLL.

Bill Hawkins


-----Original Message-----
From:  EWKehren at aol.com
Sent: Tuesday, October 26, 2010 9:04 AM

Does any  one have any info on the RS cesium standard. Specifically does
anyone know  what switch position 7 Integrator and position 8 Amplifier 
measure?   Any help will be appreciated. Thank  you.
Bert  Kehren



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