Testing An Electronic Standard (Electronic Gating) - Radian RM-111 Operation Manual

12.0 Testing an Electronic Standard (Electronic Gating)

Equipment Needed:
• RM-111 Automated Comparator
• RM or RD Primary Reference Watthour Standard
• Electronic standard with a gate input
• RM-1R Electronic/Mechanical Potential Relay
Test Steps:
1. Make the appropriate connections so that the standard(s) under test (DUTs) and the RM or RD
Primary Reference Standard(s) are powered from the same voltage and current source.
2. Apply test voltage, current and auxiliary power. At this point, the RM or RD Reference
standard(s) should be counting.
• Connect all standard pulse outputs to the RM-111.
• The RM or RD Primary Reference Watthour Standard will output pulses continuously once
auxiliary power, voltage and current have been applied.
• There are several Electronic Standards that can be tested by electronically gating the display.
For testing a SC-10V, A-7 or SC-30, follow the guide for each below, when using a Radian
RM or RD series standard as the reference standard.
• SC-10 and A-7: The number of standard pulses for the reference standard to count when
testing the D.U.T. at 120 volts and 5 amps at 1.0 power factor on the 5 amp tap = 60,000.
• Older generation induction and electronic standards display "equivalent revolutions" instead
of "watthours." The Kh of these older standards is usually 0.6 watthours per equivalent
revolution when tested at 120 volts, 5.0 amps at 1.0 power factor. To determine the proper
number of output pulses from the reference standard, use the following as a guide. If the
reference standard for this test is a Radian standard that outputs 100,000 pulses per watthour,
multiply 100,000 times the Kh of 0.6 which results in 60,000. Enter this value as the "number
of reference standard pulses to count" for a one revolution test of the DUT To select
the number of pulses to count for the 1.0; 12.5;15.0 and 50.0 amp taps, refer to section 20 of
50
Application 6 Application 6
RM-111 Operations Manual