Rigol DM3068 Service Manual
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Rigol DM3068 Service Manual

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RIGOL
Service Guide
DM3068 Digital Multimeter
Feb. 2014
RIGOL Technologies, Inc.

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Summary of Contents for Rigol DM3068

  • Page 1 RIGOL Service Guide DM3068 Digital Multimeter Feb. 2014 RIGOL Technologies, Inc.
  • Page 3 Notices RIGOL products are protected by patent law in and outside of P.R.C.  RIGOL reserves the right to modify or change parts of or all the specifications  and pricing policies at company’s sole decision. Information in this publication replaces all previously corresponding material.

  • Page 4: Safety Requirement

    Do Not Operate With Suspected Failures. If you suspect damage occurs to the instrument, have it inspected by qualified service personnel before further operations. Any maintenance, adjustment or replacement especially to circuits or accessories must be performed by RIGOL authorized personnel. Keep Well Ventilation.
  • Page 5 HI Sense and LO Sense/200 mA terminals are used for 4-wire resistance measurement and should be used under two conditions: 1) HI Sense-LO Sense/200 mA protection limit: 200 Vpk. 2) LO Sense/200 mA-LO protection limits: 0.5 Vpk. The current input fuse Service Guide for DM3068...
  • Page 6 DM3068 may be used to make measurements with the HI and LO inputs connected to mains in such devices (up to 300 VAC), or to the branch socket. , the HI and LO...
  • Page 7 RIGOL from mains. However, a transient overvoltage is also present in such circuits. DM3068 was designed to safely withstand occasional transient overvoltage up to 2500 Vpk. Do not use this device to measure circuits whose transient overvoltage may exceed this level.

  • Page 8: Safety Terms And Symbols

    CAUTION indicates a potential damage to the instrument or other property might occur. Symbols on the Product. These symbols may appear on the product: Hazardous Safety Protective Chassis Test Voltage Warning Earth Ground Ground Terminal Service Guide for DM3068...

  • Page 9: General Care And Cleaning

    CAUTION To avoid damages to the instrument, do not expose them to corrosive liquids. WARNING To avoid injury resulting from short circuit, make sure the instrument is completely dry before reconnecting into a power source. Service Guide for DM3068...

  • Page 10: Environmental Considerations

    Please contact your local authorities for disposal or recycling information. VIII Service Guide for DM3068...

  • Page 11: Document Overview

    Chapter 1 Specifications This chapter lists specifications and characteristics. Chapter 2 Performance Test This chapter introduces how to test the performance of DM3068 so as to know its state well. Chapter 3 Calibration This chapter provides information about the calibration of DM3068.

  • Page 12: Table Of Contents

    Disassembly & Assembly ........... 4-1 4. 1 Disassembly and Assembly Notices ..........4-1 4. 2 The 3D View of DM3068 ............... 4-2 4. 3 To Disassemble and Assemble Handle ..........4-3 4. 4 To Disassemble and Assemble Rear Panel ........4-4 4.
  • Page 13 5.1 Troubleshooting ................5-1 5.2 Maintenance and Cleaning ..............5-4 5.2.1 System Maintenance ............... 5-4 5.2.2 Principles of Circuit ..............5-4 5.2.3 Components Inspection ............5-6 5.2.4 Replaceable Part list ............... 5-10 5.2.5 Warranty ................5-12 Service Guide for DM3068...

