TM 1-1510-225-10 2-60 alphabetic, 3 ½   -numeric character digital display and a 39 segment bar graph display.  The bar graph display is  nonlinear.   The  indicator  has  a  digital  display  range of 0 to 110.0% RPM while displaying current N₁ and 0 to 199.9% RPM while displaying exceedence N₁.  The bar graph display range is 0 to 105.0% RPM. The  digital  display  shall  contain  dashes  (------) when the measured N1 is greater than 110.0% RPM.   When displaying EXCEEDENCE N1 values, the actual measured  value,  not  "-----",  shall  be  displayed,  up  to 199.9% RPM. The   indicator   shall   perform   BIT   on   the   LCD display, ROM, RAM, EEPROM, and input signal.  The display  BIT  will  consist  of  displaying  all  active  LCD segments  for  3  seconds  on  power  up.    If  the  ROM  or RAM fails BIT the indicator display will be blank.  If the input signal fails BIT the indicator will display 0 on both the digital and bar graph displays.  If the EEPROM BIT fails  the  indicator  will  prefix  the  digital  display  with   F.   BIT failures shall not be stored in EEPROM.  Failures detected   will   not   affect   the   display   after   power   is cycled unless the failure is again encountered. Exceedence  events  will  be  stored  in  EEPROM memory.    Each  event  record  will  consist  of  two  16-bit words.   One  word  will  contain  the  peak  percent  RPM measured  during  the  event  and  the  other  word  shall contain the event duration in seconds.  A maximum of 50 events shall be recorded.  If more than 50 events are recorded, only 50 shall be stored.  As new events are recorded, the oldest events shall be discarded. The  indicator  shall  prefix  the  digital  display  with an E when an event is being or has been recorded and not  played  back.    The  indicator  will  start  recording  an event  immediately  when  the  indicator  has  measured percent RPM greater than 102.6 or when the indicator has measured percent RPM above 101.5 continuously for  10  seconds.    The  indicator  will  end  recording  and store   the   event   when   the   measured   percent   RPM drops to 101.5 or lower. NOTE Pressing  the  EXCEEDENCE  ERASE  switch for  longer  than  0.2  seconds  will  cause  all events    to    be    erased    from    non-volatile memory.      There   are   no   provisions   for erasing individual events.  To initiate the event display, press the EXCEEDENCE   DISPLAY  switch  for  0.2  seconds  or longer.  Each event display will consist of the following cycle: 1.   The  event  number  will  be  displayed for 2 seconds. 2.   The event peak percent RPM shall be displayed for 2 seconds. 3.   The event duration, in seconds, will be displayed for 2 seconds. All  three  data  items  displayed  during  playback shall   be   prefixed   with   a   P  unless  an  EEPROM  BIT failure has been detected in which case the display will be prefixed with an  F. Once   an   event   playback   sequence   has   been performed, the  E  prefixed  to  the  digital  display  will  be removed.   All  event  data  is  still  available  for  playback until  the  data  is  erased.    The  display  will   be prefixed with an  E again on the next power up cycle if the old data   has   not   been   erased   or   if   another   event   is recorded. (4)   Engine   Oil   Pressure   and   Temperature Indicator.   The indicator displays the measured engine oil    pressure    and    engine    oil    temperature    on    two separate   23-segment   nonlinear   bar   graph   displays.   The   oil   pressure   indicator   has   a   bar   graph   display range  of  0  to  200  psi.    The  engine  oil  temperature portion of the gauge has a range of 0 to 120  C.  The segment  display  resolution  for  the  oil  pressure  is  20 psi in the 0 to 60 psi range, 5 psi in the 60 to 140 psi range, and 20 psi in the 140 to 200 psi range. The   indicator   has   a   BIT   on   the   LCD   display, ROM,  RAM,  and  the  signal  input  path.    The  display BIT consists of displaying all active LCD segments for 3 seconds on power up.  If the ROM or RAM BIT fails the  indicator  display  will  be  blank.    If  the  input  signal fails BIT the indicator shall display 0 psi. (5)   Fuel  Flow  Indicator.    The  indicator  shall display   the   measured   fuel   flow   concurrently   in   a   1 alphabetic,   3   ½   -numeric    character    display    and    a 41-segment bar graph display. The indicator has a digital display range of 0 to 600 pounds per hour.  The bar graph displays a range of  0  to  600  pounds  per  hour.    The  digital  display  will contain dashes (------)  when  the  measured  fuel  flow  is greater than 600 pounds per hour. The  indicator  shall  perform  BIT  testing  on  the LCD  display,  ROM,  RAM,  and  the  signal  input  path.   The  display  BIT  consists  of  displaying  all  active  LCD segments for 3 seconds on power up.  The signal input BIT  verifies  the  range  of  the  incoming  signal.    If  the ROM  or  RAM  fails  BIT  the  indicator  display  will  be blanked.  If the input signal fails BIT the indicator shall display "0" on both the digital and bar graph display.