SPECIFICATIONS Differential Voltage DC + pk AC:6500VBandwidth ( 50 Ω load -3dB ):100MHz( x100 50MHz)Common Mode Voltage DC + pk AC:6500VCommon Mode Voltage RMS CAT II:6500VCommon Mode Voltage RMS CAT III:6500VAttenuation ( Switchable ):X 100, X 200, X 500, X 1000Input R ( Each input ):27MΩ ± 1%Input C ( Each input ):2.5 PF ± 2%Maximum Operation Voltage( DC + pk AC ) ≦ ± 650V at X 100 ≦ ± 1300V at X 200 ≦ ± 3250V at X 500 ≦ ± 6500V at X 1000Common Mode Rejection Ration ( C M R R ) 60 Hz : > 20,000 : 1 100 Hz : > 2,000 : 1 1 MHz : > 600 : 1Noise ( Into 50Ω load ):≦ 1 m VrmsInput Impedance ( between input):54 MΩ // 1.25 PFAccuracy ( at 20 ~ 30℃ 70% RH after 20 minutes ):≦ ± 1.5%