Products > Test Equipment
MSO5000 Bode Plot Capability: Is it Good Enough? [Many tips about a 1st scope]
nctnico:
That 1.2Gs/s is not for real. The actual samplerate for the SDG2k units is 300Ms/s
jasonRF:
--- Quote from: balnazzar on October 05, 2022, 04:25:58 pm ---
--- Quote from: jasonRF on October 05, 2022, 11:53:24 am ---Has the OP considered used equipment? I don't know what the market and associated costs are when shopping from Europe, but in the US items like the Analog Discovery can be found with significant discounts. An Analog Discovery 1 just sold on ebay a couple of days ago for $130. Sure, it would cost an additional $40 for the BNC adapter and a couple of cheap probes, but it could still save $200 or more.
I don't think I would go that route for my first 4-channel benchtop scope, but for an AD I think the risk is relatively low.
Just a thought.
jason
EDIT: I haven't used any of hte scopes mentioned in this thread, but I am surprised by the high price of the Instek GDS1054B in the EU. In the US it often sells for less than the Rigol DS1054Z and the Siglent SDS1104X-U, which are closer competitors performance-wise. On paper the Siglent SDS1104X-E seems like a much better scope than the instek: dual ADCs, potential upgrades for MSO and Bode capability, more sensitive front-end (500 uV/div, versus 1 mV/div that includes some digital zoom according to the GDS1054B thread on the forums), actual BNC for the trigger out (I am pretty sure the Instek uses the probe compensation as the trigger out...), etc. Plus, if the OP already has the UniT siggen, there is a possibility that they (or someone else on the forums) will eventually figure out how to make it work with the Siglent Bode plotting.
Having said that, I thought seriously about purchasing a GDS1054B or GDS1202B for myself a number of months ago, but again I am in the US so price was a huge factor ($350 for 1054B vs $499 for SDS1104X-E; $310 for GDS1202B vs $380 for sds1202x-e). Of course that is why I am familiar with some of the quirks of the Insteks that have been posted on the forums.
jason
--- End quote ---
Used equipment: considered. But if you read here and there, for example a known problem of the AD/AD2 is the fragilty of the micro-USB connector. If you aren't careful, it will get broken or partially broken very soon. A lot of people on forums lamented that having purchased an used one, they found the connector 'working' but basically broken and sloppily repaired.. And too few vendors on ebay offer the return option, not to mention the hassle.
As for the scopes, unless you want to wait months, it's very difficult to get a good, modern scope, held in good conditions for cheap prices on ebay. I bought both the Siglent and the AD2 on Amazon. If I won't like one or them (or both), super easy return with no shipping costs.
Prices in EU: There are two factors that impact badly. We have higher import duties for the distributors, and we have VAT for the end customer. That's why healthcare and education is free, here. It's not free, you just pay in advance.
--- End quote ---
I obviously did not know about the AD fragility - glad you mentioned it. I doubt I will ever recommend a used AD again! I have so far had good luck with used test gear (my basic dds function generator, super-basic power supply and fancy picoscope were all used ebay specials). I of course completely agree about purchases from Amazon, as much as I hate to shove more money at the owner. I buy from other vendors whenever possible for books and other supplies even if it costs a few extra dollars, but with their return policy it sometimes just makes the most sense to buy large-ticket items from them.
Cheers,
Jason
Fungus:
--- Quote from: balnazzar on October 05, 2022, 04:25:58 pm ---Used equipment: considered. But if you read here and there, for example a known problem of the AD/AD2 is the fragilty of the micro-USB connector. If you aren't careful, it will get broken or partially broken very soon.
--- End quote ---
Yep. It looks/feels quite fragile. I've always been very careful with mine.
Maybe some preemptive epoxy might be called for.
tautech:
--- Quote from: jasonRF on October 05, 2022, 11:53:24 am ---Has the OP considered used equipment? I don't know what the market and associated costs are when shopping from Europe, but in the US items like the Analog Discovery can be found with significant discounts. An Analog Discovery 1 just sold on ebay a couple of days ago for $130. Sure, it would cost an additional $40 for the BNC adapter and a couple of cheap probes, but it could still save $200 or more.
I don't think I would go that route for my first 4-channel benchtop scope, but for an AD I think the risk is relatively low.
Just a thought.
jason
EDIT: I haven't used any of hte scopes mentioned in this thread, but I am surprised by the high price of the Instek GDS1054B in the EU. In the US it often sells for less than the Rigol DS1054Z and the Siglent SDS1104X-U, which are closer competitors performance-wise. On paper the Siglent SDS1104X-E seems like a much better scope than the instek: dual ADCs, potential upgrades for MSO and Bode capability, more sensitive front-end (500 uV/div, versus 1 mV/div that includes some digital zoom according to the GDS1054B thread on the forums), actual BNC for the trigger out (I am pretty sure the Instek uses the probe compensation as the trigger out...), etc. Plus, if the OP already has the UniT siggen, there is a possibility that they (or someone else on the forums) will eventually figure out how to make it work with the Siglent Bode plotting.
Having said that, I thought seriously about purchasing a GDS1054B or GDS1202B for myself a number of months ago, but again I am in the US so price was a huge factor ($350 for 1054B vs $499 for SDS1104X-E; $310 for GDS1202B vs $380 for sds1202x-e). Of course that is why I am familiar with some of the quirks of the Insteks that have been posted on the forums.
jason
--- End quote ---
Highlighted a few of your points which I'll make comment on.
for my first 4-channel benchtop scope
Every buyer has a different need and budget and the wiser add addition functionality into their purchase for them to grow into.
Siglent SDS1104X-U
A very different beast to SDS1104X-E although they look very similar. X-U is more of a basic DSO without all the good bits the 4ch X-E has. In the context of this thread it falls well short on the feature set required.
potential upgrades for MSO and Bode capability
Bode plot capability is a standard feature in several Siglent DSO's and not an upgrade at all.
$380 for sds1202x-e
Again another model that doesn't measure up in the context of this thread as it also falls short on the feature set required however another series that can measure up is the 2GSa/s 2ch SDS2202X-E as these do have the webserver and Bode plot capability the OP requires but they are $ 620. But still the SDS1104X-E has a larger and better feature set.
balnazzar:
--- Quote from: nctnico on October 05, 2022, 05:00:23 pm ---That 1.2Gs/s is not for real. The actual samplerate for the SDG2k units is 300Ms/s
--- End quote ---
Two questions:
1. Why do they declare 1.2 GSa/s?
2. Is the actual sample rate of the 1000X even lower?
Thanks!
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