digitech QM1552 True RMS Inductance Capacitance Digital Multimeter User Manual

digitech QM1552 True RMS Inductance Capacitance Digital Multimeter

Specifications:

• Max. Display: Yes
• Basic Accuracy: Yes
• DC Voltage Range: Manual
• AC Voltage Range: Yes
• DC Current Range: Yes
• AC Current Range: Manual
• Resistance(Ω): Yes
• Capacitance (CAP): Yes
• Frequency (Hz): Yes
• Inductance: Yes
• Temperature: Yes
• Data Hold: Yes
• Diode Test: Yes
• Duty Cycle: Yes
• Continuity Check: Yes
• NCV (Non-Contact Voltage Detection): Yes
• Line Test: Yes
• Max/Min: Yes
• Hz/% Range: Yes
• LCD Backlight: Yes
• Auto Power Off: Yes
• Auto Power Off Disable: No

Product Usage Instructions

Safety Instructions:
The symbol in the manual indicates that you must refer to the Operating Instructions to avoid personal injury or damage to the meter. Remember to remove the batteries to prevent them from draining when not in use.

Function Buttons and Display:

• HOLD: Press this button to lock the readings in the LCD. Press again to exit the hold mode. Press to switch the backlight mode; it will automatically exit from the backlight mode
  after around 15 seconds.

• V/: Positive input terminal for various measurements like voltage, resistance, diode, temperature, frequency, capacitance, etc.

• COM: Negative input terminal for voltage, diode, temperature, etc.

• mA: Input terminal for lower 200mA current.

• A: 10A input terminal.

• FUNC: Activates secondary functions primarily for diode or continuity testing.

• REL: Stores reading and resets display to zero. Sets a relative reference point for the next reading.

• MIN/MAX: Stores input values; beeps when a value is breached and a new value is set.

General Usage:
Moving the rotary switch to each individual range of measurement or to the range needing to be measured will power on the unit.
Readings and measurements taken by the multimeter will display on the LCD screen.

FAQ:

1. Q: How do I activate the backlight on the multimeter?
   A: Press the HOLD button to switch the backlight mode. The backlight will automatically exit after around 15 seconds.

2. Q: What is the purpose of the REL function button?
   A: The REL button stores readings and resets the display to zero. It sets a relative reference point to measure against the next reading.

3. Q: What is the max input voltage supported by the multimeter?
   A: The max input voltage is AC750VRMS for AC and DC1000V for DC.

True RMS Inductance /Capacitance
Digital Multimeter User Manual
Thank you for purchasing this Digital Multimeter. A powerful true RMS multimeter that includes non-contact voltage testing, and a backlit LCD.
Please familiarise yourself with the functions of the multimeter before use. We recommend retaining this manual for ease of reference.

• Do not use the meter if the meter or test leads look damaged, or if you suspect that the meter is not operating properly.
• Never ground yourself when taking electrical measurements. Do not touch potential.
• Keep your body isolated from ground by using dry clothing, rubber shoes, rubber mats, or any approved insulating material.
• Turn off power to the circuit under test before cutting, de-soldering, or breaking the circuit. Small amounts of current can be dangerous.
• Use caution when working above 60V DC or 30V AC rms, such voltages pose a shock hazard
• When using the probes, keep your fingers behind the finger guards on the probes.
• Measuring voltage which exceeds the limits of the multimeter may damage the meter and expose the operator to a shock hazard. Alwa recognize the meter voltage limits as stated on the front of the met
• Never apply voltage or current to the meter that exceeds the specifi maximum.

FUNCTIONS

Max. Display| 2000 Counts
Basic Accuracy| 0.5%
DC Voltage Range| 200mV-1000V
AC Voltage Range| 200mV-750V
DC Current Range| 200µA-10A
AC Current Range| 200µA-10A
Resistance(O)| 200O>200MO
Capacitance (CAP)| 10nF-100mF
Frequency (Hz)| 10Hz-10MHz
Inductance| 2mH-20H
Temperature| -20°C – 1000°C
Data Hold| Yes
Diode Test| Yes
Duty Cycle| Yes
Continuity Check| Yes
NCV (Non-Contact Voltage Detection)| Yes
Line Test| Yes
Max/Min| Yes
Hz/%| Yes
Range| Manual
LCD Backlight| Yes
Auto Power Off| Yes
Auto Power Off Disable| Yes

SAFETY

This symbol indicates that the operator must refer to an explanation in the Operating Instructions to avoid personal injury or damage to the meter.

