Agilent DSO1014A scope - increasing bandwidth from 100MHz to 200MHz

[Leo Bodnar]

Hi,
I have Agilent DSO1014A 4 channel 100MHz scope.  Here is how I have increased the bandwidth from 100MHz to 200MHz.  The scope uses BW crippling method similar to Rigol DS1052.

I have pulled up the cathode side of the diode to a level that stops the current flowing through it.  The 20MHz BW limit still works fine.
The wire link on the IC looks dodgy but it is due to the camera looking at it slightly at angle.  It's sitting right on top of the pin.
Pulse rise time improved but it's a bit misleading - look how the pulse shape and amplitude have improved.  Slew rate increased dramatically.

Cheers
Leo



before: 100MHz BW


after: 200MHz BW

[saturation]

Nice work!  Is the hack finally just the jumper shown by the blue wire?  Is there Rigol engineering in this model?  It looks like Rigol's bigger brother.

[flolic]

 Is there Rigol engineering in this model?  It looks like Rigol's bigger brother.

By the look at that erased IC labels, I think yes 

[Leo Bodnar]

Yes, it is a rebadged Rigol.  

The hack adds a 3kOhm pull-up resistor marked by the arrow.  I have update the picture.
There are lots of +5V points closer to the point of interest but it looks like analogue and digital +5V circuits are separated so I have used digital +5V to be consistent with the rest of the control schematic.

Cheers
Leo

[drieg]

Agilent DSO1004A = Rigol DS1064B
Agilent DSO1014A = Rigol DS1104B
Agilent DSO1024A = Rigol DS1204B

...and both can be "improved" in a pure software way

[saturation]

Awesome!  Sorry for being lazy in checking it out, yet another scope brought up to new highs by clever EEs!

[eurisko]

I am sorry to bump such an old topic.

But i am little confused with the Rigol 1000B series.

Right now in Europe they are oferring the Rigol DS1074B(70 Mhz) is it the same scope than the Rigol DS1064B(60 Mhz) US?

Is any of them upgradable to 100 MHZ?Does anyone here on the forum owns one of this models?

Right now at 799€ (DS1074B) with taxes i think it's a great value for a 4 channel scope. what do you guys think?

[rf-loop]

Memory16 kpts (2 channels)
8 kpts (4 channels)
This is really bad. Really bad today.

also 320x240 pixel monitor.
is it really today? Yes it can use but after one time looking 7 or 8" 800x480 or 800x600... there is no road to back.

[alm]

Memory16 kpts (2 channels)
8 kpts (4 channels)
This is really bad. Really bad today.

also 320x240 pixel monitor.
is it really today? Yes it can use but after one time looking 7 or 8" 800x480 or 800x600... there is no road to back.

I agree that memory depth is quite limited compared to the current two channel scopes. Since you clearly believe that the only low-end scopes worth buying these days are made by Owon, which four channel Owon scope would you recommend instead? What other affordable four channel scopes with 1M+ memory and better than QVGA resolution are currently available?

[rf-loop]

Memory16 kpts (2 channels)
8 kpts (4 channels)
This is really bad. Really bad today.

also 320x240 pixel monitor.
is it really today? Yes it can use but after one time looking 7 or 8" 800x480 or 800x600... there is no road to back.

I agree that memory depth is quite limited compared to the current two channel scopes. Since you clearly believe that the only low-end scopes worth buying these days are made by Owon, which four channel Owon scope would you recommend instead? What other affordable four channel scopes with 1M+ memory and better than QVGA resolution are currently available?

Exactly no. I only tell that this memory is tiny and display is littlebit small size but more bad it have also very low resolution.

In this price if really need 4 channel, maybe can live with this display and memory. This price is nice.
But it need realize that sampling speed go slow very fast with this kind of memory with lower horizontal speeds so that there do not then come disappoint in real life. (example with aliasing)

If want more there need jump markable higher price.
If have this posibility in budget, then there is selectable many very good candidates.
One example is this: HMO724
(as I say, one example. There are many and this example may be not best. Also what is ok depends lot of what is really need)