Micro-Ohmmeter Model 6250
33
4.5.3 Resistance Measurement Mode ( )
This mode is intended for measuring contact and metal plating resistance
levels, and as a general rule, any resistance level on material with a time
constant that is less than a few milliseconds.
In this mode, only one measurement is performed per cycle. When the
START/STOP button is pressed, the test current is applied for approximately
400 milliseconds. Residual voltage is measured, a resistance measurement
is taken and the test stops automatically.
The advantages of the resistance mode include:
• Reduced power consumption as the test current is o between
measurements.
• Less heating of the measured resistance.
• Improved compensation of stray voltages as these are measured
and compensated before each resistance measurement.
Press the button until the icon shows on the display.
From the Stand-by state, start a test by performing the following:
• Connect the Kelvin probes to the test specimen.
• Press the START/STOP button.
•
If the Kelvin probes are incorrectly connected, the display will
show error message “Err 11” (current leads incorrectly connected),
or “Err 12” (voltage leads incorrectly connected). The unit will then
return to the Stand-by state. When the error is corrected, the test
can begin again by pressing the START/STOP button.
• With the current switched o, the residual voltage (V
0
) across the
resistor terminals is measured. If this voltage level is too high,
the unit displays “Err 13” and returns to Stand-by position. (See
Chapter 7 - “Troubleshooting” for all error message descriptions.)
• The current (I) is switched on when the START/STOP button is
pressed.
• The voltage across the resistor terminals (V
1
) is measured and
then the current is removed.
• The measurement resistance result R = (V
1
- V
0
) / I is displayed
or error message “Err 07” is displayed, if an over range condition
occurs.
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