3d pcb assembly model

Internal assembly of a compact biomedical instrument, cutaway view showing a green 100mm x 80mm four-layer PCB mounted on brass standoffs inside a dark navy ABS enclosure shell. PCB populated with components arranged in four clearly separated zones. Top-left zone has a large LQFP-100 microcontroller chip and a smaller WiFi module with an antenna trace. Bottom-left zone has two DIP-8 instrumentation amplifier ICs, a TO-92 current source transistor, and a small MSOP ADC chip. Top-right zone has a purple MSOP-16 impedance analyzer IC next to a silver crystal oscillator and a small relay. Bottom-right zone has a red DDS signal generator chip and two orange DIP-8 amplifier ICs. Gold ENIG surface finish on PCB with fine copper trace grid visible. Multiple decoupling capacitors scattered across board. Four BNC connector sockets soldered at the PCB edge facing the front panel. A USB-C connector and microSD slot at the right edge. Fine ribbon cables connecting PCB to a white PTFE probe fixture