Thanks for mentioning the thread.. it just confirms my suspicions that there is a possible hazard and I already had one of these things (not Schaffner branded, but still) stink up my apartment, so I'm

Thank you for accepting me into this group. I'm a retired electronics design engineer; that is, "retired" to the extent I no longer go to a job. I do however stay very active with my own small

I just happened to notice this cross over between groups. There's a conversation going on in the HP/Agilent/Keysight group regarding RIFA caps, and the question Schaffner filters is broached there as

OK current update is that VR45 and Q45 are in good shape even if VR45 could be a shade higher (only 6.05V versus 6.2V @ 10mA). This was verified on a 577 CT in both swept and DC modes and also with

Nigel, In my previous message I mixed up "crowbar" and "current foldback". I intended to say that there is no current foldback, so the current stays at the maximum value when a short occurs. Albert

Albert thanks for your inputs but I would beg to differ, there is for sure a crowbar and it's comprised of Q45, an SCR clearly designed to clamp the 5V directly to ground, and it's triggering device

Hi, I've had good luck with the probes I received (1x P6109 and 2x P6122). They're in used but not abused condition and seem to work with no issues. Unfortunately, the probe leads of the P6122 have

Point taken, and previously considered. Yes, those sockets are exposed to live mains voltage, WHEN and ONLY WHEN the Leftmost switch is ON. Those are my choice, and I am well aware of the dangers,

Issac, Good, then you are ahead of me on this. The HV Transformers on the 465 are also known to fail. Interested to learn what you finally find as the problem. -- Michael Lynch Dardanelle, AR

Yes i desoldered it, In-fact i expected originally it to be faulty having seen the HVM in my 475 fail, so i jumped the gun and outright removed it from the scope before testing to see if the -2kv

Nigel, Current is limited to a maximum by conduction of VR55 but there is no crowbar function. VR45 fires in case of overvoltage. I would put a voltmeter on +5 V and an ammeter in series with F65 (or

I don't think there is any additional hardware required for 2C, but for 3C and 4C, optic fiber to BNC optical probes are required for each option, they cover different light frequency ranges. The

Those options are not for 744A or any other A-scope. http://www.hakanh.com/dl/docs/kitinstructions/tdsupgr.pdf /Håkan

The TDS (and DPO) 7000 series seem to be very few and far between on the open market, I think it may be a case of taking what's avaialble rather than being able to pic and choose.

At the very least some kind of shrouded plug/socket arrangement. Something like the fluke DMM leads mean you cant get your fingers in there.

Does anyone know what hardware is required for the TDS744a Options: 2C (comm analyzer) , 3C (Optical short Lambda) & 4C (Optical, long Lambda) ? & where to get this hardware ? thank

I had an occasional image "shear" or jitter on my TDS784D. Recapping didn't fix it, and eventually I discovered that the problem was simply that the connector to the horizontal deflection yoke had a

Hi Jared, I've watched your video on YouTube, it is interesting you have re-designed probably a variant of the DS1486 and DS1250Y replicas. As you might probably know, there is an american person

Are those banana jacks exposing bare metal that is at mains voltage?...... I really think you should rethink that design...

Hi to All, Rather straightforward question. Anybody? Early TDS7000 Series NVRAM's have sometimes a too high current drain. Later ones (like the B-Series) use the DS1245Y-120 Devices. These seem more