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European distributor for Kenwood & Tecstar test and measurement, PrismSound audio analysers.

 
Frequency counter
FC-758A
 

Outline
The FC-758A is a multi-function frequency counter providing measurement functions of frequency， period， period average， and addition accumlation. As a display， it used an 8-digit LED. Its display resolution is 10 Hz for up to 2.4 GHz， 1 Hz for up to 100 MHz and 0.1 Hz for up to 10 MHz. For period measurements， the period can be measured between 5 Hz and 25 MHz in micro-second order (unit of ｵsec.). For lower frequencies， period measurement is obtained at a higher accuracy than that of normal frequency measurement. Addition measurement is also possible for counting the number of phenomena which occur. A gate controll is also possible for the counting measurement for manual or external control to a higher degree of precision. In the display area， red LEDs are adopted to indicate various information with the automatic decimal position setting， zero blanking， measurement unit， over-flow， and with 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 AC power source， etc.

 
Features
●2.4 GHz Wide Bandwidth Design
The FC-758A features a wide bandwidth of 2.4 GHz; the top level in this class.

●Low-Pass Filter Provided
Low-pass filter having the attenuation characteristics of -3 dB at 100 kHz is provided for reducing RF noise. It assures minimized mis-counting. (CH-A only)

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

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

●Addition Counting Function
Not only with manual operation using the front panel controls, but also it enables to start and stop counting for external signal.

●4-Step Gate Time Setting and Automatic Decimal Position Selection
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 value will not be displayed.

●Over Flow Indication
LED lights when the measurement value exceeds the displayed digits in order 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-758A with the best-viewing angle.

●Pulse Width Measurement
Allows measurement of the pulse width up to 2 MHz (0.25 ｵs).

●SPECIFICATIONS
 

SPECIFICATIONS
Frequency Measurement (ch A)
Measurement Range/Unit kHz mode : 5 Hz -- 10 MHz/kHz
MHz mode : 5 Hz -- 100 MHz/kHz
Accuracy ｱ Reference time accuracy ｱ 1 count
Gate Time 0.01 s 0.1 s 1 s 10 s
Frequency Measurement (ch B)
Measurement Range/Unit 80 MHz - 2400 MHz (2.4 GHz)/MHz
Accuracy ｱ Reference time accuracy ｱ 1 count
Gate Time 0.032 s 0.32 s 3.2 s 32 s
Period Measurement (A)  
Measurement Range 0.04 ｵs - 200 ms (5 Hz -- 25 MHz)
Accuracy ｱ 1 count ｱ reference time accuracy 
ｱ trigger error
Resolution 10 ps -- 100 ns
Unit ｵsec.
Minimum Pulse Width 0.04 ｵs
Magnification ﾗ 1 ﾗ 10 ﾗ 100 ﾗ 1000
Pulse Width Measurement (ch A)
Measurement Range 0.25 ｵs -- 200 ms (5 Hz -- 2 MHz)
Resolution 100 ps -- 100 ns
Accuracy ｱ 1 count ｱ reference time accuracy 
ｱ trigger error ｱ N
Minimum Pulse Width 250 ｵs
Unit ｵs.
Magnification ﾗ 1 ﾗ 10 ﾗ 100 ﾗ 1000
Single Phenomenon Standby mode by resetting
Addition Counter Measurement (A)
Counting Capacity 0 - 99999999
Measurement Range 5 Hz - 10 MHz
Control Reset/Hold possible from front panel. Always ON except when Start/Stop on the rear panel is set to LOW level.
Input Characteristics (ch A)
Frequency Bandwidth 5 Hz - 100 MHz AC coupling
Sensitivity (Sine Wave) kHz Freq. : 20 mVrms (5 Hz - 10 MHz)
MHz Freq. : 20 mVrms (5 MHz - 30 MHz)
50 mVrms (30 MHz -- 100 MHz)
Input Impedance 1 MW 40 pF or less
Max. Input Voltage 42 V (DC AC peak)
Attenuator ﾗ 1 (1/1) ﾗ 10 (1/10)
Low-Pass Filter 100 kHz -3 dB
Input Characteristics (ch B)
Frequency Bandwidth 80 MHz -- 2.4 GHz AC coupling
Sensitivity (Sine Wave) 5 mVrms (80 MHz -- 600 MHz)
15 mVrms (600 MHz -- 900 MHz)
35 mVrms (1.0 GHz -- 2.4 GHz)
Input Impedance 50W
Max. Input Voltage 1 Vrms
Reference Oscillator
Oscillating Frequency (ch A B) 10 MHz 1ﾗ 10-6 / 23 ｱ 5ｰC
Stability (ch A B) 1 ﾗ 10-6 / 0 to 40ｰC (23ｰC as a reference)
1 ﾗ 10-6 / year
Display
Display 8 digits LED (7-segment)
kHz/ｵs MHz GATE OVER FLOW
Function Display FREQ A FREQ B PEIOD A
PULSE A TOTAL CHECK
Counting Time CH A: 0.01 s 0.1 s 1.0 s 10 s
CH B: 0.032s 0.32 s 3.2s 32 s
Self Check
Display Counting time base (Internal 10MHz)
Gate Time/Resolution 0.01 s 0.1 s 1.0s 10s / 0.1 Hz - 100 Hz
Environmental Condition
Storage Temperature/Humidity -20ｰC to 60ｰC 70% or less
Operation Temperature/Humidity 0ｰC to 40ｰC 80% or less
Specification Guarantee Temperature/Humidity 23ｰC ｱ 5ｰC 70% or less
Others
Power Requirements/Power Consumption AC 100/120/220/230 V ｱ 10%
50/60 Hz / Approx. 20 VA
Dimensions (W ﾗ H ﾗ D)  240 ﾗ 64 ﾗ 190 mm
(260 ﾗ 70 ﾗ 210 mm, maximum dimensions)
Weight  1.8 kg
Accessories Instruction Manual (1) Power Cable (1)
Applicable Standard
EMI EN55011 (1991) Class B
EMS IEC801-2 (1991) 8kVAD, IEC801-3 (1984) 3 V/m, IEC801-4 (1998) 1 kV, 
5/50 ｵs, 5 kHz


 

 

 

 

 

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Last modified: 10-09-04