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Hi Tom, At 4GHz, using my E4406 to measure its output from -90dBm to +13dBm, it appears to be within 0.5dBm of indicated. Above 13dBm the power doesn't increase and the UNLEVELED indicator comes on at

I see that the output of U3 is at -7.4V and the input is at -6.4V, so off from the specified value by 0.1 at each end.? The gate voltages of Q15 are finally balanced, which they weren't before, but

Just to be certain things don't get crossed up, the 85046A is a 50 ohm, 300 kHz to 3 GHz test set, and uses APC 7 connectors to interface with the DUT.? The 85047A is similar, but goes up to 6 GHz.

That is similar to what I see at NPL. Keysight and an aftermarket Swiss? company make a surface probe that can The coaxial probes can be made oneself, but I personally find the mathematics too hard to

[email protected] wrote: To my knowledge all *50 ohm* 3 GHz test sets (85046B) have APC7 connectors, not N connectors. If the test set has N connectors then it is almost certainly an 85046A which is

Thanks. I've got a lead on an 8753B with a 50 ohm 3 GHz S parameter test set at a comfortable price. Gedas gave me a very succinct explanation of why an eternal test set is preferable from a hobbyist

Hi Tim, How accurate is the power output at 4GHz? Tom Bryan N3AJA

thanks Dave, I sent it on to Ron. Did you see his website? It turns out to be his old one and his new one is down which he did not know so he got after his IT guy. I will send an update when back up

Connecting to the material is a problem, especially above 1000 deg C. Metals may react with fumes and change or melt. Many insulators and dielectrics certainly will. We are watching these exchanges

Thanks John, we appreciate any information we can get. Even the old stuff which has a lot of information. PeterB

Hi Colby, I can still change things via GPIB, no problem so far, my simple Labview(Student Edition) program still works :) regards Tim de VK2XAX

Are you able to select those frequencies via GPIB? I am trying to decipher my 'work' notes to determine exactly why I determined the Model needed to be changed..... but... those software options are

Hi Colby, Frequency changes works nicely :) I haven't worked out the math for the host id either regards Tim

If you're measuring about 2 mA test current in the 1 K range, it's about twice what it should be, so focus on the opamp U3 circuit. The key is to have the 1 volt drop on the reference resistor string,

I am definitely going to try this, again, myself. I swear that when I only changed the upper limit, I wasn't able to dial to the new upper limit until I changed the model. I hope I am mistaken.

For sale - HP 8656B signal generator, 100 KHz to 990 MHz, with HPIB interface and Option 001 High Stability.? * Recent calibration up to 3-18-2017, kept indoors, non-smoking. * Operates well, very

Attached is a booklet from NPL on dielectric measurements. Is is noteworthy they advise against the term "dielectric constant" as no dielectric has constant properties. Dave. > Dielectrics GPG - 2003

Joel, your thoughts are always illuminating! 1K range, loaded by my Fluke 8600A in mA mode - 2.08 mA R55+R56 = 2.1V U3-3 to U2-6 = 2.06V Completely consistent, though the wrong values. ;-)? I checked

[email protected]> wrote: In case you are not aware, VNAs are good around 50 ohms, but the uncertainy in reflection rises quite a bit if the reflection coefficient is high, or obviously in

Thanks! That's where it is. I *really* do need to read the manual. I just hate reading long texts on a computer. Dimension is relevant to resolution, but conservation of energy still applies which