Scanning low distortion sine wave digital display voltmeter and frequency meter ※ ※ logarithmic sweep to learn, easy to use ※ built-in amplifier and the output protection circuit ※ voltage values ??are coarse and fine adjustment knob set excellent reliability ※ ※ Fo value can be manually tested, the frequency can also fine-tune the technical parameters of the frequency range of 20Hz ~ 20 kHz frequency error ≦ ± 0.25dB, 20Hz ~ 20 kHz. Scan mode manually, automatically logarithmic sweep sine wave distortion ≦ 0.15%, (20Hz ~ 20 . kHz) the sweep time of 0.3 to 40 seconds adjustable frequency meter 4 digit display resolution of 1 Hz accuracy of ± 1 Hz ≧ 2 Ω load impedance digital voltmeter 3, Auto Range Low Range:...? 0.000v ~ 3.300v Resolution: 0.001v High Range: 3.300v ~ 40.00v Resolution:. 0.01v accuracy:. ± 0.6% output voltage adjustment range 8 Ohms load: 7116C (20W) 0 ~ 12.6 V 7116C (60W) 0 ~ 22.0 V 7116C (100W) 0 ~ 28.3 V 7116C (200W) 0 ~ 40.0 V 4 Ohms load: 7116C (20W) 0 ~ 9.0 V 7116C (60W) 0 ~ 15.5 V 7116C (100W) 0 ~ 20 V 7116C (200W) 0 ~ 28.3 V