RuoShui 8246A/8246B Digital Benchtop Multimeter User Manual

1. Introduction

This manual provides detailed instructions for the safe and effective operation, maintenance, and troubleshooting of the RuoShui 8246A and 8246B Digital Benchtop Multimeters. These high-precision instruments are designed for accurate measurement of various electrical parameters in professional and educational settings.

The RuoShui 8246A and 8246B are advanced digital multimeters featuring 55000 counts, True RMS measurement, and a VFD dual display. They support PC communication via USB or RS232 interface for data recording and analysis.

2. Safety Information

To ensure safe operation and avoid damage to the instrument, please read and follow all safety precautions. Failure to observe these warnings may result in injury or damage to the multimeter.

• Always inspect the multimeter, test leads, and accessories for any damage before use. Do not use if damaged.
• Ensure the correct function and range are selected before making any measurements.
• Do not exceed the maximum input limits for any range.
• Be cautious when working with voltages above 30V AC RMS, 42V peak, or 60V DC, as these pose a shock hazard.
• Disconnect power to the circuit under test before connecting or disconnecting test leads.
• Use only the specified power supply voltage (100V~120V/220V~240V, 50Hz/60Hz).
• Do not operate the multimeter in wet environments or in the presence of explosive gases or dust.
• Refer to the rear panel for fuse specifications and replacement instructions.

3. Package Contents

Upon unpacking, please verify that all items listed below are present and undamaged:

• RuoShui 8246A or 8246B Digital Benchtop Multimeter
• Test Leads (H000005)
• Power Cable
• USB Serial Communication Line (H100002)
• User Manual
• Software CD

4. Product Overview

The RuoShui 8246A/8246B Digital Benchtop Multimeter features a clear VFD dual display and an intuitive control panel. Below is a diagram identifying the key components and their functions.

4.1 Front Panel Controls and Inputs

1. VFD dual display
2. Resistance gear
3. DC Voltage gear
4. Switch on-off
5. Support frame
6. Thermocouple Button
7. dBm Button
8. Max./Min. Button
9. Null Button
10. Input terminal
11. The base
12. Directional Button
13. Continuity Buzzer
14. Hold Button
15. Product function Settings
16. Storage Setting
17. RATE Button
18. The second function Button
19. Product function Settings

4.2 Rear Panel Connections

21. RS232 interface
22. USB interface
23. Power switch
24. The fuse
25. Power plug

5. Setup

5.1 Power Connection

1. Ensure the power switch on the rear panel is in the OFF position.
2. Connect the provided power cable to the power plug (25) on the rear panel of the multimeter.
3. Plug the other end of the power cable into a suitable AC power outlet (100V~120V or 220V~240V, 50Hz/60Hz).
4. Flip the power switch (23) to the ON position to power on the device.

5.2 PC Communication Setup

The multimeter supports data transfer to a PC via USB or RS232 interface for advanced data recording and analysis.

1. Install the software from the provided CD onto your computer.
2. Connect the USB serial communication line (H100002) to the USB interface (22) on the rear panel of the multimeter and to an available USB port on your PC. Alternatively, use an RS232 cable with the RS232 interface (21).
3. Launch the installed software on your PC.
4. Follow the software instructions to establish communication with the multimeter. The device uses an open-source SCPI protocol for communication.

6. Operating Modes

The RuoShui 8246A/8246B offers both auto and manual ranging capabilities. Use the function buttons on the front panel to select the desired measurement mode.

6.1 DC Voltage Measurement

• Ranges: 50mV, 500mV, 5V, 50V, 500V, 1000V
• Accuracy: 0.025% + 5 digits
• Resolution: 0.001mV
• Connect test leads to the appropriate input terminals (HI and LO).
• Select the DCV function. The multimeter will automatically select the range or you can manually select it.

6.2 AC Voltage Measurement

• Ranges (8246A): 5V, 50V (20Hz~50KHz); 500V, 1000V (20Hz~50KHz, 20Hz~1KHz)
• Accuracy (8246A): 0.5% + 30 digits (5V/50V), 0.7% + 30 digits (500V/1000V)
• Ranges (8246B): 5V, 50V, 500V, 1000V (20Hz~1KHz)
• Accuracy (8246B): 2% + 80 digits
• Resolution: 0.0001V (5V/50V), 0.01V (500V/1000V)
• Connect test leads to the appropriate input terminals.
• Select the ACV function.

6.3 DC Current Measurement

• Ranges: 500μA, 5000μA, 50mA, 500mA, 5A, 10A
• Accuracy: 0.15% + 20 digits
• Resolution: 0.01μA
• Connect test leads to the appropriate current input terminals (10A or mA) and the common terminal.
• Select the DCI function.

6.4 AC Current Measurement

• Ranges (8246A): 5A, 20A (20Hz~10KHz); 50mA, 500mA (20Hz~10KHz); 500uA, 5000uA (20Hz~10KHz)
• Accuracy (8246A): 2% + 8 digits (5A/20A), 0.001mA (50mA/500mA), 0.01uA (500uA/5000uA)
• Ranges (8246B): 5A, 20A (20Hz~1KHz); 50mA, 500mA (20Hz~1KHz); 500uA, 5000uA (20Hz~1KHz)
• Accuracy (8246B): 2% + 40 digits (5A/20A), 1.5% + 80 digits (50mA/500mA, 500uA/5000uA)
• Connect test leads to the appropriate current input terminals and the common terminal.
• Select the ACI function.

