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Old 7th Oct 2018, 2:26 pm   #1
JCUKVINTAGERADI
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Question Hameg HM605 Ready To Roll

Hi all

I have cleaned up the entire fascia (looks like new) remove all dust from outside/in. I have cleaned all the pots and switches and put it back together.

Switched it on and all is well. I don't have any probes yet they arrive tomorrow so here's a question for you.

Whats the first things I should do when I get my probes to test the scope or calibrate things?

Regards
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Old 7th Oct 2018, 4:24 pm   #2
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Default Re: Hameg HM605 Ready To Roll

Stick a known audio input signal in? You could use software like Audible for that. Use the scopes probe calibrator?

Someone has made the HM605 calibration check instructions available on the EEV Blog forum.

Andrew
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Old 7th Oct 2018, 4:58 pm   #3
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Default Re: Hameg HM605 Ready To Roll

Cheers Andrew will see if I can see that post on the EEVblog forums as a member
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Old 7th Oct 2018, 5:10 pm   #4
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Default Re: Hameg HM605 Ready To Roll

Just been on the forum and did a couple of searches but cannot find anything about the HM605 calibration.
Any ideas on where to search?

Regards
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Old 7th Oct 2018, 5:19 pm   #5
David G4EBT
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Default Re: Hameg HM605 Ready To Roll

I can email you the manual if you don't have it. (I assume that you don't have it, otherwise you wouldn't be raising the query). Without the manual it will be next to impossible to understand the controls, where to set the switches, how to conduct tests with the scope and how to get the best out of it.

The 605 has a built-in calibrator to test the accuracy of the Voltage and frequency of the scope. It's unlikely that the calibration will be out, but you must have the controls correctly set when checking it. For example, in the centre of each of the two 2- position timebase control switches, is a small knob called a 'timebase variable control'. That must be set to the 'Cal' position when checking the calibration or you'll get misleading results.

If you look at the bottom of the faceplate towards the left, you'll see a square button marked 1kHz/1MHz. To the right of that are two little sockets marked 0.2V & 2V. If you connect your scope probe to either socket you can check the Volts/Div and either 1KHz/1MHz and will observe a square wave on the screen. Obviously you can check each trace individually.

So if your Volts/Div control is set to 2V and you've selected the 2V/Div socket, you'd expect to see a square wave one division high, and likewise, on the 0.2V socket and 0.2V/Div on your Voltage control, you'd expect to see a square wave one division high.

When you get your scope probe, it may need adjustment so if the square wave isn't actually square, but for example has some rounder corners, that will almost certainly be due to the probe - not the scope. That's explained in the manual.

Your scope also has a useful component tester which gives a range of displays on the screen for capacitors, diodes (zener/silicon/germanium etc).

Views will differ on the usefulness or otherwise of scopes in radio servicing.

Very useful for observing waveforms, checking for the presence of signals, looking for distortion, by for example injecting a sine wave into an amplifier stage and checking if you get a pure sine wave at the output, or see signs of clipping. For example, setting up the audio stage of certain radios (Roberts/Hacker etc),

A scope is handy to give some indication of Voltage and frequency, but I rarely use mine as a means of accurately measuring frequency - I use a frequency counter for that.

Hope that helps a bit.

I'm not setting myself up as a 'scope expert - I'm just a novice but I have a Hameg myself (just a 203-7) and am quite a fan of them.

Hope that helps a bit.
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Old 7th Oct 2018, 6:01 pm   #6
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Default Re: Hameg HM605 Ready To Roll

Hi David

Thanks for all that info and will be looking at it tomorrow when my probes arrive.

I have the English USER manual if that is what you are referring too (I haven't read it yet though) otherwise if you have the Service manual in English that would be great if you could send it to me at chris@jchall.com. I have the German service manual and tried to convert it but there are too many errors to understand the important bits.