CAUTIONS

• Improper use of this meter can cause damage, shock, injury or death. Read and understand this user manual before operating the meter.
• Always remove the test leads before replacing the battery o fuses.
• Inspect the condition of the test leads and the meter itself for any damage before operating the meter.
• Do not measure voltage if the voltage on the terminals exceeds 1000V above earth ground.
• Use great care when making measurements if the voltages are greater 30VAC RMS or 60VDC, these voltages are considered a shock hazard.
• Always discharge capacitors and remove power from the device to be tested before performing Diode, Resistance or Continuity tests.
• To avoid damages to the meter, do not exceed the maximum limits of the input values shown in the specifications.
• If the multimeter is going to be unused for an extended period of time, remove the batteries to prevent them from draining.

FUNCTIONS

LCD Screen| Readings and measurements taken by the multimeter will display in this area.
Function Buttons| HOLD: Press this button to lock the readings in the LCD, press again to exit the hold mode. Press “ ” to switch the back light mode, around 15 second exit from back light mode.
Rotary Switch| Moving the rotary switch to each individual range of measurement or to the range needing to be measured will also power on the unit.
Input Jacks| V/0 : The positive input terminal for voltage, resistance, diode, temperature, frequency, capacitance, etc.
COM: the negative input terminal for voltage, diode, temperature, etc.
mA: the input terminal for lower 200mA current A: 10A input terminal.
Functions| FUNC: Activates secondary functions where available – primarily for use with diode or continuity testing
REL: Stores reading and resets display to zero. Sets a relative reference point to measure against the next reading.
MIN/MAX: Stores input values; beeps when a value is breached and a new value is set.

SYMBOL DESCRIPTION

HOLD| Data Hold
| Diode Test
mV V| Unit of Voltage
Hz KHz MHz| Unit of Frequency
Ω
KΩ
MΩ| Unit of Resistance
hFE| Transistor
TRMS| True RMS Measurement
%| Duty Cycle Measurement
| Low Voltage Indication
| Continuity Check
uA mA A| Unit of Current
pF nF uF mF| Unit of Capacitance
uH mH H| Unit of Inductance
°C| Centigrade Temperature
°F| Fahrenheit Temperature
REL| Relative Value Measurement

GENERAL SPECIFCATIONS

• Max. Input Voltage: AC750VRMS, DC1000V
• Sampling Rate: Approx. 2 times/sec
• Operating Temperature: 0°C-40°C (32°F~104°F)
• Operating Humidity: <80%RH
• Storage Temperature: -10°C-60°C (14°F~122°F)
• Storage Humidity: <70%RH
• Power Supply: 9V Battery (6F22) x 1pc
• Dimension: 200 x 92 x 60mm (L x W x H)
• Weight: Approx. 230g (include battery)

BOX CONTENTS

• 1 x Digital Multimeter
• 1 x Temperature Probe
• 1 x User Manual

MEASUREMENT SPECIFICATIONS

• Accuracy: ±(%readings + digit),
• Environment temperature: 18°C~28°C; humidity: ≤80%

DC VOLTAGE

• Input Impedence: 10MΩ
• Max. Input Voltage: 1000VDC

AC VOLTAGE

• Input Impedence: 10MΩ
• Max. Input Voltage: 750V ACRMS
• Frequency Range: 40-1000Hz

DC CURRENT

• Overload Protection: Fuse FF200mA/500V for mA range Fuse FF10A/500V for A range

AC CURRENT

• Overload Protection: Fuse FF200mA/500V for mA range
  Fuse FF10A/500V for A range

