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Datcon Hour Meter

Hobbs meter

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An old hobbs meter (soviet union 1970s)
The Hobbs meter is a device that records elapsed time. It is frequently used in aviation applications to record the time that the electrical power (battery master switch) is 'on'. Hobbs is a genericized trademark for products generically called Engine Hour Meters. Hobbs meters are made by Honeywell, but there are other manufacturers such as ENM and Datcon. The meters all run electrically and indicate hours and tenths of an hour (1 tenth = 6 minutes,) but there are several ways that a meter can record the 'Hobbs time':
It can simply measure the length of time that the master switch has been on. This tends to overstate Hobbs time.
It can be activated by oil pressure running into a pressure switch and therefore only runs while the engine is running. Many rental aircraft use this method to preclude the possibility of flying with the master switch off to improperly reduce Hobbs time.
It can be activated by another switch, either an airspeed sensing vane under a wing (as in the Cessna Caravan) or a pressure switch attached to the landing gear (as in many twins.) In these cases, the Hobbs only measures the length of time the aircraft is actually flying. This is for those who wish to record Time In Service. Things like Turbine Actual Runtime are kept like this for purposes of overhaul cycles, and are usually kept by commercial operators under FAR Parts 135, 121, or 125.
It can be activated when the engine alternators are online (as in the Cirrus SR series).
General Aviation Use
For purposes of GA (general aviation,) Hobbs time is usually recorded in the pilot's log book, and many Fixed-Base Operations (FBOs) that rent airplanes charge their hourly rate based on Hobbs time. Tach Time is recorded in the engine's log books and is used for such things as determining when the oil should be changed and the TBO (time between overhauls.) Tach (tachometer) time differs from Hobbs time in that it is linked to the revolutions per minute (RPM) of the engine. Tach Time records the length of time at some specific RPM 2400 RPM for example. That means that it is most accurate at cruise RPM, and least accurate while taxiing or stationary with the engine running. At these times, the clock runs slower. Depending on the type of flight, tach time can be 1020% less than Hobbs time. Many organizations such as flying clubs charge by Tach Time so as to differentiate themselves from FBOs by the fact that 10-20% less time recorded makes it 10-20% cheaper to fly (if the hourly rate is the same.)
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