HP 8340B Manual page 139

5-5. 20130 LOOP PHASE LOCK, A36, A38, A39, AND A43 (Cont'd)
Equipment
Frequency Counter
Spectrum Analyzer
Active Probe
Probe Power
Signal Generator
Low-Voltage
Digital Voltmeter (DVM)
Function Generator
BNC to SMB Snap-On Test Cable
Adapter,
Procedure
PHASE LOCK LOOP 2
If PLL2 is phase locked (UNLK annunciator not lit), proceed to step 12. If
the UNLK annunciator is lit, determine if PLL2 (N2) is phase locked as
follows: (a) Press [SHIFT] t hen [EXT],(b).
N2 is blinking, PLL2 is unlocked. With PLL2 unlocked, proceed to step 1.
If some other oscillator circuit caused the UNLK indication, proceed to
step 12.
1. Position the OUT in test position
one-half hour warm up time. Set LINE switch to STANDBY. Remove A41 PLL2 Phase Detector
from its connector on the motherboard. (It is not necessary to completely remove the
bly from the instrument).
2. Set the LINE switch to ON and press [INSTRPRESET].
3. Remove the cable from A40J3 (.15
Counter to A40J3 using a BNC to SMB snap-on test cable.
Press [CW] then enter [3] [0] [MHz] to set the N2 oscillator to 150 MHz.
4.
5. Connect the OVM to A43TP5 (VCO TUNE) located on top cover of A43.
6. Adjust A40R2 (150 MHz) for a DVM indication of +3.0 Vdc ±0.5 Vdc. Refer to Figure 5-10 for
location of adjustments.
7. Adjust A43R9 (.3 MHz) for a DVM indication of 0.300 MHz
500).
8. Press [CW] then enter [1] [9] [.] [9] [9] [9] [9] [9] [9] [MHz]to set the N2 oscillator to 100 MHz.
9. Adjust A40R4 (100 MHz) for a DVM indication of ±15.0 Vdc ±0.5 Vdc.
10. Adjust A43R41 (.2 MHz) for a frequency Counter indication of 0.200 MHz
quency divided by 500).
5-28 Adjustments
Supply
DC Power Supply
SMB Snap-On Male-to-Male
as shown in Figure 5-9 with bottom cover removed and allow
6 MHz OUT FOR AF ~.1
-
NOTE
Observe ENTRY display and if
MHz) and connect the Frequency
0.001 MHz (N2 frequency divided by
±
5343A
HP
HP 8566B
HP 1121A
HP1122A
HP 8654A
HP 6294A
HP 3456A
HP 3325A
HP 85680-60093
HP 1250-0069
A41
assem-
MHz (N2 fre-
±0.001
HP 8340B/41B