Unisource FC-8300 3.7GHz Frequency Counter Unisource FC-8300 3.7GHz Frequency Counter × Rotation Per Minute Measuring Function External Frequency Standard Input with 9 Digits LED Display Attenuator Check Period Line Filter Low Pass Filter This reciprocal UNIVERSAL (FREQUENCY) COUNTER series are microprocessor controlled instrument for frequency measurement at high resolution within a short period of 7 digit display with one second gate time due to uniquely developed LSI as well as the expanding/reciprocal system. It covers a frequency range from 0.1Hz to 3.7 GHz based on 10MHz time base T.C.O (temperature controlled oscillator). A self-test mode is also provided for a quick check of several facets of operation. Each operating mode can be selected by front panel push button switches with automatic decimal points and indicators. The high accuracy, sensitivity and versatility of this counter make it an extremely valuable instrument to the scientist, engineer, experimenter and communications technician. Light weight and compact size make it practical for use by the hobbyist or field technicians. Front Panel FRONT PANEL (1) GATE INDICATOR : The gate light, when lit, indicates the main gate is open and measurement in progress. (2) RS-232C INDICATOR : TX(transmitting), RX(receiving) blinking(OPTION) (3) OVER FLOW INDICATOR : OF is displayed when overflow. (4) DISPLAY : 9 digit(O.56) green LED display used for all read readings. 5) UNIT INDICATOR : When lit, indicates that the frequency displayed is in KHz or MHz, and period is in n, u or mSec. (6) HOLD INDICATOR : When lit, engaged the hold function. (8) INPUT C, BNC : Input for frequency measurements above 80MHz Female BNC connector terminated in 50Ω. (9) LOW PASS FILTER : With this switch pushed in, the input A is routed through a low-pass filter with a -3 dB point of approximately 100 KHz
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