Que đo vi sai Pintek DP-25 ( 1.3KVp-p / 25MHz Econ

Band width (-3dB, 50Ω load): DC-25MHz . ( x 20: DC~15MHz)
Accuracy : ± 2% at 20-30℃ 70% RH after 20 minutes warm up.
Attenuation : x 20, x 50, x 200 ( Into 1MΩ scope ) ; x 40, x 10
, x 400 ( Into 50Ω load )
Maximum operation Voltage ( DC + peak AC ) :
≦ ± 140V at x 20
≦ ± 350V at x 50 
≦ ± 1300V at x 200
Maximum input Differential Voltage : 1300V ( DC + peak AC ) or 1000V RMS
Maximum input Voltage to Ground : 1000V ( DC + peak AC ) or 600V RMS
Common Mode Rejection Ratio ( CMRR ):
60Hz : >10,000 : 1 
100Hz: >1,000 : 1
1MHz: > 300 : 1
Noise :≦ 2 mV rms ( Into 50Ω load )
Input Impedance :
2MΩ, 2.3 PF between inputs and ground.
4MΩ, 1.2 PF between inputs. 
Power : external 6V-9V DC.