BTMETER BT-570N Inrush Current Clamp Multimeter User Manual

1. Introduction

This BTMETER BT-570N LCD Auto Range & Auto Power off Digital AC/DC AUTO CAL clamp multimeter is a portable, 6000 digit multimeter. It is ideally suited for field, laboratory, shop, and home applications. It accurately measures AC/DC current up to 1000A, voltage, resistance, capacitance, frequency, and duty cycle. It also features temperature measurement (℃/℉), Inrush Current, Continuity test with buzzer, and Diode test.

Key features include high resolution, True RMS for accurate measurements regardless of waveforms, relative mode for capacitance, DC Inrush, zero out for lower amps measurement, data hold, max/min functions, auto power off, polarity indication, and a low battery indicator. The device offers overload protection on all ranges, ensuring safe and easy operation.

2. Safety Information

To ensure maximum personal safety during operation, please observe the following safety guidelines:

• When measuring voltage, ensure the instrument is not switched to the current, resistance, diode, continuity, capacitance, or temperature range.
• Exercise extreme care when measuring voltage above 50V, especially from sources with high energy.
• Avoid making connections to 'live' circuits whenever possible.
• Before making resistance, diode, continuity, capacitance, or temperature tests, ensure the circuit under test is de-energized.
• Always ensure that the correct function and range are selected.
• Exercise extreme care when using the instrument in conjunction with a current transformer connected to the terminals if an open circuit occurs.
• Ensure that the test leads and probes are in good condition with no damage to the insulation.
• Do not exceed the overload limits as given in the specifications.
• Before opening the battery compartment to replace batteries, disconnect the test leads from any external circuit and set the selector switch to the "OFF" position.
• Keep your fingers behind the protection ring when measuring through the instrument lead.
• Change the battery when the battery symbol appears to avoid incorrect data.

3. Panel Layout

Familiarize yourself with the components of your multimeter:

1. Rotary Switch: Used to select functions and ranges.
2. D.HOLD/Back Light Key: Press briefly to lock the current display value ("H" symbol appears). Press again to exit HOLD. Press and hold for >2 seconds to turn the backlight ON/OFF.
3. SELECT Key: Used to choose between resistance, diode, continuity, or capacitance test, or to switch between DC/AC modes for voltage/current, and °C/°F for temperature.
4. MAX/MIN Key: Press to select MAX mode, press again for MIN mode, press again for MAX-MIN mode. Press and hold for >2 seconds to return to auto range mode.
5. Hz/DUTY Key: In ACV/ACA or Hz range, press to measure Hz, press again to measure duty cycle.
6. REL Key: Stores the current display value in memory. The new display value will show the difference between input and stored data. In Hz/Duty measurement, it is not functional. Press and hold for >2 seconds to measure inrush current in ACA range.
7. LCD Display: Large screen LCD Display for easy data reading.
8. Input Jacks: T+VΩHz, T-COM, T- (for temperature probe).

4. Specifications

4.1 General Specifications

• Display: 6000 digit LCD with a max. reading of 6000.
• Range control: Auto range control.
• Polarity: Automatic negative polarity indication.
• Zero adjustment: Automatic.
• Overrange indication: Only the "OL" display.
• Low battery: The battery symbol appears when voltage is below 6.2V.
• Auto Power Off: 15 minutes after inactivity (no switch or button press).
• Safety Standards: IEC 1010, Double Insulation, Pollution Degree 2, Overvoltage Category III 1000V.
• Clamp opening size: 45mm (1.77 inches).
• Operating Environment: Temperature 32~104°F (0~40°C), humidity <80%RH.
• Storage Environment: Temperature -4~140°F (-20~60°C), humidity <90%RH.
• Power supply: 9V Zinc-carbon battery.
• Dimensions: 225(H)×97(W)×40(D)mm.
• Weight: Approx. 350g (including batteries).

4.2 Electrical Specifications (at 23±5°C, 70% RH)

Overload protection: 1000V DC/750Vrms AC. Impedance: 10MΩ (100MΩ on 400mV scale).

Average sensing, calibrated to RMS of sine wave. Overload protection: 1000V DC/750Vrms AC. Impedance: 10MΩ.

Overload protection: 1000Arms within 60 seconds.

Average sensing, calibrated to RMS of sine wave. Overload protection: 1000Arms within 60 seconds.

Overload protection: 250V DC/250Vrms AC.

Overload protection: 250V DC/250Vrms AC.

Duty cycle: 0.1%~99.9%, Accuracy: ±0.5. Overload protection: 250V DC/250Vrms AC.

Overload protection: 36V DC/36Vrms AC. Note: This meter enclosure WRNM-010 type contact thermocouple limit temperature is 250°C (300°C shortly). Use special probe for high temperature testing.

4.3 Diode and Audible Continuity Test

• Diode Test: Forward DC current approx. 1.0mA. Reversed DC voltage approx. 3.0V.
• Continuity Test: Open circuit voltage approx. 1.0V. Beeper sounds if resistance is less than approx. 50Ω.

Overload protection: 250V DC/250Vrms AC.

5. Operating Instructions

For detailed visual instructions, please refer to the product demonstration video:

Product demonstration video showing various measurement functions.

