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Sanwa DG525 Instruction Manual

Digital insulation meter
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DIGITAL INSULATION METER
INSTRUCTION MANUAL

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Summary of Contents for Sanwa DG525

  • Page 1 DIGITAL INSULATION METER INSTRUCTION MANUAL...
  • Page 2 [1] Safety Precautions — Be sure to read before use. — Be sure to read carefully the information under “ WARNING” and “ CAUTION” in this manual in order to prevent human injuries, electric shock and damage to the instrument as well as other equipment.
  • Page 3 1-2 Warning Messages for Safety WARNING 1. Check the measurement type (insulation resistance or AC voltage) before measurement and select the appropriate function for it. 2. Do not apply a voltage or signal exceeding the specified maximum allowable input. (For the maximum allowable input voltage value, see section 1-3 on the next page.) 3.

  • Page 4: Outline And Features

    1. Each instrument is capable of switching the voltages applied during insulation resistance measurement in the following 2 ranges. Model DG525: 500 V DC/250 V DC Model DG251: 250 V DC/125 V DC 2. With both measuring functions, automatic range switching can be used to switch the range according to the measurement value.
  • Page 5 [3] External View and Names of Parts TL-M54 (5) INSUL. TEST VOLT ON (1) Measuring terminals (Insulation test voltage ON) (Common for insulation indicator (red LED) resistance and AC voltage) (6) Function switch (2) LCD (Liquid Crystal Display) (7) LIGHT (back-light) switch panel (8) Red test lead (for L/ 〜...
  • Page 6 [4] Measurements 4-1 Preparation Before Measurement WARNING For safe use of the instrument, check its appearance and associated accessories carefully before use. 1. Check for damage due to dropping, etc. 2. There is a risk of electric shock if the insulation coating of a test lead or its conductor wire is exposed.
  • Page 7 4-2 Checking the Built-in Batteries 1. Do not connect any leads to the measuring terminals. 2. Set the function switch to 500 V or 250 V with Model DG525 or to 250 V or 125 V with Model DG251. 3. Press the POWER switch.
  • Page 8 4-3 Replacing the Built-in Batteries 1. Set the function switch to OFF on the center position. WARNING Make sure that the function switch is set to OFF before proceeding to the battery replacement operation. 2. Refer to Fig. 3 below for the battery replacement. 3.
  • Page 9 1. Set the function switch according to the measurement object, to 500 V or 250 V with Model DG525 or to 250 V or 125 V with Model DG251. 2. Connect the black plug of the black test lead to the E terminal on the left and the amber plug of the red test lead to the L terminal on the right as shown in Fig.
  • Page 10 4. When the measurement object has resistance of more than 2000 MΩ, the LCD shows the same over-input display as that displayed when the measuring terminals are open, as shown in Fig. 1 under section [4]4-2, “Checking the Built-in Batteries” on page 6. 5.

  • Page 11: Maintenance And Management

    1. Set the function switch to ACV. 2. Connect the amber plug of the red test lead to the ~(L) terminal on the right and the black plug of the black test lead to the ~(E) terminal on the left as shown in Fig. 4 under section [4]4-4, “Measuring the Insulation Resistance”...
  • Page 12 3. Check that the function switch is not subject to strong pressure from above. (This could lead to a contact failure of the switch.) If the instrument cannot comply with any of the above checks, do not use it as it is. Service the defective part or replace it with a new part.

  • Page 13: Specifications

    DG251: 250 V DC/125 V DC, 2 ranges 2. Measuring voltage/current characteristics When measuring terminals are open DG525: 500 V DC range — 600 V (+20% max.) > 500 V guaranteed at 500 kΩ 250 V DC range — 300 V (+20% max.) >...
  • Page 14 6-3 Common Specifications 1. A/D converter Operating system: Double integration Sampling rate: Approx. 2.5 samplings/sec. 2. Display LCD, max. 1999 3. Over-input indication Only the highest digit shows “1”. 4. Measuring terminals MΩ: E, L. ACV: 〜, 〜 5. Operating temperature/humidity range 0 to 40 C, ≤...
  • Page 15 MEMO – 14 –...
  • Page 16 04.09 猯...

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Dg251