Sperry instruments DM4A User Manual

1
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

Sperry instruments DM4A Specifications

General

Display Type	LCD
Continuity	Yes
Diode Test	Yes
Battery Test	1.5V, 9V
Battery Type	9V
Safety Rating	CAT II 600V
DC Voltage	200mV/2V/20V/200V/600V
AC Voltage	200V, 600V
DC Current	200µA/2mA/20mA/200mA/10A
AC Current	10A
Resistance	200Ω, 2kΩ, 20kΩ, 200kΩ, 2MΩ

Summary

Display Functions and Symbols

Functions (Figure 1)

Describes the multimeter's buttons, display elements, and their operations.

Meter Functions

Lists key meter specifications including type, display count, battery, and measurement ranges.

Display Symbols

Explains common symbols displayed on the multimeter, such as battery low, data hold, and polarity.

Important Safety Information

Safety Warnings

Provides crucial safety rules, precautions, and hazard definitions (Danger, Warning, Caution).

Specifications

Measuring Range & Accuracy

Details the accuracy and ranges for DCV, ACV, Resistance, Continuity, Frequency, Diode, and Duty Cycle.

Auto Power Off Function

Dial Settings and Measurements

AC Volts

Instructions for measuring AC Voltage, including safety limits and typical applications.

DC Volts

Instructions for measuring DC Voltage, including safety limits and typical applications.

Resistance

Guidelines for measuring resistance, emphasizing power-off and component isolation.

Continuity

Procedures for continuity testing, including buzzer indications and safety limits.

Diode Test

Steps for testing diodes, including polarity and forward voltage drop measurement.

Frequency and Duty Cycle

How to measure frequency and duty cycle using the Hz/% function.

Battery Replacement

General Service and Maintenance

Limited Lifetime Warranty