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Prodigit 7550A Operation Manual

Precision current shunt
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7550A Precision
Current Shunt
Operation Manual
P/N: 9007550A01 REV: H

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Summary of Contents for Prodigit 7550A

  • Page 1 7550A Precision Current Shunt Operation Manual P/N: 9007550A01 REV: H...
  • Page 2 能会也可能不会含有所有所列的部件。This table shows where these substances may be found in the supply chain of Prodigit electronic information products, as of the date of sale of the enclosed product. Note that some of the component types listed above may or may not be a part of the enclosed product. ○：表示该有毒有害物...
  • Page 3 Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design, manufacture, and intended use of the instrument. PRODIGIT assumes no liability for the customer's failure to comply with these requirements.
  • Page 4 SAFETY SYMBOLS Direct current (DC) Alternating current (AC) Both direct alternating Three-phase alternating current Protective earth (ground) On (Supply) Off (Supply) Fuse Caution！Refer to this manual before using the meter. Caution, risk of electric shock CAT IV – Is for measurements performed at the source of the low-voltage installation. CAT III –...
  • Page 5 Current shunt Placement ..................6 Power Up ......................... 7 Bench mounting ....................... 7 2-10 Rack mounting ......................7 Chapter 3 Operation ........................8 3-1. 7550A current shunt Size description ..............8 3-2. Front panel description .................... 9 3-3. Instructions....................... 9 3-4. Protect ........................12 Chapter 4 Calibration ........................
  • Page 6 Fig 2-3 7550A Current shunt Placement ..................6 Fig 2-4 The viewing angle for bench-top use ................7 Fig 4-1 Potentiometer layout diagram ..................14 Fig 5-1 7550A Pecision current shunt block diagram ............... 16 Tables Table 1-1 7550A Specifications ....................2 Table 1-2 7550A Dimensions .....................
  • Page 8 Chapter 1 General information 1-1. Introduction The model 7550A precision current shunt is a precision AC/DC shunt. It incorporates five shunt ranges from 10Ω, 1Ω, 0.1Ω,0.01Ω to 0.001Ω. The AC/DC measuring current range from 20mA, 200mA, 2A, 20A to 220A (250Amax) full scale and a built-in 4 1/2 digit precision AC/DC current meter with〝AUTO-ZERO〞and〝AUTO-RANGE〞function.
  • Page 9 ＊ For Sinewave input ≧ 1800 count. ＊ The specifications apply when the 7550A is powered on for at least 30 minutes ＊ The typical not apply when 20A, 200A use over 50% range current and over 3 mins or the ON/OFF current period ratio less than 1/3.
  • Page 10 7550A Precision Current Shunt Operation Manual 3 1-3. Accessories PRODIGIT PART NO. DESCRIPTIONS Quantity 60300320 H5.5-8;HOOK TRML, YEL INS 60501080 GDL100;FUSE,5X20MM 0.10A,SLOW 60510080 GDL1;FUSE,5X20MM 1.00A, SLOW 60550081 GDL5;FUSE ,5X20MM 5.00A SLOW 74100350 RND SCREW M8X1.25 L=25mm NI 74200140 RND SCREW #6-32+S+P L=9/16" NI 74500110 NUT M8X1.25 NI...
  • Page 11 Chapter 2 Installation 2-1 Check line voltage The 7550A precision current shunt can be operated from a 100/115 or 200/230Vac input as indicated on the label on the rear panel. The input is switchable so please make sure that the switch is set correctly for your nominal mains input before turning on the mains power.
  • Page 12 If prior to exchanging the fuse, there is any abnormal noise or odour do not use the unit. Please inform your local sales office to organise repair of the 7550A. To avoid the risk of fire or electronic shock the fuse must only be replaced with same type and rating as the original.
  • Page 13 ・ Please ensure that no liquid is allowed to penetrate this product. 2-7 Current shunt Placement Place the Current shunt near the ground pin of the circuit. If this principle is not followed, the voltage drop generated by Current shunt may cause electric shock. Fig 2-3 7550A Current shunt Placement...
  • Page 14 Turn on (I) the POWER switch. 2-9 Bench mounting The 7550A are equipped with plastic feet and tilt stands in place ready for use as a bench instrument. A side handle is provided for easy portability. see figure 2-4 shows the viewing angle for bench-top use.
  • Page 15 8 PRODIGIT Chapter 3 Operation This chapter describes the front panel function and operation of each 7550A current shunt 3-1. 7550A current shunt Size description Fig 3-1 7550A SIZE description...
  • Page 16 It indicates the model number and specifications of 7550A Current shunt. 3.3.2. Range Select There are five operating range, the sequence is 250A, 200A, 20A, 2A, 0.2A, 20mA. Pressing the "250A" key on the 7550A current Shunt, the appropriate LED will Illuminate according to the operating range is selected.
  • Page 17 Pressing the "20A" key on the 1000A current Shunt, the appropriate LED will Illuminate according to the operating range is selected. Pressing the "2A" key on the 7550A current Shunt, the appropriate LED will Illuminate according to the operating range is selected.
  • Page 18 7550A Precision Current Shunt Operation Manual 11 3.3.3. AC/DC Select key Pressing the "AC/DC" key on the 7550A current Shunt, the appropriate LED will Illuminate according to the operating AC or DC mode is selected. 3.3.4. Current measurements The 7550A use a four terminal current shunt configuration. Two terminals (CURRENT INPUT) are connecting the load in series with the front panel terminals of the appropriate current shunt.
  • Page 19 2.Remove the top cover of instrument to replace the fuse. Top cover is removed by removing four screws. 3.Remove the defective fuse and replace it with the recommended fuse. (see table 3-1) or equivalent. PRODIGIT PART NO. REF. RANGE DESCRIPTIONS...
  • Page 20 Chapter 4 Calibration Introduction The 7550A should be calibrated, at intervals best determined by the user, It will be necessary to remove the top cover of instrument to gain access to the calibration adjustments. Top cover is removed by removing six screws. The adjust potentiometer and reference are shown on fig 4-1.
  • Page 21 14 PRODIGIT Fig 4-1 Potentiometer layout diagram...
  • Page 22 DC current meter calibration Connect the digital voltmeter to the VOLTAGE OUTPUT output terminals of the model 7550A. Press the key switch to the 20mA position and DC position. 4.4.1. OFFSET Disconnect all of the CURRENT INPUT input terminals, adjust VR8 (see fig 4-1) until the 4 1/2 digit current meter on the front panel is display 0.000mA.
  • Page 23 MAIN BD. VOLTAGE OUTPUT OFFSET 20mA VR11 10.5 GAIN RMS TO DC VR10 Reference 200mA OFFSET 1.05 4 1/2 DIGIT AC/DC AND AMPLIFIER AUTO-ZERO AUTO-RANGE 2.0A 0.105 SELECTOR GAIN 0.0105 0.00105 250A Fig 5-1 7550A Pecision current shunt block diagram...