Technical data

Chapter 3 3-39
Adjustments and Correction Constants
Fractional-N Frequency Range Adjustment
Fractional-N Frequency Range Adjustment
This procedure centers the fractional-N VCO (voltage controlled oscillator) in its tuning
range to insure reliable operation of the instrument.
Analyzer warmup time: 30 minutes
Required Equipment and Tools
Procedure
1. Remove the right-rear bumpers and right side cover.
2. Press
.
3. Press
to observe the “FN
VCO Tun” voltage.
4. Press
to set and scale channel 1. Press to set the marker to the far right of the
graticule.
5. Press
to observe the “FN
VCO Tun” voltage.
6. Press
to set channel 2 and its marker.
7. Adjust the “FN VCO TUNE” (see Figure 3-15) with a non-metallic tool so that the
channel 1 marker is as many divisions above the reference line as the channel 2 marker
is below it. (See Figure 3-16.)
8. To fine-tune this adjustment, press
to set
“FRAC N TUNE” to 29.2 MHz.
Description HP/Agilent Part Number
Non-metallic adjustment tool 8830-0024
Antistatic wrist strap 9300-1367
Antistatic wrist strap cord 9300-0980
Static-control table mat and ground wire 9300-0797
TORX T-15 screwdriver
Preset Display
DUAL
|
QUAD SETUP DUAL CHAN ON
System
SERVICE MENU ANALOG BUS ON
Sweep Setup
NUMBER OF POINTS
11 x1
COUPLED CH OFF
Start 36 M/µ Stop 60.75 M/µ Sweep Setup
SWEEP TIME
12.5
k/m Meas
S PARAMETERS ANALOG IN Aux Input
29 x1
Format
MORE REAL
Scale Ref .6 x1
REFERENCE VALUE
−7
x1 Marker
Chan 2 Sweep Setup
CW FREQ
31.0001 M/µ
SWEEP TIME
12.375
k/m Meas
S PARAMETERS ANALOG IN Aux Input
29 x1
Format
MORE REAL
Scale Ref .2 x1
REFERENCE VALUE
6.77
x1 Marker 6 k/m
Preset Sweep Setup
CW FREQ
System
SERVICE MENU ANALOG BUS ON SERVICE MODES FRACN TUNE ON