K7S5A and Motherboard Monitor Settings - Diode Sensor?

[DrDr]

I think I finally got Mobo Monitor to work, but I have a question. There are 6 onboard sensor options:

Sis950/ITE8705F-1
Sis950/ITE8705F-1 Diode
Sis950/ITE8705F-2
Sis950/ITE8705F-2 Diode
Sis950/ITE8705F-3
Sis950/ITE8705F-3 Diode

According to MBM's site, sensors 1, 2 and 3 correspond to:

1: "Primary Chip Sensor"
2: "Case Sensor"
3: "CPU Sensor"

Right now, with the side of my case off, the three temps are: 10/25/41. Temps were 11/28/44 with the case enclosed. Still very good. But I chose all the settings without the "Diode" attachment. If I set Mobo Monitor to read the "Diode" sensors, I get completely different readings: Variable/91/-29

Furthermore, the "Primary Chip Sensor" or Sensor 1 is highly variable (from -100 to +100 almost).

I'm almost positive the right settings are how I have it initially set up. However, does anyone know what the "Diode" Sensor means? Furthermore, what is the "Primary Chip Sensor?" What is it reading? It must be erading something other than and cooler than the CPU since the CPU is sensing 41-44 C and the Primary Sensor is only at 10 (while the case itself is at 25, about room temp (remember chemistry?).

Thanks,

Dave