Cen Tech Multimeter 61593 Manual

The Cen Tech 61593 is a digital multimeter designed for measuring AC/DC voltage, DC current, resistance, and continuity. It features a large LCD display, overload protection, data hold function, and auto power-off. Suitable for basic electrical testing, automotive diagnostics, and home use. Below are key sections for safety, features, operation, measurement procedures, maintenance, and troubleshooting.

1. Features at a Glance 2. Safety Precautions 3. Parts Identification 4. Specifications 5. Measurement Procedures 6. Battery Replacement 7. Maintenance & Care 8. Regulatory Information 9. Troubleshooting

Features at a Glance

Key components: LCD display, rotary function switch, test lead jacks, data hold button, power button.

Feature	Description
LCD Display	3½ digit, 2000 count display with backlight
Measurement Functions	AC/DC voltage, DC current, resistance, continuity, diode test
Overload Protection	Fused current inputs; overload protection on voltage/resistance
Data Hold	Freezes display reading for recording
Auto Power-Off	Conserves battery after 15 minutes of inactivity
Test Leads	Includes red and black insulated test leads
Continuity Buzzer	Audible tone for continuity testing
Diode Test	Tests semiconductor junctions
Low Battery Indicator	Displays battery symbol when power is low
Carrying Case	Protective case for storage and transport

Safety Precautions

Read all safety information before use. Failure to follow may result in injury or damage.

Do not use if meter or test leads are damaged.
Do not measure voltage above 600V AC/DC.
Use proper terminals, function, and range for measurements.
Disconnect test leads from circuit before changing function.
Replace battery and fuse with identical type and rating.

WARNING! Risk of electric shock. Do not use on electrically live circuits unless trained. Ensure hands, shoes, and work area are dry.

Parts Identification

Front panel layout and controls.

LCD Display: Shows measurement values, symbols, and units.
Rotary Switch: Selects measurement function and range.
COM Jack: Common (black) test lead input for all measurements.
VΩmA Jack: Red test lead input for voltage, resistance, and current up to 200mA.
10ADC Jack: Red test lead input for DC current up to 10A.
Data Hold Button (HOLD): Press to freeze display reading.
Power Button (POWER): Turns meter on/off.

CAUTION! Always insert test leads into correct jacks for measurement type to prevent damage.

Specifications

DC Voltage: 200mV/2V/20V/200V/600V, ±(0.5%+2 digits)
AC Voltage: 200V/600V, ±(1.2%+5 digits)
DC Current: 200µA/2mA/20mA/200mA/10A, ±(1.0%+2 digits)
Resistance: 200Ω/2kΩ/20kΩ/200kΩ/2MΩ/20MΩ, ±(0.8%+2 digits)
Continuity: Audible buzzer if resistance < 50Ω
Diode Test: Test current 1mA, open circuit voltage 2.8V
Display: 3½ digit LCD, max 1999 counts
Power Supply: 9V battery (included)
Operating Temp: 0°C to 40°C (32°F to 104°F)
Dimensions: 126mm x 70mm x 26mm (5" x 2.75" x 1")

Measurement Procedures

Turn rotary switch to desired function. Connect test leads to proper jacks.

Measuring DC Voltage: Set switch to DCV range. Connect black lead to COM, red to VΩmA. Touch probes to circuit. If polarity reversed, "-" displays.

Measuring AC Voltage: Set switch to ACV 600V or 200V. Connect leads as above. Touch probes to circuit.

Measuring Resistance: Set switch to Ω. Ensure circuit is de-energized. Connect leads across component.

Continuity Test: Set switch to continuity symbol. Connect leads across circuit. Buzzer sounds if resistance < 50Ω.

Diode Test: Set switch to diode symbol. Connect red lead to anode, black to cathode. Forward voltage drop displays (0.5V-0.8V for silicon).

Measuring DC Current: For <200mA: set switch to DCA, red lead in VΩmA jack. For up to 10A: set to 10A, red lead in 10ADC jack. Connect meter in series with circuit.

Data Hold: Press HOLD to freeze reading. Press again to resume.

Battery Replacement

Replace 9V battery when low battery symbol appears.

Turn meter off and disconnect test leads.
Remove screw from battery compartment cover.
Replace old battery with new 9V battery (type 6F22).
Replace cover and screw.
Properly dispose of old battery.

WARNING! Do not operate with battery cover removed. Replace fuse only with identical type: 200mA/250V fast blow for mA range; 10A/250V for 10A range.

Maintenance & Care

Keep meter clean and dry. Store in carrying case when not in use.

Clean with soft, dry cloth. Do not use solvents or water.
Inspect test leads for damage before each use.
Calibrate annually for accurate measurements.
Remove battery if storing for extended periods.

CAUTION! Do not expose to extreme temperatures, moisture, or direct sunlight.

Regulatory Information

Complies with relevant safety standards. This device complies with Part 15 of FCC Rules. Operation is subject to condition that device does not cause harmful interference. Copyright © Cen-Tech. For support, visit www.harborfreight.com or contact 1-800-444-3353.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Display blank	Battery dead or not installed	Replace battery; ensure proper installation.
Inaccurate readings	Low battery; wrong function; damaged leads	Replace battery; select correct function; inspect leads.
No continuity buzzer	Circuit not continuous; buzzer disabled	Check circuit continuity; ensure switch set correctly.
Meter does not turn on	Battery installed incorrectly; faulty power button	Reinstall battery; press power button firmly.
Fuse blows frequently	Measuring current on voltage setting; overload	Use correct jacks and settings; do not exceed ratings.

Reset: Turn meter off, remove battery for 30 seconds, reinstall.

Service: 1-800-444-3353; www.harborfreight.com