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Hello George, As the bible is full of contradictions, what is so valuable about Grover? 73 de Brian, VK2GCE Sent: Friday, 16 September 2022 10:52 AM To: [email protected]

Indeed it is. I have various rules of thumb that were derived from Grover, and in this case my thumb gave me a number that was 50% higher than given by the online calculator, so that piqued my

The bible for inductance calculations is: Inductance Calculations by FREDERICK-W-GROVER Cheers, George G VK2KGG Sent: Friday, 16 September 2022 9:03 AM To: [email protected]

I don't know, at 150MHz, every nH is 1Ω in series with the winding of the drive transformer. 1" of 30 gauge wire is 15.2nH If we go by the T68-2 50T Injection Transformer that Guido ON7CH presented,

Why will the nichrome wire inductance be an issue? The measurement is the ratio of the voltage measured by the VTVM at the inductor-capacitor junction and the voltage drop across the precision

Thanks, Mikek! --Cheers, Tom -- Prof. Thomas H. Lee Allen Ctr., Rm. 205 350 Jane Stanford Way Stanford University Stanford, CA 94305-4070 http://www-smirc.stanford.edu

https://chemandy.com/calculators/flat-wire-inductor-calculator.htm Mikek

That brings up the question, "What is the inductance of the precision resistor and the nichrome wire? My thinking is they had to have a lot of heat to develop the current required to drive the meter.

I'm curious where you found that calculator. I would've guessed something a bit over 10nH for the plate, based on scaling the value for the wire. Not a huge difference, but I'm curious to see what

Found a calculator, 1" wire 21.1nH, 1" square plate 7.1nH.

As far as the correct thermocouple, I have found nothing in Boonton (HP) notes to indicate what the type was. Given that the wire reaches 1600° F nominal, I suspect if a standard thermocouple "Type"

For those wanting to see the inside of the 260A 'resistance wire/thermocouple' assembly, this webpage has a repair of one. https://www.prc68.com/I/Qmeters.html#Thermocouple_Repair Click on

The vertical amplifier specs for the Tek 1480 waveform monitor were, frequency response; 50KHz – 5MHz ± 0.5% (or ± 0.043dB), and for amplitude on the 1V range; ± 3mV (or ± 0.026dB). From:

To be very specific, an F767 Nucleo board with an S1D13517 graphics chip (mapped as 2 locations, 16 bits of memory mapped data, but static RAM, so the timing could be controlled). What didn't work, a

That's fair. For me, I have not had an issue so far. The gadgets I tend to build do not include any truly high-speed buses, where a couple inches of wire would be a problem. I did build a

Also one place that Tek over speced their bandwidth that drive other vendors crazy was in the probes. A 100Mhz Tek probe can be used to 100Mhz with no roll off this is not true of all probes as a

The +/- 1 dB was back in the Tek 453 scope days. Paul, W8AEF _____ From: [email protected] [mailto:[email protected]] On Behalf Of Gary Johnson

I've never heard of that, either. The manuals of that period all use the conventional 3dB figure. Now, if the statement had been "Tek spec'd in-band flatness to a 1dB error band" out to where it

I've never heard that. And I've measured the bandwidth of many a 'scope over the the last 40 years, always finding it to be -3 dB very close to the rated BW, and conforming to BW = .35/RT. -Gary NA6O

I need to add some drawbacks to the eval boards (I think, regardless of manufacturer, which also includes Arduino). If most of what you do is I2C, SPI, parallel and the like, the signals can be slow