Table 1-4. Ring Specimen Indications

TM-1-1500-335-23 Nondestructive Inspection Methods Manual
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T.O. 33B-1-1 Figure 1-9. Ketos Ring Table 1-4. Ring Specimen Indications Type of D.C. Minimum No. of Suspension Amperage Holes Indicated 1400 3 Non-f luorescent 2500 5 3400 6 1400 4 Dry Powder 2500 6 3400 7 1400 3 Fluorescent 2500 5 3400 6 A.C. Amperage Non-f luorescent 1000 1 Dry Powder 1000 1 Fluorescent 1000 1 1.6.10.2 QQIs. Test specimen(s) used with QQIs offer a more versatile means of checking system performance than afforded by the Ketos ring. The specimens can be real parts or designed to be representative of the most challenging inspection to be currently performed. This combination is capable of providing an adequate check on any magnetic particle inspection system. Even though QQIs respond to the applied, not residual, field, demagnetization is necessary of the specimen(s) in order to remove the previously applied inspection media. 1.6.10.3 Cracked Parts. The ultimate specimens for the performance tests are cracked parts. If available, they require careful handling to remain corrosion-free and retain their f law sizes. 1.6.11 Ammeter Check. Amperage indicator accuracy check SHALL be performed using the calibrated ammeter/shunt authorized in TA-455. Operation of the ammeter/shunt SHALL be according to the commercial manufacturer’s operating instruction. DC amperage variations exceeding 10% at reading or +60 amperes, whichever is greater, and Change 2 1-49

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