The TDS744 no letter had a very short life, so short it didn't even show up in any catalog. The TDS700 family appeared first in the 1995 catalog as TDS744A and TDS784A. The main (only?) difference

Hi John, This being a transceiver model with VFD display, did you check that the filament, grid and anode voltages are correct? I would think that there might be a high probability that the DC-DC

Hi All, The remaining collets I got from Tom Jobe have all found good homes. -Chuck Harris Chuck Harris wrote:

Greetings All, I have an IC 720A that I am restoring, it is now operating TX and RX and I have also done the modification to the LPF to get rid of the "clacking" rotary relay, and now have silent

Hi Mel Nice to hear from someone else in the UK , most sites like this are dominated by guys in the US .Unfortunately I discovered that when I tried what others had done to the later versions . I

QService have a scan David

Hi Brian, I've just found this thread because I might need help on my TDS 744 (non-A). Unfortunately, the 1GHz upgrade doesn't seem to be possible on the first versions (non-A) of this scope. I

Not trivial, but quite doable.... The real problem is not so much the software, that can be written easily enough depending on your skill level, it's the 488 bus controller itself.  The TMS9914 and

The 561 / 564 family are very respectable 10 MHz mainframes, the first with two plug-in slots, I believe, one for the vertical and one for the horizontal. They differ only in the power supply design

Thanks Harvey!  That shows clearly that building one or two of these isn't a trivial matter. Having said that, it would seem that economics of scale ought to chop a bunch off the costs.  If it costs

Actually, it's a bit more than that.  You have at least several subsections.  Firstly, you have I/O drivers, getting the right ones is important for driving more loads.  Next, you have the 488 chip

FWIW There is an entire EEVblog thread on the AR488 FW which is based on an Arduino Uno, but expanding to support the Mega 256, STM32F103, and others. Now that the author has completed a major update

If you get to test the 561B, do it.  If filter caps are bad inside a 'bent trace' may appear, horse trade a little and repair it.If a buyer was sneaky, twist the horizontal trace position so it goes

AFAIR it's TTL (a current sinking logic technology) levels... fairly high current (20 mA), open collector driver chips, for instruments to pull down the bus, in parallel... driver chips of a type not

There is a whole thread where people are comparing fake Agilent GPIBs against real ones. E.g. the fake one does not have internal EMI metallisation of the

In the scientific equipment world HP/Agilent equipment that had HP/Agilent PC software you had to use a HP/Agilent GPIB card. The software was dependant on code residing in the adapter. If you used a

Don posted before me (I should have read the second page!)… but, yes, as he says... that is what happened with Windows... and why Microsoft moved to try to make OEMs (and succeeded with most, like

Unless there is something in the hardware that the drivers can query (like in N.I. products)… I reckon that there is no obvious way to determine the "authenticity" of the drivers on the disc... and

AFAIK, the HP/Agilent USB (if that's what you are referring to)… they were never made in the U.S.... or at least not very many. They were always mostly manufactured elsewhere... China being one

I have seen... over the years, even in the limited market for GPIB... several low priced IEEE 488, 8 bit, and 16 bit cards.. but they never really seemed to take hold. My guesses for the reasons for