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8116A Code 42

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MarkL:
Glad you figured it out.

The terminator could have been marginal or constructed with a cheap resistor.  At its maximum, the 8116A can output +/-8Vpp square wave which would be 2W 1.28W into 50 ohms.  A good 2W terminator should be able to handle this.

I'd recommend keeping around a few brand name terminators for calibration tasks, like from Minicircuits or Tektronix.  The feedthrough terminators are even better for high frequency work since there's not a stub, e.g. Tektronix 011-0049-01.

Sorry, no idea on obtaining tri-coax cable.  I would give it your best shot to salvage the existing cable by stripping back past the bad section(s).  Failing that, you could try to replace it by bundling three individual coaxes, but you would need to determine the impedance of the old cable to select the right replacement.  This can be done with an LCR meter or TDR.

EDIT: fix 1.28W

Mick B:
Hi Mark, after some investigating, I think that the terminator was 1 watt. I ended up getting 2watt attenuators for calibrating this and I had a 2watt passthrough. Bottom line I just didn't think about the wattage of the stubby one. I won't do that again.  :palm:
The Tektronix 011-0049-01. are very expensive I found some used ones on Ebay $49.00 but he's on vacation and has 10 I think, I can get a few of these.
I kept cutting back a few inches and still have an open, now the cable is short. And I will still have to overcome (see picture # 3 crimped on). The braids were screwed, crimped, and peened it took me about 45min to get the braids out of these holding devices. :scared: 
Nobody has tri-coax cable everyone's impedance is either 50 or 75 ohms I haven't measured HP's yet but hopefully its 50ohm, if it is I am leaning towards one of these
I have 50ft of the RG-316 and then there's Pasternack's LMR-100A-UF. either way I will have to come up with a sheath of some kind or someway to keep the 3 somewhat together. OR PUTTING IT IN THE CLOSET UNTEL A PART SHOWS UP!

Mick B:
Hay all, this is a P.S. to the above post speaking about Attenuators, I should have added that (quit using attenuators to adjust this HP 8116A after your (MarkL) explanation as to why HP were using them in the first place) This can be found in an earlier post in this thread. What a time saver.

MarkL:

--- Quote from: Mick B on July 22, 2024, 06:06:14 pm ---...
The Tektronix 011-0049-01. are very expensive I found some used ones on Ebay $49.00 but he's on vacation and has 10 I think, I can get a few of these.

--- End quote ---
That's a pretty high price.  There's a couple of sellers in the $25 to $30 range. As long as it's ebay category "Used", you can return it if damaged.

Also, I discovered that the 5005A data pod,  #05005-60006, is the same one that's used in the 5006A.  It may help broaden your search to look for a dead 5006A, but it's probably just as scarce.  The pod itself has been superseded (later rev) by #05005-60102, according to Keysight Find-A-Part, so that could work too.

Mick B:
Hay Mark, thanks for the info, in the meantime I'm going to make one until one comes up. I just got two 011-0049-01 for $39.00 2 for $50.00.
I'm now looking for some better-quality Tee's/splitters, the ones I have the male connector are crimped and are starting to fail at the crimp. Do you have a Brand to recommend for this part?

Alos I am going to start on the other HP 8116A without option 001, it has the same problem high overshoot at 16V@100kHz square wave. I'm going to look at the recommendations you gave me for the other one with this problem.
 I have been wondering how this unit produces a clean square wave.
 and was thinking about the circuit were the caps 528 and 530 are. The manual says they effect the overshoot. Pg.10.4-5. (see picture) can you explain this circuit?
 I don't have any very small PF caps but I'm going to get some, the problem is they are 1pf 200V is this voltage necessary? is there a spike potential? I can get 50V all day long. I will have to confirm this, but I think I saw this overshoot on the trigger output also TP4 looks good
Well that's another project.   Thanks.

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