G E N E R A L The F C - 7 5 8 is a m u l t i - f u n c t i o n a l counter. It can be controlled externally w i t h r e a r - p a n e l gate signal or used to measure periods and to count event inputs (event through f r o n t - p a n e l operations.
2. S P E C I F I C A T I O N S [Period Measurement ( A ) ] [Frequency Measurement (Channel A ) ] 0.285/<s to 200 m s ( 5 H z to 3.5 Measurement Range kHz m o d e : 5 H z to 1 0 M H z Measurement Range M H z )
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[ i n p u t Characteristics (Channel A ) J [Reference O s c i l l a t o r ] Frequency Band 5Hz to 1 0 0 M H z ( C o u p l i n g : A C Oscillation Frequency C r y s t a l Oscillation 10.0MHz...
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Counting T i m e 0.01s, 0.1s, 1.0s, 10s ( G a t e t i m e ) Resolution 0.1 Hz to 100 Hz [ G e n e r a l Requirements J Power Supply 100/120/220/240V ± 10%(Max 2 5 0 V ) , 50/60Hz, Voltage 2 0 V A...
PRECAUTIONS FOR USE - T u r n o f f the product and then connect it w i t h the A C d» T h i s counter can s t a r t its operation a t the moment w a l l outlet by using the accessory power cable cord.
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Note t h a t t h i s s w i t c h can work together w i t h because i t s resolution functions better than the channel A only but does not affect channel B. channel A ' s one.
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selected by F U N C switch The following operational modes can be selected In any measurement mode other than the Event w i t h this s w i t c h : Input T o t a l Count operation mode: k H z / 1 0 M H z ( frequency) measurement mode If t h i s s w i t c h is pressed ( J B L ) , the current...
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in which t h i s product counts the number of Note : The m a x i m u m frequency to be handled in channel A input cycles and then outputs each t h i s measurement mode is 100MHz. The proper count value to the display continuously.
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Power supply voltage selector ( L I N E V O L T A G E S E L E C T ) The power supply voltage selector is provided to select the supply voltage t h a t is applied to the counter.
T h i s adjustment applies to both of the C H A 4 - 3 Case Surface ( 1 0 . 0 M H z ) and C H B (3.90625MHz) channels. There is an opening on the case surface to enable The opening is normally covered w i t h a rubber cap.
5. OPERATING PROCEDURES frequency varies depending on the measurement modes. In the kHz measurement mode, up to E v e r y time when you s t a r t using the F C - 7 5 8 M u l t i - 1 0 M H z - f r e q u e n c y can be processed while the Functional Counter, look a t the rear panel and v e r i f y m a x i m u m frequency t h a t can be handled in the...
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measurement, the current measurement value on the it gets too f a s t due to h i g h - f r e q u e n c y signal Display is held a s it is. If pressed again, a new measurement.
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The m a x i m u m input frequency is 1 0 M H z . operation w i l l be started a t the moment. Select the T O T A L / 1 0 M H z (event input t o t a l If the T O T A L I Z E I N P U T S T A R T / S T O P juck is...
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to the C H A N N E L A juck is handled first by the The user has pressed H O L D switch @ ( - i s * . ) . L P F circuit (about 100kHz) and then input to the In this case, the counting measurement is counter.
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Figure 4 shows display examples. changed to 100Hz (0.001 M H z ) . Figure 4 a indicates the value of " 1234.567" w i t h - Figure 4 d shows the typical display example in k H z / ^ s L E D (3) active. T h i s means t h a t the the event t o t a l measurement mode.
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precision d a t a can be displayed. The problems discussed above may be triggered by If relatively h i g h - f r e q u e n c y signal is measured, the standing waves. frequency measurement mode should be used instead In this case, the input circuit should be properly of the period measurement mode because higher terminated or the cable length needs to be adjusted.
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Sn the following paragraphs, the relationship Period measurement mode between measurement modes and measurement The period measurement mode processes the speci- delays w i l l be discussed. fied number of cycles and then outputs the aver- Frequency measurement mode age cycle time.
6 - 2 Change in measurement mode and resolution MEASURING CONSIDERATIONS A new measurement operation is started each time when a measurement mode or resolution value is 6 - 1 Use of attenuator probe changed. The measurement display d a t a on Display The input impedance ( 1 .
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The G A T E L E D remains inactive while the R E S E T Resolution G A T E time switch is being held down. Output display (measuremer value setting The G A T E L E D w i l l resume blinking a t the interval period) moment when the R E S E T s w i t c h is released.
MAINTENANCE Bear in mind t h a t voltage change results requires C A U T I O N a new fuse rating. Be sure to disconnect the power cable f r o m the Case 1 : V o l t a g e change f r o m 1 0 0 V / 2 0 0 V to 2 2 0 V / socket, before conducting the following operation.
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A p r o d u c t of K E N W O O D C O R P O R A T I O N 2-5, 1 -chome Shibuya, Shibuya-ku, Tokyo 1 50, Japan...