HAMEG 203 6 PDF

By continuing to use the forum you conform your acceptance of these. If you are not happy to accept these you must stop using the forum and delete our cookies from your browser. Hameg Oscilloscope Repair. Hey Guys. Im currently studying a MEng masters degree in electrical and electronic engineering.

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By continuing to use the forum you conform your acceptance of these. If you are not happy to accept these you must stop using the forum and delete our cookies from your browser. Hameg Oscilloscope Repair. Hey Guys. Im currently studying a MEng masters degree in electrical and electronic engineering.

I wish to inform you upfront that I'm of the generation where you turn on an Agilent digital oscilloscope, press auto-scale and the magic happens, so you may need abit of patience with me. I have recently come into possession of a lovely old Hameg Oscilloscope. I have purchased some new Hameg HZ36 probes for it and seem to get some form of distortion in the display. When the probe is set to and connected to the 2V CAL squarewave, the readout appears as below.

For some reason the front edges curve into the amplitude of the wave like some form of reactive distortion. So I guess here are the questions I need the answers to: Is this device supposed to behave in such a manner?

Am I destined to permanently run this unit with the probes on ? Has anyone observed a similar unit or have experience working with similar units? If it isnt supposed to behave like this, does anyone know what could be causing this type of distortion Thanks in Advance ;-.

Re: Hameg Oscilloscope Repair. Originally Posted by quirkygord Its fair to say this oscilloscope has been through the wars it has quite literally been to afghanistan and back and is still in a reasonable condition and it would therefore be a travesty to discard of such a unit given that its probably old than I.

The fault may well be with the calibrator. Before you do any thing, try using the calibrator on a different scope and conversely look at your calibrator on a different scope. Good luck and welcome to the forum. I've just tried pushing a resistor into one the BNC Y socket inputs - on my 20 odd year old 20MHz Korean scope be careful not to damage the socket if you try this and connecting it to the calibrator 1KHz and 0.

I get a nearly perfect square wave without much mains pick up. Maybe that's worth a try to help eliminate the probe as a factor in the problem. I attach the circuits of the HM, which is a later version of the same model. It should give you all you want. The calibrator is a couple of TTL integrated circuits.

So is likely to either work properly or not at all. The 0. Your problem appears to be show the x1 probe with either output shows one pattern, and the x10 probe shows another.

I rather suspect that the x10 probe has been desperately overcompensated by adjustment of the probe capacitor to give a approximation of a square wave. The dip in the middle of the top in x10 suggests something is wrong.

I suggest XTC is on the right lines to solving it. If you have another scope, then GlowingAnodes's way is a quick and easy way to start to locate it. Run a short lead from calibration output to the Yinput. Try changing the Y amp gain settings, using both the attenuator switch and the variable gain control. Do this with both calibrator outputs, and each Y channel in turn, and different sizes of display. Please report back. Most interesting. That slow rise on a square wave is indicative of an integration circuit with an increased time constant.

That is series resistor input to output with capacitor across the output. I suspect bad connection in the Y Amp; perhaps the attenuator switches, or a dry joint, giving a higher series resistance to the next stage. Bill m0wpn. You need to test it with another source of square waves to narrow the fault down. Particularly when set to the most sensitive setting.

Each of the attenuators will have capacitive correction like in the probe to maintain bandwidth, and these are set up during calibration - it's possible one of these has been mis-adjusted or physically damaged. Also, is it the same on both channels - if so, that points to possibilities like the delay line and Y output stage Find More Posts by mhennessy. I have the HM service manual and user manuals as pdfs if you would like them.

Great little scope these, I had one for a few years. Attached Thumbnails. Hi Guys. Thanks for all the help, it's deeply appreciated. It's exam time at the moment so I'm hoping to get this sorted later in the week when I've finished my exams for the year. I have tried three different probes on both channels and on both AC and DC coupling and get exactly the same waveforms. When I received the unit the DC bias voltages and the trace rotation needed adjustment so it's quite possible that perhaps a component is malfunctioning inside.

I'll whip out the multimeter and get the DC voltages checked as suggested and keep you informed. Once again thanks for the help!

Last edited by Darren-UK; 16th May at pm. Reason: FSK problem fixed. The probe needs setting up to the scope. Please see the attached picture and at the BNC end you can see a small hole.

Your probe might not be exactly the same but the picture is usefull for illustative purposes In the hole you will find a small 'screw'. Adjust the screw untill the waveform becomes square. You will need to use a plastic tool or a copper trimming tool like the ones used for adjusting magnetic tape heads so as not to affect the reading by 'yourself'.

If your probes don't have this adjustment then i would be inclined to spend a little more money on a probe which has this adjustment. It will be worth it. This just looks like either the probe or the input attenuators need the compensation calibrating.

The service manual will tell you how. He's already tried adjusting the probe - see the second image where he's got the time-constant of the probe almost agreeing with the time-constant of the fault. At first I wondered if it was mal-adjustment of the input attenuators, but seeing as both channels behave the same, it seems more likely that the fault might be after the channel switching - perhaps the delay line or the amplifiers either side of it?

Either way, it looks like an interesting "challenge". Originally Posted by mhennessy. I don't have Spice here, but would agree with your analysis. The waveform looks like someone has turned the bass up, and your second circuit would do just that! Sorry to drag audio into this, but putting square waves through audio amplifiers and twiddling tone controls is useful for teaching some aspects of DC-transients. I think you're right to suggest that a second 'scope is required There's not much in there, not even a delay line and associated drive amplifier, so shouldn't be to hard to fix.

In this case it would probably be quicker to build the actual circuit than try to model it. Here are some pics of; 1. I hope this makes sense, like you say it's as if it's a LF boost rather than an HF cut.

Originally Posted by theoldtrout. Last edited by Darren-UK; 27th May at pm. Thread Tools. The time now is am. User Name. Remember Me? Mark Forums Read. Vintage Test Gear and Workshop Equipment For discussions about vintage test gear and workshop equipment such as coil winders. Hameg Oscilloscope Repair Hey Guys. Find More Posts by quirkygord Posts: Re: Hameg Oscilloscope Repair Quote: Originally Posted by quirkygord69 Its fair to say this oscilloscope has been through the wars it has quite literally been to afghanistan and back and is still in a reasonable condition and it would therefore be a travesty to discard of such a unit given that its probably old than I.

Posts: 1, Re: Hameg Oscilloscope Repair The fault may well be with the calibrator. Find More Posts by glowinganode. Re: Hameg Oscilloscope Repair I've just tried pushing a resistor into one the BNC Y socket inputs - on my 20 odd year old 20MHz Korean scope be careful not to damage the socket if you try this and connecting it to the calibrator 1KHz and 0.

Re: Hameg Oscilloscope Repair Quote: Originally Posted by quirkygord69 If it isnt supposed to behave like this, does anyone know what could be causing this type of distortion Bill m0wpn Attached Files.

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HAMEG HM 203-6 20mhz Oscilloscope

HAMEG as an independent company was closed. Other company divisions such as development Mainhausen and Chemnitz , product management, sales, customer service and quality assurance have remained independent. The range of products offered by HAMEG includes analog oscilloscopes , mixed-signal oscilloscopes MSO , spectrum analyzers , function generators , RF generators , laboratory power supply units, programmable power supplies and modular laboratory measuring components. The company primarily serves the entry-level segment of the market and is particularly used at electronics laboratories, production supervision as well as at schools and universities.

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Hameg HM203-6 20MHz Oscilloscope

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