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limitations.md

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Valid specs for the 6022BE/BL with custom firmware by Ho-Ro.

  • The device has no internal storage (except for a small fifo buffer), all data is streamed in real time as USB bulk transfer.
  • Supports 48, 30, 24, 16, 15, 12, 10, 8, 6, 5, 4, 3, 2, 1 MS/s and 500, 400, 200, 100, 64, 50, 40, 20 kS/s samplerates.
  • Due to the USB bandwidth constraints the max usable samplerate is limited: Max 30 MS/s for CH1 only and max 15 MS/s for CH1+CH2 and also CH2 only - otherwise data overrun occurs.
  • Under Linux (even better if using a realtime kernel) the priority of the program can be raised when the user is member of a realtime group, e.g. audio:
1. set limits in /etc/security/limits.d:
   @audio - rtprio 99
2. add user to the group, e.g. audio:
   usermod -a -G audio <your_user_name>
or set the limits only for your user in /etc/security/limits.d:
   <your_user_name> - rtprio 99
  • The scope program works with blocks of 20000 samples - either 8 bit samples for CH1 only or 16 bit samples otherwise.
  • Two analog input channels with 8-bit sample-width, max input voltage range is -5 V..+5 V, values outside this range are clipped (shown as minimum or maximum value).
  • For low effective sampling rates < 1 MS/s a 10X..200X oversampling is used to increase the signal-to-noise ratio by 10..20 dB and to get a better voltage resolution (up to > 11 effective bits). The oversampling allows also low effective samplerates down to 100 S/s for a slow display range of 10s/div.
  • The first samples are unstable (due to the use of the ADC far outside the common mode voltage specifications) -> take about 2000 additional values to settle the ADC and drop the first samples.
  • No AC coupling available, all signals are measured as DC. (Use either a BNC DC-block or the math mode "CHx AC").
  • A little HW modification adds AC coupling. OpenHantek6022 supports this feature since v2.17-rc5 / FW0204.
  • No HW trigger available, SW trigger searches for trigger condition and positions the trace window accordingly.
  • Can detect rising or falling edge (also alternating from trace to trace) of the signal, displayed trigger position can be at 0..100% of screen width.