Nixie Tube Clock ‘Elite’
Issue 3 (25 July 2018)
www.pvelectronics.co.uk
- 32 -
Cancelling Alarm
:
Press ‘ALARM’ briefly to cancel alarm and enter snooze mode, or a longer
press until the clock bleeps, to cancel snooze. Alarm remains set for
subsequent days.
Rapid DST Adjustment
Press ‘DST’ briefly to toggle between DST and standard time. The
indicator shows whether DST mode is active or not.
Note, that GPS time data does not contain DST information, so the DST
status will need to be set manually in GPS sync mode as well as manual
time-set mode.
Invoking Cold Start Tube Test
A cold start is when the Supercapacitor C7 is discharged. On a cold start,
time and date are lost and the clock will perform the ascending tube test
on power up. To force a Cold Start, do the following:
Toggle the DST on by pressing the DST button if necessary
From time display, press ALARM once.
Press ADJ once to illuminate the ALARM LED
Immediately disconnect power.
The Power sensing / sleep routine is not called from within the Alarm
setup, so the clock will drain the supercapacitor via the DST and ALARM
LEDs. Wait 2-3 minutes until the LEDs are fully off. On powering up
again, you will get the cold start tube test.
Calibration of Timekeeping Accuracy
Over time you may observe the clock runs faster or slower than an
accurate time standard. You can finely adjust the timekeeping by setting
configuration parameters 20 and 21. We recommend to precisely set the
clock against a known accurate clock, and then record the time drift in
seconds after 5 full days (120 hours). Program this value into parameter
20.
Set parameter 21 to 0 to slow down the clock and to 1 to speed up the
clock.
