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Hi Dave, Wow! Good news! I was so curious that I verified wich type of memory is used on USG board : RAM chip was MT4C4001JDJ-6 (FPM memory type). Here, I had an old 72 pin memory SIMM of 16Meg

I just went and looked at that. I found that same procedure on the eevblog forum, was that your post? I followed the procedure on my unit and it worked. There was one minor issue, though.

Woops - forget my reference to the 8558B in my prior response - too many threads. :) The remainder of the post is correct (i.e. look a the non-military manual for the unit). Ken

Again, this could be related to open resistors in the horizontal deflection amplifier output stage. Specifically I would check R238, R239, and R275. These are the component references from the 8558B

FWIW, could be old news for many, but I uploaded at ko4bb the required files to enable all software options on a 89410A. The archive is still in the upload area.

Thanks for the quick replies. Today I did find a complete military version of the HP 8558B manual with schematics. I'll start off with this and begin work on the SA, first checking and securing the

Right there with ya.. -Dave [hp_agilent_equipment] wrote: -- Dave McGuire, AK4HZ New Kensington, PA

Here are some random notes on the expansion options for the 89410A/89441A, for the sake of the archives. Second Channel -------------- It's possible to add the second input channel option

One last question for the night. Is there a component failure that would cause the beam/dot not to show on the screen when I apply low voltage to the test leads (1.5v battery) I have to hold the TEST

Cool. Thank you for the tip on where to check. I'm still trying to figure out if there are any settings I need to try without cracking the case open. I'll save this email for reference when I open it

Thanks for the help. What can I use for a signal? I don't have a signal generator. I tried testing it with a 3v 800ma wall wart using the EXT INPUT and didn't get a dot or anything. I tried using a

Unless there is a reason for extreme precision in your frequency measuring, you don't need to spend too much money adjusting the oscillator to a reasonable precision. The old method using WWV with a

Mine arrived today. Alas, it uses a USB B connector instead of a more common USB mini or micro; I gotta get a cable. Mine has the comparator IC marked only, "AJK BAA." Yes, this is an Analog Devices

What's wrong with my Rubidium reference that would make me choose a GPS disciplined? Costed me $75 on EPay, but still needs a power supply, case and diastribution amplifiers, yet another project to

I have the same equipment and don't need insane accuracy (1Hz in 100MHz is more the sufficient - 10e-8). I will put the 1PPS signal into the A input, the 10MHz from the ref osc out on the back into

They say coffee helps you live longer, I don’t know about how true that is but I do know that it definitely makes me enjoy the time I do have much more! Peter

?????? There are many of us who are slaves to coffee. Have few other bad habits but I can't even talk in the morning before drinking a cup. -- Richard Knoppow dickburk@... WB6KBL

Yes, works as advertised as far as I can tell. There is plenty of discussion and many screenshots

Two questions for the original poster: How accurate do you need (want) to be? and what are you using the counter for? Time and frequency precision can become an obsession - Time Nuttery. Robert

There has been discussion recently about generating fast rise/fall time pulses by various means. Here is a link to a Leo Bodnar device that will provide <40 ps rise/fall time, 50% duty cycle, 10 MHz