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GDY-500M Instruction Manual
Release Date:
2021-10-28
GDY-500M Instruction Manual for the Optoelectronic Area Measurement Instrument
GDY-500M The optoelectronic area meter is used for rapid measurement of plant leaf area and can also measure the area of other irregularly shaped objects. It is widely used in agriculture. , forestry, meteorology, and other relevant departments.
I. Technical Parameters
1.1 , Maximum measurement area: 500 cm2
1.2 , Maximum measurement thickness: 8mm
1.3 , Measurement error: not greater than ± of full scale 2%
1.4 , Resolution: Minimum Resolution 1cm2
1.5 , Display method: blue-backlit LCD
1.6 , Measurement modes: single measurement, cumulative measurement, average measurement
1.7 , Storage: Can be stored 20 Measurement data is retained even after power loss.
1.8 , Power Supply: 10800mAh Lithium-ion rechargeable battery.
II. Structural Diagram:
III. Key Instructions:
Mode / Mute: Allows switching among four operating modes: single measurement, cumulative measurement, averaging, and data mode. Press and hold this button to enable or disable the key-beep sound.
Zeroing: The zeroing procedure performed before measurement.
Read: In data mode, you can read the saved 20 Measurement data item.
Measurement: Perform data measurement operations.
Clear: In data mode, press and hold this button to clear the saved data.
Confirm / Storage : After performing the measurement, the current measured value will be displayed. Press this button to confirm the end of the current measurement; press it again to save the current measurement data.
IV. Operating Procedures:
This instrument offers four measurement modes: single measurement, cumulative measurement, average measurement, and data mode. In measurement mode, zeroing must be performed before taking a measurement.
Zeroing: In measurement mode, clear the measurement plate, cover it with the lid, and press the “Zero” key. Zeroing is complete, and the font for the current mode will be displayed in reverse. 3 Zeroing in all measurement modes is performed according to this procedure.
Single measurement: measures only once and displays the current measurement value, suitable for values less than 500cm2 Area measurement.
Cumulative measurement: the sum of multiple areas to be measured.
Average measurement: consecutive within the same area 10 Calculate the average from the measurements.
4.1 1. Power On: Press the power switch to turn on the instrument. You will hear a “beep,” and the instrument’s screen will display the power-on message. LOGO Then enter “Single Measurement Mode.”
4.2 Single measurement operation: Press the “Mode” key to select the single-measurement mode. Follow the on-screen prompts; once zeroing is successful, the “Single Measurement” text will appear in reverse. Open the cover, place the object to be measured inside, close the cover, and press the “Measure” key. The screen will then display the area value of the object. Press the “Confirm” key to confirm that the measurement is complete, then remove the object. If you need to store the result, press the “Store” key again to save the current measurement value.
4.3 Cumulative measurement operation: Press the “Mode” key to select cumulative measurement mode. Follow the on-screen prompts; once zeroing is successful, the “Cumulative Measurement” text will appear in reverse video. Open the cover, place the first item to be measured inside, close the cover, and press the “Measure” key. The screen will display both the area value for this measurement and the cumulative area value. Press the “Confirm” key to confirm that this measurement is complete, then remove the item. The number of cumulative measurements will be displayed in the upper-right corner of the screen. Repeat the above procedure for each subsequent item to be measured, thereby obtaining the final cumulative area value.
Note: When the “Save?” prompt appears on the screen, pressing the “Store” key will terminate the cumulative measurement operation and save the accumulated area value.
4.4 , Average measurement operation: Press the “Mode” key to select the average measurement mode; follow the on-screen prompts to perform zeroing. Once zeroing is successful, the “Average Measurement” text will appear in reverse. Open the cover, place the item to be measured inside, close the cover, and press the “Measure” key. The number of consecutive measurements will be displayed in the upper-right corner of the screen. When the count reaches 10 At that time, it will display 10 Average of the measurements. Press the “Confirm” key to confirm that this measurement is complete, then remove the test item.
4.5 Data Operations: Press the “Mode” key to select Data Mode; the number of saved data records will be displayed in the upper-right corner of the screen. Press the “Read” key repeatedly to page through the saved data. Press and hold the “Clear” key to erase all data.
4.6 Mute: Press and hold the “Mute” button to enable or disable key sounds.
4.7 Power off: Press the power switch directly to turn off the instrument.
4.8 Low-battery indicator: When the battery level drops to the instrument’s minimum operating threshold, a flashing battery icon will appear on the screen. At this point, the supplied charger should be used to recharge the battery promptly.
V. Measurement of Light-Transmitting Area
We consider crop leaves that are opaque or allow only limited light transmission to be S Measure = S real , if the crop receives more light, S Measure real , the light transmittance of this crop must be calculated.
1. Calculate the transmittance of a translucent object.
to put 100cm2 Place the transmittance test frame on the acrylic sheet. Completely cover it with a translucent object. Read the value displayed on the meter. For example: after completely covering the leaf area of the translucent object, the reading is 485 (or other values), the transmittance calculation formula is as follows:
eta = （ 500-S Measurement) /(S Measure -400) × 100%
eta ------ Light transmittance of translucent objects
S real =(S Measure -400) X (1+ eta )
S real ------ The actual area value of a translucent object
For example: Measuring the light transmittance of soybean leaves at a specific location.
First, zero the instrument, then place to put 100cm2 The light transmittance test frame is placed on an acrylic sheet, and the soybean leaf is placed… 100cm2 The measurement window is fully covered, and the instrument displays S Measure =495cm2
eta = （ 500-495 ) /(495-400) × 100% = 5.26%
S real =(S Measure -400) X(1+ eta ) =(495-400)X(1+5.26%)=99.99 cm2
2 , instrument for measuring the area of various translucent objects
Because plants and crops vary in their growth stages, leaf thickness, and other characteristics across different regions and climatic conditions, their light transmittance also differs. When measuring the light-transmitting leaf area of a particular crop, one should first determine the light transmittance of that specific leaf before proceeding with the measurement of the entire crop. S The true value can be calculated either by performing a single measurement or by summing multiple measurements.
VI. Precautions
5.1 , the instrument at least every 2 It needs to be charged once a month.
5.2 , Do not measure beyond 8mm The object to be measured for thickness.
5.3 • Turn off the instrument promptly after use to conserve power.
Harbin Optical Instruments Factory Co., Ltd.
HARBIN OPTICAL INSTRUMENT FACTORY LTD.
ground Address: Jingwei Third Road, Daoli District, Harbin City 32 Number
Post Editor: 150010
Electricity Words: 400-030-0319 0451-84286338
network Address: www.hrboptical.com
E-mail： hopt@hopt.cn
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