UL工程师初次来实验室
UL工程师初次来第三方认证实验室目击时，需要对仪器校准吗？特别是对电源校准。是不是要测试电源的压降，具体怎样操作？ 这么说，你们有申请WTDP吗？ 1.对电源系统的审核:包括谐波失真,电压变动率,短路电流测试，断路器是否是UL Listed 产品等等.
2.仪器校准;
包括校准证书上的CNAS标志,误差率是否在UL规定的范围内.，热电偶是否有校准．
还有的,暂时不记得了,明天查了再说. TUV,UL在做第一次目击前,都会有一个实验室WTDP资格审核的.
审核可以与测试可以同时进行 刚好前段时间做过UL审核，见附件。具体操作就是在三个电压情况下带载与不带载的情况下测压降，谐波失真，一般都没多大问题，就是要准备好阻性负载（热得快，灯泡都可以）。 忘放附件了。
怎么放不上附件啊？ 因为用的是快速发贴,所以没那个功能
用下修改功能,里面有提示加附件 我选了啊，但是也弄不上去。
00-0P-C0036
LABORATORY – POWER QUALITY - FOR DAP CLIENTS
Approval and Revision History Table:
REVISION 2.0 DETAIL
Modified Appendix A to indicate power quality measurements are to be made on 120V 60Hz, 240V 60Hz and 230V 50Hz test power prior to any testing and align criteria with CTL-OP-0110.
Clarified circuits with larger power capacity are to be monitored during tests, or verified annually to confirm requirements with the test standard.
Clarified higher power circuits are to be validated when deemed necessary by UL when the test standard does not provide power quality requirements.
Clarified the “Frequency stability” test is performed when frequency converters provide test power.
Modified method for “Independence of Test Circuits” to state measurements are to be repeated with high demand loads turned off if it is suspected that these loads affect power quality in test circuits.
Corrected typo in “Results” from FOC max to Floaded max
Title: DAP Process Owner
(Document Owner)
Name: Jodine Hepner-2008/1/6 Title: Senior Staff Engineer
(Originator)
Name: Jeff Hall- Title: Global Chief Engineer NACPO
Name: William R. Carney-2007/12/26 Title: Director Global CAS Operations and Engineering
Approver
Name Raymond Burg-2007/12/18
Director Test & Laboratory Compliance
NameJeff Schutt-2007/12/19 Title
Name Title
Name Title
Name
Previous Approval & Revision History Tables are available on the Document Container. UL一般要求设备的计量周期是一年
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