Máy đếm tần số GWInstek GFC-8270H

DISPLAY   8 digits with Hz, kHz, MHz, GHz, s, ms, μs, and overflow GATE TIME   Variable from 10ms to 10s, or 1 period of input depending on whichever is greater ACCURACY   ±(resolution ± timebase error) CHANNEL A Range DC coupling: 0.01Hz ~ 120MHz  AC coupling: 30Hz ~ 120MHz Sensitivity 10mV typical, 50mV maximum Coupling AC or DC, selectable Filter Low pass, selectable in or out for channel A  (-3dB point, nominal 100kHz) Impedance 1MΩ // 40pF Attenuator 1/1 or 1/20dB Trigger Level -2.5VDC ~ +2.5VDC Adjustment Resolution –      For frequency measurement, the maximum resolution is 100nHz for 1Hz and 0.1Hz for 100MHz inputs respectively. –      For period measurement, the maximum resolution is 10ns for 1Hz input, and 0.1×10-15s for 100MHz inputs respectively. Display Accuracy 7 digits for 1 sec gate time  6 digits for 100ms gate time  5 digits for 10ms gate time Period Range 8ns ~ 100ns (at least 7 digits displayed per gate time) CHANNEL B Range 50MHz ~ 2.7GHz for GFC-8270H Sensitivity