Operating Instructions Test device 1a.cdr - STS
Contents
1. of the test device If the device is to be connected in switch position 600 Ohm for an unlimited period to a voltage of lt 60 V then the current must not be greater than 57 mA at 60 V 40 Ohm connect a restistance of 1 5 Watt on line side with lt 54 V no resistance is necessary If a current of gt than 57 mA is to bew expected then switch on is only admissible with a series resistor The switch position 10 kOhm green serves the potential test click testing in high and low Ohm direct current circuits as well as the line tracking through listening into a sound signal the switch position 600 Ohm red is used during function tests in relay current circuits i fi fi signaltechniksprengergmbh Zum Kugelfang 24 D 95119 Naila Deutschland phone 49 92 82 9638 400 fax 49 92 82 9638 450 e mail info sts sprenger de www sts sprenger de2. Operating Instructions Test device no la test headphone The test device no la is used in local and long distance automatic exchange for testing error limiting and tracking of signals on the line According to the illustrated switching the impedance of the device can be changed over It has a value of 600 Ohm with closed switch S for d c and a c with opened switch the resistance for d c is approx 10 Mohm and in the frequency range of 500 4000 Hz gt 10 kOhm this means that when switching the device onto a line which is on both sides closed with 600 Ohm the insertion loss is lt 0 26 dB In this case the device has a receiving reference equivalent of lt 4 54 dB 3 6K e w R2 Jeo 1N4148 1N4148 i K VY T 3k S1 D1 D2 22nF All components are placed on a printed circuit board Further two screw clamps a b or soldering eyelets F F for connection of the cord or of the hearing system are also on this board A rotatable knurled disc at the back of the device activates the switch S This has a recess designed as a window in which appears according to the switch position a red field marked with 600 Ohm or a green field marked with 10 kOhm The use of the test device Prg la is only authorised for telecommunication engineering devices according to DIN VDE 0800 part1 The device tolerates a permanent load of max 2 Watt This value is not nearly reached with switch position 10 kOhm in the entire application area
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