MASTECH MS2009A Digital AC Clamp Meter User Manual

: June 15, 2024
: MASTECH

Table of Contents

MASTECH MS2009A Digital AC Clamp Meter
Specifications
Overview

MASTECH MS2009A Digital AC Clamp Meter

Specifications

Product Name: Digital Clamp Meter
Model: N/A
Measuring Range: AC, AC/DC voltage, resistance
Maximum Voltage Rating: CAT III 600 V
Special Features: Non-contact voltage detection, MAX HOLD, backlight

Overview

The Digital Clamp Meter is a safe and reliable electrical meter with stable performance. It is designed with a large scale integrated circuit double integral A/D converter and a full measuring range of overload protection circuits. With its unique appearance and superior performance, this meter can be used for measuring AC current, AC/DC voltage, resistance, diode, circuit continuity test, and non-contact voltage detection.

Meter Indications
The meter features various indications and keys:

OFF: Power button to turn the meter on or off
200/600 : Function measuring range switch for voltage and current measurements
2/20: Function measuring range switch for resistance measurement
NCV: Non -contact voltage detection position
V: Voltage measurement position
SEL RAN: Select the function measuring range
MAX HOLD: Maximum value hold function
AC CLAMP METER: AC measurement position
AUTO MAX: Automatic maximum value measurement
CAT III 600 V : Maximum voltage rating of the meter

Other Keys
The meter also includes additional keys for specific functions:

Backlight: Press and hold this key for 2 seconds to activate the backlight. Press and hold again for 2 seconds to turn off the backlight.
HOLD: Press this key to hold the current reading on the display. Press again to return to the normal measuring state.

Safety Requirements

The meter digital clamp meter has been designed according to Safety Standard IEC61010-1 IEC61010-2-032 for electronic measuring instruments and hand-held current clamps. It conforms to safety standards for double insulation CAT III 600 V and grade 2 for pollution.

Safety Signs

Important safety sign. Refer to the operation manual.
Danger high voltage.
Allow to be used around conductors without danger to life.
Double insulation (Safety equipment with class II).
Ground (earth)

Notes

Before using this meter, please read carefully this user manual and pay special attention to “warning” content. Please follow the “warning” instructions.
To meet the safety requirements, only use the probe supplied with the meter. If the probe is replaced, a new one with the same model or same electric specification should be used.
Before using it, please check the meter and probe for any damage or abnormal conditions. If an abnormal situation appears (for example: bare probe, enclosure damage, no liquid crystal display, etc), don’t use the meter.
When the meter is measuring, don’t touch the unused input terminal.
Be careful when measuring voltage greater than 60V DC and 30V AC. Don’t allow fingers to touch or block part of the probe.
When you can’t determine the size range of the signal to be tested, please switch the function measuring rang to the maximum position, then gradually select lower ranges until the correct range is found. Do not exceed the input limit specified in each measuring range.
Don’t measure voltage greater than the upper limit for each range.
Before changing the function measuring range switch to a different position, set the probe and the circuit being tested to an open state.
Before online resistance measurement, turn off all power supplies in the circuit and release all charges on both ends of the capacitor.
Don’t expose the meter exposure to strong light, high temperature, or moisture (humidity).
Don’t touch bare wires, connectors, or circuits being measured.

Maintenance

Before opening the meter back cover, make sure that the probe is removed from the circuit to be measured.
Only a wet cloth and a small amount of detergent can be used for cleaning the meter. Don’t use chemical solvents to wipe the meter case.
If you find any abnormal condition on the meter, stop using the meter immediately and have it repaired.
Repair the meter with the help of a trained technician.

Overview

The Meter is a safe and reliable digital clamp meter with stable performance. Its design is based on a large-scale integrated circuit double-integral
A/D converter, with a full measuring range of overload protection circuit. With a unique appearance, it is a special electrical meter with superior performance.
The meter can be used for measuring AC, AC/DC voltage, resistance, diode, circuit continuity test, and non-contact voltage detection.

