Products > Test Equipment
New Rigol DS1054Z oscilloscope
TurboTom:
David -
your assumption regarding the input amplifier getting close to saturation at higher input levels (or encountering problems because of its limited slew rate) sounds reasonable, but it doesn't actually appear to be the case. I just re-checked the bandwidth in the high sensitivity range of my DS1000Z at a setting of 5mV/div with an input signal level of round about 40mVpp.
If your assumption would be correct, I'ld expect a noticably higher bandwidth than with the scope set at 330mV/div, just before the relay switches in the additional analog divider, and fed with an input signal of 1.5Vpp (that's the maximum my SDG6000X will provide with the additional 50 ohms terminator at up to 350MHz). Actually, the bandwidth even appears to be a little higher at the higher input level.
The big difference is when the input sensitivity is changed to 335mV, enabling the divider. Risking to be boring, may I ask to please have a look at the attached screenshots, their file names should pretty well explain what you're seeing there (LR = Low Range, HR = High Range of the relay-operated input divider). I checked the output level of the SDG6000X to be constant within 0.1dB over the frequency range (HP437B + HP8482A).
Actually, I've got the impression that Rigol over-compensated the parasitic capacitances of the additional voltage divider in the high input range, thus emphasizing the high frequencies and causing the HF rolloff to appear slower than it actually is. It will be quite difficult to check this in an open DS1000Z frontend since any probing in this area will affect the performance of the circuitry. It's probably enough to know about this issue and keep it in mind when using the scope. Anyway, the owners buy a 50MHz scope, convince it to believe it's a 100MHz version and then want to use it up to 150+MHz? Sounds weird... ;)
Cheers,
Thomas
Karel:
--- Quote from: TurboTom on August 05, 2019, 01:43:05 pm ---Anyway, the owners buy a 50MHz scope, convince it to believe it's a 100MHz version and then want to use it up to 150+MHz? Sounds weird... ;)
--- End quote ---
Don't you think the DS1054Z and the DS1104Z share the same hardware and that, by using a software key the artificially limited bandwidth can be upgraded?
ebastler:
--- Quote from: Karel on August 05, 2019, 03:23:03 pm ---
--- Quote from: TurboTom on August 05, 2019, 01:43:05 pm ---Anyway, the owners buy a 50MHz scope, convince it to believe it's a 100MHz version and then want to use it up to 150+MHz? Sounds weird... ;)
--- End quote ---
Don't you think the DS1054Z and the DS1104Z share the same hardware and that, by using a software key the artificially limited bandwidth can be upgraded?
--- End quote ---
I understood TurboTom's comment as just stating that us DS1054Z owners are a greedy bunch. ;)
Buy 50 MHz, cheat your way into 100 MHz, then hope to get 150 MHz and beyond... 8)
tv84:
--- Quote from: ebastler on August 05, 2019, 04:26:13 pm ---I understood TurboTom's comment as just stating that us DS1054Z owners are a greedy bunch. ;)
Buy 50 MHz, cheat your way into 100 MHz, then hope to get 150 MHz and beyond... 8)
--- End quote ---
Not "hope", "expect". ;)
bd139:
Indeed. That is my biggest expectation for the MSO5000 is something proportionately for nothing :)
I wish they’d hurry up and fix the bugs
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