Products > Test Equipment
Has any one measured the -3 dB point for a SDS2104X HD w 100 to 200 MHz Update?
tomwilkinson:
I have a SDS2104X HD and I measured the -3 dB point at around 180 MHz, one channel in use. I was wondering if it is worth buying the 100 MHz to 200 MHz upgrade (SDS2000HD-BW1T2)? What is the -3 dB point after the upgrade? If it is not 260 MHz or better, I don't think it is worth the $830. When I upgraded my SDS2104X+ to 200 MHz its -3 dB point changed to 257 MHz, but I wanted to verify that the same thing will happen with the SDS2104X HD.
tautech:
Data point fwiw:
SDS2104X Plus -3dB BW ~185 MHz < tested with 3 sources that agreed within 5 MHz
SDS2204X Plus ~300 MHz < tested with one of the 3 used above.
As 2000X HD is also a 500 MHz design I would not expect it to be much different.
Corrected.
voltsandjolts:
--- Quote from: tautech on February 24, 2024, 08:09:05 am ---As 2000X HD is also a 500 MHz design I would expect it to be much different.
--- End quote ---
Did you mean..
"As 2000X HD is also a 500 MHz design I would not expect it to be much different."
?
Martin72:
--- Quote from: tomwilkinson on February 24, 2024, 05:54:51 am ---I have a SDS2104X HD and I measured the -3 dB point at around 180 MHz, one channel in use. I was wondering if it is worth buying the 100 MHz to 200 MHz upgrade (SDS2000HD-BW1T2)? What is the -3 dB point after the upgrade? If it is not 260 MHz or better, I don't think it is worth the $830. When I upgraded my SDS2104X+ to 200 MHz its -3 dB point changed to 257 MHz, but I wanted to verify that the same thing will happen with the SDS2104X HD.
--- End quote ---
Hi,
Not so long ago there was a promotion where you could upgrade to 200Mhz for free.
Maybe members of the forums had taken part and could answer your question directly.
Indirectly, I can say that the bandwidth is always a little more "generous" due to the filter.
Here is a picture of the bandwidth of my SDS2504X HD (legal on 500Mhz), the -3dB point was at 576Mhz.
(The blue line shows the bandwidth at 350Mhz, it is then at approx. 430Mhz).
Martin
jonpaul:
plots reveal poor measurement technique or setup.
Or perhaps poor scope design.
Ripples perhaps from poor VSWR.
Compare to Tektronix scopes with similar BW, both analog and digital scopes never show such horrible aberrations.
Suggest to get a fast edge gen (Leo Bodnar pulser) and check transient res with precision 50 Ohm term and precision 50 Ohm cable.
j
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