On 3/3/13 9:12 AM, EB4APL wrote:
When LCD wristwatches became common in the seventies we, in the frequency and timing group of a space tracking facility, investigated the possibility of adjusting our new watches against our standard. We found that a a small copper plate, about 1 X 2 cm, resting against the display and connected to a scope probe was able to pick up enough 32 KHz energy to be displayed in the scope. Then connected the vertical output to an HP 5245L counter referenced to our standard and set the gate time to 10 seconds and got the frequency. We learned that the watch had to be worn in order to operate at the right temperature, the body acting as an oven, so you has to wear it backside in order to access the trimmer (yes, at that time those watches had and adjusting trimmer, maybe heritage from the mechanical ones, laser trimming arrived later). Our group became very popular and busy adjusting every watch our colleagues bought to a few seconds per month.
yes.. adjusting your watch to a Hydrogen Maser.. there's a time-nut-y activity...
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