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Extech Instruments 480846 Скачать руководство пользователя страница 15

480846   V2.3   7/09 

15

Electrical Specifications 

Unless otherwise stated, the specifications hold under the following conditions: 

•

 The meter is located in the far-field of a source, the sensor head is pointed towards 

the source. 

•

 Ambient temperature:  

+23

±

3  

•

 Relative air humidity:  

25% to 75% 

Sensor type:  

Electrical field (E) 

Frequency range:  

10MHz to 8GHz

 

Specified measurement range: 
CW signal (f > 50MHz)

:  

20mV/m to 108.0V/m  
53

μ

A/m to 286.4mA/m 

1

μ

W/m

2 

to 30.93W/m

2

 

0

μ

W/cm

2 

to 3.093mW/cm

2

 

Dynamic range:  

Typically 75dB

 

Absolute error at 1 V/m & 50 MHz: 

±

1.0dB 

Frequency response: 

Sensor (with typical CAL factors)

:  

±

1.0dB (50MHz to 1.9GHz) 

±

2.4dB (1.9GHz to 8GHz) 

Isotropy deviation

:  

Typically 

±

1.0dB (f>50MHz) 

Overload limit

:  

10.61mW/cm

2

 (200V/m) 

Thermal response (0 to 50°)

:  

±

0.5dB 

 

 
 
 
 
 
 
 
 
 

 

Содержание 480846

Страница 1: ...User s Guide RF EMF Strength Meter Model 480846 ...

Страница 2: ...erate or conduct electromagnetic energy Be aware that secondary radiators e g reflective objects such as a metallic fence can cause a local amplification of the field Be aware that the field strength in the near vicinity of radiators increases proportionally to the inverse cube of the distance This means that enormous field strengths can result in the immediate vicinity of small radiation sources ...

Страница 3: ...s include the electromagnetic fields from radio broadcasting and TV transmitters Electric Field Strength This is a field vector quantity that represents the force F on an infinitesimal unit positive test charge q at a point divided by that charge Electric field strength is expressed in units of volts per meter V m Use the units of electric field strength for measurements in the following situation...

Страница 4: ... Cal key c Press this key to change the sensor axis All axis X axis Y axis Z axis d Press and hold this key while turning the meter on to switch the device to the calibration factor setting mode press SET key to exit this mode 8 SET key c Press this key to enter the current data and time setting mode Press again to exit 9 12 STWX keys Used to set current date and time datalogging interval time ala...

Страница 5: ...measured value to memory indication 9 Manual data memory mode indication 10 Manual data memory address number 1 99 11 ALM Alarm function on off or alarm setting indication 12 Displays when the alarm function is on and the instantaneous measured value exceeds the limit value indication 13 hh mm ss Time displayed YY MM DD Date displayed 14 CAL Calibration factor indication or setting indication from...

Страница 6: ...int it at the target to make the measurement Explanatory notes Units of measurement The meter measures the electrical component of the field the default units are those of electrical field strength mV m V m The meter converts the measurement values to the other units of measurement i e the corresponding magnetic field strength units μA m mA m and power density units μW m 2 mW m 2 or μW cm 2 using ...

Страница 7: ...parator Setting the units of measurement Press the UNIT key to step through the units display UNIT UNIT UNIT Z XY XY Z a UNIT b d c 2 Z XY 2 Z XY a Electric field strength V m b Computed magnetic field strength mA m c Computed power density mW m 2 d Computed power density μW cm 2 Setting the result mode Instantaneous result mode is automatically set when the meter is turned on Press the MAX AVG ke...

Страница 8: ...Z X Y Z Z Y X 1 Press key to turn off the meter 2 Press and hold the TIME ALARM key then press key to turn on the meter the display then shows ALM and The Alarm setting mode The four flashing digits can now be changed 3 Press or key to increase or decrease the value 4 Press SET to store the new setting value and exit ...

Страница 9: ...e sound function off When the meter is normally turned on the audible sound function is on 1 Press key to turn off the meter 2 Press and hold MAX AVG key and turn on the meter again to disable the audible sound the symbol will disappear from the display Setting the auto power off function off When the meter is normally turned on the auto power off function is on 1 Press key to turn off the meter 2...

Страница 10: ...re unknown 3 Pay special attention to measuring the neighboring vicinity for possible radiation sources Apart from active sources those components connected to a source may also act as radiators For example the cables used in diathermy equipment may also radiate electromagnetic energy Note that metallic objects within the field may locally concentrate or amplify the field from a distant source Lon...

Страница 11: ...splay indicates one reading has been stored When the memory location number shows 99 to indicate the manual data memory is full the user must clear the entire contents of the data memory before storing new values Reading individual measured values Z Y X Exit Entry Reading mode indicate Reading memory location X Y Z 1 Press READ key the display shows reading mode 2 Press or key to select the desire...

Страница 12: ...e display will shows and 3 Press to select 4 Press SET to clear memory and exit Setting Current Data and Time 1 Press the SET key to enter this mode the SEt mark is displayed 2 Press W or X key to move flashing two digit to desired setting position hh mm ss or YY MM DD 3 Press S or Tkeys to set the current time hh mm ss and current date YY MM DD 4 Press the SET key to store setting value and exit ...

Страница 13: ...n at all points Setting the calibration factor CAL Hold on Power off When the meter is normally turned on the calibration factor set value will display for 2 seconds 1 Press key to turn off the meter 2 Press and hold on the XYZ CAL key then press key to turn on the meter to enter the calibration factor setting mode the CAL SEt marks is displayed 3 Press S or Tkey to increase or decrease the value ...

Страница 14: ... m 2 0 001μW cm 2 Setting time T Typically 1s 0 to 90 of measurement value Display refresh rate Typically 0 5 seconds Display type Liquid crystal display LCD 4 digit Audible alarm Buzzer Units mV m V m μA m mA m μW m 2 mW m 2 W m 2 μW cm 2 mW cm 2 Display value Instantaneous measured value maximum value or maximum average value Alarm function Adjustable threshold with ON OFF Data memory and read s...

Страница 15: ...25 to 75 Sensor type Electrical field E Frequency range 10MHz to 8GHz Specified measurement range CW signal f 50MHz 20mV m to 108 0V m 53μA m to 286 4mA m 1μW m 2 to 30 93W m 2 0μW cm 2 to 3 093mW cm 2 Dynamic range Typically 75dB Absolute error at 1 V m 50 MHz 1 0dB Frequency response Sensor with typical CAL factors 1 0dB 50MHz to 1 9GHz 2 4dB 1 9GHz to 8GHz Isotropy deviation Typically 1 0dB f 5...

Страница 16: ...is responsible for shipping charges freight insurance and proper packaging to prevent damage in transit This warranty does not apply to defects resulting from action of the user such as misuse improper wiring operation outside of specification improper maintenance or repair or unauthorized modification Extech specifically disclaims any implied warranties or merchantability or fitness for a specifi...

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