CM20 Electronic Chronometer
TYPE CM20 Swiss Chrono
2ATI Swiss Made Chronometer
The THOMMEN CM20 Electronic Chronometer is a 2ATI Swiss made precision chronometer designed to operate under the most stringend conditions in both civil and military aircraft.
Main features
- It utilizes solid-state Liquid Crystal Display (LCD) technology to provide a continuous readout.
- It simultaneously displays the clock-and timer-functions and has several day/night mode backlight options including NVIS A and B compatibility.
- The time function has a dedicated internal power supply to maintain the timekeeping function even when the aircraft power is removed.
Parameters
24 hour clock for UTC or Local Time (LT) in 12/24 hrs format
Up or down counting Elapsed Timer (ET/ETD)
Maintenance Timer (MTH)
Simultaneous display of Clock and either elapsed or night timer readings
Flight Timer (FT) with pre-settable alarm (FTA)
ETD and FTA with a common switching output for an external signaling device
Flight Timer (FT, FTA and MTH) remotely controlled by a configurable switch input
Remote setting functions via serial link (RS-232) in master and slave mode
Installer accessible installation feature settings
Installer customizable Lighting Dimming Curve for day and night mode
Lighting options (white/white, white/red, white/green NVIS A&B)
Comprehensive Built In Test with internal maintenance and failure log
PERFORMANCE SPECIFICATION
TIME BASE ACCURACY
better than ± 0.2 s / 24 h
MTBF
> 20.000 hrs. MIL-HDBK-217
LIGHTING OPTIONS FOR NVIS EQUIPMENT COMPATIBILITY
MIL-STD-3009 TYPE I CLASS B or RTCA/DO-275 or OST 1 00415-81
ELECTRICAL CHARACTERISTICS
SUPPLY POWER:
Nominal 14 or 28 VDC < 300 mA @ 28 VDC
Nominal 14 or 28 VDC < 300 mA @ 28 VDC
(CENTRAL INSTRUMENT PANEL DIMMING MODE SIGNAL)
(CENTRAL INSTRUMENT PANEL DIMMING MODE SIGNAL)
0 to Supply Power Voltage sinks < 5 mA against power return
FT & MTH RUN SIGNAL:
0 to Supply Power Voltage sinks < 5 mA against power return
ETD & FTA ALARM OUTPUT SIGNAL
Solid state switch output sinking < 1000 mA against power return
ENVIRONMENTAL CONDITIONS
TEMPERATURE:
-55° C to +85° C ground survival and storage
-45° C to +70° C continuous operational
further options are available on request
-45° C to +70° C continuous operational
further options are available on request
COOLING
none
ALTITUDE
55.000 ft. for continuous operational and storage
further options are available on request
further options are available on request
HUMIDITY
< 99% rel. humidity non condensing for continuous operational and storage
QUALIFICATIONS
RTCA/DO-160F:
[B2Z]BBB[U2]EWFSFSY[ZI]AZ[ZC](ZN)
[RR]M[A3H33]XXAC
[RR]M[A3H33]XXAC
MIL-STD-810F:
Method 514.5
Method 505.4 Procedure I
Method 505.4 Procedure I
RTCA/DO-178B
Software Level D
RTCA/DO-254:
DAL D
MECHANICAL CHARACTERISTICS
FORM FACTOR
2ATI semi ARINC housing
L 62.0 mm (2.441 in) x W 60.3 mm
(2.375 in) x H 60.3 mm (2.375 in)
L 62.0 mm (2.441 in) x W 60.3 mm
(2.375 in) x H 60.3 mm (2.375 in)
WEIGHT:
210 grams (7.4 oz.)
COLOUR
FED-STD-595 Housing black (37038) or
grey (36118)
Markings white (37875)
grey (36118)
Markings white (37875)
INSTALLATION:
Semi ARINC Housing installs using a metal mounting clamp
Connector Amphenol 71-570123-12-10
mates with MS3116E12-10S
Connector Amphenol 71-570123-12-10
mates with MS3116E12-10S
MECHANICAL DRAWING
Datasheet
Stepfile
Installation & Operation Manual
Declaration of Design and Performance
User Operational Manual
Service Bulletins
No document available for this product.
Service Information Letters
No document available for this product.
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