Follow-up HP 3456A
So, this is my second try, hopefully I'll find this time the correct crystal.
![Roll Eyes ::)](https://www.eevblog.com/forum/Smileys/default/rolleyes.gif.pagespeed.ce.XcUK202Yqt.gif)
I've opened the bottom and removed the black aluminium shielding.
Yes, there it is:
![](https://i.imgur.com/wYfHwUS.jpg)
But what is this? What is this strange angle of the board?
![Shocked :o](https://www.eevblog.com/forum/Smileys/default/xshocked.gif.pagespeed.ic.CrwtrNUjLO.png)
![](https://i.imgur.com/BEaBWb3.jpg)
Somebody had removed the board and did not put it back correctly.
![Face Palm :palm:](https://www.eevblog.com/forum/Smileys/default/xfacepalm.gif.pagespeed.ic.EBDwh1hCfo.png)
I installed the board correctly. Much better this way.
I've measured the signal on TP 1 before I'm going to replace the crystal.
![](https://i.imgur.com/0EVI3xT.png)
Crystal replaced, checking again the signal. It is a bit stronger now.
![](https://i.imgur.com/lztnixW.png)
I've put the original crystal in a plastic bag and stuffed it in a free corner of the 3456A.
Just in case.
Ok, let's do some measurements.
First, my 10kOhm 4-wire self-made calibration resistor:
![](https://i.imgur.com/iO4hKja.jpg)
Spot on!
![ThumbsUp :-+](https://www.eevblog.com/forum/Smileys/default/icon_smile_thumbsup.gif.pagespeed.ce._JElyJQqdB.gif)
Now checking with the 5V voltage standard from Mr. Malone:
![](https://i.imgur.com/NMWoDTA.jpg)
Not so bad.
![Cheesy :D](https://www.eevblog.com/forum/Smileys/default/xcheesy.gif.pagespeed.ic.KPzuH4J-TG.png)
I'll leave it alone for now until my 7510 is coming back from calibration.
Will do then some comparison and hopefully no adjustment is needed.
And, last but not least, I've found the little brother of El Capo:
![Azn ^-^](https://www.eevblog.com/forum/Smileys/default/azn.gif.pagespeed.ce.7t5xC2ZH_H.gif)