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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,
By Tobias Pluess · #92736 ·
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
By Mike N2MS · #92735 ·
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
By Peter Gottlieb · #92734 ·
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@...
By Dave / NR1DX · #92733 ·
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
By bill.lauchlan171@... · #92732 ·
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
By george edmonds · #92731 ·
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
By Staffan · #92730 ·
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
By george edmonds · #92729 ·
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
By Glenn Little · #92728 ·
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
By Gavin Watkins · #92727 ·
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
By Dave_G0WBX · #92726 ·
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
By Adrian Nicol · #92725 ·
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
By Leo Bodnar · #92724 ·
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
By g3xyv · #92723 ·
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
By Staffan · #92722 ·
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
By Dave Ireland · #92721 ·
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
By RFI-EMI-GUY · #92720 ·
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
By RFI-EMI-GUY · #92719 ·
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
By John E. Burgar · #92718 ·
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
By John Griessen · #92717 ·