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User's Guide 

 

 

 

 

 

 

 

Frequency Counter 
 

Model 381235 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Introduction  

Congratulations on your purchase of Extech’s Frequency Counter. This meter will measure 

frequency to 2.5GHz using test leads or the optional RF antenna. This professional meter, 

with proper care, will provide years of safe reliable service. 

Содержание 381235

Страница 1: ...ntroduction Congratulations on your purchase of Extech s Frequency Counter This meter will measure frequency to 2 5GHz using test leads or the optional RF antenna This professional meter with proper care will provide years of safe reliable service ...

Страница 2: ...MHz Period range Resolution and sampling rate specifications Range Gate time selection Resolution Hz Sampling time sec FAST 1000 0 5 SLOW 100 2 75 SLOW select 1 200 1 5 2500MHz SLOW select 2 500 0 75 FAST 100 0 75 SLOW 10 6 SLOW select 1 20 5 500MHz SLOW select 2 50 1 5 FAST 10 0 5 SLOW 1 1 25 SLOW select 1 0 2 6 10MHz SLOW select 2 0 1 11 NOTE In SLOW Gate Time mode Gate switch set to SLOW pressi...

Страница 3: ...ress the Power OFF key 2 Slide the Range selector switch to desired measurement range Note that for the best accuracy and resolution be sure to use the most appropriate range 3 Apply the measurement signal to the input Channel A socket if the frequency of the signal is between 500MHz and 2500MHz 4 Apply the measurement signal to the input Channel B socket if the frequency of the signal is between ...

Страница 4: ...n alternately The 2nd CALL key press shows the minimum reading and the Lo icon alternately The 3rd CALL key press shows the average reading and the A icon alternately The Average reading will continue to update every 10 samples To return to normal operation press the RECORD key again Period Measurements Input the signal to Ch C Slide the Range selector switch to the PERIOD position Period measurem...

Страница 5: ...nsors and cables If it should become necessary to return the instrument for service during or beyond the warranty period contact the Customer Service Department at 781 890 7440 for authorization A Return Authorization RA number must be issued before any product is returned to Extech The sender is responsible for shipping charges freight insurance and proper packaging to prevent damage in transit T...

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