  • Page 15: Chapter 1 Specifications

    0.040 + 0.001 0.0030 + 0.0004 100.0000MΩ 200nA || 10MΩ 0.300 + 0.010 0.800 + 0.010 0.800 + 0.010 0.1500 + 0.0002 Diode Test 2.0000V 0.002 + 0.010 0.008 + 0.020 0.010 + 0.020 0.0010 + 0.0020 Service Guide for DM3068...
  • Page 16 Typical value. Resolution is defined as the typical 20V range RMS noise (using auto zero “Once”). Normal mode rejection ratio for power-line frequency ±0.1%. For power-line frequency ±1%, subtract 20dB. For ±3%, subtract 30dB. Maximum rate for DCV, DCI, 2-wire resistance and 4-wire resistance functions. Service Guide for DM3068...
  • Page 17 Selectable 4-wire or 2-wire resistance Current source referenced to LO input Open-circuit Voltage Limited to <10V Max. Lead Resistance 10% of range per lead for 200 Ω, 2 kΩ ranges, 1 kΩ per lead on all other ranges (4-wire) Service Guide for DM3068...
  • Page 18 Reading settling times are affected by source impedance, cable dielectric characteristics and input signal changes. The default measurement delay is selected to give first reading right for most measurements. Measurement Considerations Telon or other high-impedance, low-dielectric absorption wire insulation is recommended for these measurements. Service Guide for DM3068...

  • Page 19: Ac Characteristics

    0.35 + 0.02 0.35 + 0.03 0.35 + 0.03 0.035 + 0.003 10Hz-20kHz 0.04 + 0.02 0.07 + 0.03 0.08 + 0.03 0.008 + 0.003 20kHz-50kHz 0.10 + 0.04 0.12 + 0.05 0.15 + 0.05 0.012 + 0.005 Service Guide for DM3068...
  • Page 20 0.15 + 0.06 0.15 + 0.06 0.015 + 0.006 5kHz-10kHz 0.35 + 0.70 0.35 + 0.70 0.35 + 0.70 0.030 + 0.006 10.00000A 3Hz-5Hz 1.10 + 0.08 1.10 + 0.10 1.10 + 0.10 0.100 + 0.008 Service Guide for DM3068...
  • Page 21 ≤ 5 at full range Input Impedance 1MΩ ± 2% in parallel with <150pF capacitance on any range Input Protection 750V rms on all ranges AC Filter Bandwidth Slow: 3Hz - 300kHz Medium: 20Hz - 300kHz Fast: 200Hz - 300kHz Service Guide for DM3068...
  • Page 22 Applying >300Vrms (or >5Arms) will cause self-heating in signal-conditioning components and these error are included in the instrument specifications. Internal temperature changes due to self-heating may cause additional error on lower ac voltage ranges. The additional error will be lower than 0.02% of reading and will generally dissipate within a few minutes. Service Guide for DM3068...

  • Page 23: Frequency And Period Characteristics

    110% of range of the AC input voltage. The maximum input is limited to 750V rms or 8 x 10 Volts-Hz (whichever is less). 200mV range is full range input or input that is larger than the full range. For 20mV to 200mV, multiply % of reading error ×10. Relative to calibration standards. Service Guide for DM3068...
  • Page 24 Errors will occur when attempting to measure the frequency or period of an input following a dc offset voltage change. Make sure the RC circuit of input terminal has been fully settled (about 1s) before accurate measurement. 1-10 Service Guide for DM3068...

  • Page 25: Capacitance Characteristics

    Apply constant current into the capacitance, and measure the voltage changing rate. Connection Type 2-wire Measurement Considerations Since small capacitance measurements are susceptible to the external noise, shielding inputs from external noise pickup is critical for minimizing measurement errors. Service Guide for DM3068 1-11...

  • Page 26: Temperature Characteristics

    Specification is for 4WR sensor measurement or 2WR measurement using REL operation. Relative to cold junction temperature, accuracy is based on ITS-90. Built-in cold junction temperature refers to the temperature inside the banana jack and its accuracy is ±2.5 ℃. 1-12 Service Guide for DM3068...
  • Page 27 The built-in cold junction temperature tracks the temperature inside the banana jack. The change of the temperature in banana jack might cause additional error. When using the built-in cold junction compensation, connect the sensor terminal of the thermocouple to the banana jack and warm it up for more than 3 minutes to minimize the error. Service Guide for DM3068 1-13...

  • Page 28: Measurement Rate

    The maximum rate available when trigger delay is set to 0. 20V range, fast filter, 1kHz input. Measure 20nF capacitance on 200nF range. The measurement period changes with the capacitance under test. The maximum measurement period on 100mF is 4s (typical value). 1-14 Service Guide for DM3068...

