Caution should be exercised when connecting and disconnecting cells.
Handling of wires and connectors should be minimized to keep thermal EMFs as
low as possible.
When observations begin, there should not be extended
delays in completing the total observation series.
Observations must be
made in the order specified by the numbers under the observation blocks on
the observation sheet. This conserves the trend-eliminating feature of the
The equipment is connected as shown in Figure 3-5 and measure the
difference between cell 1 of the transport standard and cell A of the lab
standard is measured. The observed value, with proper sign, is entered in
observation block number 1 (this is the value of cell 1 - (minus) cell A).