The WBK40 attaches to any of the three parallel expansion ports on the WaveBook or StrainBook, and provides 14 thermocouple input channels. Because the WBK40 has a built-in 16-bit, 200 kHz A/D converter, thermocouple measurements on the WBK40 do not consume valuable ­sampling time from the 1 MHz A/D converter. As a result, there are no speed implications to WaveBook, StrainBook, or other WBK ­measurements when the WBK40 is attached.