DDM350 Pen-Type Digital Multimeter User s Manual

DDM350 Pen-Type Digital Multimeter User s Manual

CONTENTS LIMITED WARRANTY AND LIMITATION OF LIABILITY....1 Out of the Box...1 Accessories......2 Safety Information...2 Safety Symbols...3 Certification......4 INTRODUCTION...4 Overview...4 Buttons and Components...4 Display Description......6 USING THE METER......7 Preparation...7 DC/AC Voltage Measurement......7 DC/AC Current Measurement......8 Resistance Measurement......9 Diode Test...9 CONTENTS Capacitance Measurement....10 Continuity......10 Frequency/Duty Cycle......11 Data Hold...12 Backlight...12 Work light......12 NCV (Non-Contact Voltage)....12 Auto Off....12 SPECIFICATIONS...... 13 General Specification...13 Technical Specification...14 MAINTENANCE AND REPAIR......18 Repair......18 Test Leads Replacement...18 Replacing the batteries...18 CONTACT DAWSON......19

LIMITED WARRANTY AND LIMITATION OF LIABILITY This instrument from Dawson Tools Inc. will be free from defects in workmanship and material for three years from the date of original purchase.this warranty does not cover defects resulting from damage caused by the user such as drops, neglect, misuse, unauthorized alteration, usage outside of specified conditions, contamination, or improper repair/ maintenance.to receive service on the instrument if it becomes necessary during the warranty period, contact your nearest Dawson authorized service center at (800) 898-6991 or visit www.dawsontools.com to obtain a return authorization (within the US only). A return authorization is necessary before returning any instrument to Dawson; no service will be provided without a return authorization.the user is responsible for properly packing the unit and charges such as shipping, freight and insurance charges.the extent of Dawson's liability is limited solely to the repair/ replacement of the instrument.the above warranty in its entirety is inclusive and no other warranties, written or oral, are expressed or implied. Out of the Box Check the meter and accessories thoroughly before using the meter. Contact your local distributor if the meter or any components are damaged or malfunction. Accessories 1 2 3 4 Test Lead Alligator Clip & cable 1.5V AAA Battery Case 1 pcs 1 pcs 2 pcs 1 pcs 5 User s Manual 1 pcs Safety Information To reduce the risk of fire, electrical shock, product damage or personal injury, please follow the safety instructions described in the user s manual. read the manual before using the meter. To ensure safe operation and life of the meter, do not place the meter in any environment with high pressure, high temperature, dust, explosive gas or vapor. 1.Avoid shaking, dropping or any kind of impacts when using or transporting the meter. 2.To avoid electric shock or personal injury, repairs or servicing not covered in this manual should be performed only by qualified personnel. 3.Avoid direct exposure to sunlight to ensure extended life of the meter. 4.Do not place meter in a strong magnetic field; this may cause false readings. 5.Use only the batteries indicated in the Technical Spec. 01 02

6.Avoid exposing batteries to humidity. Replace batteries as soon as the low battery indicator appears. 7.Please keep the original packing for future shipping purposes (ex. Calibration) 8.After opening the box, check for any damage during delivery. Safety Symbols CATIII CE Important safety information, please refer to the user s manual Earth ground Indicates compliance with requirements for double insulation Fuse must be replaced with ratings specified in the manual. Conforms to IEC1010-1 standards for overvoltage in category III installations with a pollution degree of II. Complies with European Union (EU) standards Complies with U.S. and Canadian safety standards. Important Safety Information Never use the meter to measure voltages that might exceed 600V DC/AC above earth ground in category III installations. Always be careful when working with voltage above 60V DC or 30VAC RMS. Keep fingers behind the probe barriers while measuring. Inspect test leads and probes for cracks, breaks or crazes on the insulation before using the meter. Repair or maintenance should be implemented by trained personnel only. Certification CAT I II:This meter has met IEC1010-1 standard with an overvoltage category (CAT III) and pollution degree of 2. The meter complies to EMC requirements. Introduction Overview The DDM350 is a portable pen-type digital multimeter featuring DC/AC voltage and current measurements, resistance, capacitance, continuity, diode testing, frequency and duty cycle, auto/manual range, worklight, and an LCD w/backlight for easy reading. The slim and lightweight design is mobile and ideal for both professionals and hobbyists. Figures and Components Buttons and Components 1.Test Probe (+) 2.Probe Cap 3.NCV Indicator 4.Protective Ring 5.LCD Display 6.Rotary Switch 7.FUNC (Function) Button 8.RAN () Button 9. (Work light) Button 10.NCV (Non-Contact Voltage) Button 11.H/ (Hold/Backlight) Button 12.Hz/% (Frequency/Duty Cycle) Button 13.COM Jack (-) 03 04

