Chapter 3
Theory of Operation
REF 1029568 Rev A BiPAP® Focus™ Ventilator Service Manual © Respironics, Inc. 3-5
External AC/DC Power Supply • 90-240 VAC, 40-60Hz Input
• 120 Watt 18 Volt DC Output
Internal NiMH (Nickel Metal Hydride)
Battery
• 8 cell 3.8 Amp Hour provides 9.6 Volt output
nominal
• In-line thermal fuse
• Built-in thermistor for temperature monitoring
• Nominal charge time under 5 hours
• Nominal run time 45 minutes
Electronic System Components (Continued)
Table 3-2: Electronic System Components
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