5.1 DC/AC Voltage Measurement

1. Connect the black test lead to the "T-COM" socket and the red test lead to the "T+VΩHz" socket.
2. Set the Rotary switch to the "V" position.
3. Press the "SELECT" button to choose between AC or DC voltage test.
4. Connect the probes across the source or load under measurement.
5. Read the result from the LCD panel.

5.2 Resistance, Diode, and Audible Continuity Measurement

1. Connect the black test lead to the "T-COM" socket and the red test lead to the "T+VΩHz" socket.
2. Set the Rotary switch to the "Ω" position.
3. Press the "SELECT" button to select Resistance, Diode, or Audible Continuity test.
4. For Diode Test: Connect probes to the diode. Read forward voltage drop. If reverse connected, it will show overload.
5. For Audible Continuity Test: Connect probes across the circuit. The beeper sounds continuously if resistance is less than approx. 50Ω.
6. Read the result from the LCD panel.

Caution: Ensure the circuit to be tested is de-energized.

5.3 Capacitance Measurement

1. Connect the black test lead to the "T-COM" socket and the red test lead to the "T+VΩHz" socket.
2. Set the Rotary switch to the "CAP" position.
3. Connect the probes to the capacitance to be tested.
4. Read the result from the LCD panel.

Caution:

• Capacitors should be discharged before being tested.
• When testing large capacitance, it will take longer for the final indication (approx. 4~7 seconds for 1uF~99.99mF range).
• When testing small capacitance (≤1uF), to ensure measurement accuracy, first press "REL", then proceed with measurement.

5.4 Frequency and Duty Cycle Measurement

1. Connect the black test lead to the "T-COM" socket and the red test lead to the "T+VΩHz" socket.
2. Press the "Hz/Duty" key to select Hz or Duty test.
3. Connect the probes across the source or load under measurement.
4. Read the result from the LCD panel.

5.5 Temperature Measurement

1. Set the Rotary switch to the "°C/°F" position.
2. Connect the black test lead of the sensor to the "T-COM" socket and the red test lead to the "T+" socket.
3. Put the sensor probe into the temperature field under measurement.
4. Read the result from the LCD panel.

Caution:

• The temperature function shows a random number at ordinary times; you must insert the thermocouple in the temperature test hole while examining temperature.
• Do not change the thermocouple at will, otherwise, measurement accuracy cannot be guaranteed.
• Do not import voltage in the temperature function.
• Use a special probe for high temperature.

5.6 DC/AC Current Measurement

1. Set the Rotary switch to the desired "600A" or "1000A" position.
2. Press the "SELECT" key to choose between DC or AC current test.
3. For DC current, press the "REL" button to clear the value and make the display zero. For AC current, the ACA auto zero function is available.
4. Open the clamp by pressing the jaw-opening handle and insert the cable to be measured into the jaw.
5. Close the clamp and get the reading from the LCD panel.

Important Note:

• For accurate current measurement, ensure only one conductor is inside the clamp jaw. If two or more conductors are stuck in, the measurement will be invalid.
• Before this measurement, disconnect the test leads from the meter for safety.

6. Care and Maintenance

Your Digital Multimeter is an example of superior design and craftsmanship. The following suggestions will help you care for the multimeter so you can enjoy it for years.

• Keep it Dry: If it gets wet, wipe it dry immediately. Liquids can contain minerals that can corrode electronic circuits.
• Temperature Environment: Use and store the multimeter only in normal temperature environments. Temperature extremes can shorten the life of electronic devices, damage batteries, and distort or melt plastic parts.
• Handle with Care: Handle the multimeter gently and carefully. Dropping it can damage the circuit boards and cause it to work improperly.
• Cleanliness: Keep the multimeter away from dust and dirt, which can cause premature wear of parts.
• Cleaning: Wipe the multimeter with a damp cloth occasionally to keep it looking new. Do not use harsh chemicals, cleaning solvents, or strong detergents.

7. Battery Replacement (9V Battery)

1. Ensure the instrument is not connected to any external circuit. Set the Rotary switch to "OFF" position and remove the test leads from the terminals.
2. Open the cover of the battery cabinet by a screwdriver.
3. Replace the old batteries with new ones of the same type.
4. Close the battery cabinet cover and fasten the screw.

Caution:

• Use only fresh batteries of the required size and type.
• Always remove old or weak batteries, as they can leak chemicals that destroy electronic circuits.
• Please take out the battery when not using for a long time.

8. User Tips

• Double-Check Settings: Always ensure the correct function and range are selected before initiating any measurement to prevent damage to the meter or the circuit.
• Current Measurement Accuracy: For precise current readings, make sure only a single conductor is placed within the clamp jaw. Measuring multiple conductors simultaneously will result in an invalid reading.
• Capacitor Safety: Always discharge capacitors, especially large ones, before testing to avoid electric shock and ensure accurate measurements.
• Data Hold Function: Utilize the 'D.HOLD' button to freeze the display reading, which is particularly useful when taking measurements in awkward or poorly lit locations.
• Battery Longevity: To extend battery life and prevent potential leakage damage, remove the 9V battery if the multimeter will not be used for an extended period.

9. Warranty and Support

This product comes with a 1-year warranty from our store, covering manufacturing defects and malfunctions under normal use.

For further assistance or to view the original user manual, please refer to the PDF document: User Manual (PDF).