  • Page 29: Other Measurement Characteristics

    512k reading history data record Non-volatile Memory 10 sets history data storage (5000 readings/group) 5 sets sensor data storage (5000 readings/group) 10 sets instrument setup storage 5 sets Anysensor setup storage Support USB flash device backup data and setting. Service Guide for DM3068 1-15...

  • Page 30: General Specifications

    About 3.2 kg (without package) Dimension (h×w×l): 107.0mm×231.6mm×290.5mm Remote Interface GPIB, 10/100Mbit LAN, USB 2.0 Full Speed Device & Host (support USB flash device), RS-232C Programming Language SCPI LXI Compatibility LXI Class C, Version 1.2 Warm-up Time 90 minutes 1-16 Service Guide for DM3068...

  • Page 31: Chapter 2 Performance Test

    2. 1 Test Type The performance test is used to check the measurement performance of the multimeter based on the specifications listed in User’s Guide for DM3068 or “Specifications” in this book. The DM3068 supports Self-test, Fast test and Routine Test. Below is the detailed information.
  • Page 32 So please do not start the self-test until you have disconnected all input connections. The meter failed the self-test must be calibrated or repaired before it is put back into use. Service Guide for DM3068...

  • Page 33: Fast Test

    The fast test does not apply to the units with an abnormality in some certain functions. The meter failed to pass the routine test must be calibrated or repaired before it is put back into use. Service Guide for DM3068...

  • Page 34: Routine Test

    The meter passed the routine test must be tested again when the test time interval is exceeded. The meter failed to pass the routine test must be calibrated or repaired before it is put back into use. Service Guide for DM3068...

  • Page 35: Testing Equipments

    <1/5 dmm 24 hour spec. AC Current Fluke 5520A <1/5 dmm 24 hour spec. Frequency Fluke 5520A <1/5 dmm 24 hour spec. Capacitance Fluke 5520A <1/5 dmm 24 hour spec. Remark : Agilent 3458A (contain accessory 002) characterizes Fluke 5520A. Service Guide for DM3068...

  • Page 36: Test Conditions

    7. Ground the shield of both twisted-pair and coaxial-cable, as well as the LO terminal of calibrator (unless otherwise specified). The DM3068 was designed for high precision, you must be more careful while testing or calibrating in order to avoid errors. In an optimal situation, the accuracy of test and calibration standard source must be four times at least than that of the test instrument.

  • Page 37: Input Connections

    But please note the terminals HI, LO, HI-Sense and LO-Sense must be used through a coaxial cable and the shielding layer must be grounded so as to reduce the influence from low thermoemf and exterior interference. HI-Sense LO-Sense /200mA Figure 2-1 Input terminals Service Guide for DM3068...

  • Page 38: Routine Test

    ±6mV ±10mV ±10mV DC Current 200.000μA open ±24nA ±30nA ±30nA 2.00000mA open ±60nA ±60nA ±60nA 20.0000mA open ±2.4μA ±3μA ±3μA 200.000mA open ±4μA ±6μA ±6μA 2.00000A open ±400μA ±400μA ±400μA 10.0000A open ±1mA ±1mA ±1mA Service Guide for DM3068...
  • Page 39 [1] The integration time is set to 100PLC. [2] Specifications are for 4-wire or 2-wire resistance measurement using “REL” operation. If 2-wire resistance measurement is used without REL operation, add 0.2 Ω additional errors. [3] Q denotes the optional quick test point. Service Guide for DM3068...

