Fluke 2620A - Page 5

Contents (continued)
iii
Autoprint: Computer Interface Control.................................................... 4-5
Autoprint: Output Format......................................................................... 4-5
Memory Storage: Computer Interface Control......................................... 4-6
Memory Retrieval..................................................................................... 4-6
Memory Full Operation............................................................................ 4-7
Clearing Memory...................................................................................... 4-7
Cabling the Instrument to a Host or Printer (RS-232) .................................. 4-7
Installation Test............................................................................................. 4-8
RS-232 Information....................................................................................... 4-8
Character Echoing .................................................................................... 4-8
Character Deletion.................................................................................... 4-8
Device Clear Using Ctrl C........................................................................ 4-8
RS-232 Prompts........................................................................................ 4-9
Sample Program Using the RS-232 Computer Interface .............................. 4-9
Using the IEEE-488 Interface............................................................................ 4-9
IEEE-488 Operating Limitations .................................................................. 4-9
Installing the IEEE-488 Interface.................................................................. 4-9
Enabling the IEEE-488 Interface .................................................................. 4-12
Installation Test............................................................................................. 4-13
General Information (RS-232 and IEEE-488)................................................... 4-13
How the Instrument Processes Input............................................................. 4-13
Input Strings.............................................................................................. 4-14
Input Terminators ..................................................................................... 4-14
Typical Input Strings ................................................................................ 4-14
Sending Numeric Values to the Instrument (RS-232 and IEEE-488) ...... 4-16
Sending Input Strings to the Instrument ................................................... 4-16
How the Instrument Processes Output.......................................................... 4-16
Service Requests (IEEE-488 only) and Status Registers.............................. 4-17
Event Status and Event Status Enable Registers ...................................... 4-19
Status Byte Register.................................................................................. 4-19
Reading the Status Byte Register ............................................................. 4-20
Service Request Enable Register.............................................................. 4-21
Instrument Event Register ........................................................................ 4-21
Computer Interface Command Set.................................................................... 4-22
5 Additional Considerations ................................................................ 5-1
Introduction ....................................................................................................... 5-3
Measurement Rate............................................................................................. 5-3
Advanced Trigger Mechanisms......................................................................... 5-3
Front Panel Trigger Control.......................................................................... 5-3
Computer Interface Trigger Control ............................................................. 5-3
Both External and Monitor Alarms Disabled (Type 0) ................................ 5-4
External Trigger Enabled (Type 1)............................................................... 5-4
Monitor Alarm Enabled (Type 2) ................................................................. 5-6
Thermal Voltages .............................................................................................. 5-6
When Measuring Resistance or Temperature (RTD)........................................ 5-6
True RMS Measurements.................................................................................. 5-8
Effects of Internal Noise in AC Measurements............................................ 5-8
Waveform Comparison (True RMS vs Average Responding) ..................... 5-8
Making Mixed Measurements........................................................................... 5-9
Using Shielded Wiring...................................................................................... 5-11
General Rule ................................................................................................. 5-11
Alternate Suggestions ................................................................................... 5-11
Non-Isolated Sensor Configuration.......................................................... 5-11