5-3
Figure 5-1
Model 6517A overall block diagram
Input
Preamp
and
Prescaler
Scanner Output
Scanner
Inputs
Scanner
Option
Voltage Source
Scanner Control Out
Control
A/D
Converter
CLK
DATA
STB
TRG
O
P
T
O
I
S
O
Hardware
Trigger
Trigger
Select
Logic
ADC Data In
CLK
DATA
STB
Control
Data Out
Trigger
Delay
Software
Trigger
External Trigger,
Meter Complete,
Trigger Bus
4
8
Digital I/O
68302
Front Panel Reset
Front Panel Clock
Front Panel Data Out
Front Panel Data In
IEEE
Data
In (ISR)
GPIB
IEEE-488 Bus
Front
Panel
Controller
5 Vdc
ADC Data In
Digital
IEEE
Data Out
(DMA)
Preamp Out
V-Source
Out