HP 456A, Operating And Servicing Manual

Page: 3 / 24

Model 451iA
Section
Title
II
1II
GENERAL INFORMATION .
1-l. General Description .
1-2. Power Requirements.
OPERATING INSTRUCTIONS
2-1.
2-2.
2-3 .
2-4.
2-5.
2-6.
General . .
.
. . . . .
Operating Ins tructions .
Operating the P robe . .
Increasing the Sensitivity
Measurement , P recautions
Special Measuring Techniques
THEORY OF OPERATION
3-1 . Introduction
3- 2. Probe Head
3-3. Amplifier
TABLE O F
Page
1 -1
L-
L
1 -2
2-
L
2-
L
2-1
2-1
2-1
2- 1
2-4
3-1
3-1
3- 1
3- 1
Table of Contents
List of Illustrations and Tables
CONTENTS
Section Title
Page
IV MAINTENA NCE . 4- L
V
4-
L.
General . .
4-2. Cabinet Removal
4-3. Operation on 230 Volt AC
4-4. Checking the Batteries . .
4-5. Replacing the Ba tteries
4-6. Converting to AC-Opera ted Model .
4- 7. Tes t Equipment Required
4-8. Front Panel Performance Check
4-9. Trouble Localiza tion .
4-10. Sem i-Conductor Replacement
4- U. Calibration . . . .
4-12 . Frequency Response
4-1 3. Replacing the P robe Cable
REPL ACEAB LE PARTS
5-1.
5-2.
5-3.
Introduction . . .
Table of Replaceable Parts
Ordering Information
4-L
4-1
4-L
4- 1
4-1
4-3
4-3
4-3
4- 3
4-4
4-4
4-4
4-4
5-1
5-
L
5- 1
5-1
LIST O F Ill U S T RATIO NS
Number Title
L-l.
General A rrangement of Model 456A
1 -2. Model 456A AC Current Probe . . . .
1-3. Typical Change in F requency Response
2-1.
2-2.
2-3.
2-4.
2-5.
with Load Capacitanc e . . .
P robe used with
�
Mcxiel 302A
Operation
• . . . . . . . . •
Cleaning Probe Jaws . . . .
Illustrating Development of
Ground Loops
. . .
. . .
lllustrating Directional Effect of
Current Measurement . . .
Number
Title
L - 1 . Specifications . . . .
L-2.
�
Ins truments for use with 456A
00395-1
Page
L-L
1-1
1-2
2 - L
2-2
2-3
2-3
2-4
Number
Title
2-6.
3-1 .
3-2.
4- 1 .
4-2 .
4-3.
4-4.
Bucking Out Capacitive Component
of Plate Current
Equ ivalent Circuit
Feedbac k Circuit
. . .
.
Servicing Etched Circui t Boards
.
.
. .
.
Calibration and Frequency Response .
Exploded View of Probe Assembly
Schematic Diagram Model 456A
LIST O F TA BLES
Page Number Title
L-O
4-1 . Replacement
1-1 5-1. Replaceable Parts
Page
2-5
3-L
3- 1
4-0
4-2
4-5
4- 0
Page
4-4
5-2
iii