UNl/683
UNl/685
UNlL/687
UNlM/687P
UNl/688
UNl/7l5
UNl/7l9
UNl/720
UNlA/2
- 367
UNl
Time Counter Unit used in GElM/577 to accept sound pulses
and to generate BCD output signals for hours (up to 24),
minutes, seconds and frames. Printed circuit board, 203mm
x 254mm with 71 way edge connector. DD 1972. DDMI 7.261.
DDHB 7.187. EDI 10140(1)OCT72. OBSOLESCENT.
Fader Law Unit, used in PA1M/564 to produce from a varying
d.c. input a control signal for an AM5/520 giving a linear
relationship between fader setting and amplifier output
level. CHl/12A, pegs 50, 53. DD 1972. OBSOLESCENT.
Clamp and Trigger Unit, providing comprehensive
oscilloscope triggering facilities from 525 line or 625
line television signals. Comprises PN3A/16D with UNl/669,
UN13/508
and
PS2/l32A.
DD 1972.
DDMI 9.160.
OBSOLESCENT.
UNlL/687 in chassis type CHl/33 and carrying case CS2/llA.
DD 1972. DDMI 9.160. OBSOLESCENT.
Unit, used in CD2M/5l0 to scan a number of input
and produce appropriate data, and to detect a
of state at any of the inputs. CHI/63, coding 1,
DD 1972. DDTM 2.404. OBSOLESCENT.
Selector
signals
change
3, 10.
Amplitude Measuring Unit. Video signal measuring unit,
used with an oscilloscope for accurate measurement of
amplitude, coder and oscilloscope calibration. CHl/65D.
Superseded
by
ME3M/502.
DD 1975.
DDMI 9.216.
DDHB 9.118(77). EDIl0285(1)JUL76. OBSOLESCENT.
DD 1976. CANCELLED.
DD 1976. CANCELLED.
Termination Unit, 500, for use in VHF/UHF band.
mounted in standard BNC plug type GE35070 C25.
WITHDRAWN.
Resistor
DD 1966.
UNl Sub Group not available for new designs. DD 1977.
=======================================================~=======
UN2/50l
UN2/502
----------
----------
UN2 CALIBRATION UNITS
Provides approximately square waveform of about 20Kc/s at
either IV or 2V d.a.p. !l%. Open circuit for calibrating
oscilloscopes and setting up amplifiers etc. Z out: 750,.
Mains operated. 279mm x 229mm x 19lmm. Valves: 2 E88CC,
85A2, 6X4. DD 1958. DD Spec 9.8. ACO. OBSOLESCENT.
Provides square waveform at 2kc/s or 16kc/s of 0.2V, 0.4V,
0.8V, 2V, 4V, 8V, 20V or 40V for calibration of vertical
deflection
systems
of
oscilloscopes.
Mains
operated.
19lmm x 292mm x 229mm. Weight: 9Ib. Valves: 2 E88CC,

67