HP 8340B Manual page 13

4-1. INTERNAL TIME BASE AGING RATE (Cont'd)
F EEDTHROUGH
TERM INAT ION
tOMHz REF
*REOUIREO ONLY FOR OSCILLOSCOPES NOT HAVING
50 OHMS INPUT CAPABILITY
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
4-10
Performance Tests
OScILLOSCOPE
a
•
o
00
0
00.0
1
0 0
0 )0®.
0*
00*0
I
CH A EXT
INPUT TRIGGER
50fl
*
HP 8340B/41B
UNDER TEST
OUTPUT
H
Q
noon
oo
noon
cc
noon
cocA :od~ cc
00
.c 0 0 0 0 0 0
000 00000
Figure 4-1. Internal Time Base Aging Rate Test Setup
FREQUENCY STANDARD
0
II
II
NOTE
360 degrees. Record the time (Ti) in seconds.
Ti
o o
0)0
0
OUTPUT
second(s)
=
HP 8340B/41B