CS 2099 Eurocheck
Eurocheck operation
18
Step
Action
1
q
Connect tested instrument into Eurocheck insulation resistance test
sockets using universal test cable, follow connection diagram shown in
Figure 4.3.
2
q
Switch on the tested instrument and select insulation resistance function.
q
Set the first measuring voltage.
3
q
It is not necessary to power on Eurocheck when performing insulation
resistance calibration.
q
Observe any warnings displayed on the tested instrument. If any is
present, remove the causes before proceeding.
4
q
Perform insulation measurement with the tested instrument.
q
Write down measurement result for documentation purposes.
5
q
If measured insulation resistance deviates significantly from reference
value, it is very likely the tested instrument is damaged. Send it to your
distributor or manufacturer for repair and/or readjustment.
6
q
Repeat steps 4 and 5 with the other reference insulation resistance
value.
7
q
Set another insulation measuring voltage and repeat steps 4 – 6.
q
Make sure to select all available measuring voltages.
Notes:
q
Some instruments (like MI 3101 – EurotestAT) support measurement of all three
insulations in standard mains cable (between L and N, L and PE, N and PE). In
such case it is necessary to calibrate each insulation measurement separately.
q
It is advisable to perform at least three consecutive measurements to verify
stability of results. If the tested instrument supports continuous insulation
measurement it is advisable to test this functionality as well (function is usually
engaged by pressing and holding TEST button).
4.11 Low
Ω
and continuity resistance calibration
Eurocheck offers 3 low resistance values for calibration: 0.5
Ω
, 5
Ω
and 15
Ω
. It is
always possible (and recommended) to add fourth value into your calibration procedure
–
0
Ω
(short-circuited test leads).
Metrel installation test instruments usually offer 2 distinctive functions for measuring low
resistances. Low
Ω
usually stands for measuring low resistances with 200 mA test
current, often with automatic polarity reversal. Continuity denotes a function with lower
measuring current, usually around 7 mA. Both functions can be calibrated with
Eurocheck.
Low resistance measurement calibration can be performed with universal test cable or
tip commander. Make sure to follow connection instructions for the tested instrument
(determine the leads of the test cable which are used for this measurement). Generic
connection diagram is shown in Figure 4.4.