User's Guide RF EMF Strength Meter Model 480836
Safety Information CAUTION Before making a measurement, check if the low battery symbol ( + ) is shown on the display when the meter is switched on. Replace the battery if the symbol is displayed. In the case of prolonged storage, it is preferable to remove the battery from the meter. Avoid shaking the meter, particularly in the measurement mode. The accuracy and function of the meter may be adversely affected by exceeding the specified limits as well as by improper handling.
Introduction Fundamentals Electromagnetic Radiation This meter is used to indicate radiated electromagnetic fields. Wherever there is a voltage or a current, electric (E) and magnetic (H) fields arise. Examples 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.
Features This meter is a broadband device for monitoring high-frequency radiation in the specific ranges of 900MHz, 1800MHz, and 2.7GHz. Other measurements can be made, for reference purposes only, using the entire range of 50MHz to 3.5GHz. The non-directional electric field and high sensitivity also allow measurements of electric field strength in TEM cells and absorber rooms.
Operation Front Panel Description (1). E-field sensor. (2). LCD display. (3). MAX/AVG/ key : Press this key to scroll through the following: “Instantaneous” “Max. instantaneous” “Average” “Max. average”. In the read mode, press this key to exit. In the alarm setting mode, press this key to store the setting value. Press and hold this key while turning the meter on to disable the audible sound. The “ ” symbol will disappear. (4).
LCD display description (1). : Auto power off function on / off. (2). : Audible sound function on / off. (3). MAX: Maximum measured value displayed. MAX AVG: Maximum average value displayed. (4). AVG: Average measured value displayed. (5). + : Low battery indication. (6). Units : mV/m and V/m : Electric field strength. A/m and mA/m : Magnetic field strength. 2 2 2 2 2 W/m , mW/m , W/m , W/cm and mW/cm : Power density (7). (8). (9).
Using E-field sensor The 3-channel sensor is located at the top of the meter. The three voltages generated by the sensor are fed back to the meter. In far-fields, an E-field sensor is preferable due to the greater bandwidth. The E-field sensor frequency ranges from 50MHz to 3.5GHz (calibration accuracy only supports measurements in the 900MHz, 1800MHz, and 2.7GHz ranges, other measurements made in the 50MHz to 3.5GHz range are for reference purposes only).
Alarm limit value (ALM) The alarm limit value is used to monitor the display value and control the alarm indication function. The alarm limit value can be edited in the displayed V/m unit; the smallest value that can be set is 0.05V/m. NOTE: Alarm limit function can only be used for the total three axial measurement value. Calibration Factor (CAL) The calibration factor “CAL” corrects for variances in the frequency response of the field sensor.
Setting the meter Setting the units of measurement Use the UNIT key as follows. (a) (b) Z UNIT Z XY XY UNIT UNIT (c) (d) 2 Z 2 UNIT XY Z XY (a). Electric field strength (V/m). (b). Computed magnetic field strength (mA/m). 2 (c). Computed power density (mW/m ). 2 (d). Computed power density (W/cm ). Setting the result mode Instantaneous result mode is automatically set when the meter is turned on.
Setting the alarm limit value (ALM) 2 2 MEM ALARM READ MEM READ MEM READ MEM READ 2 MEM 2 READ 2 MEM 2 READ MEM READ MEM READ key to turn off the meter. 1. Press key to turn on the meter, the display then 2. Press and hold the MODE key, then press 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 key to store the new setting value and exit. 10 480836-en-EU_V5.
Switching the alarm function on or off ALARM ALM ALM 1. Press ALARM key for 2 seconds to switch the alarm function on or off. The “ALM” and “ ” symbols in the display indicates that the alarm function is on. 2. When the alarm function is on, the display will show “▲” if the instantaneous measured value exceed the limit value. Setting the audible sound function off When the meter is normally turned on, the audible sound function is on. key to turn off the meter. 1. Press 2.
Setting the backlight auto off function off UNIT 1. Press key to turn off the meter. 2. Press and hold key and turn on the meter again to disable the backlight auto off function. Setting the calibration factor (CAL) MEM MEM READ READ 1. Press the key turn to off the meter. MEM READ and keys, then press the key to turn on the meter, 2. Press and hold down the the display then shows “CA” (The Calibration factor setting mode). READ MEM 3. Simultaneously press the 4.
Long-term exposure measurements Location: Place the meter between yourself and the suspected source of radiation. Make measurements at those points where parts of your body are nearest to the source of radiation. Note: Use the “Average ” or “Max average” modes only when the instantaneous measurement values are fluctuating greatly. Alarm function Use this feature in the “Instantaneous”, “Max. Instantaneous”, “Average” or “Max. Average” modes.
Storing readings The meter includes a non-volatile data memory that can store a maximum of 99 measured values. Storing individual measured values MEM The current memory location number appears in the lower right small display. Once you press the MEM key, it will store a displayed value and increment the memory location by one. Each flash of the “ ” symbol display indicates one reading has been stored.
Deleting stored values Once the memory is full, the entire contents of the memory can be cleared. MEM 1. Press MEM READ to turn off the meter. 2. Press and hold MEM and turn on the meter again; the display will shows: “ ” and “ ”. 3. Press ▼ to select “ ”. 4. Press ▲ to clear memory. 15 480836-en-EU_V5.
Specifications General Specifications Measurement method: Digital, triaxial measurement. Directional characteristic: Isotropic, triaxial. Measurement ranges: One continuous range 2 Display resolution: 0.1mV/m, 0.1A/m, 0.1W/m , 0.001W/cm 2 Setting time: Typically 1s (0 to 90% of measurement value). Display refresh rate: Typically 0.5 seconds Display type: 4-digit Liquid-crystal display (LCD) Audible alarm: Buzzer.
Electrical Specifications Unless otherwise stated, the following 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: +23C3C Relative air humidity: 25% to 75% Sensor type: Electrical field (E) Frequency ranges: 900MHz, 1800MHz, and 2.7GHz (measurements can be made, for reference purposes only, using the entire range of 50MHz to 3.
