Instek GFC-8270H - Intelligent Counter GFC-8270H (2.7GHz) Frequency, Period measurement Microprocessor controlled intelligent counter High resolution at both high and low frequency 0.01Hz ~ 2.7GHz frequency range 10mVrms High sensitivity 100nHz resolution for 1Hz Self diagnosis routine Variable Trigger Level control Display hold function        Data Sheet User Manual       SPECIFICATIONS       Display 8 digits with Hz, kHz, MHz, GHz, S, mS, µS, nS and overflow       Gate Time Continuously vary from 10mS to 10S, or 1 period of input depending on whichever is greater       Accuracy +(Resolution +Timebase error)       Channel A       Range DC coupled 0.01Hz ~ 120MHz；AC coupled 30Hz ~ 120MHz       Sensitivity 10mVrms typical； 50mVrms max       Coupling AC or DC switchable       Filter Low pass, switchable in or out for channel A.-3dB point of nominally 100kHz       Impedance 1MΩ//40pF       Attenuator x 20dB       Trigger Level Adjustment -2.5 VDC to +2.5 VDC       Resolution The maximum resolution for frequency measurement is 100nHz for 1Hz and 0.1Hz for 100MHz input respectively, and for period measurement is 10nS for 1Hz and 0.1fS (f=10-15) for 100MHz input respectively. At least 7,6,5 digits are display for 1S, 100mS, 10mS gate time respectively       Period Range 8nS to 100S at least 7 digits displayed for per second of gate time       Channel B       Range 50MHz to 2.7GHz       Sensitivity <50mVrms (10mVrms typical)       Coupling AC only       Time Base       Aging Rate 1 ppm, per Month       Temperature 5 ppm 23°C + 5°C       Line Variation +0.005 ppm for +10% variation       Power Source AC 100V/120V/220V/240V ±10%, 50/60Hz       Accessories Instruction manual × 1, Power cord × 1, GTL-101 × 1       Dimensions & Weight 230(W) × 95(H) × 280(D) mm, Approx. 2.2kg