The FC-757A is a universal counter mounting measurement functions of frequency, period, period average, time interval, frequency ratio and addition accumlation. As a display, it employs an 8-digit LED. Its display resolution is 1 Hz in MHz range measurement and 0.1 Hz in kHz range measurement. For period measurement, the period required for 1 cycle can be measured between 5 Hz and 2 MHz (with a unit of ìsec. or msec.). For lower frequencies, period measurement is obtained at a higher degree of accuracy than that of frequency measurement. The frequency ratio measurement is effective in comparing two frequencies (as comparison between clock pulses on the digital circuits) and to obtain the ratio between them. Addition measurements are also possible for counting the number of phenomena occured. A gate controll is also possible for the manual or external control of the counting operation to a higher degree of precision. In the display area, red LEDs are adopted to indicate various information with an automatic decimal position setting, zero blanking, measurement unit, over flow, and gate status since a high-stability 10 MHz crystal oscillator is employed, the FC-758A assures an extraordinary stability against temperature change or fluctuation of power source, etc.

Variety of Measurement Items
Not only for frequency and period, the time inter val or frequency ratio between two signals are also measured as well as an addition counter and other measurement functions.

Low-Pass Filter Provided
A low-pass filter having the attenuation characteristics of -3 dB at 10 kHz is provided for to reduce an RF noise. It assures minimized mis-counting. (CH-A only)

Attenuator Provided
A -20 dB attenuator is provided to reduce the mis-counting which could occur due to an excessive input. (CH-A only)

Data Hold Function
This function hold display values by temporarily interrupting the measurement.

Addition Counting Function
Not only a manual operation using the front panel controls available, but to start and stop control from external signal is also enabled.

4-Step Gate Time Setting and Automatic Decimal Position Select
Since the gate time and the decimal point of the measured values are interlocked, the measurement is made possible with the most appropriate resolution.

Zero Blanking
Zeroes "0" at the digits above the display of the effective values will not be displayed.

Over Flow Indicator
LED lights when the measurement value exceeds the displayed digits to prevent mis-counting.

Combination Tilt Stand/Carrying Handle
The carrying handle can be used as a tilt stand as it is for mounting the FC-757A with the best-viewing angle.

External Reference Frequency Input Terminal Provided
When more accurate measurement is required, a higher precision reference frequency generated by external equipment can be input for the improvement of reference time accuracy