• Frequency Range: 40-1000Hz

RESISTANCE

• Overload Protection: 250VDC or 250VAC RMS

DIODE & CONTINUITY

TEMPERATURE

400° ~ 1000°
0° ~ 752°| 1°F| ±(3.0% reading + 3 digits)
752° ~ 1832°

• Overload Protection: 250VDC or 250VAC RMS

FREQUENCY

• Overload Protection: 250VDC or 250VAC RMS

CAPACITANCE

• Overload Protection:  250VDC or 250VAC RMS

NOTE: It is normal for small capacitance measurements to display a reading once removed from the component being measured. Deduct the reading from the reading shown when measuring the capacitance for an accurate measurement.

INDUCTANCE

• Overload Protection:  360VDC or AC RMS

OPERATING INSTRUCTIONS

AC AND DC VOLTAGE MEASUREMENT
WARNING:
Risk of electrocution. High-voltage circuits, both AC and DC, are very dangerous and should be measured with great care.

• To avoid electrical shock and/or damage to the instrument, do not attempt to take any voltage measurement that might exceed 1000VDC or 750VAC RMS.
• To avoid electrical shock and/or damage to the instrument, do not apply more than 1000VDC or 750VAC RMS between the common terminal and the earth ground.
  1. Set the rotary switch to the voltage position.
  2. Insert the black test lead banana plug into the negative COM jack; insert the red test lead banana plug into the positive V/Ω jack.
  3. Touch the black test probe tip to the negative side of the circuit; touch the red test probe tip to the positive side of circuit.
  4. Read the voltage in the LCD display. The polarity of the red test lead connection will be indicated when making DC Voltage measurement eg. a reverse polarity reading will show as negative on the display.

NOTE: Unstable display may occur, especially at the low voltage range measurement, even no test leads inset at input terminals, if an erroneous reading is suspected, short the V jack and COM jack and make sure the zero displayed at LCD.

CURRENT MEASUREMENT
WARNING:

• To avoid damage to the meter, check the internal fuse before measuring current.
• Use the proper terminals, function and range for any current measurement
• Never attempt an open circuit potential to earth that is greater than 250V.
• Do not place the test leads in parallel with a circuit or component when the test leads are plugged into the current terminals.
  1. Remove the power from the circuit you are testing and discharge the capacitors of the circuit prior to setting the rotary switch to measure current.
  2. Insert black test lead banana plug into the negative COM jack. For current measurement less than 200mA, insert the red test lead banana plug into the mA jack. For current measurement between 200mA to 10A insert the red test lead banana plug into 10A jack.
  3. Place the red test lead on the anode of the diode and the black test lead on the cathode of diode. The meter will show the approximate forward voltage of diode while reverse voltage will indicate OL.
  4. Touch the test probe tips to the circuit or wire you wish to check, and the maximum value of resistance will be shown in the display. If the resistance is less than 100Ω, the audible signal will sound.

NOTE:

• In a circuit, a good diode should produce a forward bias reading of voltage, however, the reverse-bias reading can be variable based on resistance of other pathways between the probe tips.
• To avoid electric shock, never measure continuity on circuits of wires with voltage.

RESISTANCE MEASUREMENT
WARNING:
To avoid electric shock, disconnect power to the unit under test and discharge all capacitors before taking any resistance measurements. Remove the batteries and unplug the line cords.

1. Set the rotary switch to the desired resistance range.
2. Insert the black test lead banana plug into the negative COM jack, insert the red test lead banana plug into the positive V jack.
3. Touch the test probe tips across the circuit or part under test. It is best to disconnect one side of the part under test so the rest of the circuit will not interfere with the resistance reading.
4. Read the resistance in the LCD display.

NOTE:

• The measured value of a resistor in a circuit usually is different from the rated value of resistor, it is because the test current of the meter flows through all possible paths between the probe tips.
• In order to ensure the best accuracy in measurement of low resistance, short the test leads before the measurement and subtract this resistance value of the test leads.
• For high resistance measurement, the meter may take a few seconds to stabilize.
• In the open circuit, the meter display OL to indicate the over range.

