Interesting solution Keith. Thanks for sharing it. My dummy load is a pretty low tech solution in comparison, but I'm not doing precision measurements for the most part, and i wanted to build it mysel

Thanks for all the help, Ed. I have a large collection of precision resistors and a Keithley 196, so I'll spend some time finding 'close enough' sets for the dividers and skip the trimmers. Rich

Actually, maybe i can use a 4.7k fixed resistor for the upper side of the voltage divider and use a 500 ohm trimmer for the lower side . . . that makes more sense.

Thanks Ed. That's what I'll do. I plan to have a switch in the circuit to select between 1X for low power amps and 10X for higher power amps. I will probably use 1/2 watt trimmers I have on hand for t

Thanks for bringing me back to reality. I suspected that accounting for the capacitance of the coax and installing a capacitor across the 9M resistor would probably be necessary, but I thought i might

Maybe an obvious question, but I want to run coax directly from my 8 ohm dummy loads to my scope for amplifier testing (audio frequencies) and I was initially going to make a pair of voltage dividers,

Mine behaves similarly. I get dancing readings or 'overflow' with leads connected (open) or detached in the 300 mV and 3V ranges. Shorting the leads zeros it out. Mine was calibrated last fall, so I t

I haven't needed one yet, but when I do, i planned to use a $25 JAMA harness with full 56 pin connection. Just need to cut the appropriate slots in the male connector . . . Dan's extender definitely l

I've been very happy with my DE-5000 LCR meter.

I agree. I found it odd as well. I have a TDS210 on the shelf. I'll have to dig it out and see how that performs in comparison. Rich

My scope has Option 14 which includes the display output. I did have to construct a converter to 'translate' the Tek pinout to a VGA input but running with that disconnected doesn't affect the latency

Any thoughts? Normal?

I've noticed that that the trace on my TDS380 works great and responds immediately to incoming signal changes but when I turn any of the measurements on, it appears jerky. Any ideas about why that wou

Dave beat me to it. . . . I'll be ordering the one he linked when I pull my DC501 for repairs.

Thanks for the quick feedback. P510 it is. Not sure what i'll do with it, but that applies to most of the test gear I have. I'll add it to my growing 'collection' of Tek stuff. Rich

I found this probe in the drawer of a Tek Type 500/53 scope cart. It doesn't have a part number or brand on it. Any ideas? Photos here: https://groups.io/g/TekScopes/album?id=271763

Quick update to close the loop. I went through the components related to the NE555 timer and concluded that it was, indeed, a dead IC. I injected a 20.48 kHz signal at the output of the NE555 and the

I use an IET DE-5000 LCR meter. Mine has both tweezers and Kelvin clips (i installed these to replace the alligator clips that came with it). It will test ESR at 100kHz and capcitance at 100/120/1k Hz

Great feedback Harvey. I should have thought to inject the timer signal . . . I'll give that a try. Jared - i found your video a few days ago. Thanks for taking the time to create/upload it.

Sorry for hijacking this discussion, but i'm working on a DM502 as well and wonder if you all could help. The unit powers on and has +5V and +/- 12V (step 1 of the check/adjustment procedure) but I do