... analyzed:(AC+DC) measuring synchronous,(AC+Hz) measuring synchronous,(DC+dBm) measuring synchronous,(dBm+Hz) measuring synchronous,(Hz+Duty) measuring synchronous,(°C+°F) displaying synchronous;7, ... Input Impedance10MΩSampling frequency4times/sec. Analog bar40 times/sec.AC frequency response40Hz-50kHzOperation wayAuto rangeMax display80000Computer interfacephotoelectricity insulation RS- ...