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I think that would be problematic because of the inductance of the lamp. I can see that working at low frequency, but not at RF. I wondered about heating a wire, or probably a thin wide strip of

I have mentioned this before. I reckon if there are 400 pixels, that's probably enough to equal any analog meter. I have thought of driving an analog meter with a DAC, because the frequency response

No surprise, as the movement would normally be damped by the very low resistance of the thermocouple to which it should be connected. With the data you have, make a 0-1 Amp ammeter and test that with

Keeping the freq the same looks like an interesting interesting approach. Should reduce possible error sources. Need to get someone to move my 160A from the garage to the workbench. Hasn't been

It seems that I joined this list at just the right time. For several years I have been contemplating building a Q meter with no restriction on the type of technology used. I have a Boonton 260 which I

Since micro controllers are on topic here I can suggest that an analog meter face and moving pointer could be generated as a graphic on an L C D display. This would make it easy to implement the

I’ve been lurking here since August 4th but I can’t resist weighting in on this thread. There is a good reason why HP and others used the 1 3 10 sequence on their analog meters intended primarily

Here's a video I posted of the Multiply by Q meter from the 260A. https://www.youtube.com/watch?v=1IsH6S2TK7w I just found it interesting that it was so Undamped. Mikek

Oops I forgot to attach the meter movement

I found an auction on eBay today. It's for a meter movement out of a Boonton Q meter. There are some interesting things about this. * Q increases from left to right, but there is also a delta Q, which

Hi John, I believe measurement should be performed at same frequency. Attached is a SimSmith model example. Using Voltage Ratio method as shown in https://www.kn5l.net/Inductor-Plots/VNWA-Measure/

Hi David, There are several different BW measurement configurations. Measuring parallel resonant circuit in shunt configuration requires small coupling capacitors. As described in, previously

Hello all, I have a GR 1650 Universal Impedance Bridge. It works up to 20 KHz but with an external generator even somewhat higher up in frequency. In attachment you find' The general radio

The manual for the Advance Q Meter T2 gives a method to measure Q of a capacitor. "Approximations can be made by resonating a coil on the Q meter, and then noting the reduction in Q obtained when the

When you used the VNWA, did you connect the VNWA directory to the coil? Doing that will load the circuit - you need to couple via only a small amount. The use of 0.5 pF capacitors was mentioned in one

I think you replied to the wrong thread. This one is about Q-meters, but another thread is about low noise amplifiers.

Maybe some audio test gear. Ultra low noise. Active cooling. I have an ESI that matches resistors to 8 1/2 digits. Differential rejection. I have Tek, AP audio tools. Also Heathkit, some others too.

Hello Jerry, I own a?R & S type UVN meter as shown earlier, and as you mentioned it increases its?sensitivity when rotated?in the?clockwise direction.?One switches?the instrument on by turning

Hello Magnus, A usability, not technical question. The HP meter control begins at a low-range setting and increases as the knob is rotated in a clockwise direction. This seems rather 'natural' to me;

Thank you very much, I guess I'm just running a little slow. Mikek