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| + | [* black] Let's take a quick break from disassembly to investigate the circuit board. |
|---|---|
| + | [* black] The yellow box is the power supply circuitry. It provides the three regulated and one unregulated rail used by the device. |
| + | [* black] The red box shows the high speed high voltage relays. These switch between ranges. They make a nice soft ping when they activate. |
| + | [* black] The orange section is the multiplexer, most function switching occurs here. The large white square is a high voltage precision matched resistor divider from Craddock |
| + | [* black] The blue and green boxes hold the -4.2V and -6.4V references respectively. The 6.4V zener (shown in image 2) is small, orange and VERY expensive. It is a 1N4579. |
| + | [* black] The purple box shows the multi-slope integrator circuit. The white box is the integrating capacitor |
| + | [* black] Lastly, the black cylinder with four wires going to it is a special four-wire resistor used in precision current measurements. |
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