Epson RX4111CE - Reference Information; Reference Data

11. Reference information

RX4111CE Jump to Top / Bottom
ETM62E-02 Seiko Epson Corporation 16

11.1. Reference Data
(1)Example of frequency and temperature characteristics
-150
-100
-50
0
-50
0
50
100
Temperature [C]
Frequency
f
T
 10
-6
T = +25 C Typ.
 = -0.035  10
-6
Typ.
[Finding the frequency stability]
1.Frequency and temperature characteristics can be
approximated using the following equations.

fT=

(

T

X)
2


fT : Frequency deviation in any temperature


 [1/

C
2
] : Coefficient of secondary temperature
(0.0350.005)10
6
/

C
2


T[

C] : Ultimate temperature(+255

C)


X[

C] : Any temperature
2.To determine overall clock accuracy, add the
frequency precision and voltage characteristics.

f/f=

f/fo+

fT+

fV


f/f : Clock accuracy (stable frequency)
in any temperature and voltage.


f/fo : Frequency precision


fT : Frequency deviation in any temperature.


fV : Frequency deviation in any voltage.
3.How to find the date difference
Date Difference =

f/f

86400 (Sec)
 For example:

f/f = 11.57410
-6
is an error of
approximately 1 second/day.
Figure 18 Frequency vs Temperature characteristics
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