HP 8340B Manual page 128

5-2. 10 MHz STANDARD ADJUSTMENT, A51
Reference
Performance Test: None
Service Section: Reference
Description
The internal 10 MHz time base is adjusted for frequency accuracy. This procedure does not adjust for
long-term drift or aging rate. It adjusts only short-term accuracy. To properly adjust the time base, a
frequency standard whose accuracy is known to be better than that of the HP 8340B/41 B Time Base
is required. Refer to Frequency Reference specifications in Section I, Table 1-1 for aging rate specifi-
cations for the internal time base. (Time base specifications for the HP 8340B and HP 8341B are the
same.)
Equipment
Oscilloscope
Frequency Standard
Procedure
Primary power must have been applied to the instrument for at least 30
days before adjusting the internal time base. If the instrument was
disconnected from ac power less than 24 hours (after it had its initial 30
day warmup), the warmup time is 24 hours before adjusting internal time
base.
HP 8340B/41B
M/N Loops
—
OSCILLOSCOPE
Figure 5-3. 10 MHz Standard Adjustment Setup
with aging rate of ±lxlO — 9/day or better such as HP 5061A
NOTE
FREQuENcY STANDARD
0 0
any 1, 2, 5, or 10 MHz Frequency Standard
0
HP 1741A
Adjustments 5-15