Testing, Troubleshooting, and Maintenance
CENTRON® Meter Technical Reference Guide 69
Figure 35: Pulse Detector
Annunciators
Watthour Annunciators
The CENTRON meters equipped with LCDs, the watt disk emulator shows the direction of
energy flow. The emulator will scroll left to right for positive (line to load) energy flow, and
right to left for negative energy flow.
The C1S and C1SR are equipped with LCD displays that utilize a three square segment
annunciator to show the direction of energy flow. The annunciator represents 1.0 watthour
each time it turns on and 1.0 watthour each time it turns off. Once all three segments have
turned on/off, the watt disk emulator produces a Kh of 6.0.
The C12.19 C1SD/T/L meters utilize a watt disk annunciator in which the Kh value of the
single segments of the watt disk emulator is equivalent to the value of the Kh of the LED.
As a result, a full revolution of the watt disk emulator produces a Kh of 6.0.
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