Test and Measurement Forum

Can you clarify maximum input voltage (AC). It appears that the maximum normal operating voltage range is + or - 20V with the input protected at 100V. If our probe is 10 to 1 that would be 40 V at device input with 400V at the measurement point.


PicoScope 3424 Oscilloscope Specifications
Oscilloscope
Bandwidth 10 MHz
Channels 4
Vertical resolution 12 bits
Enhanced vertical resolution
16 bits
Dynamic range 72 dB
Accuracy 1%
Input ranges (full scale) ±20 mV to ±20 V in 10 ranges
Input characteristics 1 MΩ in parallel with 20 pF
Input type Single-ended, BNC connector
Input coupling Software selectable AC/DC
Overload protection ±100 V on single input
Maximum sampling rate (single shot)
One channel in use
Two channels in use
Three or four channels in use
20 MS/s
10 MS/s
5 MS/s
Maximum sampling rate
(continuous streaming mode)
1 MS/s (Record length limited to 2 MS in PicoScope, unlimited when using the supplied API)
Buffer memory 512 kS
Buffer memory (in streaming mode) 2 M samples per channel
Waveform buffer
Up to 1000 waveforms
Timebase ranges 500 ns/div to 50 s/div in 25 ranges
Timebase accuracy 100 ppm

Thank You

On the 3424, the maximum readable DC or peak AC direct input is +/- 20Volts . The scope is protected to +/-100V.
With a 10:1 probe, the readable input rises to +/-200V and the maximum voltage is +/-600V (the probe rating). An AC signal of +/-200V (peak to peak) equates to about 141V AC. This does not mean it is legal to measure 120V AC mains voltages, only AC voltages isolated from direct mains connection by an isolating transformer since the earth lead of the probe is held at PC ground.
Regards,
PeterF.