There are two frequency output options available:
• The Turbine Meter Simulation option is used when a receiving instrument is capable of interfacing directly with a
turbine transmitter’s magnetic pickup. The output is a relatively low voltage AC signal whose amplitude swings above and
below the signal ground reference. The minimum AC amplitude is approximately 500 mV peak-to-peak. To activate the
turbine output circuit, turn SW4 OFF.
0
500 mV
p-p
Figure 30: Frequency output waveform (simulated turbine)
• The Square-Wave Frequency option is used when a receiving instrument requires that the pulse voltage level be either
of a higher potential and/or referenced to DC ground. The output is a square-wave with a peak voltage equaling the
instrument supply voltage when the SW3 is ON. If desired, an external pullup resistor and power source can be used by
leaving SW3 OFF. Set SW4 to ON for a square-wave output.
0
+V
Figure 31: Frequency output waveform (square wave)
Totalizer Output Option (Energy Model)
Energy models can be ordered with a totalizer pulse output option. This option is installed in the position where the Ethernet
option would normally be installed.
Optional Totalizing Pulse Specifications
Parameter Specication
Signal One pulse for each increment of the totalizer’s least significant digit
Type Opto-isolated, open collector transistor
Pulse Width 30 mSec, maximum pulse rate 16 Hz
Voltage 28V DC maximum
Current 100 mA maximum (current sink)
Pullup Resistor 2.8 …10 k Ohms
Table 6: Optional energy usage totalizing pulse output
OTE:N The totalizer pulse output option and the Ethernet communications output cannot be installed in the same Energy
model at the same time.
Inputs/Outputs
Page 29 May 2016 TTM-UM-00136-EN-06
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