Follow the instructions to verify the reverse polarity protection feature of the device:

1. Set up the oscilloscope as listed in Table 4-11.
   Table 4-11 TPS2640EVM Reverse Polarity Test

   Oscilloscope Setting	CH1 Probe Points	CH2 Probe Points
   Channel 1 = 10 V / div	VOUT1 (TP3)	VOUT2 (TP12)
   Channel 2 = 10 V / div	VIN1 (TP2)	VIN2 (TP11)
   Trigger source = Channel 1
   Trigger level = –12 V ±1 V
   Trigger polarity = Falling
   Trigger mode = Single
   Time base	10 ms / div

2. Set the power supply voltage to 42 V and disable the power supply.
3. Connect +ve terminal of the power supply to either T1/T3 –ve terminal, connect –ve terminal of the power supply to either T1/T3 +ve terminal.
4. Enable the power supply and verify the reverse polarity protection waveform as shown in Figure 4-8.
   Figure 4-8 Reverse Polarity Protection.