Looking forward to tuning this scope to make sure its were it should be before I start on my journey of scope using (need to get an analogue storage scope next as feel it is better to work up from the bottom and learn )

Regards
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Old 7th Oct 2018, 8:36 pm   #7
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Default Re: Hameg HM605 Ready To Roll

None of the English versions of Hameg user manuals have any service data, circuits, PCB layout. Sometimes that's only in the German manuals, other times, for some odd reason, in the Spanish manual. Since Hameg was subsumed into Rhodes and Schwartz, there are fewer and fewer Hameg manuals available on the legacy library at R & S Website. I downloaded those that I could back in 2011/12 when Hameg were still on the go.

The German full 51-page manual (it's the User Manual in German, plus service data), does actually have English service data in it on pages 39, 49 and 50, and has a glossary of terms in both German and English. The circuits and block diagrams also have both German and English annotations. It shows Voltages, test points, positions of internal controls such as pre-set pots, but there's little that the average user can do to test, diagnose and rectify faults without specialised equipment and the knowledge to go with it.

For example, suppose you consider that the trace might not be as bright as you think it should be. There are several points in excess of 1.2kV and there's 13KV on the scope tube. If you think those voltages are lower than they should be, how are you going to safely measure them? Even on PCBs where you may need to do live testing to check lower Voltages, do you have the knowledge and equipment to be able to do that safely when hazardous Voltages may be just inches away. Ride at your own risk!

I think at this stage it would be best to familiarise yourself with the user manual - how to set the controls, what features and benefits the scope has, what to expect to see on the screen, how to interpret the traces, but leave the lid firmly screwed on. Hopefully, you'll find that the scope doesn't malfunction in any way.

Your scope will measure up to 60 MHz (probably way beyond that - my 20 MHz 203-7 goes up to 55 MHz), but the time-base controls (not surprisingly) are marked in time divisions in ms and µs, and usually, it's frequency that we're interested in so we need to know how to convert that into frequency. For example, if we see ten cycles on the screen on a particular timebase setting, what does that mean in frequency? Is it 100 Hz, 1 kHz, I MHz? etc. What if we see one cycle on the screen at a particular timebase setting?

It can be quite confusing at times. When testing, if I see anything on the screen beyond a flat line, I see it as a sign of life, and where there's life, there's hope. A flat line today, then I reversed the connections on a transistor, and I was rewarded with a nice sine wave. Thank you Hameg!

Every good wish with the scope Chris.
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Old 8th Oct 2018, 12:35 am   #8
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Default Re: Hameg HM605 Ready To Roll

Hi David

A lot of what you have said has gone way beyond my knowledge but yes looking forward to getting stuck in and asking more questions in the near future.

The lid has been of already as I said I have cleaned and inspected every nook and cranny and after a re-assembly everything 'seemed' to be working correctly fingers crossed.

Regards
Christopher
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Old 8th Oct 2018, 1:02 am   #9
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Default Re: Hameg HM605 Ready To Roll

Another thing to try, look at various loose components with the scope in 'component analyser' mode. Try diodes, transistors and capacitors especially.

The 'Component Analyser' is a useful extra tool which almost all Hameg scopes and very few others have built in - it takes a certain amount of skill / interpretation to use and works best on disconnected / out of circuit components, but with more experience can also be used on in-circuit components as long as the likely effect of other components in the surrounding circuit is allowed for.
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Old 8th Oct 2018, 6:11 am   #10
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Default Re: Hameg HM605 Ready To Roll

"I have the English USER manual if that is what you are referring too (I haven't read it yet though)" no one, or hardly anyone ever does, we know better till we get stuck : )

Do you have a signal generator? If not use Audacity or similar online sig gen type software or use a low voltage transformer to stick a signal in, but as already mentioned it should have a square wave OP to check the amplitude.

Not used the component analyser on the Hameg's, but they are great for looking at various devices; caps do circles (ish), resistors straight lines, diodes curves like the datasheets - good fun and educational too.

Andy.
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Old 8th Oct 2018, 1:34 pm   #11
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Default Re: Hameg HM605 Ready To Roll

Quote:
Originally Posted by JCUKVINTAGERADI View Post
Just been on the forum and did a couple of searches but cannot find anything about the HM605 calibration.
Any ideas on where to search?

Regards
All I did was put HM605 in the search bar (on EEV) and it was the seventh thread down.

Andrew
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