Micro-Ohmmeter Model 6250
35
• Residual voltage (V
0
) measurement across the resistor terminals
is measured.
• The measurement current (I) is established, the voltage across
the resistor terminals (V
1
) is measured and the measurement
resistance result R = (V
1
- V
0
) / I is displayed.
• To start a new measurement cycle, Release at least one
probe, and then reconnect it to the next point or specimen.
NOTE: If the range is exceeded, the unit displays “Err 07”. Changing the
range switch position will stop the test cycle and the unit returns to the
Stand-by state. Each measurement taken during the test cycle can be
temperature compensated and stored while the test cycle is running.
• Store the measurement of each specimen or point by rst pressing
the MEM button, then select the object and test location to store
the measurement using the arrow buttons. When the desired loca-
tion has been selected, press the MEM button a second time to
complete the data storage process.
• The test is stopped by pressing the START/STOP button.
4.6 Ambient Temperature Compensation
Principle
The metals used in the windings of certain devices (for example, the copper
wire used in transformer or motor windings) have high temperature coef-
cients in the order of 0.4%/°C (for copper or aluminum). This results in
resistance measurements that are highly dependent on the temperature of
the device. Activating temperature compensation will correct for this condi-
tion.
The “Temperature Compensation” function can be accessed by pressing
the button before the start of a test in Resistance and Inductive resis-
tance measurement mode. It can also be activated at anytime during Auto
measurement mode.
Its purpose is to compensate the measured or resistance value at the
ambient temperature (whether measured or programmed), to the resis-
tance value that it should have at a reference temperature.
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