10 Contents
Math Operations .............................................262
Subprogram Definition/Deletion .................... 263
Subprogram Execution Commands ................263
Looping and Branching ..................................263
Binary Programs ............................................. 263
New Multimeter Commands ...............................264
3458A BASIC Language Example Program ....... 265
Variables and Arrays ........................................... 266
Type Declarations ...........................................266
Type Conversions ........................................... 267
Using Variables ..............................................267
Arrays ............................................................. 268
General Purpose Math .........................................269
Math Operators ............................................... 270
Math Hierarchy ...............................................272
Math Errors ..................................................... 272
Making Comparisons Work ........................... 272
Subprograms ........................................................273
Writing and Loading Subprograms .....................274
Subprogram Command Types ............................. 275
Definition/Deletion Commands .....................275
Execution Commands ..................................... 277
Conditional Statements in Subprograms ............. 278
FOR...NEXT Loops ........................................ 278
WHILE Loops ................................................279
IF...THEN Branching .....................................280
Appendix A Specifications
Appendix B GPIB Commands
Introduction .........................................................303
ABORT 7 (IFC) .............................................. 304
CLEAR (DCL or SDC) ..................................304
LOCAL (GTL) ...............................................304
LOCAL LOCKOUT (LLO) ...........................305
REMOTE ........................................................305
SPOLL (Serial Poll) ....................................... 306
TRIGGER (GET) ........................................... 307
Appendix C Procedure to Lock Out Front/Rear
Terminals and Guard Terminal
Switches
Introduction .........................................................311
Tools Required ....................................................311
Procedure .............................................................311
Covers Removal Procedure ............................312
Guard Pushrod Removal Procedure ............... 314
Front/Rear Pushrod Removal Procedure ........314
Switch Cap Installation Procedure .................316
Covers Installation Procedure ........................ 318
Appendix D Optimizing Throughout and
Reading Rate
Introducing the 3458A ........................................ 321
Application Oriented Command Language ... 321
Intrinsically Slow Measurements ................... 321
Maximizing the Testing Speed ............................ 322
Program Memory ........................................... 322
State Storage .................................................. 322
Reading Analysis ........................................... 322
Task Grouping and Sequence ........................ 322
System Uptime ............................................... 323
Purpose ................................................................ 323
Topics Covered in the Product Note include: 323
DC Volts, DC Current and Resistance ................ 323
Optimizing Through the DCV Path ............... 324
DC Current ..................................................... 326
Resistance ...................................................... 326
Optimizing Through the Track-and-Hold Path
(Direct Sampling and Subsampling) .............. 328
AC Volts and AC Current ................................... 328
Analog ACV .................................................. 328
Synchronous ACV ........................................ 328
Random ACV ................................................. 328
Comparison of ACV Modes .......................... 329
AC Current ..................................................... 329
Frequency and Period .................................... 330
Optimizing the Testing Process Through Task
Allocation ............................................................ 330
Math Operations ............................................. 330
Data Storage ................................................... 330
Output Formats .............................................. 331
State Storage and Program Memory .............. 331
Measurement List ........................................... 332
A Benchmark ...................................................... 333
Benchmark Results ........................................ 334
Still Faster ...................................................... 338
Appendix E High Resolution Digitizing With the
3458A
Introduction ......................................................... 349
Speed with Resolution ......................................... 349
Digitizing Analog Signals .............................. 350
Avoiding Aliasing .......................................... 350
Choice of Two Measurement Paths .................... 351
Using the DCV Path for Direct Sampling ...... 351
Using the Track-and-Hold Path for Direct or
Sequential Sampling ...................................... 352
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