Hioki DT4251 User manual

Instruction Manual
June 2014 Revised edition 1 DT4251A981-01 14-06H
DT4253
DIGITAL MULTIMETER
DT4252
DT4251

i
Contents
Introduction.........................................................................1
Verifying Package Contents ..............................................1
Options (sold separately) ..................................................2
Safety Notes........................................................................5
Usage Notes......................................................................10
1 Overview 15
1.1 Overview and Features.................................15
1.2 Parts Names and Functions.........................16
1.3 Display ...........................................................22
1.4 Alarm Display and Battery Indicator ...........23
2 Preparation for Measurements 25
2.1 Measurement Workflow................................25
2.2 Inserting/Replacing Batteries ...................... 26
2.3 Using Test Leads...........................................28
2.4 Installation in Measurement Location.........31
Using the instrument with the stand.......................... 31
Attaching the strap.................................................... 31
2.5 Using the Carrying Case ..............................33
3 Performing Measurements 37
3.1 Inspection Before Use ..................................37
3.2 Measuring Voltage.........................................42
Measuring AC voltage...............................................42
Measuring DC voltage .............................................. 43
Measurement using the AC and DC automatic
judgment (DT4251DT4253) ....................................43
3.3 Measuring Frequencies ................................44
Ind.Appx.
7
6
5
4
3
2
1

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3.4 Checking Continuity .....................................45
3.5 Measuring Diode ...........................................46
3.6 Measuring Resistance ..................................47
3.7 Measuring Temperatures (DT4253)..............48
3.8 Measuring Electrostatic Capacities.............50
3.9 Measuring Current (DT4252DT4253) .........51
Measuring DC/AC..................................................... 51
3.10 Measuring AC Using Clamp-on Probe
(DT4251DT4253) ..........................................54
3.11 Checking the Electric Charge (DT4251) ......56
4 Using Instrument Conveniently 57
4.1 Selecting the Measurement Range..............57
Measuring with the auto range .................................57
Measuring with the manual range............................. 57
4.2 Retaining the Measured Value .....................58
Retaining the measured value manually (HOLD) ..... 58
Automatically retaining the measured value
when the value stabilizes.......................................... 58
4.3 Reducing the Noise (FILTER).......................61
4.4 Checking the Maximum/Minimum/Average 63
4.5 Checking the Relative Value/Performing
Zero Adjustment............................................ 64
Checking the relative value (REL) ............................ 64
Performing zero adjustment...................................... 66
4.6 Turning On the Backlight..............................67
4.7 Using the Auto Power Save (APS)...............67
4.8 Communicating with PC...............................68
4.9 Power-on Option Table .................................70
Changing the temperature display unit ..................... 72

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5 Specifications 73
5.1 General Specifications .................................73
5.2 Electrical Characteristics .............................75
5.3 Accuracy Table..............................................77
6 Maintenance and Service 87
6.1 RepairInspectionand Cleaning.................87
6.2 Troubleshooting ............................................88
6.3 Error Display..................................................91
6.4 Replacing Fuses............................................92
Appendix Appx.1
Appx. 1 RMS and Average .............................Appx.1
Ind.Appx.
7
6
5
4
3
2
1