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Dual Display, Primary Display, Secondary Display

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8808A Users Manual Dual Display The Meter has a 5-1/2 digit vacuum fluorescent dual display. See Figure 3-2 and Table 32 for an overview of the display annunciators and indicators The dual display is comprised of a primary display and a secondary display, which show measurement readings, annunciators and messages. The annunciators indicate measurement units and the Meter's operating configuration. The dual display allows you to see two properties for the input signal you are measuring. The Meter alternates between properties, measuring the first property and showing it on one display, and then measuring the second property and showing it on the other display. (For more detail, see the "How the Meter Takes Dual Display Measurements" section in Appendix A.) If an input exceeds the full-scale value of the selected range, the Meter displays 0Lto indicate an overload. Primary Display The primary display comprises the lower segment of the dual display, and consists of the larger digits and annunciators. The primary display shows measurements taken using the relative readings (REL), minimum maximum (MIN MAX), Touch Hold (HOLD), and decibels (dB) function modifiers. Secondary Display The secondary display comprises the upper segment of the dual display, and consists of the smaller digits and annunciators. Function modifiers REL, HOLD, MIN MAX, and dB and the manual range mode cannot be selected for the secondary display. The secondary display is either in autorange, or the same range as the primary display if both displays are in the the same function. 1 2 34 5 67 8 9 10 11 24 23 22 21 20 19 18 17 16 Figure 3-2. Display Annunciators and Indicators 12 13 14 15 eue01f.eps 3-6

Section	Page
8808A Users Manual	1
Warranty	2
Table of Contents	3
List of Tables	7
List of Figures	9
1. Introduction and Specifications	11
Introduction	13
Manual Set	13
About this Manual	14
Safety Information	14
General Safety Summary	14
Symbols	16
Options and Accessories	17
General Specifications	18
Voltage	18
Dimensions	18
Display	18
Environment	18
Safety	18
EMC	18
Triggering	18
Math Functions	18
Electrical	19
Remote Interfaces	19
Warranty	19
Electrical Specifications	19
DC Voltage Specifications	19
AC Voltage Specifications	20
Resistance	21
DC Current	21
AC Current	22
Frequency	23
Continuity	23
Diode Test	23
2. Preparing the Meter for Operation	25
Introduction	27
Unpacking and Inspecting the Meter	27
Contacting Fluke	27
Storing and Shipping the Meter	27
Power Considerations	27
Selecting the Line Voltage	28
Replacing the Fuses	28
Line-Power Fuse	28
Current-Input Fuses	29
Connecting to Line Power	31
Turning Power On	32
Adjusting the Bail	32
Installing the Meter into an Equipment Rack	32
Cleaning the Meter	33
Fluke 45 Emulation	33
Illuminating All Display Segments	34
3. Operating the Meter from the Front Panel	35
Introduction	37
Dual Display	40
Primary Display	40
Secondary Display	40
Rear Panel	42
Adjusting Meter Range	42
Selecting a Measurement Rate	43
Selecting a Measurement Function	43
Measuring Voltage	44
Measuring Frequency	44
Frequency Ranging	45
Measuring Resistance	45
2-Wire Resistance Measurement	45
4-Wire Resistance Measurement	46
Measuring Current	47
Automatic Input Terminal Detection	48
Diode / Continuity Testing	49
Making a Triggered Measurement	50
Setting the Trigger Mode	50
Connecting to an External Trigger	50
Selecting a Function Modifier	51
Relative Readings Modifier (REL)	52
Decibels and Auto Power Modifier	52
Touch Hold Function (HOLD)	53
Minimum / Maximum Modifier (MIN MAX)	54
Using the Function Modifiers in Combination	55
Second Level Operations (Using the SHIFT Button)	55
Compare Function (COMP)	56
Setting the Compare Range	56
Using the Compare Function	56
List and Number Editors	56
Using the List Editor	57
Using the Number Editor	58
Function Keys S1 - S6	58
Power-Up Configuration	59
Calibration	59
4. Operating the Meter Using the Computer Interface	61
Introduction	63
Local and Remote Operations	63
Computer Interfaces	63
Preparing the Meter for Operations via the RS-232 Interface	63
Setting Communication Parameters (RS-232)	63
RS-232 Print-Only Mode	64
Cabling the Meter to a Host or Printer (RS-232)	65
Character Echoing and Deletion	66
Device Clear Using ^C (CNTRL C)	66
RS-232 Prompts	66
Getting Started with an Installation Test	66
Installation Test for RS-232 Operation	66
If Test Fails	67
How the Meter Processes Input	67
Input Strings	67
Input Terminators	67
Sending Numeric Values to the Meter	68
Sending Command Strings to the Meter	68
How the Meter Processes Output	68
Triggering Output	69
External Triggering from the Front Panel	69
Setting the Trigger Type Configuration	70
External Trigger via the Computer Interface	70
Status Registers	71
Event Status and Event Status Enable Registers	72
Status Byte Register	74
Reading the Status Byte Register	75
Computer Interface Command Set	75
Common Commands	76
Function Commands and Queries	77
Function Modifier Commands and Queries	79
Range and Measurement Rate Commands and Queries	81
Measurement Queries	83
Compare Commands and Queries	84
Trigger Configuration Commands	84
Miscellaneous Commands and Queries	85
RS-232 Remote / Local Configurations	85
RS-232 Save / Recall System Configurations	86
Sample Program Using the RS-232 Computer Interface	87
Appendices	89
A. Applications	91

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8808A

Users Manual

3-6

Dual Display

The Meter has a 5-1/2 digit vacuum fluorescent dual display. See Figure 3-2 and Table 3-

2 for an overview of the display annunciators and indicators

The dual display is comprised of a primary display and a secondary display, which show

measurement readings, annunciators and messages. The annunciators indicate

measurement units and the Meter’s operating configuration.

The dual display allows you to see two properties for the input signal you are measuring.

The Meter alternates between properties, measuring the first property and showing it on

one display, and then measuring the second property and showing it on the other display.

(For more detail, see the “How the Meter Takes Dual Display Measurements” section in

Appendix A.)

If an input exceeds the full-scale value of the selected range, the Meter displays

indicate an overload.

Primary Display

The primary display comprises the lower segment of the dual display, and consists of the

larger digits and annunciators. The primary display shows measurements taken using the

relative readings (REL), minimum maximum (MIN MAX), Touch Hold (HOLD), and

decibels (dB) function modifiers.

Secondary Display

The secondary display comprises the upper segment of the dual display, and consists of

the smaller digits and annunciators.

Function modifiers REL, HOLD, MIN MAX, and dB and the manual range mode cannot

be selected for the secondary display. The secondary display is either in autorange, or the

same range as the primary display if both displays are in the the same function.

eue01f.eps

Figure 3-2. Display Annunciators and Indicators