Meco 27-AUTO - User Manual

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27-27T : 28-09-2012

DIGITAL CLAMP METER

MODEL : 27-AUTO/27T-AUTO

INSTRUCTION MANUAL

Temperature (27T-AUTO only)

Range : -20

C to 750

-4

F to 1400

Accuracy : ± (3% rdg + 5 dgts)

Resolution : 1

C / 1

Sensor : K type thermocouple

2. OPERATION

Before taking any measurements, read the safety information section.

Always examine the instrument for damage, contamination (excessive

dirt, grease, etc.) and defects. Examine the test leads for cracked or

frayed insulation. If any abnormal conditions exist do not attempt to

make any measurements.

AUTO POWER OFF (APO)

The meter will be switch off if no range switch or key is used for approx

15 minutes.

FUNCTION BUTTON

The Button is used for select

range and

F (27T-AUTO only)

HOLD BUTTON

Press Hold button to toggle in and out of Hold mode, In the Hold mode,

the “ H ” annunciator is displayed.

MAX BUTTON

Press MAX button to toggle in and out of MAX mode (holding the highest

absolute reading) In the MAX mode, the “ MAX ” annunciator is displayed.

This function is available for DCV, ACV & Current ranges.

2.1 Current Measurements

1. Set the Range switch to the highest 400A range.

2. Press the trigger to open transformer jaws, clamp onto one

conductor only and release trigger. Jaws should be completely

closed. Read the current directly on the display. It is

recommended that the conductor be placed at th e center of

the closed jaws for maximum accuracy (Fig. - 1).

1. SPECIFICATIONS

1.1 General Specification

Display

n 3½ digit liquid crystal display (LCD) with a

maximum reading of 2000 counts.

Polarity

n Automatic, positive implied, negative polarity

indication.

Overrange

n (OL) or (-OL) is displayed.

Zero

n Automatic.

Low battery

n “ ” is displayed when the battery

indication voltage drops below the operating level.

Measurement

n 3 times per second, nominal.

rate

Operating

n 0°C to 50°C at < 70% relative humidity.

Environment

Storage

n -20°C to 60°C, 0 to 80% R.H. with battery

Temperature removed from meter.

Accuracy

n Stated accuracy at 27

C ± 5

<75% relative humidity.

Power

n Two 1.5V ‘AAA’ Size Battery

Battery life

n 200 hours typical

Dimensions

n 185 x 65 x 28mm (approx.)

Weight

n 170gms including battery (approx.)

Accessories

n Pair of test leads x 1, Instruction manual x 1,

1.5V batterys (installed) x 2,

Carring Case x 1, (K type thermocouple upto

260

C for 27T-AUTO only) x 1

Maximum Jaw

n 25mm

Opening

1.2 Electrical Specification

Accuracies are ± (% reading + number of digits) at 27 ± 5°C and

humidity of less than 75% RH.

AC CURRENT (Auto Ranging) 50-60Hz

DC VOLTAGE (Auto Ranging)

Range Accuracy Overload Protection

600V ±(0.8% rdg + 3 dgt) 600V DC / AC rms

Range Accuracy Overload Protection

600V ±(1.2% rdg + 3 dgt) 600V DC / AC rms

RESISTANCE (Auto Ranging)

Range Accuracy Overload Protection

20M

V ±(1.2% rdg + 3 dgt) 250V DC / AC rms

AC VOLTAGE (Auto Ranging) 50-60Hz

Continuity Check

Threshold Level : 40V Approx.

Response Time : 1m Sec. Approx.

Open Circuit Voltage : 0.4V Approx.

Indication : ‘

’ is displayed on LCD and buzzer sounds

at continuity.

Diode Test

Measurement Current : 1.0 ± 0.6 mA Approx.

Open Circuit Voltage : 1.6V Approx.

Range Accuracy Overload Protection

2A ±(3% rdg + 5 dgt)

20A ±(2% rdg + 3 dgt) 400A AC Max.

200A

±(2% rdg + 5 dgt)

for 1 minute

400A

Need help?

Do you have a question about the Meco 27-AUTO and is the answer not in the manual?

This document describes two models of digital clamp meters: the MECO 27-AUTO/27T-AUTO and the MECO 225AUTO. Both devices are designed for electrical measurements and share many common features, with the 27T-AUTO model offering additional temperature measurement capabilities.

Function Description

Both models are digital clamp meters used for measuring various electrical parameters. They feature an auto-ranging function for ease of use.

