advantest corporation TR5821 - Influence of Temperature and Line Voltage Variations on S Ta B Ility

64. In flu e n c e o f T e m p era tu re a n d L in e V o lta g e V a ria tio n o n S ta b ility
Since th e re fe re nc e o sc illa to r used in th is c o u n te r is n o t te m p e ra tu re c o m p en 
sa te d , th e te m p e ra tu re rise ca u se d b y PO W E R O N an d in te rn a l te m p e ra tu re
change b y p o w e r flu c tu a tio n a ffe c t th e sta b ility o f th e re feren ce o scillato r.
Fig ure 6-2 sh ow s th e sta n d a rd valu es o f w arm -u p tim e a n d p o w er flu c tu a tio n
o f th is un it.
T h e w arm -u p tim e re q u ired (th e tim e to re ach a fre q u e n cy d e v ia tio n o f ±5
x 1 0 '7) is 2 5 m in u te s fo r th e T R 5 8 2 1 , a n d 15 m in u te s fo r th e T R 5 8 2 2 /5 8 2 3 .
x1 O'7
Tim e
Fig. 6-3 Stability of reference oscillator
6-5