Measuring Times; Pulse Output Leds - Landis+Gyr E350 Series User Manual

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7.1.2

Measuring Times

ZMF
U =230 V
n
ZFF
U =230 V
n
7.1.3

Pulse Output LEDs

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For technical reasons higher measuring deviations can occur during short-
term measurements. It is therefore recommended to use sufficiently long
measuring times in order to achieve the required accuracy.
Table of required measuring times:
Measuring uncertainty
3 P
Current
cos=1
A
25 s
0.2
20 s
0.5
20 s
≥ 1
3 P = universal
1 P = single-phase
Measuring uncertainty
3 P
Current
cos=1
A
42 s
0.2
20 s
0.5
20 s
1
20 s
≥ 2
For meters with firmware version M25:
If the so called register test (test of the meter constant or the gear
transmission error) is carried out not at a constant load point, but with a
constant injected amount of energy, a test time of 15 min is recommended
(minimum 10 min).
The pulse output LEDs are positioned on the faceplate.
LED for active energy: It supplies pulses with a value of 1 Wh of the import
or export energy measured. This corresponds to a meter constant of 1000
imp/kWh. For meter testing purposes, only the rising edge is decisive.
LED for reactive energy: The LED for reactive energy works similarly, but
with values of 1 varh and a meter constant of 1000 imp/kvarh.
0.2%
1 P 3 P
1 0.5
70 s 90 s
20 s 20 s
20 s 20 s
0.2%
1 P 3 P
1 0.5
3 min 3 min
30 s 27 s
20 s 20 s
20 s 20 s
D000027979 en t – E350 Series 2, 3-Phase ZxF100Ax/Cx – User Manual
Maintenance
Measuring uncertainty
0.1%
3 P 1 P
1
cos=1
90 s 4.5 min
20 s 45 s
20 s 20 s
Measuring uncertainty
0.1%
3 P 1 P
1
cos=1
3 min 12 min
30 s 2 min
20 s 30 s
20 s 20 s
- -
3 P
0.5
6 min
60 s
20 s
3 P
0.5
11 min
2 min
30 s
20 s
-