Common Functions:

AC Current Measurement: Measures AC current in the 50-60Hz range.
DC Voltage Measurement: Measures DC voltage with auto-ranging.
AC Voltage Measurement: Measures AC voltage in the 50-60Hz range with auto-ranging.
Resistance Measurement: Measures resistance with auto-ranging.
Continuity Check: Provides an audible indication (beeper) when resistance is below a certain threshold, indicating continuity.
Diode Test: Allows for testing diodes to determine forward-voltage drop and junction status (open, shorted).
NCV Check (Non-Contact Voltage): Indicates the presence of voltage in an electrical circuit or equipment without physical contact. The NCV LED flashes when voltage is detected.

Additional Function for 27T-AUTO only:

Temperature Measurement: Measures temperature using a K-type thermocouple.

Important Technical Specifications

General Specifications (Common to 27-AUTO/27T-AUTO and 225AUTO):

Display: 3½ digit LCD with a maximum reading of 2000 counts (27-AUTO/27T-AUTO) or 3¾ digit LCD with a maximum reading of 3999 counts (225AUTO).
Polarity: Automatic, positive implied, negative polarity indication.
Overrange Indication: "OL" or "-OL" displayed.
Zero: Automatic.
Low Battery Indication: " " (battery symbol) displayed when battery voltage drops below operating level.
Measurement Rate: 3 times per second, nominal.
Operating Environment: 0°C to 50°C at < 70% relative humidity.
Storage Temperature: -20°C to 60°C, 0 to 80% R.H. (with battery removed).
Accuracy: Stated at 27°C ± 5°C, <75% relative humidity.
Power: Two 1.5V 'AAA' size batteries.
Battery Life: Approximately 200 hours.
Accessories: Pair of test leads, instruction manual, 1.5V batteries (installed), carrying case. The 27T-AUTO also includes a K-type thermocouple (up to 260°C).

Dimensions and Weight:

27-AUTO/27T-AUTO: 185 x 65 x 28mm (approx.), 170gms (including battery).
225AUTO: 186 x 58 x 30mm (approx.), 165gms (including battery).

Maximum Jaw Opening:

27-AUTO/27T-AUTO: 25mm.
225AUTO: 32mm.

Electrical Specifications (Accuracies at 27 ± 5°C and < 75% RH):

AC Current (50-60Hz):

27-AUTO/27T-AUTO:
- 2A: ±(3% rdg + 5 dgt)
- 20A: ±(2% rdg + 3 dgt)
- 200A: ±(2% rdg + 5 dgt)
- 400A: ±(2% rdg + 5 dgt)
- Overload Protection: 400A AC Max. for 1 minute.
225AUTO:
- 40A: ±(1.5% rdg + 5dgt)
- 400A: ±(1.5% rdg + 5dgt)
- Overload Protection: 400A AC Max. for 1 minute.

DC Voltage (Auto Ranging):

27-AUTO/27T-AUTO: 600V: ±(0.8% rdg + 3 dgt)
225AUTO: 600V: ±(0.8% rdg + 1dgt)
Overload Protection (both models): 600V DC/AC rms (for 27-AUTO/27T-AUTO), AC voltage ranges 600V AC, Resistance ranges 250V AC (for 225AUTO).

AC Voltage (Auto Ranging) 50-60Hz:

27-AUTO/27T-AUTO: 600V: ±(1.2% rdg + 3 dgt)
225AUTO: 600V: ±(1.0% rdg + 3dgt)
Overload Protection (both models): 600V DC/AC rms (for 27-AUTO/27T-AUTO), AC voltage ranges 600V AC, Resistance ranges 250V AC (for 225AUTO).

Resistance (Auto Ranging):

27-AUTO/27T-AUTO: 20MV: ±(1.2% rdg + 3 dgt)
225AUTO: 40MV: ±(1.0% rdg + 2dgt)
Overload Protection (both models): 250V DC/AC rms (for 27-AUTO/27T-AUTO), AC voltage ranges 600V AC, Resistance ranges 250V AC (for 225AUTO).

Continuity Check:

Threshold Level: 40V Approx. (27-AUTO/27T-AUTO), 50V Approx. (225AUTO).
Response Time: 1m Sec. Approx.
Open Circuit Voltage: 0.4V Approx.
Indication: ')' displayed on LCD and buzzer sounds at continuity.

