16
Continuity Measurement
Continuity measurement measures a low resistance (< 10 or 100 Ω depending on the current)
at a high current (200 or 20 mA)
Note: A current of 20 mA reduces the power consumption of the instrument, increasing
its battery life. However, standard IEC 61558 requires 200 mA current for continuity testing.
If an external voltage
>
15V is detected in the system under test during the continuity
measurement, the instrument is protected without a fuse. The continuity measurement is
stopped and the instrument reports an error until the voltage disappears.
Lead Compensation
Before checking continuity, you should compensate for the resistance of the measurement
leads. This ensures that the resistance measurement excludes the resistance in the leads.
To do this, set the rotary switch to Ω. Then short-circuit the measurement leads and
press the button for >2 seconds.
The display changes to zero and the symbol is displayed. The resistance of the leads will be
systematically subtracted from all continuity measurements. If the resistance of the leads is >10Ω,
there is no compensation. The compensation remains in memory until the instrument is turned OFF.
If the leads are changed with no change of compensation, the display may become negative. The
instrument reports that the compensation must be redone by displaying a blinking symbol.
To remove the compensation of the leads, leave the leads open and press the button for >2
seconds. The LCD displays the resistance of the leads and the symbol goes off.
0
0
M
mA
