HP 8340B Manual page 16

4-1.
INTERNAL TIME BASE AGING RATE (Cont'd)
OSCILLOSCOPE
FREQUENCY STANDARD
^
son
FEEDTHROUQH
TERMINATION*
•T
OUTPUT
•REQUIRED
ONLY FOR OSCILLOSCOPES NOT HAVING
50 OHMS INPUT CAPABILITY
Figure 4-1.
Internal Time
Base Aging Rate Test Setup
NOTE
Be sure the
HP 8340B/41B has been connected to the AC
power
line for
30 days before beginning this test. If
the instrument
was disconnected
from the ac power line for less than 24 hours, it
only has to be connected
to AC power for 24
hours before proceeding.
Procedure
1.
Connect the equipment
as shown
in
Figure
4-1-
2.
Adjust the oscilloscope external triggering
controls for
a
stable display of the HP 8340B/41B 10
MHz
REF OUTPUT
signal.
3.
Measure
the time required for
a
phase change of
360 degrees.
Record the time (T1)
in
seconds.
T1
=
second(s)
Performance Tests
HP 8340B/41B