Diode Test:

Measurement Current: 1.0 ± 0.6 mA Approx.
Open Circuit Voltage: 1.6V Approx. (27-AUTO/27T-AUTO), 0.4V Approx. (225AUTO).

Temperature (27T-AUTO only):

Range: -20°C to 750°C (-4°F to 1400°F).
Accuracy: ± (3% rdg + 5 dgts).
Resolution: 1°C / 1°F.
Sensor: K type thermocouple.

Usage Features

General Operation:

Before any measurements, users must read the safety information section and examine the instrument and test leads for damage or defects.
Auto Power Off (APO): The meter will automatically switch off after approximately 15 minutes (27-AUTO/27T-AUTO) or 3 minutes (225AUTO NCV range) if no range switch or key is used.

Button Functions:

Function/Select Button: Used to select ranges (e.g., V/Ω, continuity, diode test, °C/°F for 27T-AUTO).
HOLD Button (Data Hold Button for 225AUTO): Toggles in and out of Hold mode. The "H" (or "HOLD" for 225AUTO) annunciator is displayed when active, freezing the current reading on the display.
MAX Button (27-AUTO/27T-AUTO only): Toggles in and out of MAX mode, holding the highest absolute reading. The "MAX" annunciator is displayed. This function is available for DCV, ACV, and Current ranges.

Measurement Procedures:

Current Measurement: Set the range switch to the highest 400A range. Open the transformer jaws, clamp onto a single conductor, and release. Read the current directly. For maximum accuracy, the conductor should be placed at the center of the closed jaws. If the reading is lower than 20A (or 40A for 225AUTO), set the range switch to the next lower range position.
Voltage Measurement: Connect red test lead to "V/Ω" jack and black test lead to "COM" jack. Set the range switch to the desired Voltage type (AC or DC). Connect test leads to the device or circuit. For DC, a (-) sign indicates negative polarity.
Resistance Measurement: Connect test leads as for voltage. Set range switch to the V/Ω range. If the circuit is connected, turn off power and discharge capacitors. Connect leads across the resistance. For high resistance, avoid touching adjacent points.
Diode Test: Connect test leads as for voltage. Set range switch to the V/Ω range and select Diode range. Turn off power to the circuit. Touch probes to the diode. A forward-voltage drop of about 0.6V is typical for silicon diodes. "OL" indicates an open junction; a low reading (<1000) indicates a shorted junction.
Continuity Measurement: Connect test leads as for voltage. Set range switch to the V/Ω range and select Continuity. The beeper sounds continuously if resistance is less than 40V (or 50V for 225AUTO).
NCV Check: Set range switch to NCV Range. The NCV indicator flashes every 1-2 seconds. When the clamp jaw is near an object with voltage, the NCV LED flashes quickly. Detection against in-wall outlets is possible. In NCV range, the meter will auto power off within 3 minutes if no signals are obtained.
Temperature Measurement (27T-AUTO only): Set range switch to °C position. Use the function button to select °C or °F. Connect the thermocouple to "V/Ω" and "COM" input terminals. Touch the probe to the area or surface to be measured.

Maintenance Features

Safety Information:

Always observe safety information to ensure maximum personal safety.
Do not use the meter if it or the test leads appear damaged or if it is not operating properly.
The clamp meter is designed for current measurements on circuits with a maximum voltage difference of 500VAC between any conductor and ground potential. Using it for higher voltages can cause electric shock or damage.
Before measuring current, ensure test leads are removed from the instrument.
The instrument is protected for overload up to 600 VAC for 1 minute. Do not take current readings on circuits where the maximum current potential is unknown.
Do not exceed the maximum currents the instrument is designed to measure.
Turn off power to the circuit under test before cutting, unsoldering, or breaking the circuit.
Use caution when working above 60V DC or 30V AC rms due to shock hazards.
When using probes, keep fingers behind the finger guards.
Measuring voltage exceeding the meter's limits can damage the meter and expose the operator to shock hazards. Always recognize the meter voltage limits stated on the front of the meter.
For temperature measurement, avoid heat damage to the meter and probe by keeping it away from very high temperature sources.

Battery Replacement:

WARNING: Remove test leads before changing battery or servicing.
The meter is powered by two 1.5V 'AAA' size batteries.
The "" symbol appears on the LCD when battery replacement is needed.
To replace, remove the screw from the battery cover, lift off the cover, remove old batteries, and replace with new ones.

Meco 27-AUTO Specifications

General

Brand	Meco
Model	27-AUTO
Category	Measuring Instruments
Language	English

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