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FLK-8845A/SU
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Fluke FLK-8845A/SU [72/93] Measuring dc current

8845A/8846A

Users Manual

4-10

INPUT SENSE

FRONT

REAR

10 A

100

2W/4W

300V

FUSED

1000V CAT I

600V CAT II

V AC

I < 100 mA

caw025.eps

Figure 4-4. Input Connections for Current Measurements Below 120 mA

INPUT SENSE

FRONT

REAR

10 A

100

2W/4W

300V

FUSED

1000V CAT I

600V CAT II

V AC

I > 100 mA

and

10 A

caw026.eps

Figure 4-5. Input Connections for Current Measurements Above 120 mA

Refer to the “Range Keys” section in Chapter 3 of this manual for information on how to

adjust the measurement range.

Measuring DC Current

To measure dc current:

1. Connect the test leads between the Meter’s input connectors and the measured circuit

as shown in Figure 4-4 for currents 120 mA or less or Figure 4-5 for currents up to 10

amps.

2. Press H.

Содержание

A 8846a 1
A 8846a digital multimeter users manual 1
Digital multimeter 1
Users manual 1
Limited warranty and limitation of liabilit 2
Table of contents 3
A 8846a 6
List of tables 7
A 8846a 8
List of figures 9
A 8846a 10
Chapter 1 11
Introduction and specifications 11
Introduction 13
Manual set 13
About this manual 14
General safety summary 14
Safety information 14
Xw warning 14
Xw warning 15
Instrument security procedures 16
Symbols 16
Volatile memory 16
Accessories 17
Media memory 8846a only 17
Non volatile memory 17
A 8846a 18
Dimensions 19
Display 19
Environment 19
General specifications 19
Introduction and specifications general specification 19
Safety 19
Triggering 19
A 8846a 20
Dc voltage specifications 20
Electrical 20
Electrical specifications 20
Input characteristics 20
Math functions 20
Memory 20
Remote interfaces 20
Users manual 20
Warranty 20
A accuracy 21
Ac voltage specifications 21
Additional errors 21
Introduction and specifications electrical specification 21
A 8846a 22
A accuracy 22
Input characteristics 22
Users manual 22
A accuracy 23
Additional low frequency errors 23
Introduction and specifications electrical specification 23
Resistance 23
A 8846a 24
A accuracy 24
Additional ohms errors 24
Input characteristics 24
Users manual 24
Accuracy 8845a 25
Accuracy 8846a 25
Additional current errors 25
Dc current 25
Input characteristics 25
Introduction and specifications electrical specification 25
A 8846a 26
A accuracy 26
Ac current 26
Input characteristics 26
Users manual 26
A accuracy 27
A accuracy cont 27
Additional low frequency errors 27
Introduction and specifications electrical specification 27
A 8846a 28
A accuracy 28
Additional low frequency errors 28
Frequency 28
Gate time vs resolution 28
Users manual 28
Additional temperature errors 29
Capacitance 8846a only 29
Continuity 29
Introduction and specifications electrical specification 29
Temperature 8846a only 29
A 8846a 30
Diode test 30
Measurement rates 30
Users manual 30
Chapter 2 31
Preparing the meter for operation 31
Contacting fluke 33
Introduction 33
Power considerations 33
Storing and shipping the meter 33
Unpacking and inspecting the meter 33
Line power fuse 34
Replacing the fuses 34
Selecting the line voltage 34
Xw warning 34
Current input fuses 35
W warning 35
Connecting to line power 37
First verify that the line voltage selection is set to the correct position and then that the correct fuse for that line voltage is installed connect the meter to a properly grounded three prong outlet 37
To avoid shock hazard connect the factory supplied three conductor line power cord to a properly grounded power outlet do not use a two conductor adapter or extension cord this will break the protective ground connection if a two conductor power cord must be used a protective grounding wire must be connected between the ground terminal and earth ground before connecting the power cord or operating the instrument 37
Xw warning 37
Adjusting the bail 38
Installing the meter in an equipment rack 38
Turning power on 38
Xw warning 38
Cleaning the meter 39
Xw warning 39
Chapter 3 41
Front panel operation 41
Controls and indicators 43
Front panel feature descriptions 43
Introduction 43
Table 3 1 shows the meter s front panel controls and connectors 43
The meter can be controlled either by sending commands through one of its communication interfaces or by manual manipulation of its front panel controls this chapter explains the function and use of the controls and indicators located on the front and rear panels of the meter operating the meter through its computer interfaces is covered in the programmers manual 43
A 8846a 44
Display panel 44
Displays measurements as a value with measurement units and measurement statistics in both numerical and graphical format trendplot and histogram 44
Displays soft labels for soft keys f1 through f5 44
Identifies the current mode of operation local man or remote rem 44
The display panel described in table 3 2 performs the following three functions 44
6 7 8 9 46
A 8846a 46
Rear panel connectors 46
Table 3 3 indicates the connections on the rear panel and describes their use 46
Adjusting the meter s range 47
Configuring the meter for a measurement 47
Navigating the front panel menu 47
Setting the display resolution 47
Setting continuity resistance threshold and diode test parameters 48
Setting the ac signal filter 48
Setting the continuity threshold resistance 48
Enabling automatic input impedance 49
Setting the default temperature scale 8846a only 49
Setting the diode test voltage and current 49
Using the analyze functions 49
Collecting statistics on measurements 50
Reading the min max std dev and avg values 50
Starting the measurement collection 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
Auto triggering 55
Choosing a trigger source 55
Controlling trigger functions 55
External triggering 55
Setting the number of samples 56
Setting the trigger delay 56
Accessing and controlling memory 57
Storing readings in memory 57
Understanding the measurement complete signal 57
Recalling readings from memory 58
Storing meter configuration information 58
Recalling a meter configuration 59
Managing memory 60
Adjusting display brightness 61
Controlling system related operations 61
Identifying meter errors 61
Querying the firmware for revision level 61
Setting the meter s date and time 61
Checking the meter s calibration date 62
Configuring the remote interface 62
Resetting the meter s default settings 62
Chapter 4 63
Making measurements 63
Activating the secondary display 65
Introduction 65
Selecting function modifiers 65
Xw warning 65
0 0169 66
Measuring dc voltage 66
Measuring voltage 66
Measuring ac voltage 67
Measuring frequency and period 68
Making a two wire resistance measurement 69
Measuring resistance 69
Making a four wire resistance measurement 70
Measuring current 71
W caution 71
Measuring dc current 72
Measuring ac current 73
Measuring capacitance 8846a only 74
Measuring rtd temperature 8846a only 75
Checking diodes 76
Testing continuity 76
Making a triggered measurement 77
Setting a trigger delay 78
Setting number of samples per trigger 78
Setting the trigger mode 78
Connecting an external trigger 79
Monitoring the measurement complete signal 79
Appendices 81
A 2x4 test leads 83
Appendix a 83
Introduction 83
X4 test leads 83
Xw warning 83
Appendix b 85
B errors 85
Errors 85
Introduction 85
Appendix c 89
C rs 232 port connections 89
Introduction 89
Rs 232 port connections 89
Table c 1 lists the pins and related signals available through the rs 232 port 89
The meter s rs 232 control lines can be rewired to an alternate pairing instead of the rts cts control pair this alteration should be done by a trained technician at fluke service center opening the cover of the meter to make this alteration may void the meter s warranty 89
A 8846a 92

Fluke FLK-8845A/SU [72/93] Measuring dc current

Содержание

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