Display Description 1 2 3 4 5 6 7 8 9 10 11 12 13 Buttons and Components Description FUNC Button RAN Button COM Button NCV Button H/ Button Hz/% Button Probe Cap Switch between AC/DC or between resistance, continuity, diode or capacitance Choose auto or manual range Hold to turn on the work light Hold to activate Non-Contact Voltage measurement Hold data reading/turn on/off backlight Switch between frequency/duty cycle functions Rotary Switch Select different functions Probe + Input for V/A/Ω/ / / /Hz/% Common terminal Protective cap to be used when making CAT III or above measurements Protective Ring Keep hand behind the ring for safety AC Alternating Current DC Direct Current % Duty Cycle Hz Frequency C F Celsius/Fahrenheit n,µ,m,k,m nano, micro, milli, kilo, mega Ω Ohms (resistance) F Farad (capacitance) A Ampere (current) V Volt (voltage) Diode Buzzer Data hold AUTO Auto range Low battery indicator 05 06

Using the Meter Preparation Select a function and a range for the item to be measured using the rotary switch and RAN button if necessary. In manual range if the range to be measured is unknown, start with the highest range. In manual range, OL is displayed when overload occurs. Choose a higher range. To perform measurement, first connect the test lead to common (COM) input then connect the probe tip of the Meter to the circuit to be tested. If the battery voltage is less than 2.4V, is displayed. Please change the batteries. DC/AC Voltage Measurement Use caution when measureing high voltage circuits to avoid electrical shock and injury. do not test voltages higher than dc/ac 600v. Make sure the probe cap is screwed on if making CAT III or higher measurements. Insert the black test lead or lead with test clip in the COM jack. Set the rotary switch to the V position. Press the FUNC button to switch between DC and AC measurements. Manual range can be selected by pressing the RAN button. Hold RAN to go back to Auto range. Connect the probe tip of the meter and tip of the test lead (or test clip) across the voltage source or load. Read the measurement on the display. The polarity of the meter s + probe will be indicated. NOTE: At small voltage ranges the meter may show unsteady readings when test leads are not connected to the circuit, this is normal because of the sensitivity of the meter. When the meter is connected to the circuit, true readings will be displayed. DC/AC Current Measurement Use caution when measureing high voltage circuits to avoid electrical shock and injury. do not test voltages higher than dc/ac 600v. Make sure the probe cap is screwed on if making CAT III or higher measurements. Insert the black test lead or lead with test clip in the COM jack. Set the rotary switch to the ma position. Press the FUNC button to switch between DC and AC measurements. Manual range can be selected by pressing the RAN button. Hold RAN to go back to Auto range. Connect the probe tip of the meter and tip of the test lead (or test clip) across the power source or load. Read the measurement on the display. The polarity of the meter s + probe will be indicated. 07 08

