En Frekvenstæller skal man også bruge ellers er man lorst hvis man vil bygge selv, jeg har købt der her.

 

 

 

Section one: General description

I Introduction

This instrument is one of multifunctional and hi-precision frequency conters that measures frequency from 10Hz to 2700MHz

It features eight digits, bright seven segment LED display, four function performance. Low power consumption circuit design, small size,light weitht,high-stabilized crystal over oscillator for measurement of accuracy and full input signal conditioning

The four functions are frequency, period,totalize and selt check.

This is acconplished by a single chip microcontroller,The input signal can ge conditioned by attenuation, It is recommended that whole information and details should be read and understood before attempting to operate the instrument for correct operation and best results.

II Specification

The pertinent specifications are listed as follows:

 

1.

Frequency measurements.

Channel A

Range: 10Hz~10MHz direct counter.

10MHz to 100MHz prescaled by proportion.

Resolution: Direct counter: 1Hz?10Hz?100Hz switch selectable.

Presscaled: 10Hz?100Hz?1000Hz switch selectable.

Gate time: 0.01s , 0.1s , 1s switch selectable.

Accuracy: ±1 count±timebase error×measured

Channel B

Range: 100MHz~2.7GHz

Resolution: 100Hz?1kHz?10kHz

Gate time: 0.01s ?0.1s?1s

Accuracy: ±1 count ± time base error × measured frequency

2.

Period measurements

Input: Channel A

3.

Range: 10Hz~10MHz

Rslolution: 10-7s?10-8s?10-9s switch selectable

Accuracy: ±1count±timebase error measured period

Totalize measurements

Input : Channel A

Range: 10Hz~10MHz

Resolution: ±1 count of input

Check: 8 bits repeating display 0~9 together

Input characteristics

Channel A

4.

Input sensitivity

10MHz range: 10Hz~8MHz 20mVrms

8MHz~10MHz 30mVrms

100MHz range: 10MHz~80MHz 20mVrms

80MHz~100MHz 30mVrms

Attenuation: ×1?×20 fixed

Filter(CH1 only)Low pass: AC 100kHz-3dB

Impedance: Approximate 1MO then 35pF

Maximum voltage without damage: 250V(DC+ACrms)

Channel B

Input sensitivity: 20mVrms

Impedance: Approximate 50O

Maximun voltage without damage: 3V

5.

Time base

Timebase frequency: 10MHz

Short term stability: ±3×10-9 for 1s average

Long term stability: 2×10-5 month

Temperature: ±1×10-5 ; 0~40?

Line voltage: ±1×10-7 for 10% change

5.General

Display: 8 digits,0.39 inch green LED display with decimal

point,gate,overflow,kHz,MHz and µs indication

6.

Power requirement: line 220V ± 10% 45Hz~70Hz

Warm-up time: 20 minutes when cold started at 25

Temperature rated range of use: -5~50

Storage and transport: -40~60

Humidity operating: 10~90%RH

Dimension: width :207mm heigh: 85mm depth: 255mm