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Maintenance
ZMD400xT
ZFD400xT
U
= 58 to 230 V
n
I
= 1 A, 5 A
n
7.1.3
Optical Test Output
D000030110 d – E650 Series 3 (ZMD400AT/CT, ZFD400AT/CT) – User Manual
Table of measuring times required at the optical test output:
Measuring uncertainty
Current
3 P
% I
cosj=1
n
1
40 s
2
20 s
5
10 s
10
8 s
20
6 s
50
6 s
100
6 s
200
6 s
3 P = universal
1 P = single-phase
The red optical test outputs on the meter above the LCD should be used for
meter testing. These supply pulses at a frequency dependent on the meter
constant R, whereby the rising edge is always decisive for the test.
Note that the digital signal processing provides a delay of 2 seconds be-
tween the instantaneous power at the meter and the appearance of the
pulses at the optical test outputs. No pulses are lost.
The number of pulses per second for the desired power is obtained by
multiplying the meter constant R by the power in kW divided by 3600.
Example:
Meter constant R = 1000
Power P = 35 kW
f-test output = R x P / 3600 = 1000 x 35 / 3600 = 10 imp/s
0.1%
1 P
3 P
1
0.5
cosj=1
40 s
90 s
20 s
40 s
10 s
15 s
8 s
10 s
6 s
8 s
6 s
6 s
6 s
6 s
6 s
6 s
Measuring uncertainty
0.05%
3 P
1 P
1
80 s
80 s
160 s
40 s
40 s
16 s
16 s
14 s
14 s
12 s
12 s
12 s
12 s
12 s
12 s
12 s
12 s
© Landis+Gyr AG
85/93
3 P
0.5
80 s
32 s
18 s
14 s
12 s
12 s
12 s
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