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Recent content by auato

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    HP8565A spectrum analyzer and negative frequency on the front panel readout - help

    Hi mates, I bought an HP8565A spectrum analyzer which is not in a great conditions so I have to verify some issues and attempt some fixing. If you know that instrument, please can you help me? First strange thing is the frequency band range in the first band: when the button of the first band is...
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    quaestion about asynchronous spectrum analyzer and sweep generator...

    Thanks everyone. I would like control both but it is not simple at all.. tought I have many signals outgoing the instruments like ramps, pules, triggers and so on and the possibility to switch both for external triggers or external ramps control functions... but I already spent two days playing...
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    quaestion about asynchronous spectrum analyzer and sweep generator...

    Hello everyone. I don't find any way to talk my spectrum analyzer (HP 8595E) with a Wiltron programmable sweep generator. I already tried all combinations and read two service & operator manuals but... nope. Tried to drive the sweep generator using the exiting sweep ramp from the spectrum...
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    [SOLVED] Reverse eng of a PCB: unknown components and polarity...

    OK, this afternoon I done my first attempt. Looking the part of diagram rewritten above, in my opinion, the pole + and the pole - is like drew in the previous picture. Result: no power on :-( ... but if I connect the battery, it turns on. The Max 1775 runs fine and even the next stage of...
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    [SOLVED] Reverse eng of a PCB: unknown components and polarity...

    @FvM, thank you very much, finally I discovered it is a PMOS array. Exactly. I want to use an external power supply but I don't know the polarity and I am afraid to blown the instrument. I know instead the specs (6VDC 850mA). I don't know this way. Please, teach me how to recognize quickly the...
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    [SOLVED] Reverse eng of a PCB: unknown components and polarity...

    Hi all. I have an Aethra ADSL tester. Currently it runs with a battery but I would like to use it with an external power supply. Kinda I'm looking for identify two poles for the power supply. There are 4 pins on the power-in DIN-type connector. Looking the PCB some doubt are arisen about...
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    Help about obsolete Delkim RX2000 RF module - fixing or modify

    Here a brief video to show the annoying noise when the RX2000 runs: I don't know well where to focus my investigation between the RF module and the digital board below. The digital board is equipped by a PIC 16C84 and an audio circuity. Next days I will replace all the electrolytic caps and...
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    Help about obsolete Delkim RX2000 RF module - fixing or modify

    Thanks BigBoss. What do you mean for I/Os?
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    Help about obsolete Delkim RX2000 RF module - fixing or modify

    Hi guys. Glad to meet you again :-) I would like to get some informations about this RF module. It is fitted over a Delkim RX2000 receiver (an alarm and wirless system for fishing) of a friend of mine. My friend bought this system some years ago from UK. The whole system runs for 418MHz. Now...
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    TPI 183 DMM: strange LCD display faded. I need your opinion...

    Hello everyone. I would like to know your opinion or the TPI 183 DMM's owners opinion about the strange angle of viewing of the LCD display: if you look the DMM placing the LCD display in front of you or even worse looking down from above, you can note that the segments are very faded. Instead...
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    THURLBY THANDAR PL320T GP Power Supply - Help for remote GPIB communication commands

    Thanks Sonics!
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    THURLBY THANDAR PL320T GP Power Supply - Help for remote GPIB communication commands

    Thanks Brian. I wrote to TTI ... hope for a quick reply. I take this opportunity to post a second more detailed video Already tried to enter some random numbers to try to set V and I without success :-? Regards Ciro
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    THURLBY THANDAR PL320T GP Power Supply - Help for remote GPIB communication commands

    Hi all. I have an old TTI dual power supply (PL320T-GP) and I'm trying to drive it through a USB-GPIB interface. I don't know if the PL320T's GPIB interface runs correctly but I am sure that the USB-GPIB int. works well (I can control perfectly my Fluke 45 DMM). Looking the video below, you can...
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    faults & shorts locator: Polar Toneohm 700. How to create new homemade probes?

    Re: faults & shorts locator: Polar Toneohm 700. How to create new homemade probes? Thank you Brian. Sorry, but I don't understand the second part of your reply when you wrote: What do you mean with the word "inner" and the word "core"? Has each cable a single central wire (the inner) and a...
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    faults & shorts locator: Polar Toneohm 700. How to create new homemade probes?

    I found this interesting instrument at a local flea market: It's a Polar Toneohm 700. It's a faults and shorts locator (an evolution of a continuity tester). but it isn't equipped by its original test leads. I tried to look in an old caisson of that flea market but it was filled of...
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