Telpar SP-328 Data Logger Thermal Printer
Rev A 8-26-2010
Page 18 of 19
Appendic C - MCTF for thermal printer mechanism
We call the thermal printer’s reliability is not “MTBF”(mean time between failures), but
”MCTF”(mean cycle to failure). We do calculate the MCTF from the next endurance test result
by reliance level 60%(0.917).
Endurance test result
r/n = 0/5
Test conditions
Specification
Print ratio
25%
12.5%
Print distance
60km
50km
Input pulse
160 million pulse
100 million pulse
Calculate the MCTF
MCTF (anti-pulse characteristic) = 5 x 1.6 x 108 x ( 1/0.25 ) / 0.917
= 3489640131
So the MCTF of anti-pulse characteristic is 3,480 million dots line.
MCTF (abrasive resistance)
= 5 x 60 / 0.917
= 327.1
So the MCTF of abrasive resistance is 327 km.
*Note: The reliability testing and calculations were provided by Seiko for the LTP-2200 printer
mechanism.
