Megger TM1800, User Manual

Page: 59 / 104

CG0757JE ZP-CG01E TM1800 59
6 CABA LOCAL
2]
Select the appropriate transducer output
type by pressing the”Transducer type” but-
ton repeatedly. There are three different
transducer output types available:
„ „
"Resistive" transducer output is a voltage that is depending
on the position of the transducer.
„ „
"Digital" transducer outputs are pulses depending on the
position of the transducer.
„ „
"4 – 20 mA” transducer output is a current depending on
the position of the transducer.
Calibrating resistive transducers
The calibration can be done in three different ways:
A]
Manual. Enter all values (pairs of position &
voltage reading) manually.
B]
Using TM1800 readings as reference. Enter
position value manually while using automat-
ic TM1800 voltage reading.
C]
Using digital transducer as reference. Using
automatic position reading from a digital
transducer and automatic voltage reading
from TM1800.
Note
The system assumes that you use a voltage
reference of 4095 mV applied across the
transducer to be calibrated. If you connect
any other reference you have to multiply each
voltage reading with 4095 / (applied ref. volt
(mV)).
A. Manually calibrating a resistive
transducer
1]
Press the “Calibrate” button. The following
question appears.
2]
Press the “NO” button. The following screen
appears.
3]
Enter the calibration values in the fields
shown above the graphic. For quick naviga-
tion between the fields use the arrow but-
tons next to it.
4]
Type in a significant name for the transducer
into the “Transducer ID” field.
5]
Press the “Finish Calibration” button.
The evaluation starts and you will se the
result. If you get the “Calibration failure”
message you must recalibrate.