GT-50 G-Meter Clock Timer Voltmeter
General Description
GT-50 G-Meter Clock Timer Voltmeter - The GT-50 is a Clock, Timer, G-Meter, Voltmeter and Outside Air Temperature instrument enclosed in a milled aluminum case fitting in a standard 2-1/4” instrument hole. Priced from $169, it is a great value.
Thousands of GT-50’s are flying in experimental aircraft. Since FAA approval in 2013, certificated aircraft owners can also enjoy the GT-50’s capabilities.
| GT-50 Features | GT-50 WIth USB - All the features of our Original GT-50 Plus These New Features: |
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Flight Data GT-50 price varies depending on selection above.
| Input Voltage | 9-28 Volts DC |
| Power Consumption: at 14V - | Backlight on: 0.025 Amps, Backlight Off: 0.0008 Amps – It won't run down your Plane’s Battery |
| Dimensions | Fits a Standard 2-1/4” instrument hole. Overall Width and Height 2.375", Depth behind panel .75 “ to back of the connector |
| Weight | 3.0 oz. |
Will the GT-50 run down my battery?
The GT-50 should not be a significant drain on your battery. The latest GT-50 uses 0.0008 Amps when the backlight is off, an amount less than the normal discharge rate of a stored battery. Like a car's clock, it wont run down the battery.
Next time you fly, as a test, read the voltage of your battery after you land and write it down. Next, unplug the GT-50 at the rear connector. When you return, plug in the GT-50 and read the voltage. We suspect the voltage decrease will be the same as if the GT-50 has not been connected.
As an operational test of the GT-50, you can put an ammeter in the hot battery connection and confirm a current draw of .0008 Amps or less.
My GT-50 has No OAT Reading.
The GT-50 will not display temperature unless it sees an OAT probe connected.
Try the following test:
Unplug the GT-50 connector then take an Ohm meter and read the resistance between the green and black wires on the connector that go to the probe. The value should be around 3K OHMS at room temperature. If the circuit is open (infinite resistance) either the wiring is bad or the OAT probe is bad. Test the OAT probe directly by reading the resistance between the two wires coming out of the probe. Again, you should see around 3K Ohms for a good probe at room temperature.
Do you have calibration information for the GT-50?
Sorry, we can not provide calibration data for the GT-50. However you can confirm normal operation and correct calibration of the unit by:
Powering it up on a flat surface. Once it is powered up and reading "1.0", set it upside down on the same flat surface and confirm that it reads "-1.0".
Can I install the GT-50 without having to connect it to my battery?
To use the GT-50 without a hot battery connection, tie both the GT-50 power wires together (the red and yellow wires) and connect them to your instrument power bus. Note that the clock and flight timer will be reset on each power cycle in this configuration.
How do I dim the GT-50 backlight?
The GT-50 backlight is set at a single fixed brightness. We were careful to have the backlight brightness such that it is not too bright for night operations. We fly at night with the GT-50 often and are very sensitive to bright lights in the cockpit. We do not recommend connecting it to a dimming circuit. Here is a comment from a customer who was concerned about the backlight brightness:
"I thought I'd write you to thank you for a superior product. I finally got around to installing one recently and am more than happy. The 'burnt orange' color is very easy on the eyes at night. Crisp and readable."
Why does the GT-50 display go blank when I turn on the master switch, even though the backlight comes on?
Because the red wire is not actually connected to the battery. The red wire of the GT-50 must be connected to a source that is always powered, either the battery or wire directly connected to the battery. Connecting this wire to the master switch will not work. Why….see below?
When the master switch is off, there is power on the wire between the switch and the master solenoid. When the master switch is on, this wire is connected to ground to activate the master solenoid and is no longer “hot”.
Can I use another manufacturer’s OAT probe with the GT-50/Can I use the GT-50 OAT probe with another manufacturers device?
The GT-50 uses an OAT probe with these specifications: “3K” thermistor with a “Z” thermistor curve (B25/100 = 3988 K). The resistance of the probe can be measured at 3000 ohms at 25 degrees C.
Other oat probes that have this specification can be used. Likewise other devices that require a probe with these specifications can use the GT-50 OAT probe.
Can you provide form 8130?
Can you provide a 337?
Do you have an STC?
Is the GT-50 TSO’ed?
Do you have a Certification of Compliance?
Does the GT-50 meet ISO standards?
The GT-50 can be used in certified aircraft. Per this FAA Letter it can be installed in certificated non-transport aircraft. We do not have any other approvals or forms available beyond the FAA letter above.
Mount the GT-50 in any 2-1/4” instrument hole using four 6-32 screws. If you are mounting the GT-50 in an instrument panel with a thirty degree panel tilt, be sure to set your unit as described in the Voltmeter section below.
Operation
Modes: The GT-50 has six modes.
PRESS the (Left) Mode button the switch between modes.
PRESS and HOLD the (Left) Mode button to display the Firmware Version number
About Flight Data
Flight Data Systems, an avionics and instrument manufacturer since 2002, is committed to creating innovative products at exceptional value. Founded by an Electrical Engineer/Private Pilot and an Airline Pilot/Kit Plane Builder, Flight Data Systems combines technical skill and practical experience to create outstanding products. We personally answer all email and support calls, providing the highest level of customer service.
