FRF - Display Data This screen shows the FRF measurement data. The upper trace shows the magnitude. Colour indicates the coherence of the measurement: frequencies with good coherence (≥85%) are shown in green and frequencies with poor coherence (<85%) in red. The lower trace shows the phase. During acquisition with Accept/Reject set to Manual the two traces show the Hammer and Response time traces. * HELP - help menu * VIEW - allows the user to change the view on screen depending on what the set-up is * SAVE - stores the collected data * RETAKE - discards data collected to date and retakes the Transfer Function measurement. * BACK - returns to Setup menu. * LEFT / RIGHT cursor keys move the cursor on the magnitude / phase traces. * +- key expand / contracts the trace X-axes.