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OK thanks. As you can see, you can measure both resonance and Q at the same time with the shunt resonator method. The null frequency gives the resonant frequency and the depth of the notch can be used

Yves, I double checked and filled the table like you did *Log* *Lin* *VLOG2* -7.990 10,092 *VLOG3* -8,015 10,089 *VLOG1* -8,07 10,087 *-8VT* -8,236 -8,236 *VLIN* 3,672 -6,624 *VLOG/VLIN* 3,695 -8,005

If we think about the nice logic cables that come with the HP MSOs, ie a flat, presumable shielded cable, a box and then thin, flexible, presumable shielded cables that go to the probes. I would love

I've watched a few of his videos, and his troubleshooting methods are irritatingly slow. He reminds me of newly graduated tech school students that shotgun ded equipment rather than develop the skills

Marco, For my 8595E, module A12, after power on, if CORR=ON, IFA1-A4 are OFF and IFA5 is ON. From this point on, only when the REF LEVEL is at 0, +10, +20, +30, +40, +50 and +60dBm, IFA5 is ON, all

Adrian's Digital Basement But...AFAIR... he's a software 'engineer' whose hobby (fixing old 8 bit computers), turned into a full time YouTube channel. Well... okay. But. There are much better people

jmr, leaving Q aside for now I'm going to try your shunt arrangement out. It just seems like this should work better than the way I'd been attempting it; much more logical. Many thanks for that idea!

FWIW: Here in Colorado Springs (dry climate, high altitude) I seem to have MUCH fewer cap failures than everyone else. I can't remember the last time I found a tantalum that was actually bad (and

Marco, This is my measures about LOG/LIN switch The LM339 U108 has open collector outputs, as the graph shows, although it is not to scale with the configuration in your 8591E, but you can see that if

Here's what happens if an attempt is made to measure the Q via a reflection method (s11) using a modern lab VNA. This is asking a bit much of the VNA as the reflection coefficient is very close to 1

See below for an image of a couple of my old Q measuring jigs. I haven't used these for a long time. The larger one mounted on pillars has a resistively tapped (low impedance) source and it has an

Hi Ed thanks. In addition to what I described already I do have various Q measuring jigs here including one with a Hi Z amplifier as you describe. It's a bit of a mess but it does work quite well. I

jmr, you can do the Q more directly with your VNA if you can add a high-Z RF amplifier, and likewise, some Z reduction at the source. The trick with Q-meters is to get ideally zero output Z in the

The next test method I tried is the classic shunt resonator method. This relies on the VNA ports being exactly 50 ohms so I pad the ends of the cables with 15dB and 10dB attenuators to really make

Oops - I lisdexified it. It's HP4342A not 4243A.?? Ed

Next thing I've done is to measure the Q using the 3dB bandwidth method. I can do this using various test jigs but in this case I tried doing it with the resonator up in free space and I coupled to it

Here's yet another approach. One of my projects from some years back was to build a Q-meter front end - power amplifier, impedance converter transformer, high-Z RF amplifier, variable capacitor, and

Hey Gordon and Yves, Thanks for the advice! I had a look there before but I was wondering if it really is different from the CLIP that's freely available on the keysight website. Because the artek

I managed to get some 0.4mm diameter wire and the datasheet suggests that the enamel adds about 0.06mm to the diameter. To get close to a 31mm former I had to wrap some masking tape around an existing

Yeah, it's not trying to solve Unified Field Theory, but just looking at some common engineering problems from different perspectives and methods. It's good to know of various approaches and