Resistance Measurement To avoid electrical shock and injury, power off the circuit and discharge the capacitance before measuring resistance. Insert the black test lead or lead with test clip in the COM jack. Set the rotary switch to the Ω position. Manual range can be chosen by pressing the RAN button. Hold RAN to go back to Auto range. Connect the probe tip of the meter and tip of the test lead (or test clip) across the resistance or circuit under measurement and read the measured value on the display. NOTE: The meter may take a few seconds to reach steady reading if the measured resistance is above 1MΩ. When the input is not connected (i.e. an open circuit) OL will be displayed. Diode Test Insert the black test lead or test clip in the COM jack. Set the rotary switch to the position. Press FUNC to choose diode measurement; is displayed. Connect the probe tip of the meter and tip of the test lead (or test clip) across the diode under measurement and read the measured value on the display. NOTE: The Meter shows the forward voltage drop. If the lead connection is reversed, OL is displayed. Capacitance Measurement To avoid electrical shock and injury, power off the circuit and discharge the capacitance before measuring capacitacne. Insert the black test lead or lead with test clip in the COM jack. Set the rotary switch to the position.press FUNC twice to choose capacitance measurement.there is no manual range available in capacitance mode. Connect the probe tip of the meter and tip of the test lead (or test clip) across the capacitance or circuit under measurement and read the measured value on the display. NOTE: The meter may take a few seconds to reach steadyeading when making high capacitance measurements. Continuity To avoid electrical shock and injury power off the circuit and discharge the capacitance before measuring continuity. Insert the black test lead or lead with test clip in the COM jack. Set the rotary switch to the position. Press FUNC 3 times to choose continuity test; is displayed. Connect leads to the circuit terminals. If continuity exists (i.e. resistance is less than 50Ω), the built-in buzzer will sound. 09 10

If the result is an open circuit (or the measured circuit resistance is higher than 200Ω) 0L is displayed. Frequency/Duty Cycle Use caution when measureing high voltage circuits to avoid electrical shock and injury. do not test voltages higher than dc/ac 600v. Make sure the probe cap is screwed on if making CAT III or higher measurements. Insert the black test lead or test clip in the COM jack. Set the rotary switch to the Hz% position; Hz is displayed. Connect the probe tip of the meter and tip of the test lead (or test clip) across the source or load for measurement and read the measured frequency on the display. Press Hz% to switch to duty cycle measurement; % is displayed. Connect the probe tip of the meter and tip of the test lead (or test clip) across the source or load for measurement and read the measured duty cycle on the display. Alternatively, while in AC voltage or AC current modes, pressing the Hz% button will switch to frequency mode.press the button again to switch to duty cycle. Press the button a third time to return to voltage/current mode. Data Hold To hold a reading, press the / button and the current reading will be held on the display. Press the button again to return to normal reading. Backlight Hold the / button for two seconds to turn on backlight. The backlight will go off automatically after 10 seconds. Hold the / button again to manual turn off the backlight. Work light While the meter is on in any position, hold the button to turn on the work light.use this in areas that are poorly illuminated to make measurements easier. NCV (Non-Contact Voltage) While the meter is on in any position, hold the NCV button to turn check for the presence of voltage. Move the top of the meter toward the voltage source and if the voltage detected is >110VAC, the meter will beep and the NCV indicator will flash. NOTE: Do not rely solely on NCV detection to determine the presence of voltage in a conductor.socket design, insulation, interference, etc. can affect detection. Auto Off When not in use, the Meter will automatically turn off after approx. 15 minutes. After auto off, press FUNC to turn the power back on. The Meter will beep 5 times 1 minute before and a long beep right as it turns off. Hold the FUNC button while turning on the meter to disable auto off. 11 12

Specifications General Specifications Environment Conditions Pollution Degree 2 Maximum Operating Altitude Operating Temperature Storage Temperature Max. Voltage Between Terminals And Earth Ground Auto s and Manual Display 600V CAT. III 7000 Ft (2000m) 0~40 C, 32 F~122 F (<80% RH, <10 non-condensing) 20mm LCD Max. Display Value 3999 (3 3/4 digit display) Polarity Indication: - indicates negative polarity. Overrange Indication Display shows OL. Sampling Time Unit Display approx. 0.4 second Displays function and measured value. Low Battery Indication displayed Fuse Protection: -10~50 C, 14 F~122 F (<70% RH, battery removed) 600V DC or AC FF400mA/600V Auto power off time 15 min. Power Supply 1.5V 2 AAA battery. Dimension Weight Technical Specifications DC voltage 400mV 4V 40V 400V 600V Resolution 0.1mV 0.001V 0.01V 0.1V 1V 8.9x1.6x1.4 in. (227 40 35mm) approx. 4.48oz (127g) including battery sss ±(0.5% reading + 3 digits) - Input Impedance: 10MΩ - Overload Protection: 400mV range: 250V DC or AC rms 4V to 600V ranges: DC 600V or AC 600V rms - Max. Input Voltage: 600V DC 13 14

