Agilent Technologies 53147A Assembly Level Service Manual page 73

NOTE
22
Chapter 2 Service
Calibration Procedures
The following is an example showing how a calculation of the Power
Reference Output Level is performed:
R = 200
V 0 = 170 µV or 170 x 10
V 1 = 78,107 µV or 78,107 x 10
V comp = 5.1583 V
R = previously recorded value
CalibrationFactor = 99.68%
2 V
Prf =
Note that V is eventually dropped out of the equation in the following
0
steps, because its value is very small (effectively zero).
2 (5.1583) (.078 – 0)
P rf =
0.80469 – 0.00608
=
= 1.00147 mW
Use a non-metallic, slot-type adjustment tool to adjust the setting of R98
on the main circuit board (see Figure 2-3) until P rf is between 0.988 mW
and 1.012 mW. Turn the adjustment tool counter-clockwise to increase the
power level or clockwise to decrease the power level.
Assembly Level Service Guide
Ω
–6
V
–6
2
( V – V ) + V – V
comp 1 0 0
4R (Calibration Factor)
2
+ (.000170)
4(200) (99.68%)
0.79861
=
797.44 797.44
or .078 V
2
1
2
– (0.78)
2-19