Nixie Clock IN-18 Blue Dream User Manual Download Page 13

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Press button 2 and button 3 to set the fifth digit (to

'0')

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Press button 1 (short) to jump to the sixth digit

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Press button 2 and button 3 to set the sixth digit (to

'0')

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Press button 1 long time (0.5 seconds) to leave the

submenu 2.14.

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Press button 1 long time (0.5 seconds) to leave the

main menu 2.

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Clock starts running in day display mode or night

power-down mode.

Submenu 2.15: Setting the RTC drift
compensation

Every RTC chip (RTC=Real Time Clock) does have a
drift.  This  drift  depends  to  the  ambient  temperature,
buffer  battery  voltage,  aging  and  other  factors.  This
clock  has  a  feature  called  “drift  compensation”  which
allows  compensating  that  drift  nearly  to  zero.  The
value  and  the  polarity  (faster  or  slower)  for  the  drift
compensation are set in this submenu. If this submenu
is entered, display shows 15:xy:yy.

‘x’  indicates  polarity  (faster  or  slower)  for  the  drift
compensation
‘yyy’  indicates  the  value  for  the  drift  compensation  in
seconds per 50 days

The settings at position ‘x’ mean the following:
0:  positive drift compensation (clock will run faster).
1:  negative drift compensation (clock will run slower).

‘yyy’  indicates  the  seconds  per  50  days  the  time  is
corrected.
The value rage for ‘yyy’ is 000-999.

The setting will be explained in an example:
Assumed  the  setting  in  this  submenu  is  value  is
15:11:23.  That  means  that  the  time  automatically  will
be  corrected  minus  123  seconds  in  50  days.  If  user
wants  to  adjust  the  clock  to  a  better  accuracy  he
should  let  it  run  for  exact  50  days  and  count  the
seconds it runs too fast or too slow and add or subtract
it  to  the  setting  in  this  submenu.  For  example  if  the
clock runs 2 seconds too fast in 50 days, the setting in
this submenu must be increased 2 seconds. Example:
If  the  setting  was  123  –  the  new  setting  must  be
123+2=125  –  then  the  time  will  be  corrected  125
seconds  in  50  days  instead  of  123  seconds  and  the
clock  runs  slower.  User  can  use  an  atomic  or  radio
controlled clock to measure the drift.

Notes:
-  The  RTC  drift  compensation  only  is  executed  if  at

submenu 1.3 operation mode “01” (RTC) is chosen.
If 02, 03, 04 (GPS or DCF) is chosen, the RTC drift
compensation is NOT executed, even not if it is set
in submenu 2.15.

- The RTC drift compensation only does work

correctly if the clock always is connected to the
mains power.

Using  button  2  and  3  the  chosen  digit  can  be  set.
To  switch  to  the  next  position,  button  1  must  be
pressed.
To  confirm  this  step  shifting  from  digit  to  digit,  the
following digit scrolls through by using the flip over
effect.  After  the  last  digit,  the  first  digit  shall  be
enabled again.

Setup Example:

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The value in this menu shall be set to 15:11:23.

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Clock is in day display mode or night power-

down mode.

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Press button 1 (short) to enter the main menu 2.

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Clock stops and displays the current set alarm

time.

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Press button 2 fourteen times to reach submenu