Science also has to be fun sometimes, and so we tried to determine the influence of shockwaves on steaks. The shockwaves were created by high explosives in a water tank. Measurements of pre- and post-blast impedances were done on a Bode100 low frequency network analyzer. The results were promising – watch yourself:
Click here for Measuring the Impedance of Blasted Steaks …
After testing a Keysight E5061B-3L5 and an Omicron Bode100 VNA, I got another LF frequency response analyzer (not a full VNA) on loan, the AP Instruments AP300. This unit has a low frequency limit of 10mHz, way lower than the other instruments. It looks like this:
I use these units to determine the output impedance of linear, low noise power supplies.
Click here for a Power Supply Impedance Measurements Using an AP300 Frequency Response Analyzer …
Having an FSUP Phase Noise Analyzer on loan for an oscillator project (thanks N1UL !) I had the chance to check the phase noise of some commercial and homebrew oscillators and signal sources.
This a an EFRATOM LPRO101 Rubidium Standard. I also measured a commercial MillRen OCXO, a GPS standard, a Keysight N5171B RF signal generator and a RIGOL DG1062Z.
Click here to see some Phase Noise Measurements of Commercial and Homemade Oscillators …
Normally, crystal oscillators are standard components, used thousands of times without too much engineering attention necessary. If it comes to high quality crystals, a lot of unexpected effects can occur, like generating several nonharmonic frequencies at the same time and even chaotic behaviour.
here in the time domain:
Click here to see some Unusual Behaviour of Crystal Oscillators …
As an owner of some Keysight equipment I wanted to use some probes intended for the Oscilloscope AutoProbe connector on other test equipment like VNAs or spectrum analyzers. I asked how to do this at the Keysight forums, but nobody had an answer for me there except that it does not work.
OK, lets homebrew something and see how far we get.
To make a long story short, it worked after a while of research and testing.
Click here to See Using the Keysight AutoProbe Interface in Your Own Projects …
Having a Bode100 on a test loan I tried to make a full test run on all injection transformers I had at hand.
it worked quite well, the details can be seen here:
Click here to See Measuring Commercial and Homebrew Injection Transformers ..
I recently bought some dummy loads from eBay with a “monitor” output. As I found out this monitor was just a wire loop floating in open space coupling some undefined output to a BNC connector. I did not like this, so I converted this into a 40dB power attenuator.
It worked fine, details here:
Click here to see a Dummy Load Converted to a Power Attenuator …