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| MrW0lf:
PicoScope 2408B (100MHz, 4CH, 1GSa/s RTS, 20GSa/s ETS, 128MB memory, AWG) USB oscilloscope rolling review + general 2000 series thread Even as a long time PicoScope owner (2205 (2010my), 2205 MSO (2013my)), was quite surprised by my new 2408B on several fronts. So decided to do "rolling review" on it and learn how to properly max out it's capabilities in progress. Currently planned: bandwidth & sampling rate limits; vertical / horizontal / automated measurements accuracy; advanced mask testing; FFT; decoding; bode plot (incl. phase), some math trickery. If any additional interests, please ask.. First task/test was to actually find out specs. Included here are those I see as most important and ones missing / different in official specs (emphasized in green). Scope performance relies heavily on PC software - so guess they forgot to update specs, while software got better. PC itself also plays large part, mine is Lenovo W520 laptop, Intel i7-2720QM, 8GB RAM, 64-bit Windows 7. So reasonably fast, but probably not enough to totally max out scope. Disclaimer: review/test is done in non-controlled environment by non-professional. Use this info at own risk & responsibility :) 2408B SPECIFICATIONS Oscilloscope - vertical Analog bandwidth: 100MHz Rise time (calculated): 3.5ns Vertical resolution: 8bit (up to 12bit averaging) Input coupling: AC/DC Input ranges: +-20mV...+-20V (4mV/div...4V/div) Vertical DC offset range: ±250mV (±20mV to ±200mV ranges); ±2.5V (±500mV to ±2V ranges); ±25V (±5V to ±20V ranges) DC zero level calibration: on-the-fly DC accuracy: ±3% of full scale ±200uV Offset control accuracy: ±1% of offset setting, additional to basic DC accuracy Overvoltage protection: ±100V (DC + AC peak) Oscilloscope - horizontal Real time sampling rate (RTS): any 1 ch 1GSa/s; any 2 ch 500MSa/s; any 3-4 ch 250MSa/s Equivalent time sampling rate (ETS): any 1-4 ch 20GSa/s Timebases (RTS): 1ns/div...5000s/div Timebases (ETS): 50ps/div...200s/div Max timebase at max sampling rate (RTS, Single trigger, fast sampling): 10ms/div Max timebase at max sampling rate (RTS, None|Auto|Repeat triggers, fast sampling): 5ms/div Max timebase at max sampling rate (RTS, Rapid trigger, fast sampling): 1ms/div Max timebase at max sampling rate (ETS): 50ns/div Max memory (RTS, Single trigger, fast sampling): any 1ch 1x120MB; any 2ch 2x60MB; any 3ch 3x30MB; 4ch 4x30MB Max memory (RTS, None|Auto|Repeat triggers, fast sampling): any 1ch 1x60MB; any 2ch 2x30MB; any 3ch 3x15MB; 4ch 4x15MB Max memory (RTS, Rapid trigger, fast sampling): any 1ch 1x13x9.5MB; any 2ch 2x13x4.75MB; any 3ch 3x13x2.375MB; 4ch 4x13x2.375MB Max memory (RTS, None|Auto|Repeat|Single triggers, slow sampling): any 1ch 1x95MB; any 2ch 2x48MB; any 3ch 3x32MB; 4ch 4x24MB Max memory (ETS): any 1-4ch 1-4x16,380kB Waveform buffers: 10,000 Maximum waveforms per second (RTS, persistence mode): 80,000 Maximum waveforms per second (RTS, Rapid trigger): >1,000,000 Initial timebase accuracy: ±50ppm Timebase drift: ±5ppm / year Sample jitter: 3ps RMS typical ADC sampling: Simultaneous Dynamic performance Crosstalk (full bandwidth, equal ranges): Better than 300:1 Harmonic distortion: <–50dB at 100kHz, full-scale input, typical SFDR (100 kHz, full-scale input, typical): ±20mV range: >44 dB; ±50mV range and higher: >52 dB Noise: <30uV RMS (±20mV range) Bandwidth flatness: (+0.3dB, –3dB) from DC to full bandwidth Triggering Trigger rearm time in rapid trigger mode: <1us on fastest timebase Max. waveforms