Acoustic holography has been successfully applied for accurate characterization of ultrasound sources. However, its direct use for multi-element phased arrays with many possible field configurations is not feasible. Here, two methods based on transient acoustic holography are proposed allowing reconstruction of all field configurations over a range of frequencies. The methods were tested using a 2 MHz piezocomposite 12-element annular array. First, the holography measurement was performed with all array elements excited in phase. After field reconstruction on the array surface, each element was separated spatially. Second, the array elements were excited individually in sequence for each measurement location. After separating the measured signals in time, 12 separate holograms were obtained to representing each array element individually. For both methods, the array performance was predicted by numerically defining the phase of each element. To evaluate these predictions, a hologram for a specific case of focus steering toward the array was measured independently. Although both characterization methods captured the array performance with focus steering, the approach that extracts elements from time sequences provided higher accuracy and thus can be used for sources with stronger electrical and mechanical crosstalk between the elements. [Work supported by RSF-20-12-00145 and NIH R01EB025187.]