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7.15.2a
RealigTimenc of TCX0 frequency
(in case of an ITT TCXO):
Control se[[ings:
SUPPLY switch:
STAND BY
1. Connect the counter to Icl pin 1.
2. At apprcix. 25° C the frequency must be within ± 2 Hz of the
nominal frequency 11.2 }fflz ± the offset frequency (mrked on
the top of the metal case).
If the frequency is I]ot within these linits, the value of the re-
si.star R2 must t]e changed, generally with a lower value. A resistor
can therefore nomally be placed in parallel with R2.
7.15.2b
Realigrment of TCX0 frequency (in case of a Philips TCXO):
Control settings: SUPPLY svicch:
STAND BY
1. Connect the counter to the Icl pin 1.
2. If the frequency i§ higher than 11,200.011 Hz, the connection
indicated by the dotted line in the circuit diagram must be
introduced. (This will reduce the frequency by approx. 2 ppm).
7-9
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