Both analog inputs (CH1 and CH2) are protected against over-voltages up to ± 50 V. Input coupling selection is available (DC, AC, GND) and is controlled through software. Input signals can be adjusted for gain and offset to allow measurements of voltages from 100 mV to 20 V (full scale) which gives a minimum input resolution of 0.098 mV. Each analog channel is sampled at 250 MSPS with 10-bit analog-to-digital converter (ADC). Two ADC’s can be configured for sampling in interleaved mode which provides a single channel sampling speed of 500 MSPS. Oscilloscope also supports Equivalent Time Sampling (ETS) which provides a sampling speed of 2.0 GSPS for repetitive signals.
Oscilloscope was set to capture 10k samples at 250 MSPS. We measured both RMS-AC and peak-to-peak voltage values for every frame. The final result is an average value of several consecutive captured frames:
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@@ -32,7 +36,7 @@ Oscilloscope was set to capture 10k samples at 250 MSPS. We measured both RMS-AC
**How to reduce noise**
While the level of internal noise is relatively low, it can be lowered even further with some post-processing of captured samples. A simple moving average filter is implemented in the FPGA which can be enabled via software to reduce noise.
While the level of internal noise is relatively low, it can be lowered even further with some post-processing of captured samples. A simple moving average filter is implemented in the FPGA which can be enabled to reduce noise.
