This information relates to connecting a Hand Dynamometer (HD-BTA) to an NI-ELVIS interface. In some situations, the signal may be noisy. To fix this, simply place a resistor in series with the output signal of the sensor. The resistor can be somewhere in the range of 5k ohm to 7k ohm. 

If you are using the Vernier Hand Dynamometer with NI-ELVIS, you might be interested in this sample code and bioinstrumentation courseware, as well as this webcast from National Instruments.