Application 12
18.0 Interfacing a Solid State Meter to a Test Board
(Open Collector Option)
Equipment Needed:
• RM-111 Automated Comparator
• Meter test board with open collector input
• Solid state meter programmed with a known number of infrared LED calibration
pulses per Kh
• RM-1H or RR -1H Optical Pickup
Test Steps:
1. Install the meter to be tested into the test board socket fi xture.
2. Turn on the RM-111 and select RUN TESTS.
3. Select Pulse Divider.
4. Enter the number of pulses in for one pulse out.
5. Enter the number of pulse input ports (1-3).
6. Select the pulse output type. For this application, choose Open Collector.
7. Make proper connections to the RM-111, see fi gure 18.0. Connect Pulse IN(s) to port(s) A, B,
and/or D and Pulse OUT to port D.
8. Set up the test board to test the solid state meter. Include all variables such as: form number,
volts, current, and number of pulses per revolution.
9. Start the test on the test board. The RM-111 starts receiving pulses. After the specifi ed number
of pulses has been counted the RM-111 outputs one pulse. This continues until the RM-111’s
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