TPY-6A soil tester circuit

TPY-6A soil tester circuit tester soil by the rectifier, filter circuits, light circuits, switching power supply and voltage regulator circuit, logarithmic amplifier circuit and digital display circuit. A soil tester for the AC and DC. Select the switch to the DC side, compared to battery-powered; the selection switch to the AC side, compared to 220V alternating current through the rectifier, power supply filter circuit on the machine, so you can easily use the grass-roots power shortage in the region. 2, the light source is specially designed circuit voltage regulator circuit, the external power supply can have large fluctuations or insufficient battery can guarantee a steady source of luminous intensity, in order to ensure the accuracy of the experiment. 3, since the logarithmic amplifier and digital display circuit requires precision positive and negative power supply, so the design of a dedicated power supply circuit and voltage regulator circuit, the output voltage of ± 5V supply high stability of the road work. 4, logarithmic amplifier is an important part of soil tester, use TCL7650 integrated circuits and EDMIC differential pair and peripheral components logarithmic amplifier, so that the receiver from a selenium photocell signal logarithmic law of amplification, and selenium photocell Spectral characteristic curves to match the output level of nutrient content of linear law to display. 5, the figures show the number of significant part of the selection GM035 module, display f Ning Xi, reliable, easy reading. Whole circuit with reasonable design, stable performance, easy to use features. The past two years it has already eliminated hundreds of reports, reliable, well received by users. Instrument Name: Soil Testing Instrument Model: Features TPY-6A soil tester: can detect soil, plants, chemical fertilizers, bio-fertilizers and other samples available nitrogen, available phosphorus, available potassium, plants of total nitrogen, total phosphorus, total potassium, organic matter content, soil pH and soil salinity. Beijing has a display function, can automatically detects the sample time recording and preservation. Test data for 1000 (the test sample time, place, all kinds of nutrients results) and other related information stored, the data can be called up view. You can print out the test date, sample number, test items, sample content, crop varieties, fertilizers, variety, quantity and other relevant information fertilization, detailed and rich. Soil tester technical parameters: Stability: A value (absorbance) drift of less than three minutes 0.003 Repeatability: A value (absorbance) of less than 0.005 linearity error: less than 3.0% Sensitivity: red ≥ 4.5 × 10-5; Blu ≥ 3.17 × 10-3 wavelength range: red 620 ± 4nm; blue 440 ± 4nm; Green 520 ± 4nm Product details: Soil Tester http://www.top17.net/yq_list/yq_50_1.html Zhejiang Top Instrument http://www.top17.net/