un segundo/un momento
I was just watching an episode of CSI (originally in English but dubbed in Spanish) and one of the characters said "un segundo, por favor" to mean "one second please."
I have often heard the phrase "(espera) un momento, por favor" used this way and in English the similar phrases "just a minute" and "just a second," but I can't remember having heard these latter of these two used in Spanish before.
I was just wondering if this would be said like this in Spanish (i.e. un segundo) or if it was just poorly translated (literal translation) into Spanish.