Hach sc200 User Manual page 32

Figure 21 Pulse Width Modulation control (linear mode)
1 High alarm
2 Low alarm
3 Period
30 English
4 Time (x-axis)
5 Selected source (y-axis)
Figure 22 Frequency control mode
1 High limit
2 Low limit
3 Time (x-axis)
4 Cycle duration
5 Selected source (y-axis)