Chuck, The 11801 Service Reference Manual has a test (page 2-44) calling for the 11801 to measure its own calibrator at 35ps or better for the sampler/calibrator combination. No mention is made of any

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Lucas, From what I have been able to find, the 11801 has a 20ps rise time calibrator, but the 11801C has a 250ps rise time calibrator. I don't know about the A and B versions. --John Gord

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Per, It looks like you are using a very long delay (30us or so). Can you use a much shorter delay? You may just be seeing the actual jitter of the signal from one edge to another edge 30us later, or y

Stephen, Be aware that the pinout of the transistors may be different. Some re-wiring may be needed. --John Gord

Martin, From what I can see of the board, it may be an output buffer board: It may provide deflection-voltage-derived X and Y output to some external device, probably at fairly low bandwidth. --John G

Toby, It looks like there are several devices held in place with a common clamp bar. If that is the case, you need to match thickness fairly well, or perhaps use a thinner insulator like mica while ad

Toby, It looks like the part number is 342-0082-00, described as an insulator plate, 0.52" x 0.52" x 0.015", material: alumina (aluminum oxide). It is likely used with thermal compound added, --John G

Toby, If it is a hard, brittle ceramic-like slab, it is probably alumina (aluminum oxide). It is a good electrical insulator and a reasonably good thermal conductor. Beryllium oxide looks similar, but

How about: Drill Tap Insert long screw Pull? --John Gord

I forgot to mention: If interested, please contact me directly: johngord (at) verizon (dot) net --John johngord@...

Free for pickup: Tektronix C1001 BW CCD camera. I live in Venice, California. --John Gord

Bruce, I have a similar counter, but with LCD instead of LED display. The firmware automatically adjusts for the divide-by-64 prescaler and displays the actual input frequency. It also has provision t

James, What frequency range would you like to cover? Hameg made the model HM8028 which goes to 500 MHz and needs a (large) power supply frame and an external x-y display. It is fairly rare, having bee

Lawrence, Take a look at page 25 of the following document: https://www.davmar.org/TE/TekConcepts/TekProbeCircuits.pdf It discusses a probe with T-coil termination. --John Gord

In addition to good connection methods (very short grounds, etc.), a valuable technique for these measurements is to loop the probe cable a few times through a large ferrite core (split cores are easi

Ernesto, Be aware that many ceramic capacitors have much lower capacitance when DC bias is supplied. It might be a good idea to check them with a bridge which allows application of bias. --John Gord

Bill, Purists will protest, but here are some methods I use on my personal stuff. It depends a lot on what you are replacing, and how important the finished appearance is. In some cases, you can just

Simone, Pin 14 on the TL594 is VREF, listed on the data sheet as 5v. The two pins are tied together, so those pins are probably OK. <<http://w140.com/tekwiki/images/d/d6/Tek_222_Component_Level_Servic

Bob, I assume the connections you need to make are USB_DM and USB_DP. These go from the USB connector to U4, the main processor chip. Could you make the connections more easily at the pins of the proc

For those who don't mind some non-factory modifications: The 212 (and similar) Tek miniscopes use nickel-cadmium cells charged with a non-isolated line-based charger. (The isolation occurs in the DC-D