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OPERATING INSTRUCTIONS

Pocket Digital Multimeter

DM4A

Rotary Switch

OFF

Power off

Diode / Continuity / 
Resistance Measurement

DCV/Hz/%

DC Voltage / Frequency / 
Duty Cycle Measurement

Hz%

Frequency and 
Duty Cycle Measurement

ACV/Hz/%

AC Voltage / Frequency / 
Duty Cycle Measurement

A

A

400A

400A

Read this owners manual thoroughly before use and save.

IMPORTANT: RECEIVING INSTRUCTIONS

   

Visually inspect all components for shipping damage. If you find damage, notify the carrier at once. 
Shipping damage is NOT covered by warranty. The carrier is responsible for all repair or replacement costs resulting from damage in shipment.

1.0 DISPLAY FUNCTIONS & SYMBOLS

1.1 FUNCTIONS (Figure 1)

1. Display: Backlit 3999 Count LCD screen
2.  SELECT Button: Press to switch between Resistance, Diode, and 

Continuity measurement functions.

3.  REL Button: Press to set the current reading as a reference value 

that will be subtracted from subsequent measurement readings. 

Press again to exit this mode. This function is not available under 

Frequency and Duty Cycle measurements.

4.  Hz/% Button: Press to switch between Hz or % measurement if the 

dial is set to DCV or ACV. Pressing it will also switch between Hz and 

% when the dial is set to Hz measurement. 

5.  HOLD Button: Press to lock and hold the value currently being 

displayed. Press again to exit this mode.

6.  Rotary Switch: Turn to power the meter on and off and select the 

desired measurement function. To save battery power, turn to the 

“OFF”

 position when  

the meter is not in use. See 

“ROTARY SWITCH”

 section for function 

descriptions.

1.1  METER FUNCTIONS

Meter type:  

Auto

Display Count:  

3999

Battery:  

Requires (1) 3V CR2032 battery

Input impedance:  

10 Meg Ohm

AC Volt Ranges:  

4V, 40V, 400V, 600V, best accuracy (1.2%+3)

DC Volt Ranges:  

4V, 40V, 400V, 600V, best accuracy (1.2%+3)

Resistance Ranges:  

 400ohm, 4kohm, 40kohm, 400kohm, 4M 
ohm, 40M ohm, best accuracy (1.0%+2)

Over Range Indication:    Displayed value > 3999 or the input  

measurement range, displays OL 

Polarity Indication:  

“-” is displayed for negative polarity

Agency Approvals:  

ETL, CE (IEC/EN61010:, CAT II 600V, 

Pollution Degree 2)
Dimension:   

2.25” x 0.5” x 4.25”

Weight: 

Around 77g

Warranty Info:  

Limited lifetime warranty

1.2 DISPLAY SYMBOLS

1. 

1.8.8.8

Autorange

MAX MIN

AC
DC

 : The battery is low (<2.4V) and must be replaced immediately

2.  

1.8.8.8

Autorange

MAX MIN

AC
DC

 : Data Hold is enabled

3. 

1.8.8.8

Autorange

MAX MIN

AC
DC

 : Negative sign

4. 

REL 

: Relative Measurement is enabled.

1

4

5

2

3

4

Summary of Contents for DM4A

Page 1: ... is set to DCV or ACV Pressing it will also switch between Hz and when the dial is set to Hz measurement 5 HOLD Button Press to lock and hold the value currently being displayed Press again to exit this mode 6 Rotary Switch Turn to power the meter on and off and select the desired measurement function To save battery power turn to the OFF position when the meter is not in use See ROTARY SWITCH sec...

Page 2: ... thoroughly before use 2 0 READ FIRST IMPORTANT SAFETY INFORMATION Read this operators manual thoroughly before using this multimeter This manual is intended to provide basic information regarding this meter and to describe common test procedures which can be made with this unit Many types of appliance machinery and other electrical circuit measurements are not addressed in this manual and should ...

Page 3: ... 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 Avoid placing the meter in areas where vibration dust or dirt is present Do not store the meter in excessively hot humid or damp places This meter is a sensitive measuring device and should be treat...

Page 4: ...s potentiometers switches extension cords and fuses Note For measurements 1MΩ the meter may take a few seconds to stabilize reading This is normal for high resistance measurements When the input is not connected i e at open circuit OL will be displayed as an overrange indication 5 4 CONTINUITY To avoid damages to the Meter or to the devices under test disconnect circuit power and discharge all the...

Page 5: ...structions above to measure Hz and 6 0 BATTERY REPLACEMENT To avoid false readings which could lead to possible electric shock or personal injury replace the battery as soon as the battery indicator 8 8 MAX MIN appears 1 Disconnect the connection between the test leads and the circuit under test 2 Turn the meter power off 3 Remove the screw from the back of the meter Lift off the back cover 4 Lift...

Page 6: ...h products shall not have been altered by the distributor The distributor shall be fully responsible for any warranties the distributor makes to its purchasers which are broader or more extensive than Sperry s limited warranty Lifetime Warranty Warranty Limitation The forgoing warranties are exclusive and are in lieu of all other express and implied warranties whatsoever including but not limited ...

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