Apogee TS-100 Owner's Manual - Page 14

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The fan also has a tachometer to monitor blade revolutions per minute (RPM). The tachometer outputs a pulse

voltage signal. The pulse multiplied by 30 yields fan RPMs. The RPM should be near 4500 in full power mode and

2500 in low power mode. In addition to the tachometer output wire, there is a pull-up wire (power input). This

allows a user-defined maximum output voltage from the tachometer, and facilitates interfacing with multiple

measurement devices.