EEVblog Electronics Community Forum

Products => Test Equipment => Topic started by: sijmen on November 15, 2019, 04:13:27 am

Title: Signal Generator - 16Kpts vs 16Mpts
Post by: sijmen on November 15, 2019, 04:13:27 am
Hi,

I'm looking to buy my first Signal Generator, and looking at the Rigol DG-1062Z and the Rigol DG-4062.

Ignoring all other features, the DG-1062Z has a waveform memory of 8Mpts standard and can be upgraded to 16Mpts, while the DG-4062 only has 16Kpts.

In real terms what does that mean to the typical user?
How many points are required for most signals?
Direction to any information to help me understand how the memory is used would be very helpful.

Regards,
Sijmen.
Title: Re: Signal Generator - 16Kpts vs 16Mpts
Post by: WhichEnt2 on November 15, 2019, 10:02:21 am
That memory is used for arbitrary waveforms which can be maked on editor or a device itself.
Title: Re: Signal Generator - 16Kpts vs 16Mpts
Post by: TurboTom on November 15, 2019, 10:45:45 am
I've got a DG4102 and several other AWGs with much bigger memory, and I've got to say that available waveform memory was never a constraint to me on any of those. I've got to admit that I rarely use arbitrary waveforms of my own. Those big memories should in theory permit to store complete audio samples or even short video sequences (ancient composite PAL / SECAM / NTSC format if anybody still uses or needs them). That is, one will find a software tool to somehow convert them into the native file format to upload into the generator.

TBH, I think the DG4000 series is a rather dated design and I would only consider it if it available at a real steal... And if I really need the connectivity and arbitration methods it offers, with separate SYNC outputs and TRIGGER / MODULATION inputs for each channel (other instruments -- Siglent -- just offer a single BNC for all these functions for BOTH channels, so you've got to choose and often certain setups just won't be possible) and a really decent frequency counter function. On the other hand, the DG4000 series doesn't feature "seamless" parameter change in some waveforms, which means the output (Pulse mode for example) will hickup for a few milliseconds if you change the pulse duration and likewise for other waveforms.

Before you buy an instrument, please look at the manuals and consider what features are most important for you. I'ld put waveform memory close to the last place of features affecting my choice. That's basically how I ended up with a total of three (four if I count the now half-way defunct "el cheapo" Hantek HDG2000) AWGs. And still I didn't find the "one for all jobs" instrument...

Cheers,
Thomas
Title: Re: Signal Generator - 16Kpts vs 16Mpts
Post by: _Wim_ on November 15, 2019, 07:56:21 pm
Hi,

I'm looking to buy my first Signal Generator, and looking at the Rigol DG-1062Z and the Rigol DG-4062.

Ignoring all other features, the DG-1062Z has a waveform memory of 8Mpts standard and can be upgraded to 16Mpts, while the DG-4062 only has 16Kpts.

In real terms what does that mean to the typical user?
How many points are required for most signals?
Direction to any information to help me understand how the memory is used would be very helpful.

Regards,
Sijmen.

The DG-1022Z can be made to think he is a DG-1062Z. (https://www.eevblog.com/forum/testgear/need-help-hacking-dp832-for-multicolour-option/200/ (https://www.eevblog.com/forum/testgear/need-help-hacking-dp832-for-multicolour-option/200/))

Just saying...