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154 <h3>LED and oscilloscope test</h3>
156 This test measures latency in relation to the device's LED indicator.
157 If your production device does not have an LED, you can install the
158 LED on a prototype form factor device. For even better accuracy
160 oscilloscope probe to the LED directly to bypass the light
165 If you cannot install an LED on either your production or prototype device,
181 <li>Run an app that periodically pulses the LED at
190 <li>Place a light sensor next to the LED.</li>
199 assuming that the LED latency and light sensor latency are both zero.
200 Typically, the LED and light sensor each have a relatively low latency
234 using the LED and oscilloscope method and then use
