How about a small interval timer and a small doorbell-size solenoid sitting over the button you need to record/save the trace? It seems that all you need is a finger to push a button every so often, so make a finger.

Bob M.

No specific answer regarding the Anritsu, but some SAs have an external trigger input that you could attach a timer circuit to. One problem you'll likely have is that the spread-spectrum transmissions are brief and a moving target. Most SAs have a swept frequency for the horizontal axis, and this sw...

Perhaps it is Be/Cu alloy. Whatever it is, it's incredibly hard and refuses to be bent other than where it's bent now. It took a lot of effort to scratch it, and the residue was minimal. It could also be some sort of brass alloy. I agree that it should be replaced with plain copper, possibly two or ...

As for the original meter that changes with temperature, I gave that back with the caveat that the readings may not be consistent unless the meter is left running with the same 10A of current flowing through it for 10 minutes. Three other 20A meters were way out of calibration, which is probably why...

Shouldn't have happened. This meter is on a J-plug and is only used when fiddling with the ATU or making impedance measurements. It's out of the circuit and inside the xmtr/studio building hanging on the wall when not in use. I doubt the CE would have gone outside during a t-storm to measure base cu...

I tested some other (Weston) ammeters this morning. While three of them were about 50% off calibration, none exhibited the drift of the first meter I encountered. I adjusted the 15A meter's zero adjust screw so it tracked within 2% from 6 to 15A. I set things up for 10.0A and connected the meter, wh...

I would agree, a Delta CT makes more sense, but this is a meter that's swapped around into the J-plugs in the tuning houses of several towers, and Delta CTs are a lot more permanent, requiring one to disconnect the current-carrying conductor that passes through the CT to relocate it. They're great f...

I measured about 0.25V drop across the meter terminal studs with 12A flowing, so there's 3 watts to generate some heat. The metal straps are also losing some voltage but I can't be sure if the connection to them is good. They're very hard and the clips aren't making a good solid (scratch the surface...

All the connections seem to be tight. I had loosened and removed the nuts and washers and pulled the straps off the threaded meter studs but they sprung right back to where they were. This is the strangest metal I've ever encountered. It's almost like the spring inside a wind-up clock. Perhaps it's ...

Thanks for the 1 ohm resistance of the 1A meter. One thing I noticed is that my dynamic load shows only 4.5V across it at 12A flowing. I know the supply isn't drooping; it's good for 70A. The wires are all pretty thick. That 1/2 volt drop at 12A is 6 watts, which is plenty of energy to make things h...

I'm testing a Wenschel 15A internal thermocouple-type RF ammeter. It seems to be accurate enough, within 2%, however with 12A DC flowing through it, the back of the meter, the terminal studs, and the metal straps between the meter and J-plug are getting hot, and I don't think that's normal. This doe...

Some true on-line units are very picky about the incoming power quality, which to me makes no sense, as all the incoming power really has to do is charge the battery and provide DC for the always-running inverter. TrippLite in particular wouldn't run on a mechanically-governed generator at an AM sta...

Inner foil layers are a definite possibility. In the past I have actually and unfortunately pulled the plated-thru hole "tunnel" when removing some caps. If there are just top and bottom layers you can just solder both ends of the lead, but the solder just won't flow along the lead by itself if you ...

Once the iron softened it, it sucked out like solder. It just took a tiny dot of 60/40 solder at the tip of the iron to get the heat into the joint to get it to soften enough so I could wiggle the capacitor lead out about half its length, then I had to heat the other lead and wiggle that one, and ba...

Pricey stuff. I have heard of ChipQuik flux, which seems to be quite helpful for soldering SMT parts. I just do so little SMT work, and don't have a hot-air workstation, that I just learned to "make do" with ordinary soldering tools.

Bob M.