Sperry instrument DM6400 Operating Instructions Manual Download Page 3

• Set the Function Switch to an appropriate position before starting measurement.
• Firmly insert the test leads.
• Disconnect the test leads from the instrument for current measurement.
• Do not expose the instrument to the direct sun, high temperature and humidity or dewfall.
•  Be sure to power off the instrument after use. When the instrument will not be in use for a long period,  

place it in storage after removing the batteries.

•  Use only a soft cloth dampened with water or neutral detergent for cleaning the meter.  

Do not use abrasives, solvents or harsh chemicals. Allow to dry thoroughly before use.

CAUTION

Measurement categories (Over-voltage categories) 

To ensure safe operation of measuring instruments, IEC61010 establishes safety standards for various electrical environments, specified as CAT I 

through CAT IV, and called measurement categories. Higher-numbered categories correspond to electrical environments with greater momentary 

energy, so a measuring instrument designed for CAT III environments can endure greater momentary energy than one designed for CAT II.
• CAT I: Secondary electrical circuits connected to an AC electrical outlet through a transformer or similar device. 
• CAT II: Primary electrical circuits of equipment connected to an AC electrical outlet by a power cord. 
•  CAT III: Primary electrical circuits of the equipment connected directly to the distribution panel, and feeders  

from the distribution panel to outlets. 

•  CAT IV: The circuit from the service drop to the service entrance, and to the power meter and primary over  

current protection device (distribution panel).

Incoming wire

Interior wiring

CAT. III

Transformer CAT. II

CAT. I

CAT. IV

Socket

Symbols

Caution, risk of danger, refer to the operating manual before use

Caution, risk of electric shock

AC (Alternating Current)

DC (Direct current)

AC/DC Selectable (Alternating Current/Direct Current)

Earth (ground) Terminal

The equipment is protected throughout by  
double insulation or reinforced insulation

Application around and removal from hazardous  
live conductors is permitted.

Conforms to Standards of European Union

Designates the product as recyclable  

electronic waste per WEEE Directive

2.2  OPERATING INSTRUCTIONS

1.  Set the function/range switch to the proper position before making a measurement. When the voltage is not known, it MUST be 

determined that the capacity of the selected range will handle the amount of voltage in the circuit (see #3 under “For Your Safety”).

2.  Avoid placing the meter in areas where vibration, dust or dirt are present. Do not store the meter in excessively hot,  

humid or damp places. This meter is a sensitive measuring device and should be treated with the same regard as other electrical 

and electronic devices.

3. When the meter is not in use keep the meter turned off to keep the battery from discharging.
4.  When disconnecting the test leads from the unit, always grasp the leads where the input jacks meet the tester housing. Do not pull 

the leads out of the jacks by the insulated wire or transport the tester using the test leads as a carrying strap.

 5.  Do not immerse the meter in water or solvents.  

To clean the housing use a damp cloth with a minimal amount of mild soap.

NOTE: With any measurement made by this meter, there will be some fluctuation of the digital display.  

This is due to the meter’s sampling method. This unit samples at a rate of 2 times per second, thus the fluctuation of the readout.
3.0  FUNCTION BUTTONS
3.1  POWER BUTTON TURNS METER POWER ON AND OFF
3.2  HOLD BUTTON 

1. Press HOLD once to enter data hold mode to freeze the displayed value.
2. Press HOLD again to exit data hold mode and resume normal measurement mode.

3

Summary of Contents for DM6400

Page 1: ...00 Read this owner s manual thoroughly before use and save Figure 1 7 4 3 1 2 8 6 5 1 DC Volts AC Volts 2 AC Amps 3 DC Amps 4 Resistance 5 Audible Continuity Test 6 Diode Test 7 Battery testing 8 Common input jack 9 Positive input jack 10 Durable drop resistant housing ...

Page 2: ... contains warnings and safety rules which must be observed by the user to ensure safe operation of the instrument and retain it in safe condition Read through and understand the instructions contained in this manual before using the instrument Keep the manual at hand to enable quick reference whenever necessary The instrument is to be used only in its intended applications Understand and follow al...

Page 3: ...anual before use Caution risk of electric shock AC Alternating Current DC Direct current AC DC Selectable Alternating Current Direct Current Earth ground Terminal The equipment is protected throughout by double insulation or reinforced insulation Application around and removal from hazardous live conductors is permitted Conforms to Standards of European Union Designates the product as recyclable e...

Page 4: ... the break in circuit and the black test lead to the other side of the break in circuit For AC Amp measurement the polarity of the leads does not matter 7 Return power to the circuit 8 Read the amps on the display Notes When measuring AC Amps this meter displays the effective value of the sine wave mean value response When the measured current is 5 amps continuous measurement is acceptable When th...

Page 5: ...nsert the red positive test lead into the VΩ input terminal 3 Set the function switch to diode position 4 For forward voltage drop readings on any semiconductor component place the red test lead on the component s anode and place the black test lead on the component s cathode 5 Read the nearest value of the diode s forward voltage drop as displayed Notes In a circuit a good diode should still prod...

Page 6: ...over batteries fuses or test leads When a warranty claim arises the purchaser must contact Sperry Instruments If the defect comes under the terms of this limited warranty Sperry Instruments will arrange at its sole discretion one of the following options Product will be replaced The purchaser is solely responsible for determining the suitability of Sperry products for the purchaser s use or resale...

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