MOSMILTEC

Testing the Carl Zeiss Jena Einheitsdoppelfernrohr EDF 7x40

The rotational tests at the periodical reconditioning are very interesting.
Test conditions extracted from "A 050/1/501 Einheitsdoppelfernrohr 7x40 reconditioning" from 1982

• Leak tightness
  Over pressure test: Pressure inside 50,7 kPa (this means low head 5 m)
  Specification: Pressure drop not allowed
• Low head test
  Low head: 1 m
  Water temperature: 10 - 15 °C lower than unit temperature (this means underpressure inside the unit)
  Check-out time: 1 h
  Specification: No water nor fog inside
• Drop test
  Drop height: 0,75 m
  Direction: 1 drop straight horizontal on broadside
• Hit test
  Acceleration: 15 g
  Pulse duration: 5 - 10 ms
  Direction: 250 hits vertical on objective, 150 hits straight horizontal on broadside, 150 hits straight horizontal on narrow side
• Hit test
  Acceleration: 120 g
  Pulse duration: 1 - 5 ms
  Direction: 2 hits vertical on objective, 4 hits straight horizontal on broadside, 4 hits straight horizontal on narrow side
• Vibration stress
  Frequency range: 30 - 80 Hz
  Acceleration: 6 g
  Check-out time: 2 h vertical on objective side, 1 h straight horizontal on broadside, 1 h straight horizontal on narrow side
• Cold resistance
  -50 °C, Check-out time 2 h, after unit equalization of requested temperature, rubber parts to -40 °C
• Heat resistance
  +60 °C, Check-out time 2 h, after unit equalization of requested temperature
  Specification: No loss of grease
• Cyclic temperature test
  Upper temperature: +60 °C
  Lower temperature: -50 °C
  Check-out time: 5 cycle every 2 h
  Specification: No loss of grease
• Storage temperature
  +80 °C, Check-out time 1 h,  after unit equalization of requested temperature
  Specification: No loss of grease
• Sea water resistance
  Temperature: +27 °C
  Check-out time: 168 h
  Compounding: sodium chloride 27 g/l, magnesium chloride 6 g/l, calcium chlorid (free of water) 1 g/l, potassium chlorid 1 g/l
  Specification: No corrosion

There are some near mint conditioned EDF 7x40 oB available here.

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