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Hi Reg, The first thing I look at is the total Ontime and power-ups count. I have seen11801x/CSA803xx with useful display but Ontime of over 140 khrs. That must be due to some out-of-range condition;

Be careful what you wish for. Now I need to build a pulse generator with a fast enough edge to test it. I am still a bit amazed I was so lucky. though for a couple of hours I was going, " What have I

I'm envious of your scores!? Some day I will get back into owning and operating 11000 series gear....Jim Ford?Sent from my Verizon, Samsung Galaxy smartphone

No one in the US will have the ST part in stock until June! But someone in the UK has offered to get a couple for me there. I bought the scope for $100 plus $85 shipping because I knew what the E5622

This seems to be a common problem so I thought I would report on my repair. Summary: Apparently fixed by replacing the U500 hybrid with a known good one. Details: This is my main scope. In 2015 it

Tek 11801 Timebase Errors Tektronix 11801, 11802, and CSA803 sampling scopes eventually fail with an E5622 timebase error. If you remove the bottom panel, you'll see a cluster of sram chips... Two of

I'm not sure I can identify the board. There are a couple of boards with no markings. I reseated the 4 boards on the left side while checking to see what they are. the left two are a memory board and

What is the voltage on pin 28 of the two socketed rams on the timing and control board in the bottom of the unit?

My 11801 arrived today. On power up it makes two beeps and puts up two lines of text on the screen: Diagnostics in progress Comm Test in progress But does not go past that. The seller sent a picture

I have had several requests to list all the tek portables that will be at stuff day, so here's the info. We will be checking these next week, so status on every unit is still unknown as of today

/g/TekScopes/photo/86536/11?p=Name,,,20,1,0,0 Probing pins 2 and 6 of U220 reveals square waves that are not symmetrical, should I be concerned and is there a adjustment

I've done exactly this to my 2430A. I've replaced both of the dead Dallas NVRAM chips with Cirrus FM18W08 FRAMs in off-the-shelf SOIC to DIP converters (Aries LCQT-SOIC28), all bought from Farnell in

If they are marked ZM or ZS they are well known to get leaky. Replace these diodes with MUR160 600V 1Amp from Mouser/DK.

Hi, Reg. Regarding fast pulses and such, there is a wealth of information at Jim Andrews' page here: https://kh6htv.com/pspl-app-notes/ He founded Picosecond Pulse Labs in 1980 and sold it to

Picosecond pulse labs used to sell NLTL's for pulse sharpening amonst other applications. NLTLs are still commercially available. Bruce

Reg, There might be a more elegant solution possible. The problem of battery ram was discussed at length in the pinball forums, and people made other solutions for it. Permanent ones. No battery to

To prevent that ground ring short, always practice safe probing; use a probe condom.? One of those plastic SMA connector caps works well, or just tape in a pinch.Jim Ford?Sent from my Verizon,

Nick, I have a 2246A that I had to get the ripple on the various DC busses knocked down. Replacing the ZS diodes was done, most of the secondary DC busses caps, a number of those were bad, I could not

I have one of Leo's 100 pS impulse units as a source for initial experiments. If I can narrow that to 10 -20 pS with discrete SMD parts I may be able to get the idea to work. There's a close

Nick, That is the way some of these threads go. You don't need a variac at this stage. A while ago you mentioned you had an isolation transformer, as I recommended and you asked whether to connect the