  • Page 40: Gain Test

    -10A ±11mA ±13mA ±16mA Resistance 200.0000Ω 200Ω ±12mΩ ±24mΩ ±28mΩ 2.000000kΩ 2kΩ ±50mΩ ±180mΩ ±220mΩ 20.00000kΩ 20kΩ ±500mΩ ±1.8Ω ±2.2Ω 200.0000kΩ 200kΩ ±5Ω ±18Ω ±22Ω 1.000000MΩ 1MΩ ±30Ω ±110Ω ±130Ω 10.00000MΩ 10MΩ ±1.6kΩ ±3.1kΩ ±4.1kΩ 2-10 Service Guide for DM3068...
  • Page 41 ±340mV ±400mV 200V 100kHz ±1.26V ±1.36V ±1.36V 750.00 V 320V 45Hz ±278mV ±449mV ±481mV 320V 20kHz ±278mV ±449mV ±481mV 320V 50kHz ±620mV ±759mV ±855mV 320V 100kHz ±2.36V ±2.52V ±2.52V 750V 10kHz ±450mV ±750mV ±825mV Remarks: Service Guide for DM3068 2-11...
  • Page 42 (3) Select range according to table 2-7 and disable the math function. (4) Input signals in accordance with the table below using the calibrator and compare the results with the limits from the table (make sure the calibrator 2-12 Service Guide for DM3068...
  • Page 43 ±260pF 200.0nF 200nF ±2.6nF 2.000uF ±26nF 20.00uF 20uF ±260nF 200.0uF 200uF ±2.6μF 2.000mF ±26μF 20.00mF 20mF ±260μF 100.0mF 100mF ±3.2mF Remarks: [1] Specifications under the REL operation. [2] Q denotes the optional quick test point. Service Guide for DM3068 2-13...

  • Page 45: Chapter 3 Calibration

    Even though the meter has passed the performance test, the specifications (see “Specifications”) cannot be guaranteed unless recalibration is done. 3. 3 To Obtain Calibration Service As the DM3068 does not support user calibration, please send your meter back to us for professional calibration when necessary. Service Guide for DM3068...

  • Page 47: Chapter 4 Disassembly & Assembly

    Prevent metallic parts from transfiguration and scratch when disassembling  metal parts Tools: Club screwdriver T10, T15  Diagonal cutting pliers  WARNING Make sure the power is cut off before disassembling. The operator should have been trained or have related qualification. Service Guide for DM3068...

  • Page 48: The 3D View Of Dm3068

    Chapter 4 Disassembly & Assembly 4. 2 The 3D View of DM3068 Below is the 3D view of the DM3068 which will help you get a primary understanding of the main parts of the instrument before disassembling or assembling. You need to...

  • Page 49: To Disassemble And Assemble Handle

    4. 3 To Disassemble and Assemble Handle To remove the handle, grasp it by the sides and pull outward, then rotate the handle until it is out of the meter body (see figure below). Figure 4-2 To disassemble and assemble handle Service Guide for DM3068...

  • Page 50: To Disassemble And Assemble Rear Panel

    RIGOL Chapter 4 Disassembly & Assembly 4. 4 To Disassemble and Assemble Rear Panel Figure 4-3 To disassemble and assemble rear panel Service Guide for DM3068...

  • Page 51: To Disassemble And Assemble Metallic Shell

    Chapter 4 Disassembly & Assembly RIGOL 4. 5 To Disassemble and Assemble Metallic Shell Figure 4-4 To disassemble and assemble metallic shell Service Guide for DM3068...

  • Page 52: To Disassemble And Assemble Fuse Seat

    RIGOL Chapter 4 Disassembly & Assembly 4. 6 To Disassemble and Assemble Fuse Seat Figure 4-5 To disassemble and assemble fuse seat Service Guide for DM3068...

  • Page 53: To Disassemble And Assemble Gpib Pcb

    Chapter 4 Disassembly & Assembly RIGOL 4. 7 To Disassemble and Assemble GPIB PCB Figure 4-6 To disassemble and assemble GPIB PCB Service Guide for DM3068...

  • Page 54: To Disassemble And Assemble Filter Board & Transformer

    RIGOL Chapter 4 Disassembly & Assembly 4. 8 To Disassemble and Assemble Filter Board & Transformer Figure 4-7 To disassemble and assemble filter board & transformer Service Guide for DM3068...

  • Page 55: To Disassemble And Assemble Front Panel & Lcd

    Chapter 4 Disassembly & Assembly RIGOL 4. 9 To Disassemble and Assemble Front Panel & LCD Figure 4-8 To disassemble and assemble front panel & LCD Service Guide for DM3068...

