A modular printhead assembly is provided for an inkjet printer. The first multiplexer selects a data signal or a scan-in signal as a first element output signal according to a scan enable signal. When the control element 14 is moved to a position corresponding to the deployed position of the latching element 12, the latching element 12 is resiliently displaceable towards the vehicle body 2, to allow the suspension arm 6 to rise, for example when the wheel 4 is driven over an obstacle. After this data set has been established, the test golfer takes a golf swing with a golf club, while performance parameters for the swing are measured. A compliant member comprises a polymeric material and may be positioned within the region between the at least one contact portion and either the peripheral region of the substrate or the cover. The method also includes generating secondary pump control information for the secondary amplifier based on the primary pump power information and amplifying a first optical signal at the secondary amplifier based on the secondary pump control information.