High Energy Power Cement Wire Wound Resistor

Cement resistor yzpst-rx27-1-7w- 6k8-j  the standard style book of cement resistor performance of the high energy power cement wire wound resistor: description performance requirements test method resistance temperature coefficient  t.c.r. ≤350ppm/℃  test temperature +20℃/-55℃/+20℃/+125℃/+20℃ short-time overload   r≤±(1%r±0.05r) no visible damage,markings legible 2.5 times rated voltage or maximum overload voltage (the lower) 5 seconds wiith standing voltage  no flasheover or breakdown ac 700v         1 minute terminal strength pulled r≤±(1%r+0.05r) no visible damage φd  0.68mm;load 20n  10s winded   φd  0.68mm;load 20n   900 twisted 3600  in opposite direction resistance to vibration r≤±(1%+0.05r) no visible damage 3 direction 2 hours each solder-heat resistance r≤±(1%r+0.05r) marks legible ,no visible damage 350℃ 2mm from the body,3 seconds solderability at least 95% of the dipping surface must be covered by new solder, no flaws gathered. 235℃  2mm from the body, 2 seconds temperature cycle r≤±(1%r+0.05r) no visible damage -25/+155℃  for 5 cycles humidity r≤±(5%r+0.05r) no visible damage 40℃  95%rh   1344 hours 70℃ load life r≤±(5%r+0.1r) no visible damage, marks legible rated voltage or maximum voltage,1.5 hours on, 0.5 hours off