Seaward DO7010 - Manual (Page 30)

Putting in contact 2 metals from different material generates unwanted voltages
(EMF) proportional to the ambient temperature.
Two methods exist to cancel this problem: the Zero method and the Average method.
The ZERO method:
Φ Select the ZERO line
– ON = Zero method operating
– OFF = Zero method not operating
Φ Enter the selection with the Enter key.
The AVERAGE method:
Φ Select the AVERAGE line
Φ Press on the RIGHT arrow or on the enter key.
measurements to get the resistance calculation. Select with the UP and DOWN
arrows:
– ON = Average method operating
– OFF = Average method not operating
Φ Enter the selection with the Enter key.
RANGE OFF
CURRENT ON
ZERO
AVERAGE >
LOG
LIMITS
ESC
RANGE OFF
CURRENT ON
ZERO >
AVERAGE
LOG
LIMITS
ESC
When measuring low resistances, consequently low voltages, the accessories and
4-1-3 Thermal EMF Error:
Both methods are available with the DO7010.
Φ The Zero method consists of a voltage measurement without current, then a
Φ The Average method consists of a voltage measurement with a positive
resistance calculation. Select with the UP and DOWN arrows:
Φ Press on the RIGHT arrow or on the enter key.
voltage measurement with current, and subtraction of EMF voltages before
current, then a voltage measurement with negative current, and average of the 2
specimen under test conductive metals can introduce significant errors.
Operating Instructions Digital Microhmmeter Type DO7010
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