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 MIL-HDBK-1023/4
(c) Turn on the regulator and advance intensity through each step.
(d) Read the output current on each step. The output current should be within
the tolerance shown below for the type of regulator specified.
TYPE
STANDARD
TOLERANCE AMPERES
20 ampere, 5 step
20.0
A
19.50-20.50
15.8
A
15.41-16.20
12.4
A
12.09-12.71
10.3
A
10.04-10.56
8.5
A
8.29-8.71
6.6 ampere, 5 step
6.6
A
6.47-6.70
5.2
A
5.07-5.33
4.1
A
4.00-4.20
3.4
A
3.22-3.49
2,8
A
2.73-2.87
6.6 ampere, 3 step
6.6 A
6.40-6.80
5.5 A
5.34-5.67
4.8 A
4.66-4.97
(e) If the current output is not within limits, check the voltage input to the
regulator. It should be within 5 percent of rated input voltage. Be sure the correct voltage tap
is used (on dry-type transformers).
(f) Turn off regulator.
(g) Disconnect the short and reconnect output cables.
(h) Compare the short circuit values with those obtained from the monthly
output current readings. If the values differ by more than the tolerance above, there is a problem
with the field loop or regulator.
(4) Open-Circuit Test. This test should be performed only on those regulators with
open circuit protective devices.
Caution: Close all control cabinet doors and access panels on regulator prior to open circuit
testing. Note: Flash over may occur at primary contactor during open circuit testing.
Caution: Do not repeat open circuit test repetitively on constant current regulators. Open
circuit test only once to determine pass or fail of open circuit protection. Note: Open circuits are
very stressful on constant current regulators.
(a) Turn off power to regulator.
(b) Disconnect cables from output terminals.
(c) Turn on power to regulator.
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