Mhz Frequency Standard - HP 8340B Manual

A34 REFERENCE LOOP
-
M/N LOOP MOTHERBOARD
This assembly is
attached to
a
metal casting that forms an enclosed housing for the following
refer¬
ence
—
M/N
loop assemblies:
•
A29 reference phase detector assembly
•
A30100 MHz VCXO
assembly
•
A31 M/N
phase detector assembly
•
ASS M/N
output assembly
Each of these assemblies has
a
sheet metal plate attached to
it,
that completes the reference
—
M/N
enclosure.
The enclosure provides RFI (radio frequency interference)
shielding.
A51 10
MHz FREQUENCY STANDARD
This
is
a
self-contained, oven-stabilized, precision reference oscillator. The output of the
A51 fre¬
quency standard
is
sent to the A29 reference phase detector assembly through the rear panel jumper.
HP 8340B/41B
Reference Loop Theory of Operation B-3