Extech Instruments AN340 User Manual page 12

P40: RTC (real time clock)
1. Once in the setup mode, at the P40 RTC display, momentarily press the ENTER button to
access the P40 menu.
2. The '12H' or '24H' icon should now be shown on the display. Use the arrow buttons to
select 12H (12 hour clock) or 24H (24 hour clock). Press ENTER to confirm entry.
3. The upper display should now show RTC again and the lower display will show the date in
YY‐MM‐DD format. The 'YY' digits should be flashing. Use the arrow buttons to select the
current year and then press ENTER to confirm.
4. The 'MM' digits should now be flashing. Use the arrow buttons to select the current
month and then press ENTER to confirm.
5. The 'DD' digits should now be flashing. Use the arrow buttons to select the current day
and then press ENTER to confirm.
6. The upper display should now show RTC again and the lower display the time in HH‐MM‐
SS format. The 'HH' digits should now be flashing. Use the arrow buttons to select the
current hour and then press ENTER to confirm.
7. The 'MM' digits should be flashing. Use the arrow buttons to select the current minute
and then press ENTER to confirm.
8. The 'SS' digits should now be flashing. Use the arrow buttons to select the seconds and
then press ENTER to confirm.
9. The display should now return to the main 'P40 RTC' display.
10. Use the arrow keys to step to another parameter or press ESC to exit the SETUP mode.
P50: OFFSET (relative humidity display offset)
1. Once in the setup mode, at the P50 UNIT display, momentarily press the ENTER button to
access the P50 menu.
2. Use the arrow buttons to select the desired relative humidity offset.
3. Press ENTER to confirm the selection.
4. Use the arrow keys to step to another setup parameter or press ESC to return to the
normal operating mode.
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