1. Fit jumper JP1 between pins 1 & 2 (the non-CAL position)
2. Set the [RATE (f)] and [RANGE] to a low frequency such that you can see the LED slowly changing in colour/intensity
3. Adjust P103 until the LED sweeps equally through both RED and GREEN

Offset Adjustment

1. Fit jumper JP1 to the 'CAL' position
2. Monitor the [TRIANGLE] output
3. The output will tend to drift towards one of the power rails
4. Applly a pulse to the [RESET] input
5. The output will jump to 0V
6. Adjust P102 until the output remains stable at 0V for a period of several seconds
7. Repeat steps (4) to (6), progressively switching the multimeter to more sensitive ranges, until the drift is only a few hundred millivolts in several seconds