Guyzz
I just got a Racal 9480 with OCXO & 40 10Mhz outputs - (8x 5 chan) from KJDS
Update: The 9840 has an Opt 04B sticker on the back , so i suppose its a 04B OCXO inside it , also used in some of the 1991/2 counters.
And decided to connect it to my Phillips PM6680B
My HP 5370 has a fan, and SWMBO hates fannoise
![Cry :'(](https://www.eevblog.com/forum/Smileys/default/cry.gif)
I'm using my Tbolt GPSDO as input on the PM6680B ext-ref.
Racal ontime is approx 45 hr's , so the OCXO hasn't settled yet. And i haven't adjusted it yet.
Just logging the stability.
Playtime ....
http://www.ebay.de/itm/351323826114Measuring the :
Racal 9480 with OCXO & 40 10Mhz outputs - (8x 5 chan)
I have fumbled around with my PM6680B (ext ref Tbolt GPDSO) , linux-gpib python bindings , and a Beiming USB-GPIB adapter (100% HP Compatible)
I'm measuring on one of the 40 outputs , not the master in front (I want to see it from a clients side)
#
# Line looks like this : 1 2 3 4 5 6 7 8 9 10 11
# measline Collums : Date;Time;DateTime;Temp;F-Max;F-Min;F-Mean;F-SDEV;
#
# 1 2 3 4 5 6 7 8
# 2015-03-21;08:47:39;2015-03-21T08:47:39;24.5625;+9.99999886905E+006;+9.99999886353E+006;+9.99999886717E+006;+1.51490921548E-003;
#
Output (.csv)
2015-03-21;08:42:23;2015-03-21T08:42:23;24.5625;+9.99999887083E+006;+9.99999886348E+006;+9.99999886857E+006;+2.14294251018E-003;
2015-03-21;08:42:34;2015-03-21T08:42:34;24.5000;+9.99999887071E+006;+9.99999886380E+006;+9.99999886809E+006;+2.18569307406E-003;
2015-03-21;08:42:46;2015-03-21T08:42:46;24.5625;+9.99999887181E+006;+9.99999886591E+006;+9.99999886918E+006;+1.99033610964E-003;
The counter is saving 10 readings , 1 sec trigger , and doing statistics on the readings.
I'm just reading out the 4 statistics values , and retriggering the counter for 10 more readings.
Seems like there is a 1s overhead , so each measurement is 11 sec apart
But it was a "tough" , but learning experience.
Mostly to figure out the PM6680B commands.
But i actually spent the most time fumbling with detecting the REQ bit on the GPIB-Bus , from inside the linux-gpib python bindings.
The Racal can also take the Tbolt 10Mhz as input , and will automatically detect an ext-ref and switch from OCXO to Ext-ref.
But i'm testing the OCXO now, turnon time approx 45 hours , so the OCXO is prob not stable yet
I guess i'm fit with enough channels for my instruments for now.
Attached some newly created .csv files from my python script
Any suggestions (examples) for fun measurements are welcome.
Edit: Added some more measurements
/Bingo