Adjustable Components; Test Equipm Ent - Agilent Technologies 4284A Service Manual

THE ADJUSTM ENTS DESCRI BED IN THIS SECTION ARE PERFORMED WITH
POWER APPLI ED AND THE PROTECTIVE COVERS REMOVED.
VOLTAGE LEVELS EXIST AT MANY POINTS AND CAN RESULT IN SERIOUS
PERSONAL I NJURY OR DEATH IF YOU COME I NTO CONTACT WITH THEM.
2-3. TEST EQU IPMENT
Table 1 -1 lists the test equipment required to perform the adjustments described in this
section . Use only calibrated test equipment when adjusting the HP 4284A. If the recom­
mended test equipment is not available, equipment whose specifications are equal to, or
surpass those of the recommended test equipment may be used.
2-4. ADJUSTABLE COMPON E NTS
Table 2-1 lists the H P 4284A's adjustable components , the name of the adjustment related to
each component, and g ives a brief description of each adjustment.
Adjustment
Adjustable
Component
A1 R 1 9 FR EQ-ADJ
A1 R52 V-ADJ
N U LL AM P
A2R 1 23
VOS ADJ
o
A2R224
A2R324 90 DEG
A3 R353 S E N S E AM P
VOS ADJ
A5 R1 1 OSC LVL
Table 2-1 . Adjustable Components
Name
Power Supply Switching Frequency Adjustment
Power Supply Output Voltage Adjustment
Nu l l Amp. DC offset Adjustment
DEG Zero Offset Adjustment (0°)
Zero Offset Adjustment (90
Sense Amp. DC Offset Adjustment
Signal Source Adjustment
2-2
DANGEROUS
Description
0 )