| Electronics > Repair |
| HM8030-3 |
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| anotherlin:
--- Quote from: oldway on May 16, 2018, 02:24:42 pm ---The only thing that exists is the adjustment procedure that I have already posted .... You can not understand that the HM8030-2 is a device for hobbyist, it is not a precision device .... There is not even a quartz to ensure the stability of the oscillator Calibrate a simple bullshit RC vco ? You are kidding or what? :-DD --- End quote --- I think you're a bit harsh regarding Hameg. They don't claim to be super high-end precision instrument, but it's more than enough for doing consumer electronics design/R&D (let's say audio). They are not built with cheap components and can be used professionally 40h a week, not only for hobbyist or education. Not all applications need a signal generator featuring an ovenized quartz reference. As for the HM8030-3, it seems to have more in common with the 8030-4 than 8030-2. Without an "adjustment" manual, it would be a quite tedious job to know which trimmer is doing what. |
| oldway:
I think you are very poorly informed about old HAMEG products. Hameg had developed 2 product lines: 1) a line of low cost products intended primarily for hobbyist called modular system 8000 series. This system consisted of a basic box with power supply for two plug-in modules. 2) a line of professional products for the industry called 8100 system. Your HM8030 belongs to the line of low cost products for hobbyist. For the industry, Hameg sold the HM8130 and 8131 function generators which cost 5 times more. Now, if you look at the diagram and analyze it, you will understand my statements. The HM8030 is not quartz locked oscillator, nor synthesized, It is a simple RC VCO, it does not even have a counter, if you want a minimum of accuracy, you must use an external counter. The precision will then be that of your external counter. NB: The HAMEG modular system 8000 series is not to be compared with TM500 / TM5000 of TEKTRONIX. Not the same level of quality, nor technology ! |
| anotherlin:
You don't get my point: For some professional use, sometimes, a basic/simple/entry level yet sturdy signal generator is all you need. If you're doing some consumer electronics, scientific lab precision, or GPIB programmable (like the 8100 series), are not needed. And in fact, the whole point of buying some (cheaper) Hameg instruments, is to have only what is needed to do your job correctly. That is, without spending 5 times more money than necessary. I personnaly owned Hameg's stuff in the past, notably the HM8030-4. Now I'm actually owning TM5000 and TM500 stuff. The quality between Tektronix and Hameg is the same. Hameg was built in Germany or France. The technology of Tektronix is of course better, Tektronix always targeted the high end, the high performance. So of course, the specification, precision, functionalities were better than Hameg. But the price (when new) is not the same. |
| oldway:
You enter into contradiction with yourself. If this instrument is sufficient for your applications, why look for a calibration procedure (which does not exist), simply make the adjustments described in the document I posted and it will be within the limits of the manufacturer's technical specifications. If you have any doubts, check the caracteristics of the function generator after the adjustment procedure I posted. The technical specifications of this function generator are very weak, for example: 1) Frequency stability: 0.1% / h (specified only for the medium position of the frequency control !!!) And the other positions? No specification for variations as a function of temperature! |O 2) THD sine: 3% from 0.1Hz to 1Mhz ... :-DD 3) Frequency measurement accuracy: from 0.1Hz to 1Mhz: 3% +/- Least significant digit. :-DD This is clearly a device for hobbyist and these technical specifications are not even acceptable today. Make adjustments recommended by HAMEG and your function generator will work perfectly. Stop inventing problems where there is none. |
| oldway:
About the comparison of the quality of Hameg and Tektronix products, here is my personnal experience. You will certainly agree that the quality level includes that of the components used. I bought a new Hameg HM605 oscilloscope in 1982 and I still use it. But, it had to be repaired a considerable number of times: Have to be replaced: CA3127 (twice), Bridge rectifier (twice) 2 electrolytic capacitors exploded, HV voltage multiplier, transistors 2N3866, many cold solders had to be resoldered. To be compared with the reliability of a 465 or 2235 Tektronix scope. :palm: |
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