HP 8340B Manual page 227

5-3.
100 MHz VOLTAGE-CONTROLLED CRYSTAL OSCILLATOR (VCXO),
A30 (Cont'd)
19.
Check the
level
of the 100
MHz harmonics as displayed on the Spectrum Analyzer. Harmonics
at
100,300,500,
600, 700, and 900
MHz
must be greater than 40 dB down from the
400 MHz
signal.
Harmonics at
200 MHz
must be greater than 25 dB down from the 400 MHz
signal.
Harmonics
at
800
MHz must be greater than
15 dB down
from the
400 MHz
signal.
If not,
repeat step
15.
Table 5-5.
Selection Chart/or
Attenuator Resistors
Attenuation
(dB)
0
1
2
3
4
5
6
7
8
9
NOTE
HP Part
Numbers for resistors may be found in Table
5-5.
Resistors (Ohms)
R67
Open
825
422
261
215
178
162
133
121
110
R68
Short
6.8
12.1
17.8
23.7
31.6
38.3
46.4
51.1
61.9
R69
Open
825
422
261
215
178
162
133
121
110
20. Set the
DUT's LINE
switch to STANDBY. Disconnect
equipment
from the
DUT and reconnect
the
two
cables. Disconnect the
10
MHz Frequency Standard cable at the rear of the DUT, reconnect
jumper cabled between INT
and EXT, and set switch to INT. Set
the DUT's LINE switch to ON.
Adjustments
HP 8340B/41B