REDMAX Digital Pen Type Multimeter

Overview

The REDMAX digital pen type multimeter is designed and produced in accordance with the safety requirements of the international electrical safety standard IEC-61010 for electronic measuring instruments and handheld digital multimeters, and meets the 600V CAT IV and 1000V CAT of IEC61010 III requirements.

Before using this instrument, please read the instruction manual carefully and pay attention to the relevant safe work guidelines.

• If the meter is used near equipment with relatively large electromagnetic interference, the meter's readings will become unstable and may experience large errors.
• Do not use if the meter or test lead is damaged.
• When working around bare conductors or buses, you must be extremely careful. Do not use this meter near explosive gas, steam or dust.
• The input value being measured must not exceed the input limit value specified in each range to prevent damage to the meter.
• When the meter is connected to the line under test, do not touch the unused input terminal.
• When the measured voltage exceeds 60VDC or 30VAC, please be careful to prevent electric shock.
• Before changing the range, make sure that the meter is not connected to the circuit under test.
• Do not measure resistance or continuity on a live circuit.

General Operation

1.1 Button Function

• HOLD/☼ key: Short press to activate value hold. Long press to turn backlight and flashlight on or off.
• RANGE key: Short press to manually select measurement range. Long press to release manual range mode and enter Auto range mode.
• SELECT key: Short press to switch between modes (e.g., AC & DC in Voltage mode).

A diagram shows the REDMAX Digital Pen Type Multimeter with labeled buttons: HOLD/☼, RANGE, SELECT.

1.2 Battery

This multimeter uses 2 x AAA 1.5V batteries for power supply. The batteries must be correctly installed in the battery box of the meter. Replace the battery immediately when the battery indicator appears.

Energy Saving

The meter automatically enters power save mode after approximately 15 minutes of inactivity. You can reactivate the meter by pressing any button.

Battery Replacement

If the [battery-symbol] appears on the screen, the batteries must be replaced to avoid incorrect measurements. The meter requires 2 x AAA batteries. Follow these steps:

1. Turn the selector dial to the OFF position.
2. Remove the battery cover at the rear of the meter.
3. Remove the old batteries.
4. Install the new batteries.
5. Re-install the battery cover and fasten it.

Measurement Guide

2.1 Measuring Voltage

1. Turn the rotary switch to the V position.
2. Connect the black test probe to the COM input socket.
3. The meter defaults to DC voltage. Press the SELECT button once for AC voltage measurement.
4. Use the test probe tip and the tip of the meter to measure the voltage value of the circuit or battery being tested.
5. Read the measured value on the liquid crystal display. When measuring DC voltage, the display also shows the polarity of the voltage.

Note: If the test probe on the meter is too short, the red insulating shield can be removed by sliding it off in the direction of the [arrow-symbol] shown in Fig.1.

Fig.1: A diagram illustrating the test probe tip and the red insulating shield with an arrow indicating the direction for removal.

2.2 Measuring Resistance

1. Turn the rotary switch to the [resistance-symbol] position.
2. Insert the black test pen into the COM input socket.
3. Use the test probe tip and the tip of the meter to measure the resistance of the circuit to be tested.
4. Read the measured resistance value on the liquid crystal display.

2.3 Diode Test

1. Turn the rotary switch to the [diode-symbol] position.
2. Insert the black test pen into the COM input socket.
3. Press the SELECT key once to select the [diode-symbol] mode.
4. The [diode-symbol] symbol indicates the diode test.
5. Connect the black test probe to the cathode and the tip of the meter to the anode of the diode being tested.
6. The meter will display the forward bias value of the diode.
7. If the polarity of the test pen is reversed, the meter will display "OL".

2.4 Continuity Test

1. Turn the rotary switch to the [continuity-symbol] position.
2. Insert the black test pen into the COM input socket.
3. Press the SELECT key twice to select the continuity mode.
4. The [buzzer-symbol] symbol indicates the audible continuity test, which uses the built-in buzzer to signal continuity (if resistance between probes is less than 30Ω ± 10).

2.5 Measuring Capacitance

1. Turn the rotary switch to the [capacitance-symbol] position.
2. Insert the black test pen into the COM input socket.
3. Press the SELECT key three times to select the capacitance mode.
4. Use the test probe tip and the tip of the meter to measure the capacitance of the circuit to be tested.
5. Read the measured capacitance value on the liquid crystal display. Note: When measuring large capacitance, it takes a certain time to stabilize the reading.

2.6 Non-contact Voltage Detection (NCV)

1. Turn the rotary switch to the NCV position.
2. Place the top of the meter close to the AC conductor. The meter will sense voltage greater than 110V.
3. The display will indicate the intensity of the induced electric field, and the buzzer will also sound.

2.7 Measuring Current

1. Cut off the power supply and discharge all high voltage capacitors in the circuit under test.
2. Turn the rotary switch to the NCV position. (Note: This instruction might be a typo and should refer to a current measurement range.)
3. Insert the black test pen into the COM input socket.
4. Connect the black test probe tip and the tip of the meter in series with the circuit under test.
5. Apply power to the circuit and read the displayed value.
6. If the display shows "OL", it means the input exceeds the selected range. The maximum allowable current is 200mA.

General Specifications

• Display: 3-3/4 digits LCD with a maximum reading of 4000.
• Measurement rate: updates 2-3/sec.
• Operating temperature: 0°C - 40°C, 0 - 75% RH.
• Storage temperature: -10°C - 50°C, 0 - 75% RH.
• Power: 2 x AAA 1.5V batteries.
• Dimensions (LxWxH): 205 x 43 x 32mm.
• Weight: Approx. 80g (including battery).

Safety Compliance

IEC 61010-1, 2000 CAT I 1000V overvoltage standards. Overvoltage installation categories per IEC 61010-1, 2000:

• CAT I: From high-voltage low-energy sources, e.g., electronic circuits or a copy machine.
• CAT II: From equipment supplied from the fixed installation, e.g., TVs, PCs, portable tools, and household appliances.
• CAT III: From equipment in fixed equipment installations, e.g., installation panels, feeders, short branch circuits, and lighting systems in large buildings.

Electrical Specifications

DC Voltage

Input impedance: 10MΩ on all ranges.

AC Voltage

Input impedance: 10MΩ. Frequency range: 40 ~ 400Hz.

DC Current

Measuring voltage drop: 200mV.

AC Current

Measuring voltage drop: 200mV. Frequency range: 40 ~ 400Hz.

Capacitance

Measuring voltage drop: 200mV. Frequency range: 40 ~ 400Hz.

Resistance

Measuring voltage drop: 200mV. Frequency range: 40 ~ 400Hz.