TESTER
2550LCD
13
8. Phase testing
Bring one of the probe tips into contact with a conductor, while touching the finger contact located at the back.
When a phase of min. 100V~ is connected, the small LCD screen indicates “L1”. For the determination of phase
conductors by means of the accessible electrode, the perceptibility of the indication can be impaired, for example
by insulating devices for protection against direct contact, in unfavourable positions, for example on wooden step-
ladders or insulating floor coverings, as well as in unfavourable lighting conditions, such as in sunshine, and in a
non-operational, grounded A.C. voltage system..
9. Rotating field testing
Identify a phase conducting wire as described in point 6. Now connect two phase conductors to the probe tips and
touch the finger contact. If the phase connected to probe tip L2 follows the phase connected to probe tip L1, the
phase sequence is right-handed. The small display indicates “R”. If this is not the case, there is a left-handed field
and „L“ lights up . The voltage indicator should give a reading of approx. 400V. If “R” appears in the small LCD
screen and the only reading is 230V, only one phase conductor is connected.
10. Continuity / resistance testing
Bring the probe tips into contact with the conductor, fuse or resistance that is being tested. With resistances of 0-2
k
Ω
the resistance reading appears on the display. From 0…ca. 35
Ω
additionally an acoustic signal sounds. If the
reading is >2k
Ω
, the excess indicator “1” appears on the display.
11. Voltage test with RCD trip test
The tester 2550LCD is equipped with a switchable load, which permits the throughput testing of FI/RCD-safety
switches with triggering. The FI/RCD safety switch is triggered by max. 30mA (max. voltage 240V)
12. Backlighting
For operation in low-light conditions, the BL (backlight) sensor activates automatically to ensure that the screen can
be read even in total darkness.
13. Battery replacement:
To replace the batteries, release the screw under the main casing and pull the battery compartment cover
downward to remove. Observe the correct polarity when inserting the new batteries.
Note
: Batteries should not be disposed of as normal household waste. Take them to an approved collection point.
14. Technical Data
Display:
3½-digit LCD + 1-digit LCD, illuminated; 4 LEDs
Voltage range:
6...1000V AC/DC
Frequency range:
0...400Hz
Voltage for phase test:
> 100 V AC
Test current:
~30mA
Operation time:
ED (DT) 30s
Continuity test:
0...2k
Ω
0…35
Ω
buzzer
Resistance measurement:
0...2k
Ω
Automatic load (RCD):
yes
Type of protection:
IP65
Overvoltage class:
CAT IV 1000V
Safety complying:
IEC/EN 6643-3, DIN VDE 0682-401
Power supply:
2x 1,5V Typ AAA Micro