        WAVEDESC['TIMEBASE'] = {0: '1_ps/div',1: '2_ps/div',2: '5_ps/div',3: '10_ps/div',4: '20_ps/div',5: '50_ps/div',6: '100_ps/div',7: '200_ps/div',8: '500_ps/div',9: '1_ns/div',10: '2_ns/div',11: '5_ns/div',12: '10_ns/div',13: '20_ns/div',14: '50_ns/div',15: '100_ns/div',16: '200_ns/div',17: '500_ns/div',18: '1_us/div',19: '2_us/div',20: '5_us/div',21: '10_us/div',22: '20_us/div',23: '50_us/div',24: '100_us/div',25: '200_us/div',26: '500_us/div',27: '1_ms/div',28: '2_ms/div',29: '5_ms/div',30: '10_ms/div',31: '20_ms/div',32: '50_ms/div',33: '100_ms/div',34: '200_ms/div',35: '500_ms/div',36: '1_s/div',37: '2_s/div',38: '5_s/div',39: '10_s/div',40: '20_s/div',41: '50_s/div',42: '100_s/div',43: '200_s/div',44: '500_s/div',45: '1_ks/div',46: '2_ks/div',47: '5_ks/div',100: 'EXTERNAL'}[unpack(""<H"", wave[324:326])[0]]