ESTOP TEST Response Time Test
Equipment Used
E-STOP
Tektronix TDS 2912C Oscilloscope
NI CDAQ-9172 Chassis, NI 9215 Analog Input Module, NI 9263 Analog Output Module
Hot Wheelz GUI
Procedure:
1. Attach the channel 1 probe of the oscilloscope to the positive terminal of the E-STOP
2. Attach the channel 2 probe of the oscilloscope to the positive terminal of the Analog Output
3. Adjust the oscilloscope to capture channel 1 on the rising edge.
4. Open the Hot Wheelz GUI and ensure that the E-STOP status is good
5. Set the GUI to manual mode, hit start and set the throttle position to 100%
6. Press the E-STOP down to cause a fault
7. Capture should be displayed on oscilloscope, save to USB. Repeat steps 4 through 6 five times
8. Analyze spacing between edges of channel 1 and 2 traces.
Results:
Trial #
Response time (ms)
1
206
2
171
3
262
4
258
5
296
Table 1: Response Time E-Stop
Average = 238ms
Figure 1: Trial 1 Capture
Figure 2: Trial 2 Capture
Figure 3: Trial 3 Capture
Figure 4: Trial 4 Capture
Figure 5: Trial 5 Capture
Conclusions:
The E-Stop stop functions as expected. The triggering of the E-Stop is able to be detected within reasonable time to
ensure safety.
Equipment:
Figure 6: Tektronix TDS 2912C Oscilloscope
Figure 7: NI CDAQ-9172 Chassis, NI 9215 Analog Input Module, NI 9263 Analog Output Module
Figure 8: E-STOP
Figure 9: Hot Wheelz GUI