Agilent Technologies 83620A - Page 79

Frequency
c
hanges
due
either
to
a
c
hange
in
orien
tation
with
resp
ect
to
the
earth's
magnetic
eld,
or
to
a
c
hange
in
altitude,
usually
go
aw
ay
when the
instrumen
t
is
returned to
its original
position.
A frequency
c
hange
due
to
mechanical
sho
c
k
usually
app
ears
as
a
xed
frequency
error.
1.
Connect
the
equipmen
t
as
sho
wn
in
Figure
2-1.
Preset all
instruments
and
let
them w
arm up
for at
least one
hour.
Note
If the
oscilloscop e
do
es
not
ha
v
e
a
50
input
imp
edance,
connect
c
hannel
1
through
a
50
feedthrough.
Figure
2-1. Internal
Timebase: Aging
Rate
T
est
Setup
Equipment
Digitizing Oscilloscope
HP 54111D
Frequency Standard
HP 5061A
HP 8360 Performance Tests
Internal Timebase: Aging Rate
2-9
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