Keithley 194 Instruction Manual page 13

SECTION 4-IEEE-488 PROGRAMMING
4-l Typical Program Flow Chart
...................................................................
4-2
4-2 IEEE-488 Connector
...........................................................................
4-3
4-3 IEEE-488 Connections
.........................................................................
4-S
4-4
IEEE-488 Connector Location..
.................................................................
4-5
4-5 Contact Assignments
..........................................................................
4-6
4-6 ASCII Data Format (GO to c-5) ................................................................
4.27
4-7
Binary Data Formats ..........................................................................
4-28
4-8 Circular Buffer ...............................................................................
4-33
4-9
UO Status Word ..............................................................................
4.37
4.IO
LJl Status Word Format .......................................................................
4.38
4.11
Data (U2) Status Word Format. ................................................................
4.39
4-12
U3-Ull
Status Word Format ...................................................................
4-39
4.13
SRQ Mask and Status Byte Format ............................................................
4.41
SECTION 5-PERFORMANCE VERIFICATION
5-l DC Verification Connections ...................................................................
5-2
5-2 Flow Chart ...................................................................................
5-2
s-3 AC Verification Connections
....................................................................
5-6
SECTION 8-PRINCIPLES OF OPERATION
64
Simplified Block Diagraln ......................................................................
h-2
6-2 Simplified Block Diagram of Analog Circuitry
...................................................
6-3
6-3 Block Diagram of AID Converter ...............................................................
6-S
6-4 A/D Converter
Timing .........................................................................
6-7
6-5 Digital Control Block Diagram .................................................................
h-10
6-6 Microcomputer Block Diagram .................................................................
h-15
6-7 Memory Map.. ..............................................................................
6.17
h-8
110BlockDiagram
...........................................................................
h-20
6-9
Power Supply Block Diagram
.................................................................
h-22
6.10
Display Board Block Diagram
.................................................................
6.24
SECTION 7-MAINTENANCE
7-1
7-2
7-3
7-4
7-5
7-6
7-7
7-8
7-9
7-10
7-11
7-12
7-13
7-14
7-15
7-16
7-17
7-18
Line Voltage Switch and Digital Supply Fuse Locations ...........................................
7-4
Model 1944 A/D Module Installation
............................................................
7-5
Calibration Procedure Flow Chart. ..............................................................
7-8
Calibration Connections ........................................................................
7-S
Frequency Compensation Adjustment Locations .................................................
7.11
AC Frequency Response Calibration Connections ................................................
7.12
Top and Bottom Cover Removal ................................................................
7.14
Circuit BoardRemoval ........................................................................
7-17
Cable Connections ............................................................................
7-19
Case Assembly ...............................................................................
7.21
Rear Panel Disassembly
.......................................................................
7-23
Front Panel Disassembly
......................................................................
7-24
Ul Status Word Format .......................................................................
7-26
Troubleshooting Flow Chart ...................................................................
7-28
Troubleshooting Block Diagram ................................................................
7-29
Fan Filter Removal ............................................................................
7-39
Z Output Blanking Level Programming. ........................................................
7-39
MovableJumper Locations ....................................................................
7.40