HP 8642A - Page 301

Model 8642A/B
Performance Tests
PERFORMANCE TESTS
4-19. INTERNAL TIME BASE AGING RATE TEST
SPECIFICATION:
DESCRIPTION:
10 ~H2
o~
EQUIPMENT:
NOTE
This test should not be performed unless Option 001
is installed.
Eleclrical Chara;;lerislics Performance limits Conditions
Aging Rate
1
x 10-
s
/day
After eight day warm-up
(Option
001 only)
(typically
24 hrs in normal
operating environment)
The reference signal from the HP 8642 (10 MHz OUTPUT) is connected to
the oscilloscope's vertical in.Qut. A frequency standard (with long-term
stability greater than 1 x 10-
10
)
is connected to the trigger input. The time
required
for a specific phase change is measured immediately and after a
period of time. The aging rate is inversely proportional to the absolute
value of
the difference in the measured times.
o 0 0 I
10
FREQUENCY
o (1 n nn LlDDDn Dono
OSCILLOSCOPE
00 ~o~ §§ §§§§§ 0 ~o
STANDARD
HP 8642A1B
VERTICAL TR I GGER
OUTPUT
SYNTHESIZED
INPUT
SIGNAL GENERATOR
Figure 4-18, Internal Time Base Aging Rate Test Setup
Frequency Standard .................. HP 5065A
Oscilloscope ........................... HP 17 40A
4-51