TAT channel resistance

Between TAT_INPUT_1 and TAT_INPUT_3, ideal relay contacts

59.250Ω

Set a target

Target Ω

Step 0 of 767

30.000 Ω125.875 Ω

Click a relay to open or close it. The highlighted path carries the current.26 relays, normally open

Relays by row

All 768 settings

Step	Resistance (Ω)	R4	R3	R2	R1

Range 30.000 to 125.875 Ω in 0.125 Ω steps, 768 values with no gaps. Total = 30 + (0 or 32) + 8a + 1b + 0.125c, where a, b and c are the positions of the leftmost closed relay in R3, R2 and R1, counted from 0.

In each ladder row only the leftmost closed relay carries current. A row with no closed relay breaks the circuit, so with every relay off at power-up the channel reads open.

In R4, R4-2 bypasses the 32 Ω. To add the 32 Ω, close R4-1 and open R4-2. TAT_INPUT_2 is the same node as TAT_INPUT_3.