. 0.1~100MHz, Universal function 2. Frequency measuring range : 0.1Hz to 150MHz in A, B input 3. Trigger level adjustment for input A 4. Separate and common mode selectable for input A and B 5. Period / Total measurement for input A 6. Time interval and ratio measurement for input A and B 7. Slope mode selectable for input A and B 8. 9 digit display with 0.01mHz resolution in 1 sec. 9. High sensitivity external reference input function (higher than 20mVrms) 10. Microprocessor controlledl Reciprocal technique for high resolution at low counting frequency 11. Self check function executed to perform an automatic self diagnosis of various counter function 12. Push-scanning for selecting function and gate time 13. Low-pass filter(100kHz, -3dB) installed for removing noise signal in low frequency measuring 14. AC/DC coupling function (selectable X1 / X10 attenuator) 15. Data hold function 16. Optional RS-232C serial interface function for communication with computer FREQUENCY MEASUREMENT - Display : 9 digit large green LED display(Overflow, gate time, mHz, Hz, kHz, MHz, ns, μs, s, hold)- Range : 0.1Hz ~ 100MHz- Gate time : 0.01s, 0.1s, 1s, 10s- Resolution : 1nH ~ 10Hz- Accuracy : ± resolution ± time base ± 1 count INPUT CHARACTERISTICS - Terminal : A, B- Sensitivity : 20mVrms A, B input / 30mVrms C input- Impedance : 1M? < 40pF A, B input / 50? C input- Max. voltage : 250Vrms A, B input / 3Vrms C input- Attenuator : X 1, X 10 A, B input- Slope A, B : + or ? selectable- Trigger A : preset or variable- Low pass filter : 100kHz(-3dB) A, B input Multi Funtion - Period : 10ms ~ 10s range with 1ps ~ 1ns resolution / ± resolution ± trigger error ± 1 count accuracy- Totalize : 5Hz ~ 30MHz range / 0 ~ 999999999(Max)- RPM : 6 ~ 900 X 106 RPM COMPARISON FUNCTION FOR INPUT A, B - Time interval (A → B) : 1μs ~10s range / 100ns LSD display / ± LSD ± trigger error resolution / - accuracy : ± LSD ± trigger error ± time base error X time interval / 1, 10, 100, 1000 multiplier- Ratio (A/B) : 0.1Hz ~ 10MHz A input range, 0.1Hz ~ 10MHz B input range / ± LSD ±(trigger error X frequency A)/N resolution / accuracy : ± 1count of A ± B trigger error ± frequency A TIME BASECHARACTERISTIC - Internal time base : 10MHz TCO frequency, 3 X 10-7/ month, under 5 X 10-6 (0 + 50℃) temperature stability, under 1 X 10-;7for 10% variation line voltage- Frequency output : 10MHz frequency / 2.5Vp-p amplitude / 500 impedance- External input : 10MHz frequency / 20mVrms ~ 5Vrms input level / 500? impedance GENERAL - Operating environments : 0℃ ~ 50℃- Range for guaranteed : 25℃± 5℃- Power requirement : AC 115 / 230V ± 10%, 50/60Hz- Dimension : 255mm(W) X 80mm(H) X 260mm(D)- Accessories : power cord, fuse, operation manual, BNC cable- Factory optional selection : RS-232C interface / TCXO