in rapid trigger mode: 10,000 Function generator Standard signal frequency: 1MHz AWG update rate: 20MHz AWG buffer: 32kB AWG Resolution: 12bit AWG bandwidth: >1MHz AWG rise time (10%...90%): <120ns Spectrum analyzer Frequency: 0...100MHz FFT points: 1M FFT channels: all physical channels * viewports (same physical channel may be in different viewports, zoomed in different way) * math channels = many Mask testing Modes: YT, XY, FFT Mask channels: estimated (12 viewports * 4 ch) = 48 masks simultaneous Automatic measurements Accuracy: 4-digit rounded at UI level, internally high precision floating point (can be accessed using "hacking") Display Interpolation: Linear or sin(x)/x Persistence modes: Digital color, analog intensity, custom, fast or none Zoom: 100Mx horizontal, 50x vertical in any timebase + offset + custom zoom Connections 4xCH BNC; AWG; USB 2.0 Serial decoding (1-Wire, ARINC 429, CAN, CAN FD, DCC, DMX512, Ethernet 10Base-T, FlexRay, I²C, I²S, LIN, PS/2, SENT Fast, SENT Slow, SPI, UART/RS-232/RS-422/RS-485, USB (1.0/1.1)) Other features math channels; event actions; supplied probes: 4xTA132 (1x/10x, 150MHz) incl. BNC adaptors ANALOG BANDWIDTH TEST VERTICAL SYSTEM INTEGRITY TEST DC ACCURACY FREQUENCY COUNTING ACCURACY MICROPHONICS CUSTOM PROBES DIGITIZING ANALOG SIGNALS USING TRIGONOMETRY DADC / VIRTUAL MSO USING EXTERNAL DAC FREQUENCY RESPONSE ANALYSIS TOOLS |
| JPortici:
It's dependent on usb load and on cpu/software load! notice that if you enable one or more decoders / math channels the waveform update rate drops down. **** **** this, on the older pico with 48ks of memory. Probably on the new one it's using the additional memory for buffering and more wfms are transferred during CPU dead time? i don't know. thinking loud. +1 for math trickery |
| MrW0lf:
PicoScope 2408B ANALOG BANDWIDTH Officially it is 100MHz, 3.5ns rise. Bandwidth flatness (+0.3 dB, –3 dB) from DC to full bandwidth. To test did set scope to 20ns/div, +-500mV (100mV/div), 1GSa/s RTS. Used good RF cables with 50ohm pass-thru (supplied probes were not tested). First tried with sine wave from Siglent SDG2000X. Generator seems to drop ~-0.5dB@100MHz. Arrived at conclusion that scope drops <2dB@100MHz. After that tried square from RF Explorer RFE6GEN. Gen is good to 6GHz. Outputs square wave. There should be no amplitude drop in 30...350MHz range. Could not choose ideal amplitude for scope vertical range due to fixed amplitude steps of generator. It is 592mVpp, so 59.2% of scope full range. Compiled chart from both tests: Since sine vs square results where quite different decided to go for classic BW(GHz)=0.35/RT[nsec] formula, set scope to 20GSa/s ETS: 0.35/2.521~=0.139 => Scope analog bandwidth is ~140MHz. ...but triggering system and auto-measurements work to at least 350Mhz. |
| MrW0lf:
PicoScope 2408B VERTICAL INTEGRITY Signal generator: Siglent SDG2000X Signal: sine wave, 100MHz Scope horiz. setting: 50ns/div 50 ohm system. Generator amplitude drop at 100MHz is ~-0.5dB + drop due to scope analog bw limits. 1000x stats averaging applied. Tested: +-20mV...+-200mV ranges (4mV/div...40mV/div); ETS 20GSa/s, RTS 1GSa/s & 500MSa/s & 250MSa/s; Sin(x)/x ON|OFF for RTS (ETS does not support/need Sin(x)/x) Most boring test I've ever done. Amplitude error with sine seems to stay below ~5% across all modes. At 250MSa/s it's of course quite wobbly visually, but this does not bother stats reading. Over time sample points pile up and give correct reading. |
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