Managed to download a user guide for the 5a
Here is the relevant bit. Hope it helps
a. Set Analog/Digital Switch to Digital.
b. Place unit on test pedestal and move over covered area until signal meter needle is in Red zone.
c. Set Analog/Digital Switch to Analog
d. Place units on test pedestal and move over covered area until there is a steady Pulsing of the needle on the signal meter.
Measurement of Accuracy
e. Select the units desired ,is ppm(key 20), sec/day(key 19) ,or Sec/mo(key 18)
f. Display will indicate accuracy of units selected with a “+” on the display,
meaning fast or gaining time and a”-“on the display ,meaning slow or
NOTE: For the Analog units, select the FAST test speed, DEPRESS KEY 26, and see that
indicator light 10 is lit, the signal light,9. should be on to indicate the main unit is receiving a signal.
Learning all the time.
Proud Member of Global Horology and Chapter 149