CAPACITANCE MEASUREMENT
WARNING:
To avoid electric shock, disconnect power to the unit under test and discharge all capacitors before taking any capacitance measurements.

1. Set the rotary switch to desired capacitance range.
2. Insert the black test lead banana plug into the negative COM jack, insert the red test lead banana plug into the positive mA CX jack.
3. Touch the test leads to the capacitor to be tested and read the capacitance value in the display.

NOTE:

• The test may take more time for large capacitors to charge, wait until the readings settle before removing the leads.
• To improve the accuracy of measurement less than 10nF, subtract the residual capacitance of the meter and test leads.

TEMPERATURE MEASUREMENT
WARNING:
To avoid electrical shock, do not perform temperature measurement when the input voltage exceeds 36VDC or 36VAC RMS.

1. Set the rotary switch to °C / °F position, LCD displays values of environmental temperature.
2. Insert the temperature probe into the input jack, insert red plug of thermo probe into V °C/°F jack, black plug of thermo probe into COM jack, making sure to observe the correct polarity.
3. Place the temperature probe head onto the part you wish to measure, keeping the probe touching the surface until the reading stabilises.
4. Read the temperature in the LCD display.

FREQUENCY MEASUREMENT
WARNING:
To avoid electric shock, do not apply more than 250VDC or 250VAC RMS before taking frequency measurement.

1. Set the rotary switch to desired frequency range.
2. Insert the black text lead banana plug into the negative COM jack and the red test lead banana plug into the positive Hz jack.
3. Touch the test lead tips to the circuit under test.
4. Read the frequency value in the LCD display.

INDUCTANCE MEASUREMENT

1. Set the rotary switch to desired inductance range.
2. Insert the black test lead banana plug into the negative COM jack and the red test lead banana plug into the positive ma LX jack.
3. Touch the test lead tips to the circuit under test.
4. Read the inductance value in the LCD display.

DISPLAY BACKLIGHT
Press the button for 1 or 2 seconds to turn on or off the display backlight function, the backlight will automatically turn off after 10 seconds.

HOLD FUNCTION
The hold function freezes the reading in the display, press the HOLD button momentarily to activate or to exit the hold function.

AUTO POWER OFF
The auto off feature will turn the meter off after 15 minutes.

LOW BATTERY INDICATION
The icon will appear in the LCD display when the battery voltage becomes low, replace the battery when this icon appears.

MAINTENANCE
WARNING:

• To avoid the electric shock, disconnect the test leads from any source of voltage before removing the back cover or the battery or fuse covers.
• To avoid electric shock, do not operate the meter until the battery and fuse covers are in place and fastened securely.

BATTERY INSTALLATION
To avoid the false readings, replace the battery as soon as the battery indicator appears.

1. Turn power off and disconnect the test leads from the meter.
2. Open the rear battery cover by using screwdriver.
3. Insert the battery into battery holder, observing the correct polarity.
4. Put the battery cover back in place, secure with the screws.

REPLACING THE FUSES

1. Turn power off and disconnect the test leads from the meter.
2. Remove the battery cover and the battery.
3. Remove the screws securing the rear cover.
4. Gently remove the old fuse and install the new fuse into fuse holder.
5. Replace and secure the rear cover, battery and battery cover.

NCV (NON-CONTACT VOLTAGE) DETECTION
Due to external interference sources, this test may detect the wrong voltage. Please use as an estimate only. Detection may be interfered by socket design, insulation thickness and other variable conditions. External sources such as flashlights, motors, etc may interfere with reading and cause the wrong detection.

1. Set the rotary switch to NCV position and wait for EF to display on screen.
2. Contact the top part of meter with the circuit being tested.
3. The LED light will flash and an audible signal will sound, with the signal strength displayed on screen.

Distributed by: Electus Distribution Pty Ltd
46 Eastern Creek Dr, Eastern Creek NSW 2766 Australia Ph 1300 738 555 www.electusdistribution.com.au

References

• Electus Distribution - Home

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