Autozero Unit
Autozero unit subtracts dc component of input signal, so output contains only ac component. Unit installed in instrumentation system between signal source and data-acquisition equipment.
White, William C.↗
Engineering topics
White, William C.
Publications and source records attributed to White, William C..
Monitoring dynamic loads on wind tunnel force balances
Two devices have been developed at NASA Langley to monitor the dynamic loads incurred during wind-tunnel testing. The Balance Dynamic Display Unit (BDDU), displays and monitors the combined static and dynamic forces and moments in the orthogonal axes. The Balance Critical Point Analyzer scales and sums each normalized signal from the BDDU to obtain combined dynamic and static signals that represent the dynamic loads at predefined high-stress points. The display of each instrument is a multiplex of six analog signals in a way that each channel is displayed sequentially as one-sixth of the horizontal axis on a single oscilloscope trace. Thus this display format permits the operator to quickly and easily monitor the combined static and dynamic level of up to six channels at the same time.
Ferris, Alice T.↗
Force-Balance Dynamic Display
Balance dynamic display unit (BDDU) is compact system conditioning six dynamic analog signals so they are monitored simultaneously in real time on single-trace oscilloscope. Typical BDDU oscilloscope display in scan mode shows each channel occupying one-sixth of total trace. System features two display modes usable with conventional, single-channel oscilloscope: multiplexed six-channel "bar-graph" format and single-channel display. Two-stage visual and audible limit alarm provided for each channel.
Ferris, Alice T.↗
Analog Sensor Of Large-Amplitude Displacements
Noninvasive device measures large amplitudes at low frequencies. Low-angle, light-sensitive system tracks moving leading edge of model. Applications include opening and closing of automatic doors as far and fast as needed.
Miserentino, Robert↗