Voltage: 220V/110V±10% 50/60Hz Measurement range: Voltage :300μV-100V dB-70dB to +40dB dBm:-80 to dBm (0dB=1Vrms, 0dBm=0.755V) Error: full scale <3% 1KHZ level Frequency response: 5HZ-1mhz: 10%; 10HZ-500khz: 5% 20Hz to 200KHz: SM3% 30Hz to 100KHz: SM2% Level 1 KHZ Input impedance: 10 mω ±5%, 45pF Maximum input voltage: 500V(DC+AC):3 volts -100V range 300V(DC+AC): range of 300 microvolts to 1 volts Stability: ±5% full scale Residual voltage: less than 200μV 1mV level, short circuit output Gain: 60 db Output voltage: 0.1Vms±20% full scale (no load) Output resistance: 600Ω 20% 1KHz level Distortion: less than 1% full scale SNR: 30dB larger in the range of 0.3mV Frequency response: 5Hz ~ 500KHz: Shi <3% Rated operating temperature/humidity: 10 °C ~ 40°C/85%RH Weight: 3 kg Size: 239 * 140 * 200 mm