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Hi Tom, I have verified that the 50 MHz ref is turned on in the input menu. I would expect that should turn it on, as would the automatic alignment process. If there is another setting somewhere that

Did you make sure the cal signal was turned on?? You can turn it off on the E4401B.

Mike, I guess I cannot help w/o the CLIP. I'll take a look on Monday and get back to you. In the mean time, good luck! These are nice instruments to work on (except for all those screws!) Mark

Hi Mark, Thanks for the reply and the thoughts. From the info in my CLIP, the 50 MHZ CAL signal is generated by dividing the 800 MHZ 2nd LO by 16. The 2nd LO gets its power from the TEST MUX (U56).

Hello group, I can't remember if I have introduced myself in the past or not.? If my memory serves me correctly I might have.??Just to be safe,? I am Jon, and reside in Texas, USA.? Passion and

Hi Mike, I do not have my CLIP (it's at work) but I recently repaired a couple of these ESA's, although different issue. (LO UNLOCK error) As I recall, the 50 MHz is generated by a dedicated PLL that

I’m just trying to get the unit to do its own automatic internal alignment by doing selecting the “system->Alignment->Align Now” menu option. I am not tweaking stuff manually. I know the perils

In our quest to make a lot more space, we are blowing out our Tek and HP CRTs at stuff day. Any tube, just $10 each.? In just ONE room, I found all of these types, and there are two more large areas

If this were a SATA drive, you could use something like this: https://www.amazon.com/SATA-Hard-Drive-Duplicator-Eraser/dp/B00G6TG5YE Of course, the older PNAs use PATA drives, so you would be forced

I? have to agree with Peter,? please do not adjust any of those "loose screws"? it will be the end of life for that one unless you're ready to get real serious with band pass filtering alignment

Hello Mike, I would first check out that Local Oscillator, I suspect your's is not there.? If I recall the cal signal is derived from the root source (YIG LO) which is fed as a reference into the 1st

The only advice I can offer is not to adjust anything until you fix the problem. I don't have this instrument. Hopefully you have a good block diagram and a description to figure it out. You are lucky

Hi Peter, I am aware of the differences between a 75 ohm input and 50 ohm input. I have a 50 to 75 ohm impedance matching pad that I will be using on the input when measuring signals with a 50 ohm

Are you using 75 ohm components to calibrate it? You do realize that it will not work with 50 ohm components?

Greetings, I have an Agilent E4401B with option 1DP (75 ohm input) and option A4H (GPIB interface) that I recently found at a swap meet. It powers up, displays a trace, and when I apply a test signal

I'm surprised no one mentioned my post "8566A Battery Replacement" in the files section. The file is "8566A Battery.pdf". Recently (last few weeks) uploaded, there was a notification. There is a

Hi, If you already speak linux/unix - I've successfully cloned the disk on a E8358A by booting a linux live image from a USB stick and dumping the drive contents via 'dd' to a further USB connected

Oh yeah.? And I'll keep the EPROMs as well.? All this firmware, and all these versions need to be saved.

Peter Just be sure to archive the MATE/CIIL firmware. It is indeed rare! Daun ?Get BlueMail for Android ?

No, it's not there.? There are newer versions though so I may update while I'm in there.? I don't need any of the MATE or CIIL compatibility as I'll never use that.