Specifications

with these knobs. Scales provided on a deadfront panel indicate all conventional film
sizes for both 40”, 72”, 100 cm and 180 cm SID’s.
All Eureka Linear Series collimators have a swivel mount configuration. Detents are
located at 90 degree increments. The collimator may be oriented to any position for
achieving proper X-Ray field to cassette alignment for table-top or non-bucky operation.
The shutter mechanism has been precisely aligned with respect to the mounting flange
at the factory. Therefore, the necessity for field alignment of the central ray has been
virtually eliminated.
6.2 ELECTRONIC OPERATION
The collimator electronics reside on a number of printed circuit boards:
- Power Supplies
- Lamp Timer Circuit
NOTE: Refer to Schematics 70-08358 and 70-08359
6.2.1 POWER SUPPLIES
The Linear MC150-C is designed to accept power from either a fused customer
supplied 24 VAC source or by means of an optional Eureka power supply P/N
70-20254.
In the case of a 24 VAC supply, power is supplied to the timer PCB 70-08359
where it is rectified, filtered and regulated by bridge B1, capacitor C1, and
regulator VR1 respectively.
When the MC150-C is supplied with the Linear MC150-C power supply (70-
20254, 120 VAC power source or 70-20288, 230 VAC) is fused through F1 and
stepped down by means of transformer T1. A 24 VAC tap on the secondary of
T1 is fused through F2 and applied directly to the collimator projection lamp
circuit.
November 2005 ( 6 - 3 ) Linear MC150-C Collimator
6.2.2 LIGHT-FIELD LAMP CIRCUIT Ref. 70-08358 & 70-08359
The light field lamp voltage is switched on and off by the 15 Amp Triac located
on the lamp bracket. The gate signal is controlled by the output of U1 with an
ON time of 25 seconds determined by R15 and C6. The timer is triggered by the
front panel “LAMP” push button switch. The surge resistor in series with the
lamp filaments offers high resistance at turn-on which reduces the in-rush
current thereby greatly extending the bulb life.