¿ªÔÆÌåÓý

Date
Re: VNA Resonance Methodology
Oops - I lisdexified it. It's HP4342A not 4243A.?? Ed
By ed breya · #148771 ·
Re: VNA Resonance Methodology
Next thing I've done is to measure the Q using the 3dB bandwidth method. I can do this using various test jigs but in this case I tried doing it with the resonator up in free space and I coupled to it
By jmr · #148770 ·
Re: VNA Resonance Methodology
Here's yet another approach. One of my projects from some years back was to build a Q-meter front end - power amplifier, impedance converter transformer, high-Z RF amplifier, variable capacitor, and
By ed breya · #148769 ·
Re: Troubleshooting a 8591e with opt 130
Hey Gordon and Yves, Thanks for the advice! I had a look there before but I was wondering if it really is different from the CLIP that's freely available on the keysight website. Because the artek
By Marco · #148768 ·
Re: VNA Resonance Methodology
I managed to get some 0.4mm diameter wire and the datasheet suggests that the enamel adds about 0.06mm to the diameter. To get close to a 31mm former I had to wrap some masking tape around an existing
By jmr · #148767 ·
Re: VNA Resonance Methodology
Yeah, it's not trying to solve Unified Field Theory, but just looking at some common engineering problems from different perspectives and methods. It's good to know of various approaches and
By ed breya · #148766 ·
Re: Troubleshooting a 8591e with opt 130
Hi Marco If you go to Artek manuals ArtekManuals | Your one stop shop for out of print test equipment manuals ( https://artekmanuals.com/ ) You will find a clip for HP8591E it comes with several other
By Gordon Slessor · #148765 ·
Re: VNA Resonance Methodology
I agree a bit with this idea but in this group we surf all time between the old an new measurement methods and equipment. In this sense the analysis of different measurements techniques and the way to
By Patricio A. Greco · #148764 ·
Re: VNA Resonance Methodology
Not really. A modern VNA is a very versatile tool. The original question was about using a VNA to test the resonator for resonance so I've tried to show how a VNA can be used in a way that will easily
By jmr · #148763 ·
Re: HP 8341B 1992 firmware version
Hi Saevar, Dmitrij, Thank you very much. In that case I will order 4 eproms and I will try to do the upgrade. I hope it will work. Thank you very much once again. Regards, Wojciech
By wojciechoo@... · #148762 ·
Re: Troubleshooting a 8591e with opt 130
Yves, I did some more digging and found the 8590B clip in the group files:
By Marco · #148761 ·
Re: HP 8341B 1992 firmware version
He just make error when write firmware to EPROMs.
By §¥§Þ§Ú§ä§â§Ú§Û §À§â§î§Ö§Ó · #148760 ·
Re: VNA Resonance Methodology
Entire topic is a bit odd These instrumenbts are "different animals" VNA is used in a constant Zo environment eg with filters, amps, mixers, dir couplers all at 50 or 72/75 Ohm. See HP notes on VNA.
By Froggie the Gremlin · #148759 ·
Re: VNA Resonance Methodology
To try and show why I think the VNA will work really well with the series resonant method (to measure Rs at resonance) see below for an old test plot I made across 1 MHz to 30 MHz where I measured Rp
By jmr · #148758 ·
Re: VNA Resonance Methodology
I've used a few Q meters and they are very convenient to use. Also, in this case, the Rp is only going to be about 75,000 ohms at 1.45 MHz so a decent Q meter should give reliable and repeatable
By jmr · #148757 ·
Re: HP 8341B 1992 firmware version
Wojciech, I can't say for sure why he was having problems, there seems to be an offset in placement of the data in the EPROM he made and the firmware files downloaded so I would guess the problems is
By saevar · #148756 ·
Re: Troubleshooting a 8591e with opt 130
Yves, I checked the output of the 74HC374 and compared it to the IFA1 output which is on the same IC. Input signals are present, IFA1 output switches (B8_OUT) but IFA5 output (B12_OUT) never moves.
By Marco · #148755 ·
Re: VNA Resonance Methodology
The reflection coefficient will be close to 1 , but if you need to measure resonance you must to pay attention to phase. For this reason I said that the reactive part of Z goes to zero in resonance.
By Patricio A. Greco · #148754 ·
Re: VNA Resonance Methodology
It's definitely going to be risky to try and measure the Q of the 49 turn solenoid with an s11 measurement using a VNA because my software program lists the magnitude of the reflection coefficient as
By jmr · #148753 ·
Re: Tantalum Capacitors
Microdyne was strted by an engineer and a salesmmaman from Defense Eletronics, becuase they weren't interested in solid state designs. One of the owners ws still on the board when I worked there.
By Michael A. Terrell · #148752 ·