Hi Eric, As several people have pointed out already, the 1MHz bandwidth of the 7A22 Differential Amplifier is too low to require a T-cable matched to 0.1". However, it occurred to me that you may

Richard Steedman added the album Hack BSM plug: Photos of a plug which fits a BSM socket, made from a BNC plug and the poly insert and pin of a BNC socket. Shown in use displaying the pre-trigger

I did another test and moved J504 to the other position. The positive reference changed to +1.362V and the negative to --1.244V. Is this an indication that U2521 is bad? Thanks Roger

How are you probing this? Note that a 1X probe will load the outputs with 1MOhm, which is probably going to make them droop severely between refreshes. If you use a 10X probe, you'll load the outputs

Hello - I need 2 of the Option 13 RS232/Centronics interface boards/cables/ports for a TDS510a and TDS640a (they're the same part for both scopes). I am not looking to pay fleabay prices for them, as

You're triggering on CH1, the white trace. If swapping the split-cable plugs between CH1 and CH2 results in the same image, i.e. CH1 the same amount before CH2, it means: 1. The cable's signal lengths

Siggi, I don't think I am doing this right. I can see a complex waveform at the input of the MUXes with a peak to peak voltage around 2.52V However any of the outputs seems to vary with time and all

hello ed I wish I had a TDR !! I put some photos with a test (@ 800 mhz +0 dBm) just for fun the strange thing is that even if I invert the two bnc of the coupler the tracks do not move (always first

feels like roughly every other message is getting lost here? I'd go through the DAC's reference network first, if I were you. You can twiddle the pots on the scope until one of the peaks is way

I have to put my one-cent-worth in here. I'd vote for the simplest suggestion of using a BNC Tee with "identical" cables connected, out to the DUT. If you really want to build something "permanent" or

Thx. I didn't do any of the scans, everything is stuff I found here and there and then reworked in Photoshop. The CRT collections were in decent shape but the 7K-series plug-in and the primer of

Thanks Siggi for following this repair attempt. Would you please comment if the values I have reported are really low? Meanwhile I will follow your suggestion to probe the MUXes. They are as you

Don't sweat it, nobody's wasting any time, we do this because we enjoy it. When you mess up and have to backtrack, that's part of the learning experience too. He who never made a mistake never did a

Bill, Really nice scans. Thank you for sharing. George

yes colin ...... building it as tek is almost impossible ... very very precise ... however, you can have fun getting close to their

The 7L5 looks interesting, but the shipping to the UK is eye-watering. I realise that it isn't your decision, but $537-plus - ouch! Colin.

Sorry, I made an error in deleting some text. It should read: "a BNC tee-piece with three female connectors, plus two equal lengths of BNC male to BNC male coax could be used." Colin.

I have two of these (none for sale!). The tricky bit in "building" one would be in sourcing the "joint" which has a female BNC and the two identical coax wires going to the two male BNCs. Of course,

Yup, they're low. This is low by roughly the same ratio as your references above. Measure the voltage drops over all the resistors in the DACs network. If you find one has zero voltage drop,

thanks eric of the info I figured it had to be like this but when in doubt I asked the fantastic group I have attached link to a photo can it be built like