6.5 Resistance Measurement

• Ranges: 500Ω, 5KΩ, 50KΩ, 500KΩ, 5MΩ, 50MΩ
• Accuracy: 0.05% + 10 digits
• Resolution: 0.01Ω
• Connect test leads to the appropriate input terminals.
• Select the Ω function. The multimeter supports both four-wire and two-wire resistance measurements.

6.6 Capacitance Measurement

• Ranges: 10nF, 100nF, 1000nF, 10μF, 100μF, 1000μF, 10mF, 100mF
• Accuracy: 5% + 50 digits
• Resolution: 0.01nF
• Connect test leads to the appropriate input terminals.
• Select the Capacitance function.

6.7 Frequency Measurement

• Ranges: 10Hz, 100Hz, 1000Hz, 10kHz, 100kHz
• Accuracy: 0.02% + 4 digits
• Resolution: 0.0001Hz
• Connect test leads to the appropriate input terminals.
• Select the FREQ function.

6.8 Thermocouple (K-Type) Measurement

• Range: -200.0°C to 1360.0°C
• Accuracy: 1% + 10 digits
• Resolution: 0.1°C
• Connect a K-type thermocouple to the dedicated input terminals.
• Select the TC function. The multimeter provides automatic cold junction compensation and displays temperature in °C or °F.

6.9 Thermal Resistance (PT100) Measurement

• Range: -200°C to 850°C
• Accuracy: 1% + 5 digits
• Resolution: 1°C
• Connect a PT100 thermal resistance probe to the dedicated input terminals.
• Select the RTD function.

6.10 Diode Test

• Range: 2V
• Accuracy: 1% + 10 digits
• Connect test leads across the diode.
• Select the Diode function.

6.11 Continuity Test

• Range: 500Ω
• Threshold: ≤1000Ω
• Connect test leads across the circuit.
• Select the Continuity function. A buzzer will sound if continuity is detected.

6.12 Duty Cycle Measurement

• Range: 0.1% to 99%
• Accuracy: 1%
• Connect test leads to the appropriate input terminals.
• Select the Duty Cycle function.

6.13 Data Recording and Advanced Functions

• Data Hold: Press the HOLD button to freeze the current display reading.
• Max./Min./Avg Value: Use the MAX/MIN button to track maximum, minimum, and average readings.
• REL Value: Use the REL button for relative measurements.
• Data Storage: The multimeter can store up to 5000 groups of data. Data records can be configured with a start delay, record interval, and number of records.
• PC Communication: Utilize the provided software and USB/RS232 interface for real-time data monitoring, analysis, and export on a PC.

7. Specifications

Note: Specifications are subject to change without prior notice. For specific details or clarifications, please consult the manufacturer.

8. Maintenance

8.1 Cleaning

To clean the multimeter, wipe the case with a damp cloth and a mild detergent. Do not use abrasives or solvents. Ensure the device is powered off and disconnected from all power sources before cleaning.

8.2 Fuse Replacement

If the multimeter fails to power on or a current measurement range is inoperative, the fuse may need replacement. The fuse is located on the rear panel (24).

1. Ensure the multimeter is powered off and disconnected from the AC power supply.
2. Locate the fuse holder on the rear panel.
3. Carefully open the fuse holder.
4. Replace the old fuse with a new fuse of the exact same type and rating as specified on the device or in the full user manual.
5. Close the fuse holder securely.

WARNING: Using an incorrect fuse type can damage the instrument or pose a fire hazard.

9. Troubleshooting

If you encounter issues with your RuoShui 8246A/8246B multimeter, refer to the following common problems and solutions:

• No Display/Power: Check the power cable connection, ensure the power switch is ON, and verify the power outlet is functional. If still no power, check the fuse (see Maintenance section).
• Incorrect Readings: Verify that the correct function and range are selected for the measurement. Ensure test leads are properly connected and not damaged. Calibrate the device if necessary (refer to the full service manual for calibration procedures).
• PC Communication Failure: Ensure the USB/RS232 cable is securely connected to both the multimeter and the PC. Verify that the driver and software are correctly installed and running. Check the device manager on your PC to ensure the multimeter is recognized.
• Overload Indication: If the display shows "OL" or an overload symbol, the input signal exceeds the selected range. Switch to a higher range or reduce the input.

For persistent issues not covered here, please contact RuoShui customer support.

10. User Tips

• For highly accurate measurements, allow the multimeter to warm up for a few minutes after powering on.
• When measuring small resistances, use the four-wire measurement method for improved accuracy, if available on your model.
• Utilize the data recording feature for long-term monitoring or capturing intermittent events.
• Keep the software on your PC updated to ensure compatibility and access to the latest features.

11. Warranty and Support

RuoShui provides a standard warranty for its products. For detailed warranty terms, conditions, and duration, please refer to the warranty card included with your product or contact RuoShui customer service directly. Technical support is available through the manufacturer's official channels.

Contact Information: Please refer to the contact details provided in your product packaging or on the official RuoShui website for support inquiries.