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Has anyone any thoughts about how one make an LCR meter that works at low frequencies (below 20 Hz)? I need to measure the complex impedance of a capacitor of a few hundred pF. This presents a pretty

My original intention was to make an exciter for the TF1245A that would not require any modifications to it. I had some success in the 10 MHz to 30 MHz range by modifying the design of a ham radio

Is That true? Nothing like the Q meter thread days! :-)

You could wind a 10:1 RF transformer on a toroid as long as it covers your desired frequency. WE used a fixed 3dB pad to provide some isolation from RF souces Amidon was always my source for toroids.

Hi Micheal. I remember you from the SED days. I don't go there much anymore, my mail program will no longer take me there and I don't like the Google access. The amp I'm discussing is an RF amp not an

The automated test for this on the PRC77 Manpack radio used a low impedance audio output signal source. It then used a set of relays to drop the signal to 50% at the input. The computer added the

I looked online and reviewed the schematic for the 651B and its 50 ohm output on all attenuator steps, but the highest step comes straight from the output amplifier, which could be a little off from

I don't see how I have any problem with the my signal generator, it is an HP 651B. It's output is a very 'low output impedance amplifier' with a 50Ω resistor in series. It has internal attenuators to

I agree with Dave - you need to be sure of the source resistance. If the RF source is a fairly high level, then divided down quite a bit to your 8 mV with say a wide-band resistive step attenuator,

Let me just start with, I have something wrong. I think it is in the algebraic manipulation to Solve for R1. But, I don't know. The 8mV is open circuit voltage of the signal generator. Yes, if you

Also, it appears that your equation is wrong, it should be R2 times Vout divided by Vin minus Vout.? ?(R2 * Vout)/(Vin - Vout)

What is your 8 mV voltage source? RF signal generators with a 50 ohm output port have a 50 ohm internal source resistance and if there is a calibrated output level, that output is with a 50 ohm

I may be a little wordy, but I want the concept to reach the measurement. I want to measure the input impedance of a Norton Noiseless Feedback amp. It has been proposed that the input impedance of the

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Reg, I would like to experiment with these digital calipers. Where did you buy them? 73 Mike N2MS

It doesn't lose its zero when it shuts off. Zero it, open it and turn it off. As soon as you move it, it will turn back on and you will see that it still retains the zero. I use a 4" HF SS caliper

Has anyone had issues with the 'auto off' feature of these digital calipers? I can see working on a particular project, stepping away for a few minutes (coffee?), and coming back to a powered off

That's a pretty clever solution as a normal microscope XY stage is *very* poorly suited for such a task The zero and mm/inch features are very useful. I'd much rather use metric than inches. For

As someone who gets motion sickness easily, I feel your pain. Back to the topic of a cheap DRO: A friend of mine used cheap HF stainless digital calipers to set up someone's microscope XY table. They

I have used the commercial version of the device you described.? I found that the drill bit popping up in my vision caused me to actually get nauseous and dizzy so, no more using it.