Re: 50 ohm thermocouples was RE: [HP-Agilent-Keysight-equipment] Issue with homemade diode power sensor for HP meters
Peter,
it seems to be possible. This is exactly what this guy has done:
(This type of sensor is also known as Bolometer,
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Tobias Pluess
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#92736
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Re: Issue with homemade diode power sensor for HP meters
What is the business case for thermocouple based power meters when you can get the same function with silicon at a lower price:
<https://www.analog.com/en/parametricsearch/10697>
One of the
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Mike N2MS
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#92735
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Re: 50 ohm thermocouples was RE: [HP-Agilent-Keysight-equipment] Issue with homemade diode power sensor for HP meters
Do you know the thermocouple type? And the resistor power rating?
I’m just wondering if it might be possible to solder a micro thermocouple to a extra small surface mount resistor.
Peter
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Peter Gottlieb
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#92734
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Re: 50 ohm thermocouples was RE: [HP-Agilent-Keysight-equipment] Issue with homemade diode power sensor for HP meters
Thermocouples with an embeded 50 ohm resistor..The 50 ohm resistor is the heater and thermocouple generates a voltage
proportional to the heat gnerated in the resistor
Dave
manuals@...
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Dave / NR1DX
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#92733
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Re: Readings from 436A power meter using 82357B USB-GPIB?
REN should not be deactivated to take a reading. 436 must stay in Remote. I have sent you a 436A Operating and Service Manual. Read Section 3.
Bill Lauchlan
Sent: Tuesday, November 20, 2018
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bill.lauchlan171@...
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#92732
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Re: E4440A won't switch on
Hi Gavin
I doubt that it is a dislodged connector, this sounds more like a faulty power supply. ?Switch mode power supplies are notorious for failing when being switched off, not on, as you might
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george edmonds
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#92731
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Re: Readings from 436A power meter using 82357B USB-GPIB?
Hello,
Many thanks. I have been successful in all the steps you mention using the
Arduino converter, but I need to activate REN for sending a command and
then deactivate REN before reading.
This is
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Staffan
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#92730
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Re: 50 ohm thermocouples was RE: [HP-Agilent-Keysight-equipment] Issue with homemade diode power sensor for HP meters
Hi
What are frequently called RF thermocouples are in fact three or four terminal devices with a heating element (50 Ohm or 75 Ohm resistance) with an embedded thermocouple.
73 George G6HIG
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george edmonds
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#92729
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Re: 50 ohm thermocouples was RE: [HP-Agilent-Keysight-equipment] Issue with homemade diode power sensor for HP meters
Are these thermocouples or thermistors?
These are different.
Glenn
WB4UIV
--
-----------------------------------------------------------------------
Glenn Little ARRL Technical
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Glenn Little
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#92728
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E4440A won't switch on
Hi, we have a E4440A 26 GHz spectrum analyser at work. Last time I used it was a year ago, and all was fine. Last week a colleague moved it to a different lab and it wouldn't turn on. The standy LED
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Gavin Watkins
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#92727
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Re: Readings from 436A power meter using 82357B USB-GPIB?
A simple task...
But it is NOT IEE488.2 compliant, so will not respond to such things as
*IDN? etc.? (In fact, traffic like that can totally mess it up at times,
as can other automated tricks to
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Dave_G0WBX
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#92726
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Re: Readings from 436A power meter using 82357B USB-GPIB?
Hi,
Red Herring alert!
FWIW I use Prologix interfaces (with the 'auto-read-after-write' feature disabled) and program using mostly AutoIT or EZGpib/Pascal s but I don't have to treat the 436 or 438
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Adrian Nicol
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#92725
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Re: Synthesizer module in ESG series E4435B
I am making a trial run of few PCBs and I have a E4425B with "250MHz..350MHz unlock problem" to try it on.
I will document the process as I do it.
Cheers
Leo
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Leo Bodnar
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#92724
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Re: Farnell PSG 1000
Ji Roland,
I have one of these sig gens and like it a lot. I suspect your problem might be due to the not very intuitive keying sequence for setting modes frequencies and levels. I know it has puzzled
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g3xyv
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#92723
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Re: Readings from 436A power meter using 82357B USB-GPIB?
Hello,
Is this working with the 82357, it would be a great starting point.
Although I just don’t understand why interactive IO doesn’t work.
Has anyone experienced differences between
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Staffan
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#92722
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Re: Synthesizer module in ESG series E4435B
Great job Leo
Certainly interest here for a drop in PCB, gerber files, the copies of the schematics you worked out the existing functions or even the chip number for the Hittite prescalar:- basically
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Dave Ireland
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#92721
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Re: A homemade diode power sensor for HP meters
some good reading here.
https://www.boonton.com/forms/principles-of-power-measurement-form
Easier to search for "boonton principles of power
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RFI-EMI-GUY
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#92720
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Re: 50 ohm thermocouples was RE: [HP-Agilent-Keysight-equipment] Issue with homemade diode power sensor for HP meters
I have such an animal here a GM 460B with that TFT hermocouple. It is an ancient beast. They got bought up by Marconi down the line.
https://patents.google.com/patent/US3384819
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RFI-EMI-GUY
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#92719
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50 ohm thermocouples was RE: [HP-Agilent-Keysight-equipment] Issue with homemade diode power sensor for HP meters
General Microwave used to make thinfilm 50 ohm thermocouples for their power meter sensors. I don’t know if they are in business any more. Regards, John Burgar
Sent: Monday, November 19, 2018
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John E. Burgar
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#92718
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Re: A homemade diode power sensor for HP meters
The article "Very-Low-Level Microwave Power Measurements" shows why a diode sensor is good for low levels,
not 0dBm, so it's good for measuring low power chip radio output with a receiving antenna a
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John Griessen
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#92717
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