Agilent Technologies 8360 L Series, Service Manual

Page: 332 / 603

14. AMAccuracy
(8360 B-Series Only)
Description and Procedure
This pro cedure consists of three adjustmen ts. Calibration constan t #277, AM Oset, is
adjusted for no c hange in RF output p o w er when AM is enabled but no v oltage is applied.
EXP AM CAL is adjusted for a 010 dB c hange in p o w er when 01.00 V is applied and AM
10 dB/V is selected. LIN AM CAL is adjusted so that a 00.80 V AM input (100%/V AM
selected) causes the RF output to decrease to 4.00% of its initial v alue.
1. T urn on the instrumen ts sho wn in Figure 3-28 and let them w arm up for at least one
hour.
2. Zero and calibrate the p o w er meter/sensor.
3. Connect the equipmen t as sho wn in Figure 3-28.
Figure 3-28. AM Accuracy Adjustment Setup
Equipment
Digital V oltmeter HP/Agielnt 3456A
F unction Generator HP/Agilent 3325A
P o w er Meter HP/Agilent 436A/7A/8A
P o w er Sensor HP/Agilent 8485A (83620B /22B/24B,
83623B /L, and 83630B /L)
P o w er Sensor HP/Agilent 8487A (83640B /L and 83650B/L)
Agilent 8360 Adjustments
AM Accuracy
3-75