Electricity, and in today's world electronics, have given birth to a wide array of devices that can enhance security in ways unthinkable even a decade ago. This month's quiz is based upon the technology that to many long-time security dealers was once cutting-edge. For fun, see how much you know about security technology before microprocessors were introduced.

Answers on page 78.

What's Wrong with This?

Wally Larman installed an ADEMCO 1003 Deluxe Control Instrument with an ADEMCO 612 Automatic Telephone Dialer at one of his commercial customersâ' sites, and connected it as shown in this diagram. When Wally tested the system it worked fine locally, but every time his customer turned the key switch to bell test and left for the night, the 612 dialer was activated. Can you see what Wally did wrong and what he must do to correct the problem?

Why Does this Keyswitch Inadvertently Activate the Dialer?

1. In a McCulloh system the sub-

scriber's transmitter could send

a. two rounds for exit.

b. three rounds for an alarm.

c. one round for a restore.

d. All of the above

e. None of the above

2. Which of the following is an

example of a subscriber’s

McCulloh control panel?

a. ADEMCO 401

b. Potter BAT-A

c. Imperial MCPT1

d. All of the above

e. None of the above

3. What were the nominal current

settings for a direct wire system?

a. 20ma night

b. 30ma day

c. 40ma night cross

d. All of the above

e. None of the above

4. What is the nominal voltage

for a #6 dry cell?

a. 1 1/2

b. 6

c. 12

d. 24

e. None of the above

5. What is the correct AC input

voltage to an ADEMCO 330 control?

a. 6

b. 12

c. 24

d. 120

6. What is the correct AC input volt-

age to an ADEMCO 330R control?

a. 6

b. 12

c. 24

d. 120

7. Which of the following was

a microwave detector

manufactured by Solfan?

a. 2400

b. 2500

c. 2600

d. All of the above

e. None of the above

8. How many slave detectors

could be connected to a

Solfan 2800 master?

a. 1

b. 2

c. 5

d. 10

9. Which of the following was a

vault sound detection system

manufactured by Potter?

a. PSA-S

b. MSA


d. All of the above

e. None of the above

10. Which of the following was

a direct wire subscriber

control panel?

a. Potter SCB

b. Damon DCU-2

c. ADEMCO 422

d. All of the above

e. None of the above

11. A Potter DLP-9 could be used

to provide UL Grade AA service.

a. True

b. False

12. Which of the following was a

self-contained ultrasonic detector?

a. Aritech 101

b. DS 501

c. ADEMCO 450

d. All of the above

e. None of the above

13. The EOL resistor for a Solfan

ZA-4 zone panel was 1K.

a. True

b. False

14. The Raytek 8220 was a self-

contained microwave detector.

a. True

b. False

15. The 6SN7 was a power supply

used for UL certified Grade A

local systems.

a. True


Answer to What’s Wrong with This?

Wally's problem is caused by the jumper he installed between terminals C and D. Wally should remove the jumper, as shown in this diagram, and re-test the system. One should only install the jumper when using the A and B terminals for externally powered local notification devices. The green and white wires were used in conjunction with the ADEMCO 355 delay module to provide an entry/exit loop.


Here are the answers to the 5-Minute Tech Quiz and What's Wrong with This?, which appear on page 31. (Please note that the answers shown here are based upon requirements and equipment that may no longer be applicable or available, but at the time the various devices were manufactured and in common use.)

1. d While all McCulloh burglary controls did not transmit closing or restore signals, some did have the ability to do so.

2. d

3. d As with McCulloh systems, nominal readings on direct wire systems could vary by manufacturer and applied voltage but these were the most common settings.

4. a The #6 dry cell was a non-rechargeable battery that formed the backbone of security systems.

5. d

6. b The 12-volt transformer powered either a 492 (250ma 2.5 AH) or a 493 (750ma 5 AH) power supply.

7. d

8. c

9. d

10. d

11. a A DLP-9 could be used for Grade AA service if one utilized two direct wire circuits at the subscriberâ's location, each with a Potter SCBIM module installed in the control box.

12. d

13. b The correct EOL for a Solfan 4-zone ZA-4 panel was 2.2K.

14. b The Raytek 8220 was a PIR detector.

15. b The 6SN7 was a medium-MU twin triode vacuum tube used in Kiddie 120 ultrasonic controls.