  • Page 56: To Disassemble And Assemble The Fan

    RIGOL Chapter 4 Disassembly & Assembly 4. 10 To Disassemble and Assemble the Fan Figure 4-9 To disassemble and assemble the fan 4-10 Service Guide for DM3068...

  • Page 57: To Disassemble And Assemble Mainboard

    Chapter 4 Disassembly & Assembly RIGOL 4. 11 To Disassemble and Assemble Mainboard Figure 4-10 To disassemble and assemble mainboard 4-11 Service Guide for DM3068...

  • Page 58: To Disassemble And Assemble Keypad Pcb

    4. 12 To Disassemble and Assemble Keypad PCB Figure 4-11 To disassemble and assemble keypad PCB Please try to assemble and disassemble your instrument as above orders or directions to avoid damages to the meter and save time. 4-12 Service Guide for DM3068...

  • Page 59: Chapter 5 Troubleshooting & Maintenance

    (4) Check the power fuse on the back and replace a new one if the fuse is blown out. (5) Check if the voltage selector is switched to a right level. (6) If the unit still cannot work properly, contact your local RIGOL distributor. Power indicator status Always on: the meter is working...
  • Page 60 (4) Try to disable the print function if a command is desired for the meter control. 8. Cannot connect to the meter through GPIB interface: (1) Check if the GPIB address is correct (refer to the Interface Configurations of the User’s Guide for DM3068). Service Guide for DM3068...
  • Page 61 10. Cannot connect to the meter through USB interface: (1) Check the USB connection. (2) Check the driver you are using, have a newest from RIGOL website if desired. (3) Check if the software can correctly identify the meter if multiple USB devices are connected to your PC.

  • Page 62: Maintenance And Cleaning

    5． Keep the accessories for next using. 5.2.2 Principles of Circuit The DM3068 used a circuit containing a floating, grounding and power circuit. 1. The floating circuit includes the current fuse, signal input end on the front panel (banana socket), measurement analog front-end and the main voltage stabilizing circuits.
  • Page 63 Banana Socket Power Input Floating Circuit Figure 5-2 DM3068 circuit principles 2. The grounding circuit contains most circuits such as keypad, LCD, USB Host, LAN/GPIB board, Trig/VMC port, fan and CPU. 3. The AC supply enters the meter through the wire and flows through filter board to transformer.

  • Page 64: Components Inspection

    In this part, you will get more information concerning the fault location for removing advanced malfunction. 1. Fuse The DM3068 has three types of fuse, which are: power fuse, current input fuse on the rear panel and internal current input fuse on the mainboard, the parameters are as follows:...
  • Page 65 3. Screen DM3068 provides a LCD self-check program for users to inspect the light spot, and dark spot of the LCD, the backlight and the display control circuit. Inspection method:...
  • Page 66 Before replacing the parts, please try to pull out the connecting line between LCD and mainboard and reconnect and test to get rid of connectivity failure. 4. Keypad The DM3068 provides a self-check program to inspect whether the button and backlight from the panel are normal. Inspection method:...
  • Page 67 Chapter 5 Troubleshooting & Maintenance RIGOL WARNING If a failure occurs, contact RIGOL and never disassemble the instrument by yourself to avoid accident or losing. Service Guide for DM3068...

  • Page 68: Replaceable Part List

    RIGOL Chapter 5 Troubleshooting & Maintenance 5.2.4 Replaceable Part list RIGOL provides some replaceable parts for you to maintain or update the meter, which are: Table 5-2 Replaceable Part List Part No. Name Quantity Front panel Handle Rubber keypad Banana socket...
  • Page 69 Cross recessed small pan head screws GB Cross recessed pan head tapping screws GB Cross recessed pan head screws GB Cross recessed pan head screws GB NOTE: For an order of above parts please contact RIGOL authorized distributor. Service Guide for DM3068 5-11...

  • Page 70: Warranty

    To get repair service, please contact with your nearest RIGOL sales and service office. RIGOL does not provide any other warranty items except the one being provided by this summary and the warranty statement. The warranty items include but not being subjected to the hint guarantee items related to tradable characteristic and any particular purpose.

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