100 Mhz Voltage-Controlled Crystal Oscillator (Vcxo), A30 - HP 8340B Manual

5-3. 100 MHz VOLTAGE-CONTROLLED CRYSTAL OSCILLATOR (VCXO),
A30
Reference
Performance Test: None
Service Section: Reference
Description
The open loop frequency and maximum power output of the 100 MHz VCXO is centered around 100
MHz. The 400 MHz signal is adjusted for maximum 400 MHz output with minimum spurious output.
The 400 MHz output is set to —10 dBm by selecting proper resistor values for the attenuator network
A30R67, R68, and R69.
SPECTRUM ANALYZER
Equipment
Spectrum Analyzer
Digital Voltmeter
Low-Voltage DC Power Supply
BNC to SMB Snap-On Test Cable (2 required)
Adapter, SMB Snap-On Male-to-Male
Procedure
Position OUT into the Test Position as shown in Figure 5-5 with the bottom cover removed. On the
1.
OUT's rear panel, disconnect the BNC cable connected between NT and EXT Frequency Stan-
dard connectors, set
Spectrum Analyzer's Frequency Reference
ment to warm up for one-half hour.
HP 8340B/41B
Loops
— M/N
DIGITAL VOLTMETER
o ~
~
0
00
0
0± ~=0
~,
~Efl0fl
Z~S
= ~ '—00000fl L
~ 00 EZ0UEJ~
oe-e0.~
1~
FREQUENCY
INPUT
REF ERENCE
110MHZ)
(REAR PANEL)
1%~~
ADAPTER
Figure 5-5. 100 MHz VCXO Adjustment Setup
NT/EXT switch to EXT, then connect a BNC cable from EXT connector to
LOW VOLTAGE
POWER SUPPLY
• ~
~ o ~
o ~.~
A3OTP I (TUNE)
2
2
O~ 0 fl~
A3OJ 2
U.
2
2~Q.
A3OWI
C
p 02~0
~
I
EXT FRED
0
STANDARD
(REAR PANEL)
MHz) rear-panel connector.
(10
DUT
S
u.n.
n~n~
~. ~
UDnO
HP 8566B
HP 3456A
HP 6294A
HP P/N 85680-60093
HP P/N 1250-0069
Allow the test equip-
Adjustments 5-19