FLUKE 5500A-COIL INST SHEET 电路图.pdf

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1、PN 600616 August 1995 Rev.6, 12/02 1995, 1999, 2002 Fluke Corporation. All rights reserved. Printed in U.S.A. Product names are trademarks of their respective companies. Instruction Sheet Model 5500A/COIL 50-Turn Current Coil Introduction The 5500A/COIL is a 50-Turn Current Coil used as a tool for c

2、alibrating clamp-type current meters that operate by two different principlesas current transformers (AC only), and by the Hall Effect (Both AC and DC). It is impractical to calibrate 1000A rated current clamp meters using a 1000A source. How- ever, by using the 50 turns of the 5500A/COIL in conjunc

3、tion with a current source calibrator one can ef- fectively multiply the current of the current source calibrator by a factor of 50 to support the calibration and verification of these clamp-type current meters. ?WARNING UNFUSED. Exceeding current and voltage ratings can cause burn or fire hazard. U

4、sing the Coil Clamp-type current meters operate as current transformers, with differing degrees of magnetic coupling between primary and secondary that vary from meter to meter. The position of the clamp meter with re- spect to the cable also affects the magnetic coupling between primary and seconda

5、ry of the current trans- former, which causes variation in reading of the current meter. This is important to under- stand in order to make the most accurate and repeatable measurements. The base of the 5500A/COIL was designed so the current clamp can be centered carefully on the coil, minimizing op

6、erator error for best repeatabil- ity. Calibration accuracy to specifications is guaranteed only when proper clamp alignment is made. The clamp current meter should be centered as much as possible on the base dur- ing calibration and verification. If the clamp- type current meter has alignment marks

7、, the alignment marks should align the clamp with the center bundled wire of the 50-Turn 5500A/COIL. (See Figure 1). Figure 1. Positioning the Clamp RadioFans.CN 收音机爱 好者资料库 Specifications Number of Turns50 Maximum Current11A rms, continuous 20.5A rms, 2 minutes Maximum Duty Cycle Derating 11A, 2 min

8、utes ON, 8 minutes OFF Maximum Voltage3V rms Minimum Inner Diameter of Clamp Jaws2.54 cm 1” Specification for Clamp Meter/Coil interaction Calculating Total Specification The total specification of the effective current that the clamp-type meter measures is a function of the clamp/coil interaction a

9、nd of the current calibrator. To determine the total specification use the follow- ing formula: source 2 coil 2 total USS+= Example: Assume we are driving the coil with the Fluke 5500A at 4A, 60 Hz (the clamp meter will see an effective current of 200A, 60 Hz) and we are calibrating a toroidal-type

10、clamp meter. The Calibrators 1 year specification at 4 Amps is (0.06% + 2 mA), so the effective current in the coil bundle will have a speci- fication of (0.06% + 0.1A). Next, we find the total specification of the calibrator and the coil as a per- centage of the output: Specification of effective c

11、alibrator current in coil bundle = (0.06% + 0.1A) = 0.11% Specification due to clamp Meter/Coil Interaction = (0.28% + 0.09A) = 0.325% The RSS of these two specifications determines the total specification of the clamp/source combination: %343. 0%11. 0%325. 0 22 total =+=S Effective Current Output F

12、requencyAmp-turns 0.2 - 0.33A DC10 - 16.49990.250.0020.500.02 0.33 - 2.9999 A DC16.5 - 149.9990.250.0150.50.14 3.0 - 20.5A DC150 - 10250.250.050.50.5 0.2 - 0.33A 45 Hz to 65 Hz10 - 16.49990.280.0030.560.03 0.33 - 2.9999 A 45 Hz to 65 Hz16.5 - 149.9990.280.0250.560.25 3.0 - 20.5A 45 Hz to 65 Hz150 -

13、10250.280.090.560.9 0.2 - 0.33A 65 Hz to 440 Hz10 - 16.49990.790.0031.000.03 0.33 - 2.9999 A 65 Hz to 440 Hz16.5 - 149.9990.790.0271.000.25 3.0 - 20.5*A 65 Hz to 440 Hz150 - 10250.790.11.000.9 Specification for 5500A/COIL CalibratorCoil Specifications clamp/coil interaction OutputToroidal-type Clampsother-type of Clamps Magnitude(% of output + Amps)(% of output + Amps) such as the Fluke 80i-600such as the Fluke 80i-KW, -400, and 80I-100080i-410, -500, -1010 and 30-series RadioFans.CN 收音机爱 好者资料库