8060A
Instruction Manual
4-4
Range
and
Function
Switches
Voltage
Divider
and
Ohms Ref
Resistors
Ohms
Source
MAC
Digital
Control
Logic
Hz, dB,
and
REL Push
Buttons
BUS
CTL
Micro-
computer
Power
Supply
Tone
A/D
Converter
Frequency
Counter
Power Supply
Ctl.
Cont.
Logic
+1.0000V
A/D Ref
True RMS
AC Converter
V/Ω/S
Ω/S
Ω/S
V
V
DC
AC
A
A
Current
Shunts
Switch Sense
Frequency (V AC)
Common
A
dx25f.eps
Figure 4-1. 8060A Block Diagram
4-3. Microcomputer
The four-bit CMOS microcomputer senses switch positions by reading status
registers in the MAC, and senses button pushes through input lines
connected directly to the microcomputer. The microcomputer processes the
information and then selects the appropriate digital and analog configuration
in the MAC by writing to an array of MAC control registers.
The operation of the instrument is controlled by software routines that are
stored in the microcomputer memory. These routines include the normal
operating routine, the power-on self-test, or special self-test routines that
may be selected by the operator. When the instrument is first turned on, the
microcomputer performs the self-test routine which checks the LCD
segments and the interface to the MAC (refer to Chapter 2 for operating
instructions). While the LCD segments are on (a minimum of 1.6 seconds),
the microcomputer exercises the bus and checks the internal registers in the
MAC to make sure it has control over them. If the microcomputer detects a
problem with the MAC interface, it stays in the self-test routine with the
LCD segments on until the problem is resolved or the instrument is turned
off.
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