AC voltage Resolution 400mV 4V 40V 400V 600V 0.1mV 0.001V 0.01V 0.1V 1V ±(0.8% reading + 3 digits) ±(0.8% reading + 3 digits) ±(1.0% reading + 3 digits) - Input Impedance: 10MΩ - Overload Protection: 400mV range: 250V DC or AC rms 4V to 600V ranges: DC 600V or AC 600V rms. - Frequency range: 40 to 400hz - Response: True RMS - Maximum input voltage: 600V AC rms DC Current Resolution 40mA 0.01mA ±(1.5% reading + 3 digits) 400mA 0. 1 ma - Overload protection: resettable fuse 400mA/600V AC Current Resolution 40mA 0.01mA ±(2.0% reading + 3 digits) 400mA 0. 1 ma - Overload protection: resettable fuse 400mA/600V - Frequency : 40 to 400Hz - Response: True RMS Resistance 400Ω 4kΩ 40kΩ 400kΩ 4MΩ 40MΩ Resolution 0.1Ω 0.001kΩ 0.01kΩ 0.1kΩ 0.001MΩ 0.01MΩ Resolution 0.001V Function ±(1.0% reading + 3 digits) ±(1.0% reading + 1 digits) ±(1.0% reading + 5 digits) - Open circuit voltage:1.0v - Overload protection: 250V DC or AC (RMS) Diode Function Displays diode forward voltage - Forward DC Current: 1mA - Reversed DC Voltage: 3.2V - Overload Protection: 250V DC or RMS AC Continuity If resistance is lower than 50Ω, the built in buzzer will sound. - Open circuit voltage: 1.0V - Overload Protection: 250V DC or RMS AC 15 16

Frequency/Duty Cycle Function Hz % 0-10MHz 1-99% ±(0.5% reading + 3 digits) ±(3.0% reading + 3 digits) - Overload Protection: 250V DC or AC RMS Capacitance 4nF 40nF 400nF 4µF 40µF 400µF 4mF 40mF Resolution 0.001nF 0.01nF 0.1nF 1nF 0.01µF 0.1µF 1µF 0.01µF ±(4.0% reading + 10 digits) - Overload Protection: 250V DC or AC RMS Maintenance and Repair Repair Please follow these steps closely if the meter is not functioning properly: Check the batteries; replace with new batteries if low battery indicator appears. Follow the user s manual to confirm all procedures. Before sending the meter back for repair, include a description of the problems encountered. Remove batteries and pack the meter well to avoid damage during delivery; Dawson does not cover damage due to delivery. Repair or service not covered in this manual should be performed only by the authorized service center or qualified personnel. Test Leads Replacement Replace the test leads with identical or compatible leads. lead spec:600v 10A. Replace new leads if the current leads are worn or damaged. Replacing the batteries Follow these steps to replace the batteries: Turn off the meter. Loosen the battery cover and remove the cover from the case s bottom. Remove the batteries and replace them with new ones. Re-attach the battery cover to the case s bottom and tighten the screw. 17 18

Contact Dawson Dawson Tools, Inc. 1142 S. Diamond Bar Blvd., #858 Diamond Bar, CA 91765 Phone: (310) 728-6220 www.dawsontools,com Features True RMS LCD Display Auto and Manual Auto Power Off Diode Test Audible Continuity Non-Contact Voltage Detection Work light Backlight Data Hold Low Battery Indicator 19 00-05-3544