Fluke 8845A FE 8845A & 8846A Users Manual - Page 47

Front-Panel Operation

Navigating the Front-Panel Menu

3

3-7

Adjusting the Meter’s Range

The range keys, (

URV

), switch the Meter between auto and manual ranging. The

presence or absence of

MAN

in the display indicates the Meter’s range mode. All

functions utilize these keys to control the Meter’s range except continuity, diode test,

temperature (8846A only), frequency and period, which only have a single range.

Note

The secondary display’s range is always the same as that of the primary

display when the functions are the same.

Pressing

R

causes the Meter to toggle between auto and manual ranging mode. The

range, autorange selected when you enter the manual range mode, becomes the selected

range. The Meter will extinguish

MAN

when autorange is selected.

Pressing

U

or

V

causes the Meter to switch from auto to manual ranging and moves

the range up or down respectively from the range autorange had selected.

MAN

will also

appear in the display. If the input signal is greater than the selected range can measure,

the Meter displays

overload

and sends 9.9000 E+37 over the remote interface.

In autorange mode, the Meter automatically selects the next highest range when the

measured value exceeds full scale of the present range. If no higher range is available,

overload

is displayed on the primary or secondary display. The Meter automatically

selects the next lower range if the measured value drops below (11%) of full scale.

Navigating the Front-Panel Menu

The Meter uses a multilevel menu system for the selection of function parameters,

configuration, and features. Menu selection and navigation is accomplished with the front

panel’s five function keys (

12345

) and

B

key. Labeling of the

five function keys is presented across the bottom row of the display and is dependent on

which function is selected.

The following sections, “Configuring the Meter for a Measurement” and Chapter four’s

instructions on “Making Measurements”, cover the use of the Meter’s menu system.

Configuring the Meter for a Measurement

The Meter’s display resolution, reading rate, trigger, continuity threshold, diode test

current level, default temperature scale, and Resistive Temperature Detector (RTD) type

are adjustable through the Measurement Setup function.

Setting the Display Resolution

The steps for setting the Meter’s displayed resolution, varies depending on the selected

function. The dc volts, dc current and ohms functions set the resolution based on input

power line cycle (PLC). AC volts, ac current, frequency, period, capacitance and

temperature set resolution using a low, medium and high setting.

To set the Meter’s display resolution dc volts, dc current and ohms:

1.

Press

L

to see the measurement Setup menu.

2.

Press the soft key under the

DIGITS

PLC

label to reveal the resolution selection

menu.

Section	Page
8845A/8846A Digital Multimeter Users Manual	1
LIMITED WARRANTY AND LIMITATION OF LIABILIT	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
Instrument Security Procedures	16
Volatile Memory	16
Non Volatile Memory	17
Media Memory (8846A Only)	17
Accessories	17
General Specifications	19
Power	19
Dimensions	19
Display	19
Environment	19
Safety	19
EMC	19
Triggering	19
Memory	20
Math Functions	20
Electrical	20
Remote Interfaces	20
Warranty	20
Electrical Specifications	20
DC Voltage Specifications	20
Input Characteristics	20
8846A Accuracy	21
8845A Accuracy	21
Additional Errors	21
AC Voltage Specifications	21
Input Characteristics	22
8846A Accuracy	22
8845A Accuracy	23
Additional Low Frequency Errors	23
Resistance	23
Input Characteristics	24
8846A Accuracy	24
8845A Accuracy	24
Additional Ohms Errors	24
DC Current	25
Input Characteristics	25
Accuracy (8846A)	25
Accuracy (8845A)	25
Additional Current Errors	25
AC Current	26
Input Characteristics	26
8846A Accuracy	26
8845A Accuracy	27
Additional Low Frequency Errors	27
Frequency	28
8846A Accuracy	28
8845A Accuracy	28
Gate Time vs. Resolution	28
Additional Low Frequency Errors	28
Capacitance (8846A Only)	29
Temperature (8846A only)	29
Additional Temperature Errors	29
Continuity	29
Diode Test	30
Measurement Rates	30
2. Preparing the Meter for Operation	31
Introduction	33
Unpacking and Inspecting the Meter	33
Contacting Fluke	33
Storing and Shipping the Meter	33
Power Considerations	33
Selecting the Line Voltage	34
Replacing the Fuses	34
Line-Power Fuse	34
Current-Input Fuses	35
Connecting to Line Power	37
Turning Power-On	38
Adjusting the Bail	38
Installing the Meter in an Equipment Rack	38
Cleaning the Meter	39
3. Front-Panel Operation	41
Introduction	43
Controls and Indicators	43
Front-Panel Feature Descriptions	43
Display Panel	44
Rear-Panel Connectors	46
Adjusting the Meter's Range	47
Navigating the Front-Panel Menu	47
Configuring the Meter for a Measurement	47
Setting the Display Resolution	47
Setting the AC Signal Filter	48
Setting Continuity Resistance Threshold and Diode Test Parameters	48
Setting the Continuity Threshold Resistance	48
Setting the Diode Test Voltage and Current	49
Setting the Default Temperature Scale (8846A Only)	49
Enabling Automatic Input Impedance	49
Using the Analyze Functions	49
Collecting Statistics on Measurements	50
Starting the Measurement Collection	50
Reading the Min, Max, Std. Dev. and Avg. Values	50
Stopping Measurement Collection	50
Testing Using Limits	51
Setting an Offset Value	52
Using MX+B	52
Using TrendPlot	53
Using the Histogram Function	54
Controlling Trigger Functions	55
Choosing a Trigger Source	55
Auto Triggering	55
External Triggering	55
Setting the Trigger Delay	56
Setting the Number of Samples	56
Understanding the Measurement Complete Signal	57
Accessing and Controlling Memory	57
Storing Readings in Memory	57
Recalling Readings from Memory	58
Storing Meter Configuration Information	58
Recalling a Meter Configuration	59
Managing Memory	60
Controlling System-Related Operations	61
Identifying Meter Errors	61
Querying the Firmware for Revision Level	61
Adjusting Display Brightness	61
Setting the Meter's Date and Time	61
Configuring the Remote Interface	62
Checking the Meter's Calibration Date	62
Resetting the Meter's Default Settings	62
4. Making Measurements	63
Introduction	65
Selecting Function Modifiers	65
Activating the Secondary Display	65
Measuring Voltage	66
Measuring DC Voltage	66
Measuring AC Voltage	67
Measuring Frequency and Period	68
Measuring Resistance	69
Making a Two-Wire Resistance Measurement	69
Making a Four-Wire Resistance Measurement	70
Measuring Current	71
Measuring DC Current	72
Measuring AC Current	73
Measuring Capacitance (8846A only)	74
Measuring RTD Temperature (8846A only)	75
Testing Continuity	76
Checking Diodes	76
Making a Triggered Measurement	77
Setting the Trigger Mode	78
Setting a Trigger Delay	78
Setting Number of Samples per Trigger	78
Connecting an External Trigger	79
Monitoring the Measurement-Complete Signal	79
Appendices	81
A. 2X4 Test Leads	83
B. Errors	85
C. RS-232 Port Connections	89

Fluke 8845A FE 8845A & 8846A Users Manual - Page 47

Adjusting the Meter's Range, Navigating the Front-Panel Menu, Configuring the Meter for a Measurement

Page 47 highlights