Products > Test Equipment
Lecroy 4054HD vs Siglent SDS6204A eval
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jayk:
I've got a pair of scopes to try out for a week: Siglent SDS6204A and Lecroy 4054HD (unfortunately the 4104HD wasn't available for eval).  Both have all options and latest FW.  I've got a bunch of things I want to test, but if anyone has any particular comparisons they'd like to see let me know and I'll see what I can do.

Just to start here are some pics and noise comparisons, with full BW and with 200MHz BW limiting.


rf-loop:
You use RMS in the measurement, which also include DC component (for example, the DC offset of the channel, which is usually not completely zero)

When measuring the amount of noise, you should use AC RMS measurement.
On a Siglent oscilloscope it is Stdev in the measure select menu. (which is mathematically just RMS without the DC component, also called AC RMS)

jayk:
Thanks... missed that... will retest later.
jayk:
Here are some pulse captures (not super-fast... 2ns rise/fall time).  Nice improvement from the hi-res mode.

The web control on the Siglent is awesome... works great.  Unfortunately nothing like that on the Lecroy - just a basic web page you can use to capture the current screen image.  I thinkg there's some software you can buy, but it's not part of my demo.

I do like being able to drag a square around a region on the Lecroy and having a zoomed version of that open.  That doesn't seem to work on the Siglent.


jayk:

I've found lots of little bugs in the Siglent UI.  After capturing a sequence of I2C transactions I can scroll through them on the History List popup but the index number and time displayed at the bottom are incorrect.  I've had the I2C SDA threshold change to 13.0V a couple of times while not in the Trigger menu at all.  Also there are some incorrect messages (like misidentifying a differential probe as a current probe).  This stuff is pretty minor but a little disappointing for a product released in 2021 that's had 7 firmware updates (my demo unit has the latest version).

The Lecroy UI just overall looks nicer and is functionally better with respect to serial decoding.

I've had the Siglent lock up a couple of times and require a reboot - happened when I was trying to do a sequence capture, but I haven't been able to reproduce it.

The Siglent feels slightly more responsive in terms of menus opening and closing.  I find the Siglent UI somewhat more efficient by having most of the menus pop up in a strip on the right side of the screen.  The Lecroy opens a strip at the bottom that requires more hand motion to make changes.

The big 1280x800 screen on both scopes is great.  Would be hard to go back to a smaller screen.

The Lecroy can get it's date and time from the internet... the Siglent cannot.

I don't have a siggen suitable for measuring bandwidth, but I have one of the Bodnar pulsers and made some measurements with that:

Rise time    BW                BW
(ps)          (BW*RT=0.35)   (BW*RT=0.45)
                MHz                   MHz
222.0   1576                   2027    SDS6204A + SAP2500D, probing unused output of driver on Bodnar pulser
253.0   1383                 1778    SDS6204A, pulser plugged into scope, normal acq
369.0   948                   1219    SDS6204A, pulser plugged into scope, hi-res +1bit mode
430.0   814                   1046    4054HD, pulser plugged into scope
668.0   524                   673      SDS6204A, pulser plugged into scope, hi-res +2bit mode

My pulser is an SMA output so I have a couple of adapters to convert to BNC and that may be costing my a little bandwidth.

This 4054HD is spec'd at 500MHz, but I wonder if there's actually any difference between it and the 4104HD (which is spec'd at 1GHz).  Or maybe Lecroy just specs BW really conservatively and the 4104HD is actually more like 1.5-2GHz.  With the 5Gsps converters, seems like Lecroy could offer something closer to 2GHz.

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