Meter Indications

AC clamp head
Pick AC
NCV indicator light
When the voltage of the conductor under test is more than AC 90V, the indicator will flash constantly.
SEL function exchange key
When it is in the V position, it is used to switch between DCV and ACV .
When it is in position, it is used to switch between diode measurement and continuity measurement.
Display
LCD (4 significant digits).
COM input end
In addition to AC, the negative input end of the black probe.
INPUT end
Red probe positive input end when measuring voltage, resistance, diode forward voltage drop
and circuit continuity.
Function measuring switch
Used to select each function and measure range grade.
Clamp head center position
To improve current measurement accuracy, place the conductor to be measured in the center position.
NCV sense position
When detecting non-contact voltage, position close to the conductor to be tested

Other Keys

Backlight
The meter display is set with a backlight. Press the key for 2 seconds to light. Press the key for 2 seconds again to turn off the backlight.

HOLD data hold key
Press the “HOLD” key. The meter display will keep the last test reading, and show the “ ”H symbol. Press the “HOLD” key again and the meter will restore to a normal measuring state.

RAN Manual/Automatic Switch Key

In voltage and resistance measurement position, the clamp meter is set to automatic measuring range by default. Press this key to switch to the manual measuring range.
In the manual measuring range mode, click the key once to jump to the upper grade. If it is at the top grade, then it will jump to the bottom grade. Hold this key for 2 seconds to switch back to the automatic measuring range.

MAX Maximum reading value display

Press the “MAX” key. The display will show the maximum reading value among measuring data.
Press the “MAX” key again. The meter will revert to the normal measurement state
NCV Non-contact voltage detection switch Used for non-contact voltage detection.

Schematic Drawing For Panel

Digital Clamp Meter

Instructions
DC Voltage Measurement

Insert the red probe into the “INPUT” jack and insert a black probe into the “COM” jack.
Place function measuring range switch to DC voltage measuring range. Press the “SEL” key, and connect the probe to the power source or load to be tested. The polarity of the end connected with the red probe will be shown in the display at the same time.
Read the measuring result from the display.
Notes!
- If the range of voltage to be tested is not known in advance, place the function measuring switch to the maximum range, then gradually reduce to obtain the correct range.
- Pay special attention to avoid shock when measuring high voltage.

AC Voltage Measurement

Insert the red probe into the “INPUT” jack and insert the black probe to the “COM” jack.
Place the function measuring range switch to the AC voltage measuring range, and connect the probe to the power source or load to be tested. The polarity of the end connected with the red probe will be shown in the display at the same time.
Read the measuring result from the display. Notes!
NOTE: Pay special attention to avoid shock when

AC Current Measurement

Place function measuring range switch to AC measuring range.
Press the trigger, open the clamp head, and clip the lead in the clamp to measure the lead current. Note: Clamping two or more leads at the same time will give an invalid reading.
Read the measuring result from the display.
Note: If the range of current to be tested is not known in advance, please place the function measuring switch to the maximum current range, then gradually reduce it to obtain the correct range.

Resistance Measurement

Insert the red probe and black probe to the “INPUT” and “COM” jack.
Place the function measuring range switch to the required Ω position, and connect the probe to the resistor to be tested.
Read the measuring result from the display.

Note:

If the measured resistance value is more than the maximum value of the chosen measuring range, it will show “OL`”. At this time, select a higher range.
When checking online resistance, first turn off all power supplies in the circuit to be measured and discharge all capacitors fully.
When measuring the resistance of more than 1MΩ, the reading will be stable after several seconds. This is normal for high-resistance measuring.

Diode Test
Insert red probe to “INPUT” and insert black probe to “COM” jack. At this time, the red probe polarity is “+”.
Place function measuring switch to position. The red probe is connected to the anode of the diode under measurement, and the black probe is connected to the cathode of the diode under measurement. Read the approximate forward voltage drop value from the display.

