The best way to do this is to take many samples of the whole stream over a period, instead of taking a portion of the stream for the whole time.p.6 In the case where the material is in a heap, scoop or thief sampling needs to be done, which is inaccurate: the sample should ideally have been taken while the powder was flowing towards the heap.p.10 After sampling, the sample volume typically needs to be reduced.
Ang pinakamahusay na paraan upang gawin ito ay upang gumawa ng maraming sample ng buong stream sa paglipas ng panahon, sa halip ng pagkuha ng isang bahagi ng stream para sa buong time.p.6 Sa kaso kung saan ang materyal ay nasa isang kimpal, scoop o magnanakaw sampling kailangang ma-tapos na, na kung saan ay hindi tumpak: Dapat may perpektong ay tinanggal ang sample habang ang pulbos ay dumadaloy patungo sa heap.p.10 Pagkatapos ng pagsa-sample, karaniwang kailangang maaaring mabawasan ang dami ng sample.