Construction of digital survey meter model smd-03 using atmega 8 microcontroller

Digital Survey Meter model SMD-03 has been made. The Digital Survey Meter model SMD-03 was built using the GM LND-714 as the detector, CD4011 as pulse shaping circuit, ATMEGA 8 as a counter circuit and 8x2 LCD as a display. The purpose of the construction of this digital Survey Meter SMD-03 is to develop nuclear instrumentation, especially digital survey meter, especially in improving the stability counting system. The works principle of GM detector to convert the radiation beam into electric pulses. The electrical pulses are inserted into the inverting circuit and pulse shaping circuit to invert the pulses and formed into digitals pulse. The digitals pulses then are inserted into ATMega 8 to be counted and converted into mR/h and then displayed on the 8x2 LCD, measurement range : 0 – 30 mR/h. This instrument is equipped with a buzzer as a sound indicator, this activity includes the manufacture of hardware and software and testing. From the DC high voltage stability test the value of high voltage instability is 0.1%, and from the test results shows the counting linearity value R2 = 1, and counting stability test/chi-square test (X2) = 9.58. The data test results show that the digital survey meter model SMD-03 has been made can function properly.