HP 8642A Operation And Calibration Manual 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