Chapter 2 Explanation Of Functions; System Configuration And Block Diagram; System Configuration,Block Diagram - YOKOGAWA DL7440 User Manual

Chapter 2 Explanation of Functions

2.1

System Configuration and Block Diagram

System Configuration
External
SCSI device
External clock input
External trigger input
Trigger gate input
Video signal output (VGA)
Trigger output
Device under
measurement
Block Diagram
External clock input/
external trigger input/
trigger gate input
IM 701450-01E
SCSI (optional)
Waveform data
Setup data
Built-in printer (optional)
Screen image data
Screen image print
COMP
Analog signal input,
logic signal input (optional)
Floppy disk or
Zip disk
Pre-
Multiplexer A/D
ATT AMP
CH1
CH2
CH7
CH8
LOGIC A
Buffer
LOGIC B
Buffer
Trigger
circuit
Signal Flow
The signal applied to each signal input terminal is first passed to the vertical control circuit
consisting of an attenuator (ATT) and pre-amplifier. At the attenuator and pre-amplifier, the
voltage and amplitude of each input signal is adjusted according to the settings such as the
input coupling, probe attenuation/current-to-voltage conversion ratio, V/div, and offset voltage.
The adjusted input signal is then passed to the multiplexer. The signal input to the
multiplexer is passed to the A/D converter according to the time axis and other settings.
At the A/D converter, the received voltage level is converted into digital values. The digital
data is written to the primary memory by the primary data processing circuit at the sample
rate that matches the time axis setting. The data written to the primary memory is processed
(averaged, for example) by the secondary data processing circuit and written to the
acquisition memory. The data written to the acquisition memory is converted into waveform display
data by the secondary data processing circuit, transferred to the waveform processing circuit, and
stored in the display memory. The waveforms are displayed on the LCD using the data stored in the
display memory.
USB Peripheral
interface
USB storage
Waveform data
Setup data
Screen image data
USB Peripheral
X-Y
SETUP DISPLAY FILE MISC RESET SELECT
ESC
PHASE
MEASURE CURSOR GO/NOGO MATH
interface
MENU MENU
PRINT IMAGE SAVE SHIFT
HISTORY ACQ START/STOP
VERTICAL HORIZONTAL TRIGGER
TRIG D
CH 1 SEARCH ACTION
2 PRESET ZOOM MODE
CH
CH 3 V/DIV TIME/DIV
SIMPLE ENHANCED
4
CH
DELAY
5
CH
POSITION
CH 6
7
CH LOGIC
CH 8
SNAPSHOT CLEAR TRACE HELP
Waveform data
Setup data
Waveform data
Screen image data
Setup data
Screen image data
PC card
Primary Acquisition
memory memory
Primary Secondary
data data
processing processing
circuit circuit
Time base
Input
USB mouse
Input
USB keyboard
Screen image data
USB printer
GP-IB interface
USB interface
Ethernet interface (optional)
PC
VGA video
output
Color LCD
Display
Display
processing
Built-in printer
circuit (Optional)
Keyboard
Display
memory
GP-IB
Data SCSI
(Optional)
processing
USB
memory
Peripheral
USB
CPU
FDD or
Zip drive
PC card
Ethernet
(Optional)
Trigger output
2-1
2