| Products > Test Equipment |
| Hantek HDG2002B AWG: 5Mhz or 100MHz? Let's see! |
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| Berni:
--- Quote from: Simon on October 24, 2015, 07:27:04 pm ---So are these still hakable ? the thread started over a year ago and they are still on ebay for £209, should i get one. All the other signal generators seem to be silly money or Siglents. --- End quote --- It has worked on mine using firmware from 15.Aug.2015 .Sadly i am not very happy with how buggy the whole thing is when using it for anything more than basic sine triangle square. |
| Simon:
hm, even the 20MHz version is not badly priced, found one at £200 or less, can live with that and look into hacking it later. Sadly I've not spotted anything else I'd be happy with that is not priced out of this world, seems sig gens are pricier than scopes, I'm not rushing off to buy a siglent, I'm no fan of owon having experienced their scope and I'm getting fed up with people advertising generators that can only do the frequency advertized on one waveform type and all others are significantly (order of magnitude) lower frequency than the headline. |
| Berni:
--- Quote from: Simon on October 24, 2015, 10:38:11 pm ---hm, even the 20MHz version is not badly priced, found one at £200 or less, can live with that and look into hacking it later. Sadly I've not spotted anything else I'd be happy with that is not priced out of this world, seems sig gens are pricier than scopes, I'm not rushing off to buy a siglent, I'm no fan of owon having experienced their scope and I'm getting fed up with people advertising generators that can only do the frequency advertized on one waveform type and all others are significantly (order of magnitude) lower frequency than the headline. --- End quote --- Yes that is the reason i got mine, it was really cheep off ebay and it has some really nice specs going for it. Oh and keep in mind that due to the not super high 250MS/s sample rate ans fixed clocking implementation it can sometimes suffer quite a bit of "DDS jitter" at high speeds. For example 20MHz output (Not an integer multiple of 250) will have its edges jump around by 4ns. This tends to be not all that visible on a sine wave (Will still clearly show up on a spectrum analyzer tho) but since that square wave only has a 50ns period it means that its period will jump around by as much as 8% as the square wave will be made from a combination of 48ns and 52ns long pulses that average together over the long term to 50ns. Not to alarm you since most low end DDS based signal generators will have this flaw. Its just that the fast sampling (1GS/s and such) ones hide the flaw better. But to be fair in a lot of cases the jitter won't cause any issues. Just know that if you use such a jittery clock on a ADC or DAC its performance will plummet, also might possibly send some fast PLLs in to a bit of a weeble wobble. Just something to be aware of when you are using one. |
| Howardlong:
If the test is "how long did it remain on the bench?" then I'm afraid this device didn't fair at all well. It has the hardware of a reasonable low end AWG, but the software is just so broken I can't recommend it, other than for a bit of soldering practice to add the LAN port or high speed frequency counter, and the fun of hacking it. Even when I do use it, I daren't apply it to a DUT without checking what it's generating first. If you do add the high speed frequency counter, be aware that the latest software breaks this (and the low speed one too). |
| Simon:
Well I've ordered a 20MHz variant and yes I begin to suspect that the reaon it has 16bit DAC is that it uses the resolution to generate low voltage signals too, rather than have a viariable output. My only other option would be one of those really cheap and nasty generators that have a very poor user interface (we have one at work because it's all they would buy of course). |
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