1
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R
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DC resistance
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pin 1-3, limits <135 mOhms
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To check the total primary winding resistance is below a maximum. Also acts as a check of correct wire gauge and good termination.
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2
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R
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DC resistance
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pin 4-5, limits <100 mOhms
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To check the feedback winding resistance is below a maximum. Also acts as a check of correct wire gauge and good termination.
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3
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R
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DC resistance
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pin 10-6, limits <175 Ohms
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To check the secondary winding resistance is below a maximum. Also acts as a check of correct wire gauge and good termination.
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4
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LS
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Series Inductance
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Pin 1-3, 100mV, 20 KHz, nominal 27 uH +/- 10% (as per published spec)
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Inductance as seen by the primary. To check the correct number of turns and correct operation of the core material
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5
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TR
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Turns Ratio
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Energize pins 1-3, 100mV 40 kHz, check Turns ratio and phase 1-2:2-3 to be 1:1 +/- 5%
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To check correct ratio of windings between the two halves of the primary to the centre tap.
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6
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TR
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Turns Ratio
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Energize pins 1-3, 100mV 40 kHz, check Turns ratio and phase 1-3:4-5 to be 4.6:1 +/- 5%
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To check correct ratio of windings from whole of the primary to the feedback winding.
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7
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TR
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Turns Ratio
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Energize pins 10-6, 100 mV 10 kHz, check Turns ratio and phase 10-6:1:3 to be 86:1 +/- 5%
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To check correct ratio of windings from secondary to primary. The winding with the most turns is energised as this is best practice for optimum accuracy.
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8
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LL
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Leakage Inductance
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Pins 1-3 Hi, Pins 10-6 Low, 100mV, 40 kHz , check leakage is below 6.5 uH
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To check leakage is below specified limit as a validation of correct placement and operation of windings.
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9
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SURG
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Surge Stress Test
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Energize pins 10-6, 4000V, 5 pulses. Check that mVs product is 166 mVs +/- 30%
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To check for weak points in the secondary inter turn insulation, to prove longevity of the part over its operational life.
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10
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HPAC
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AC Hi-Pot
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2 kV AC,50Hz 1 second, Pins 1,2,3,4,5 High, Pins 10,6 LO. Check <15 mA current
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To check isolation as per datasheet.
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AT5600 Run time 2.61 sec
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(AT3600 Run time 5.49 sec)
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