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Test Equipment Anonymous (TEA) group therapy thread

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Specmaster:

--- Quote from: bd139 on May 31, 2018, 09:58:41 am ---Yeah that construction is much better than Tek, which usually starts with "so how the hell do I get at that without having to remove the interface board" and head scratching for half an hour.

Have to be very careful with the latching changeover switches however as they get very brittle with age. I actually broke the end off the mains switch one in the 3478A when I was cleaning it and replacing the filter caps. Just literally nudged it slightly and it fell to bits. Drilled a hole through the middle of both halves with the Dremel and added a metal pin and some epoxy. Has been fine since  :phew:

--- End quote ---
I'm dead chuffed with the 3478A, we did well with those at the time  :-+

bd139:
Yep that and the TF930 are this year's star buys so far :-+

Specmaster:
I'm sure there will be others soon  :-+

med6753:
When we were discussing scope calibrators last week I wanted to include some sample wave forms   but I didn't get a chance. So here's some now. It's the “Time” output of the Heath IG-4244. Scope is a Tek 2465 DMS with 300MHz bandwidth. Channel 1 50 ohm input. Per the Heath manual ringing of the wave form on the trailing edge is normal. But there should not be ringing on the leading edge.

Pix 1 – 10MHz

Pix 2 – 20MHz

Pix 3 – 50MHz

Pix 4 – 100MHz

As you can see via the frequency readout display it's pretty much spot on. It does drift a little as it warms up but that's to be expected. 

BravoV:
2.5GHz thingie, not my fault, blame Berni.  :palm:

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