Once the external 10 MHz reference is restored (on J13), the user must again manually (via the front panel LCD
or Remote M&C) reselect External Reference Mode for the external 10 MHz reference to become the ‘primary’
source.
L-band units with option E also have the ability to ‘insert’ the (internal or external) 10 MHz signal that has been
buffered (as described above) on the center pin of the L-band (RF) connector(s).
Option E1
Units with option E1 operate as described above but also have an Auto mode. When in auto mode the unit will
detect and select the external 10 MHz signal if it is present and at least +3 dBm. If the external 10 MHz signal
falls below 1 dBm (+/- 1 dB) the unit will automatically switch to the internal 10 MHz reference. The reference
out connector (J14) provides a buffered rendition of the selected 10 MHz signal at +3 dBm, +/- 3 dB.
Units with option E1 do not have the ability to insert a buffered rendition of the selected 10 MHz signal on the
center pin of the (RF) connector.
AC Fuse - 2 amp slow blow (Type T),
5 mm X 20 mm
FUSE DRAWER
SPARE FUSE
~
INPUT
100-240± 10%VAC
47-63 Hz
2A MAX
FUSE
TYPE T 2A GDC
250 VOLT
FOR 100 - 240 V~
~
Figure 2.3 Fuse Location and Spare Fuse
2017-14 Manual, Rev. 0
Page 15
01/31/13
