When scanning in one position for longer time period a slight movement can occur in the scanner position due to changes in temperature.
Am I missing a comma in this sentence?
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A comma is not necessary. But as @queeg pointed out, an a before longer would be expected; either that or make period plural. Also, watch out for those people who insist due to is "substandard" here and should be replaced by because of.– user6951Oct 3, 2014 at 13:32
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1 Answer
Yes, you are missing a comma after period.
When is a conjunction in the sentence. If the when-clause comes before the main clause, we use a comma.
"When scanning in a position for a longer time period, a slight movement......".
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2You also, most probably, need to place an additional 'a' after 'for' but before 'longer'. 'one position for a longer time period, a slight' etc.– queegOct 3, 2014 at 9:13
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A comma is not necessary, but some might find one useful.– user6951Oct 3, 2014 at 13:34