Bosch Appliances DS938Z manual Final Tests 6.1 Noise Measurement, Wiring

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 (-)).

CAUTION!

Be sure all wiring is unpowered (de-energized) before routing.

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.

NOTICE!

Be sure the TC6000 and Sonalert leads are dressed through the cut- out.

4.Apply power to the unit.

5.Wait at least two minutes, after applying power, to start walk tests.

NOTICE!

Walk testing should be done across the coverage pattern as shown.

REAR WIRE	TERMINAL
ENTRANCE	STRIP
	1
WIRE	8
TIE-DOWNS (2)
MOUNTING	INTERFACE
SLOTS (4)	PINS

Mounting Base

Figure 2.3: Overview

ANTI-T AMPER SCREW HOLE

REQUIRED FOR EN50131

INST ALLA TIONS

	TEST LEAD SOUNDER	ALARM/TEST LED
		INDICATOR (3)
	CUTOUT
	NOISE
	VOLTAGE
	LO
	HI
	ON
	OFF
GAIN SELECT
JUMPER
LO		COVER
HI	CONFIGURATION	TAMPER
	SWITCHES
	ANTI-TAMPER SCREW HOLE
	REQUIRED FOR EN50131
	INSTALLATIONS
	Top View of Enclosure
	with Cover and Optical Module Removed

6.The edge of the coverage pattern is determined when the Alarm/Test LED indicator (and optional Sonalert®, if installed) first 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).

6 Final Tests

6.1 Noise Measurement

NOTICE!

Meter readings are very important in determining background distur- bance levels and catch margin sensitivity.

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 fluctuates greatly.

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.

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

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.

8 © 2012 Bosch Security Systems, Inc. F.01U.263.663 01 05.2012 5