The CH93 series, part numbers 6420093-( ), is a multi-function digital clock / chronometer / voltmeter / temperature unit with multiple options for USB Charging Ports. The unit fits into a standard, rear-mounted, 2-¼” avionics panel cutout. Power is drawn from the aircraft main bus to light a white, six digit, seven segment LED clock. The clock can display several different modes: local time, universal time, flight timers, elapsed and countdown timers and optionally, bus voltage and up to two temperature inputs. The CH93 display is daylight readable with two methods of brightness control. It can be controlled automatically using the internal photocell or manually with an external dimming bus voltage. The CH93 clock has an internal battery to maintain clock time and flight timer memory when the aircraft is not in use.
The USB Charging Ports are designed as DCPs (Dedicated Charging Ports) to industry-standard protocol per the USB Battery Charging 1.2 Compliance Plan. Some models also comply with the higher power requirements of USB Power Delivery 2.0 and 3.0. Early-generation or smaller consumer electronics typically accept one (1.0) amp during charging. However, newer electronics, such as tablets and larger devices can accept, and in some cases, require up to 3 amps to charge and operate.
Makes life so much easier especially with powering and keeping powered the handheld GPS
Appears to be well made, and presents a very clean, high contrast, white LED display. I chose this clock since it shows seconds, and is also able to show local and UTC/GMT time (with an annunciator with which mode it is in). I prefer 24 hour display, though this unit can also display in 12 hour format if desired. The dual 3A USB outputs will be used with an iPad Pro and/or iPad mini - so this should keep up with the power drain when using ForeFlight. There are 4 wires to connect up - power, ground, dimming, engine timer. It can be just connected up with 2 wires - power and ground. Refer to the instructions for the engine timer connections (as in simply connect to ground to count up whenever the unit is powered, or connect to a switched ground output for engine/flight time). Albeit a bit expensive, its a great addition to the instrument panel.
I have bought two of these. The first has been installed for about 4 years with no issues. The 2nd unit started acting up after about 1 month in operation. First the charging capability failed. Then the LEDs that make up parts of the digits started to fail. Currently still installed in the aircraft, but I can no longer read the digits reliably on the clock or timer.
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Yes, this works on 10-32 VDC.
That pin is for the flight timer. If you wish to have this feature, you will need it.
Per the manufacturer the unit would need to be sent in to them for replacement. However the battery is rated to last 10 years.