ISA T 2000 - Page 60

DOC. MIE11110 Rev. 5
Page
60
of
110
- N. 1 Cable for low voltage measurement connection, shielded, 4
m long, terminated on one side with the measurement connector,
and on the other side with two 4 mm banana plugs.
- N. 2 Clamps.
C) Input connection, voltage more than 10 V:
- N. 2 measurement cables.
- N. 2 Clamps.
HV cables shall be connected while T 2000 is powered-off. HV
clamps shall have a minimum clearance of 20 mm with respect to
all conductive surfaces, so to avoid discharges during operation.
After connections, the area around the HV clamps shall be
isolated, so that no accidental contact can occur. If something
goes wrong for any reason, power-off T 2000 before getting close
to HV connections.
BEFORE TEST START, MAKE SURE THAT YOU CONNECTED T
2000 HV OUTPUT TO THE PRIMARY AND NOT TO THE
SECONDARY SIDE. IN CASE OF ERROR, YOU WOULD GENERATE
A DESTROYING VOLTAGE AT THE VT PRIMARY!
As the test is to be performed on the 3000 V range, press test
START button (56): the following message will be displayed.
The HV is generated only while the START button (56) is kept
pressed: this is an additional safety feature. The operator will
have both hands occupied: one for the knob (6), the other for the
button (56); however, this is much safer than starting the HV
generation, and then forgetting it in the ON state.
You have to turn ON the HV key (28), and adjust the VSEC
voltage to the nominal voltage, if it is less then 3000 V, or at 2000
V, by the adjustment knob (6); the screen shows:
. The applied primary voltage;
. The measured secondary voltage;
. The transformer ratio;
. The percentage ratio error with respect to the nominal;
. The polarity, as OK or KO. You will notice that the % error does
not change as a function of the test voltage.