8 © 2012 Bosch Security Systems, Inc.
NOTICE!
The use of a Sonalert type device (sounder) will provide an audible
tone during the time the unit is in alarm. Of the three available connec-
tor pins, the center pin is positive (+) with respect to either outside pin
(outside pins are common (-)).
Use of the sounder is intended only as an aid for walk testing during
installation.
3. Place the cover on the unit, and twist-lock it clockwise into place.
4. Apply power to the unit.
5. Wait at least two minutes, after applying power, to start walk tests.
6. The edge of the coverage pattern is determined when the Alarm/Test
LED indicator (and optional Sonalert®, if installed) fi rst turns on.
7. Walk test the unit from all directions to determine the boundaries.
8. After completion of the walk tests, remove the Sonalert® (if installed).
NOTICE!
Be sure the TC6000 and Sonalert leads are dressed through the cut-
out.
NOTICE!
Walk testing should be done across the coverage pattern as shown.
6 Final Tests
6.1 Noise Measurement
1. Connect a 20,000 ohm/volt (or greater) DC VOM to the Noise Voltage
connector using the TC6000 as shown. Set meter scale for about 3.0
VDC.
2. The base reference level for reading background noise or target volt-
ages is approximately 2.0 VDC. Installations in quiet environments,
therefore, will result in a steady meter reading between 1.9 and 2.1
VDC. Look for areas and sources of thermal disturbances if the meter
fl uctuates greatly.
NOTICE!
Meter readings are very important in determining background distur-
bance levels and catch margin sensitivity.
F.01U.263.663 | 01 | 05.2012 | 5
CAUTION!
Only apply power after all connections have been made and inspected.
Do not coil excess wiring inside detector.
Use no smaller than #22
AWG (0.8 mm) wire in the terminal strip.
CAUTION!
Be sure all wiring is unpowered (de-energized) before routing.
Mounting Base
REAR WIRE
ENTRANCE
WIRE
TIE-DOWNS (2)
TERMINAL
STRIP
INTERFACE
PINS
MOUNTING
SLOTS (4)
18
Top View of Enclosure
with Cover and Optical Module Removed
ALARM/TEST L
INDICATOR (3
SOUNDER
NOISE
VOLTAGE
CONFIGURATION
SWITCHES
COVER
TAMPER
ON
OFF
TEST LEAD
CUTOUT
ANTI-TAMPER SCREW HOLE
REQUIRED FOR EN50131
INSTALLATIONS
REQUIRED FOR EN50131
INST ALLA TIONS
LO
HI
GAIN SELECT
JUMPER
HI
LO
NOTICE!
The DS938Z base will not completely cover a 4-inch square box. Where
aesthetics are important, a 4-inch octagonal box is recommended.
NOTICE!
Mounting to removable ceiling tiles is not recommended unless a
sandwich is made of the base, ceiling tile, and a back plate behind the
tile. Covers used for 4-inch octagonal and square boxes make a suitable
back plate (when used with bolts and wing nuts, as an example).
3 Wiring
Figure 2.3: Overview
4. Firmly mount the base. Depending on local regulations, the base may
be directly surface mounted using anchors, mollies, or wing-nuts, or
may be mounted to standard 4-inch octagonal or square electrical
boxes.
