1. Make a proper ice bath. Set the temperature baths for 37.5 40.0C and 50.0 80.0C. Set the temperature block for 112.5C. Having exactly the right temperature is not necessary.
Turn Wavetek power switch on. When the power is first switched on, the 475 can either be in indicator mode or calibrator mode ... we want to start this part of the lab with the indication mode set to show ohms input ... easy place to start ... following the operation guide for indicator mode on page 2-13 to 2-15 of the manual, set up the calibrator with the correct key strokes so that ohms can be measured by the 475.
Note, step four of the operation guide is critical ... this step explains how to ensure that the 475 is in indicator mode ... please read carefully! Note, step one of the operation guide is also critical ... this step explains how set up the 475 to indicate resistance from a 2-wire, 3-wire or 4-wire RTD … for our first measurement, set the switch for 2-wire RTD.
We will use the QuadTech decade box to generate some resistance signals to measure with the 475. Make connections between the decade box and the 475 as follows: