HT Instruments XL421 Manual De Instrucciones página 28

6.2 USING THE INSTRUMENT IN A THREE PHASE SYSTEM
The measurement category is CAT III 1000V∼ to ground or CAT IV 600V∼ to
ground. Do not attempt to take any voltage measurements exceeding the
limits indicated in this manual. Exceeding the limits could cause electrical
shock or damage to the instrument.
Fig. 3: Instrument's connection in Three Phase system
If possible de-energize the plant under test before connecting the instrument.
Take all the safety precautions before taking actions on the plant.
1. De-energize the plant under test before connecting the instrument.
2. Open the flexible heads by pressing on expected points (see Fig. 1).
3. Clamp the cables under measurement with the heads and close it.
4. To increase the reading accuracy the clamped cable must be in the middle of the head.
5. Re-energize the plant under test.
6. How to start a Recording:
• If no recording was performed or if the recording data was already downloaded to a
PC, pressing and keeping the START/STOP key for 3 seconds. The STATUS LED
will be lighting for the same time, than will be stable lighting for 1 second and the
instrument will start the recording
• If the recording data was not already downloaded to a PC but the operator wants
to overwrite these data, pressing and keeping the START/STOP key for 6
seconds. The STATUS LED will be quickly blinking during the key pressing for the
same time, than the LED will be stable lighting for 1 second and the instrument will
start the recording. The old recording will be deleted and overwritten by the new
one. The instrument will wait for the next minute beginning (second=00) and the
STATUS LED is double blinking. After that the recording starts and the STATUS
LED blinks every 3 seconds. The instrument is storing the data.
CAUTION
CAUTION
EN - 9
XL421 - XL422