Compaq Presario 3000 Series Operation And Reference Manual page 54

4-8 Compaq 3000 Series UPS Operation and Reference Guide
Nominal
Figure 4-4. Optimal—Utility voltage fluctuating within the UPS operating
range
Nominal
Figure 4-5. Utility voltage fluctuation indicating a shift in nominal voltage
range may be necessary
Operating Range
Utility Voltage
Time
Operating Range
Utility Voltage
Time
Upper Limit
Lower Limit
+ 20%
- 20%