Model 8642A/B
Performance Tests
PERFORMANCE TESTS
4-19. INTERNAL TIME BASE AGING RATE TEST
NOTE
SPECIFICATION:
This test should not be performed unless Option 001
is installed.
Electrical Characteristics
Aging Rate
(Option 001 only)
Performance Limits
1 X 10"
9
/day
Conditions
After eight day warm-up
(typically 24 hrs in normal
operating environment)
DESCRIPTION:
The reference signal from the HP 8642 (10 MHz OUTPUT) is connected to
the oscilloscope's vertical input. A frequency standard (with long-term
stability greater than 1 x 10~
1U
) 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.
10 MHz
OUTPUT
□ D □ I
□ n □ DO DDDDD
a □ aa
□□ODD
^,-, ao iziannp
\a
□ □ a □
OSo
HP 8642A/B
SYNTHESIZED
SIGNAL GENERATOR
OSCILLOSCOPE
VERTICAL
INPUT
FREQUENCY
STANDARD
TRIGGEH
Figure 4-18. Internal Time Base Aging Rate Test Setup
EQUIPMENT: Frequency Standard HP 5065A
Oscilloscope HP 1740A
4-51
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