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Re: A homemade diode power sensor for HP meters
Hi , it seems to me that q1 and q2 (FET) form an electronic key. then the capacitors must be there for the switch to work properly without switching aberrations. Already C7 and C8, possibly keep the
By joarez siczkoriz · #92646 ·
Re: A homemade diode power sensor for HP meters
You seem to have an extra diode, no terminator and reversed polarity. The terminator is probably the issue. The 11863A calibrator manuals may give some clues
By Robert G8RPI · #92645 ·
Re: A homemade diode power sensor for HP meters
Orin beat me to it but BAMA also have a copy (with some the change sheets) at: http://bama.edebris.com/manuals/hp/8484a/ I bought a box of a dozen dead 84xx sensors a while back for about 60 USD,
By Adrian Nicol · #92644 ·
Re: A homemade diode power sensor for HP meters
8484A diode sensor schematic is here... http://www.dudleylab.com/08484-90019-PowerSensor.pdf wrote:
By Orin Eman · #92643 ·
Re: A homemade diode power sensor for HP meters
Robert, do you own a schematic of the diode sensors? The schematic for the thermocouple sensors was hard enough to obtain. In the current service manuals, there are of course no schematics at all, and
By Tobias Pluess · #92642 ·
Re: A homemade diode power sensor for HP meters
Interesting project. The diagram you show is for the Thermocouple "A" suffix sensor. While the principle and basic circuit is the same for diode and thermocouple, the A2 PCB is different so there must
By Robert G8RPI · #92641 ·
Re: Yet another TG project
I have added a new picture, showing the low frequency end performance: /g/HP-Agilent-Keysight-equipment/photo/78668/1?p=Name,,,20,1,0,0 The upper trace A is the TG output near 0
By Ed Breya · #92640 ·
Re: A homemade diode power sensor for HP meters
@Peter thanks. Yes, exactly, the meters themselves are really cheap. I currently don't have access to some blown 8481A or similar sensors, so I cannibalized a sensor cable :-( because the connectors
By Tobias Pluess · #92639 ·
Re: A homemade diode power sensor for HP meters
Very cool, Tobias. You may want to study up on the interface between the 436 and sensor heads. There's typically a particular resistor in each head type for identification by the 436 - it then
By Ed Breya · #92638 ·
Re: A homemade diode power sensor for HP meters
This is an interesting project.? As you say the meters themselves are dirt cheap.? I have seen blown sensors sold cheap as well and maybe it's possible to build your circuit into one of those which
By Peter Gottlieb · #92637 ·
A homemade diode power sensor for HP meters
Hi guys, as you all know, the HP 435A, 436A, 437A and so on are quite nice power meters and the meter itself is availabe at quite low prices. However, the power sensors are quite expensive. I own a
By Tobias Pluess · #92636 ·
Re: Yet another TG project
Thanks Don, That is very interesting regarding the sweep digitizing process - I'll have to look into that. Regarding the LO shifting process, I was vaguely aware of it, seeing it mentioned years
By Ed Breya · #92635 ·
Re: Yet another TG project
Now I'll talk about the methods used for processing the LO signals. There are many ways to do it, but I used particular arrangements depending on what I had on hand in the junk parts department. My
By Ed Breya · #92634 ·
[test-equip-trader] Microwave adapters ( non-waveguide)
For those that do not know SMA, 3.5 and 2.92 are all physically compatible. SMA is good to 18GHz, 3.5… 34GHz, and 2.92 to 40GHz. 2.4 and 1.85 are physically compatible. 2.4 to 50GHz and
By Pete Manfre <pmanfre@...> · #92633 ·
Re: Yet another TG project
Ed, How versed are you in the freq. tuning scheme of the 8568? Are you aware that the scheme involved toggling frequency shifts between the 1st and 2nd L.O.’s every 20MHz of freq. sweep? This was
By Don Bitters · #92632 ·
Re: Yet another TG project
Ed, I just recalled a weird intermittent failure involving the 85662A A3A4 and A3A8 brds. The sweep ramp goes to both brds. if I recall correctly. The A3A8 digitizes the sweep ramp and when it hits
By Don Bitters · #92631 ·
Re: Synthesizer module in ESG series E4435B
Beautiful job!
By Peter Gottlieb · #92630 ·
Re: Synthesizer module in ESG series E4435B
well at the end I bought them, I offer 25 and I had 15 coupon so at the edn I spend 13 dollar in total! Thanks for the link! Il giorno ven 16 nov 2018 alle ore 22:49 Milan Vasic
By alberto.vaudagna · #92629 ·
Re: Synthesizer module in ESG series E4435B
Leo, Will be good when you have already open A24 module to write-down state of the pins 8, 9 and 10 of U313 in function of the frequency bands. Milan
By Milan Vasic · #92628 ·
Re: Synthesizer module in ESG series E4435B
I'd sign up for a replacement board or even just the gerbers so I could get my own made instead of using your time. In fact I'd probably just be happy with the schematic, parts list and instructions
By Tony Goodhew · #92627 ·