1. Introduction
This manual provides comprehensive instructions for the safe and effective operation, maintenance, and troubleshooting of the Rigol DM3068 6 1/2 Digit Benchtop Digital Multimeter. Please read this manual thoroughly before using the instrument to ensure proper functionality and to prevent damage or injury.
2. Safety Information
Always observe the following safety precautions when operating the DM3068 multimeter:
- Do not operate the instrument in an explosive atmosphere or in the presence of flammable gases or fumes.
- Ensure the power cord is properly connected to a grounded outlet.
- Do not apply voltage or current exceeding the specified maximum input limits. Refer to the specifications section for details.
- Use only test leads and accessories supplied or recommended by Rigol.
- Before opening the instrument cover, disconnect the power cord and all test leads.
- Do not operate the instrument if it appears damaged or is not functioning correctly.
- Always connect the common (COM) test lead before connecting the live test lead. Disconnect the live test lead first.
- Be aware of the CAT I (1000V) and CAT II (300V) ratings for the input terminals.
3. Product Overview
The Rigol DM3068 is a high-performance 6 1/2 digit benchtop digital multimeter designed for precise measurements in various applications. Key features include:
- Real 6 1/2 digits resolution for high accuracy.
- Dual display capability for simultaneous AC signal measurement.
- "Any sensor" function for versatile sensor integration.
- Support for multiple temperature sensors (TC, RTD, THERM).
- Standard capacitor measurement function.
- LXI over LAN and USB connectivity for remote control and data acquisition.
3.1 Front Panel
The front panel features the display, function buttons, range controls, and input terminals. Refer to the image below for a visual representation.
Figure 3.1: Front view of the Rigol DM3068 Digital Multimeter, showing the display, control buttons, and input terminals.
- Display: Shows measurement readings, settings, and menu options.
- Function Buttons: Select measurement modes (DCV, ACV, Resistance, Current, Frequency, Capacitance, Diode, Continuity, Temperature).
- Range Controls: Manual range selection (Rng+, Rng-) or Auto-ranging (Auto).
- Input Terminals: Dedicated terminals for voltage (VΩ), current (mA, 10A), and common (COM) measurements.
- USB Host Port: For connecting USB storage devices.
3.2 Rear Panel
The rear panel includes the power input, communication interfaces, and other connectors. (Specific image for rear panel not available, general description provided).
- AC Power Input: For connecting the power cord.
- USB Device Port: For connecting to a computer.
- LAN Port: For network connectivity (LXI).
- RS-232 Port: For serial communication.
4. Setup
4.1 Unpacking and Inspection
Upon receiving your DM3068, carefully inspect the packaging for any signs of damage. Open the box and verify that all components listed in the packing list are present and undamaged. If any items are missing or damaged, contact your supplier immediately.
4.2 Power Connection
- Ensure the power switch on the rear panel is in the OFF position.
- Connect the provided AC power cord to the power input on the rear panel of the instrument.
- Plug the other end of the power cord into a grounded AC power outlet.
4.3 Initial Power-On
After connecting the power, press the power button on the front panel. The instrument will perform a self-test and display the startup screen. Allow a few minutes for the instrument to warm up and stabilize for optimal measurement accuracy.
5. Operating Instructions
5.1 Basic Measurements
To perform a basic measurement, select the desired function using the dedicated buttons on the front panel. Connect the test leads to the appropriate input terminals (VΩ for voltage/resistance, mA/10A for current, COM for common) and to the circuit under test.
5.1.1 DC Voltage Measurement (DCV)
- Press the DCV button.
- Connect the red test lead to the VΩ terminal and the black test lead to the COM terminal.
- Connect the test leads across the component or circuit to measure DC voltage.
Figure 5.1: Display showing a DC Voltage measurement of 2.000,001V.
5.1.2 AC Voltage Measurement (ACV)
The DM3068 supports dual display for AC signal measurements, showing both voltage and frequency simultaneously.
- Press the ACV button.
- Connect the test leads as described for DCV.
- The display will show the AC voltage and its frequency.
Figure 5.2: Display showing an AC Voltage measurement of 199.9999mV and a frequency of 1.000000kHz.
5.1.3 Capacitance Measurement
The DM3068 includes a standard capacitance measurement function.
- Press the CAP button.
- Ensure the capacitor is discharged before connecting it to the VΩ and COM terminals.
