DIGIOHMpro
- 9 -
3.3.2. Function R
The “R“ function is for continuity (low resistance) measurement.
Measurement:
•
Check that there is no external voltage applied on measured resistance (see
chapter 3.3.1. - function U).
•
Press and release the
U/R/●›
key to select R function. Measured resistance
value is displayed or "---- Ω" is displayed if measured value is > 200Ω.
•
Resistance measurement is blocked in the following cases:
•
external voltage is applied on test tips
•
external voltage is on the measured resistor (caused by flowing of an
external current through the measured resistor)
•
the voltage induced in the measuring wires, which are unconnected
This is indicated by 5x beeps; the symbol "Uin" is displayed, too. The instrument
remains in voltage measurement function U. To switch it to R function is possible
after disconnecting the voltage from the test tips.
If an external voltage appears on measure resistance during measurement, this
state is indicated by the "Uin" message on display and by continuous beeping.
Test lead resistance compensation (calibration)
It is recommended to carry out test lead compensation before measurement.
After test lead resistance compensation is carried out, it is automatically
subtracted from all resistance measurements and thus only actual value of
measured resistance is displayed.
•
Short the test tips. After displayed value is stabilized, press and release the
CAL/ELEC
key. It is signalized by yellow "Cal" message.
If the resistance value during measurement is greater than or equal to
compensation value, the message "Cal" remain lit (not blinking).
If the resistance value during measurement is lower than compensation
value, the word "Cal" is blinking and it is necessary to repeat the test leads
resistance compensation.
•
The compensation value is permanently stored until a new compensation or
cancellation of compensation is carried out. Carry out new compensation
always after connecting new test wires, crocodile clips, test tips etc. to the
instrument. It is not necessary to carry out new compensation after switching
off the instrument or after removing and reinserting the batteries.
Cancellation of test lead resistance compensation
Press and release the
CAL/ELEC
key when test tips are either open or
connected to resistance greater then 4 Ω. Compensation is cancelled. It is
signalized by blue "X CAL" message.
