Products > Test Equipment
Bandwidth limit on Siglent SDS2000X Plus oscilloscope
TimFox:
One problem with using 0.35/Trise is knowing in advance what the actual rise time of the pulse source is.
Approximately, the two rise times (pulse and scope) add in quadrature.
TheDefpom:
The Leo Bodnar pulsar is sold as a 40ps unit, but comes with a cert showing what the supplied unit is actually doing, mine was ~35ps
seronday:
--- Quote from: tautech on July 19, 2023, 07:23:33 pm ---
--- Quote from: seronday on July 19, 2023, 11:21:36 am ---Out of curiosity, what reference frequency did you use for the -3dB bandwidth calculation ?
--- End quote ---
No calculations are required when you have a 3.2 GHz RF gen. ;)
Only a check levels are correct at some base frequency before pushing upward, we used 100 MHz 1V p-p as mentioned here:
https://www.eevblog.com/forum/testgear/bandwidth-limit-on-siglent-sds2000x-plus-oscilloscope/msg4968844/#msg4968844
Otherwise if using the Bodnar pulser, it provides extremely fast edges @ 10 MHz
--- End quote ---
OK. Thanks Tautech.
I did not realize that Siglent had specified the BW performance verification test differently for the SDS2000X Plus.
In the service manual for the SDS2000X HD, section 5.4, Siglent specify using 1 Mhz as the frequency for the reference level when working out the bandwidth performance.
Regards.
tautech:
--- Quote from: seronday on July 20, 2023, 12:34:13 am ---
--- Quote from: tautech on July 19, 2023, 07:23:33 pm ---
--- Quote from: seronday on July 19, 2023, 11:21:36 am ---Out of curiosity, what reference frequency did you use for the -3dB bandwidth calculation ?
--- End quote ---
No calculations are required when you have a 3.2 GHz RF gen. ;)
Only a check levels are correct at some base frequency before pushing upward, we used 100 MHz 1V p-p as mentioned here:
https://www.eevblog.com/forum/testgear/bandwidth-limit-on-siglent-sds2000x-plus-oscilloscope/msg4968844/#msg4968844
Otherwise if using the Bodnar pulser, it provides extremely fast edges @ 10 MHz
--- End quote ---
OK. Thanks Tautech.
I did not realize that Siglent had specified the BW performance verification test differently for the SDS2000X Plus.
In the service manual for the SDS2000X HD, section 5.4, Siglent specify using 1 Mhz as the frequency for the reference level when working out the bandwidth performance.
Regards.
--- End quote ---
Not exactly.
Tests are done starting at 1 MHz to beyond DSO rated BW.
Eg, for SDS2104X HD all the below frequencies are used and documented for verification checks = does it or not pass a Cal.
1M, 1.14M, 1.31M, 1.50M, 1.72M, 1.97M, 2.25M, 2.57M, 2.95M, 3.37M, 3.86M, 4.42M, 5.06M, 5.79M, 6.63M, 7.59M, 8.69M, 9.94M, 11.38M, 13.03M, 14.91M, 17.07M, 19.54M, 22.36M, 25.60M, 29.30M, 33.54M, 38.39M, 43.94M, 50.30M, 57.58M, 65.90M, 75.43M, 86.35M, 100.00M, 113.14M, 129.51M, 148.24M, 169.68M, 200.00M
This will be an automated test using the prescribed Fluke 9500B oscilloscope calibrator.
Few of us have such a beast therefore just finding the -3dB BW rolloff is quite sufficient for our needs.
Typical method is set source to 1V p-p and start winding up frequency until the scope displays 0.707V p-p from a 1V sinewave input. Just don't forget it need be done using a 50 Ohm system. ;)
seronday:
The last paragraph on page 38 of the SDS2000X HD service manual describes the method of calculating the dB change in level at each of the measured frequencies, by using the level at 1 MHZ as the reference.
If using a much higher frequency for the reference level, the frequency response may have already started to roll off at that frequency.
Regards.
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