- The display will show the capacitance value.
Figure 5.3: Display showing a Capacitance measurement of 1.000nF.
5.2 Temperature and Sensor Measurements
The "Any sensor" function allows for flexible integration of various sensors, including multiple types of temperature sensors.
- Press the Sensor button.
- Use the menu to select the sensor type (e.g., TC for Thermocouple, RTD for Resistance Temperature Detector, THERM for Thermistor).
- Connect the sensor to the appropriate input terminals as per the on-screen instructions.
- The display will show the temperature reading.
Figure 5.4: Display showing a temperature reading of 19.05305 °C from a sensor.
Figure 5.5: Display showing the selection menu for sensor types, including TC, RTD, and THERM.
5.3 Data Logging and Analysis
The DM3068 offers advanced data logging and statistical analysis features.
5.3.1 History and Trend View
The instrument can store up to 5000 readings in its history. The Trend View function allows you to visualize the development of measurements over time directly on the display.
- Press the History button to access stored readings.
- Navigate to the Trend View option to display a graphical representation of the data.
Figure 5.6: Display showing a Trend View of measurements over time, including Max and Min values.
5.3.2 Statistical Analysis
The DM3068 can perform statistical analysis on recorded data, including histograms and various statistical parameters.
- Access the Math or Utility menu.
- Select the Statistics option to view parameters like average (AVG), standard deviation (SDEV), and to display a histogram of the data.
Figure 5.7: Display showing a histogram of measurement data.
Figure 5.8: Display showing the Statistics menu with options for STA (Statistical Analysis), P/F (Pass/Fail), dBm, dB, and REL (Relative).
6. Maintenance
6.1 Cleaning
To clean the instrument, disconnect it from all power sources and test circuits. Use a soft cloth dampened with mild detergent and water. Do not use abrasive cleaners or solvents. Ensure no moisture enters the instrument.
6.2 Fuse Replacement
The DM3068 contains internal fuses for protection. If a current measurement range becomes inoperative, a fuse may need replacement. Fuse replacement should only be performed by qualified service personnel to avoid voiding the warranty or causing further damage. Note that the 200mA current input fuse is internal and not user-replaceable from the rear panel, despite any markings.
6.3 Calibration
For optimal accuracy, the DM3068 should be calibrated periodically by a qualified service center. Refer to Rigol's official documentation or contact support for recommended calibration intervals.
7. Troubleshooting
This section provides solutions to common issues encountered with the DM3068. For more detailed assistance, refer to the instrument's built-in "Online Help" function or contact Rigol technical support.
| Problem | Possible Cause | Solution |
|---|---|---|
| Instrument does not power on. | Power cord not connected; power outlet faulty; internal fuse blown. | Check power cord connection; test power outlet; contact service for fuse replacement. |
| No reading or "OL" displayed. | Test leads not connected properly; circuit open; measurement range exceeded. | Verify test lead connections; check circuit continuity; select a higher measurement range or use auto-ranging. |
| Incorrect readings. | Wrong measurement function selected; poor test lead contact; instrument not calibrated. | Select correct function; ensure good contact; consider calibration. |
| Communication (USB/LAN) issues. | Incorrect cable; driver not installed; network configuration error. | Verify cable type and connection; install necessary drivers; check network settings. |
| Data logging stops prematurely. | Memory limit reached (5000 readings). | Transfer data to external storage or clear history. Note the 5000-reading limit. |
8. Specifications
The following table outlines the general specifications for the Rigol DM3068 Digital Multimeter.
| Parameter | Value |
|---|---|
| Brand | Rigol |
| Model Number | DM3068 |
| Measurement Type | Multimeter |
| Resolution | 6 1/2 Digits |
| Power Source | AC |
| Item Weight | 5.5 pounds (2.5 Kilograms) |
| Product Dimensions (L x W x H) | 9.12 x 11.44 x 4.21 inches |
| Specification Met | UL 61010-1, IEC 61010-2-030, NIST Traceable |
| Connectivity | USB, LAN (LXI), RS-232 |
| Data Logging Capacity | Up to 5000 readings |
9. Warranty and Support
For information regarding the product warranty, technical support, or service, please refer to the official Rigol website or contact your local Rigol distributor. Ensure you have your product model number (DM3068) and serial number available when seeking support.
Rigol Technologies USA Inc. is the manufacturer.
Official Rigol Website: www.rigolna.com
