Omicron CMC 356, Reference Manual

Page: 63 / 114

Technical Data
63
6.4.2 Counter Inputs 100 kHz (Low Level)
The SELV interface connector "ext. Interf." holds two high frequency counter
inputs for up to 100 kHz are available for the testing of energy meters.
In addition, four transistor binary outputs (Bin. out 11 - 14) are available.
They are described in section 6.3.6, "Low-Level Binary Outputs ("ext.
Interf.")" on page 56.
Figure 6-15:
Pin assignment of "ext.
Interf." (upper 16-pole
Lemo socket); view onto
the connector from the
cable wiring side
Table 6-19:
Counter inputs 100 kHz
Pin Function
Pin 1 Counter input 1
Pin 2 Counter input 2
Pin 3 Reserved
Pin 4 Neutral (N) connected to GND
Pin 5 Binary output 11
Pin 6 Binary output 12
Pin 7 Binary output 13
Pin 8 Binary output 14
Pin 9 Reserved
Housing Screen connection
2 Counter Inputs
Max. counter frequency 100 kHz
Pulse width > 3 µs (high and low signal)
Switch threshold
pos. edge
neg. edge max. 8 V
min. 4 V
Hysteresis typ. 2 V
Rise & fall times < 1 ms
Max. input voltage ± 30 V
Connection Socket "ext. Interf." (rear CMC 356 )
Insulation Reinforced insulation to all other potential
groups of the test equipment. GND is
connected to protective earth (PE).