Signal Unit A1; Description A1; Introduction - Fluke Autoranging CombiScope PM3370B Service Manual

UNIT DESCRIPTIONS
5 UNIT DESCRIPTIONS
5.1

SIGNAL UNIT A1

5.1.1

Description A1

5.1.1.1

Introduction

With the exception of the final stages, unit A1 incorporates the vertical channels, the triggering, the
time bases and the intensity (Z) control. The unit A1 description is split into the following chapters:
- Input attenuators and calibrator.
- Preamplifiers.
- Y-functions and delay line driver.
- Triggering.
- Main and delayed time base.
The complete signal unit is divided over 18 circuit diagrams. These diagrams and their main
interconnections are listed in the table.
Diagram 11 includes the circuitry that controls the functions in the vertical channels.
Diagram 18 shows the connectors that make contact with other units in the oscilloscope via the
connector board. These units are:
- The final amplifier unit A2: horizontal deflection signal and intensity control.
- The microprocessor unit A3: control signals and potentiometer functions.
- The power supply unit A6: supply voltages and line trigger signal.
Diagram Description
1,2,3,4 Attenuator ch.1,2,3,4
5 Attenuator control
6 Preamplifier ch.1,2
7 Preamplifier ch.3,4
8 Y-functions
9 Delay line driver
10 Display + trigg control
11 Control circuits
12 MTB trigger
13 TV/line trigger
14 DTB trigger
15 Time base logic
Main time base
16
17 Delayed time base
Input signal Output signal
coming from going to
input 1,2,3,4 diagr.6,7
diagr.1,2,3,4 diagr.1,2,3,4,18
diagram 1,2 diagr.8
diagram 3,4 diagr.8
diagram 6,7 diagr.9
diagram 8 delay line
diagram 18 diagr.8,9
diagram 18 diagr. 1,2,3,4,5,6,7,8
diagram 8 diagr.13,15
diagram 12,18 diagr.12,14
diagram 8 diagr.15,17
diagram 12,14 diagr.16,17,18
diagram 15 diagr.17
diagram 15 diagr.18
5.1 - 1
Control signal
coming from
diagr.5,11
diagr.11
diagr.11,18
diagr.11,18
diagr.10,11,18
diagr.10,18
diagr.18
diagr.18
diagr.12,18
diagr.12,14
diagr.14,18
diagr.15,18
diagr.18
diagr.18