IN2
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IN2/3
Supply Level Alarm Indicator, to monitor up to 12 sources
of 50V supply and give audible and visible alarm
indications if the potential of any source falls below an
adjustable pre-determined voltage. CHl/12B. SCPD 1971.
OBSOLESCENT.
IN2/501A-E
Alarm Indicator and Integrator used in automatic monitors
to summate alarm signals and deliver an external alarm
after a specific duration or number of alarms have been
received. Suffixes indicate different time constants and
signalling arrangements to suit associated monitors.
CHl/l2A, with space for power supplier card, pegs 16, 26.
DD 1965. DD Spec 12.15. ACO. OBSOLESCENT.
IN2/503
Alarm Indicator used in EP1/519 and mounted in PA1M/559,
to indicate audibly the absence of a cue dot at a specific
time. CH1/12A. DD 1969. DD Spec 11.99. WITHDRAWN.
IN2 Sub Group not available for new designs DD 1977.
IN3 BEAT INDICATORS
IN3/501
Used in EP4/501 to indicate when
synchronised with the frame pulse
DD 1956. WITHDRAWN.
f Um motor
repetition
speed is
frequency.
IN3 Sub Group not available for new designs DD 1977.
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IN4 CUE INDICATORS
IN4/501
DD 1969. WITHDRAWN.
IN4 Sub Group not available for new designs DD 1977
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INS FAULT INDICATORS
IN5/1
IN5/2
Drive Fault Indicator. DD 1961. WITHDRAWN.
Ringing Current Fault Indicator used in PAlM/67.
diagram on front panel gives fault indication
052/36. Has provision for a common external
CH1/18E, pegs 22, 39. DD 1968. OBSOLESCENT.
Mimic
for 3
alarm.

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