Racal Instruments 2461 User Manual page 182

User Manual 2461 Type C
Frequency Standard
The UCT requires a 10MHz frequency standard in order to function. This can be derived
from the VXI 'CLOCK10' (generated by the SLOT0 controller), from an external 10MHz
standard connected to the front panel, or from an optional internally installed TCXO or
OCXO. The default setting is 'CLK10'. A buffered version of the standard in use is
available at the front panel 'STD OUT' connector.
Internal Standard Output
Frequency:
Output Configuration
Drive Level:
Maximum Reverse Input:
(CAUTION)
Connector:
External Standard Input
Frequency:
Signal Level:
Maximum Input Level:
(CAUTION)
Input Impedance:
Coupling:
Connector:
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10MHz
LSTTL with 47Ω Series resistor.
V 2.6V min. at -400µA
OH
V 0.6V max. at 8mA
OL
The output is also capable of driving 1Vpk-pk min,
into 50Ω
Tested to ±5V without damage.
MCX female
10MHz
100mV RMS sinewave minimum, 10V RMS maximum.
10VRMS, or +15V or –15V peak..
1kΩ nominal for signals less than 1Vpk-pk decreasing to 500Ω
nominal for signals 10Vpk-pk and above.
AC
MCX female
A-23