Circuit Continuity Test
Insert the red probe into the “INPUT” jack, and insert the black probe into the “COM” jack. Place the function measuring switch in position and press the SEL key to enter the circuit continuity test. The probe is connected to two points of the circuit under measurement. In the continuity test, when the test resistance is less than 60Ω, the buzzer will sound. When it is from 60Ω to 90Ω, the buzzer may or may not sound. When it is more than 90Ω, the buzzer won’t sound.

Non-Contact Voltage Detection
Press the NCV key. Place the non-contact sensor close to the conductor. When the test voltage is greater than 90V AC
(RMS) and when the meter is close to the conductor, the meter induction voltage indicator will flash and the buzzer will sound.

Note:

Even if there is no indication, voltage may exist. Don’t use a non-contact voltage detector to judge whether there is voltage in the wire. Detection operation could be affected by socket design, insulation thickness, type, and other factors.
When inputting voltage on the meter input terminal, due to the existence of the induced voltage, the voltage induction indicator also may light.
Interference sources of the external environment (such as flashlight, motor, etc.) may trigger non-contact voltage detection by mistake.

Technical Data

General cha racteristics: the maximum voltage of voltage input end and ground CAT III 600V and 600V~
Display method: LCD with a maximum of 1999
Measuring principle: double integral A/D conversion
Measuring range choice: Automatic
Measurement speed: 3 times/s
Unit display: has function and power unit symbol display
Polarity indication: display “-” symbol for negative polarity input
Overrange display: “ OL”
Data hold function: display “ ” oH n the top of the LCD
Low battery display: display “ ” on the top of the LCD
Power Battery: DC1.5V Х3 SIZE AAA.
Outside measurement: 220mm×81mm×41mm
Weight: about 286g (including battery)
The largest size of an open clamp jaw: is 26mm
Operating environment: 5°C~35°C
Storage temperature: – 10°C~50°C

Accuracy Indicators

Accuracy: ±(% of reading + digits) with one year of warranty
Environment temperature: 18 °C~28°C
Environment humidity: not more than 75%
Temperature coefficient: 0.1 × Accuracy/ 1°C

When measuring AC, place the conductor to be measured in the center position of the clamp head. If it is not in the center position, it can increase error by 1.5%

DC Voltage

MASTECH-MS2009A-Digital-AC-Clamp-Meter-FIG-18

Input impedance: 10MΩ.
Maximum allowable input voltage: 600V DC or 600V AC (RMS)

AC Voltage

Input impedance: 10MQ.
Measuring frequency range: 40Hz~400Hz.
Maximum allowable input voltage: 600V DC or 600V
AC (RMS)

AC Current

Measuring frequency range: 0~500A 40Hz ~400Hz; 500A~600A 60Hz~400Hz.
Maximum allowable input current: AC 600A for not more than 20 seconds.

Resistance

MASTECH-MS2009A-Digital-AC-Clamp-Meter-FIG-21

Overload protection: 250V DC or 250V AC (RMS)

Diode Test

Overload protection: 250V DC or 250V AC (RMS)

Continuity Test

MASTECH-MS2009A-Digital-AC-Clamp-Meter-FIG-23

Note: When resistance is from 600 to 9002, the buzzer may or may not sound. When it is more than 90Q, the buzzer won’t sound
Overload protection: 250V DC or 250V AC (RMS)

Automatic Power-Off
In order to extend the battery life, the meter has an automatic shutdown function. If there is no key operation or function measuring range change within 15 minutes, the meter power will disconnect automatically. Press the “SEL” button to return the meter to the working state again.

Replacing The Batteries

WARNING To avoid electric shock, make sure that the test leads have been moving away from the circuit under measurement before opening the battery cover of the meter. Do not mix old and new batteries. Do not mix alkaline, standard (carbon-zinc), or rechargeable (ni-cad, ni-mh, etc) batteries.