Detection Systems DS7092 Especificações descarregar pdf (Página 136)

(3)

(4)

(5)

(6)

(7)

Figure 21. Fabrication of special test cables.

Use the Transistor Power Supply

721A and apply +5 volts dc to the

test probe.

Measure the voltage at connector

P7801-H with the ME-26B/U; ad-

just potentiometer R7803 for ap-

proximately +0.5 volt dc.

Measure the voltage of the emitter

of transistor Q7801 (ungrounded

side of potentiometer R7801) with

the ME-26B/U; adjust potentiom-

eter R7801 for approximately +1

volt dc .

Measure the 721A output with the

TS443/U; increase the output to

13.0 volts dc.

Measure voltage at the emitter of

transistor Q7801 with the ME-

(8)

(9)

(10)

26B/U; adjust potentiometer R7801

in the increasing voltage direction

until a sharp drop in voltages indi-

cates transistor Q7801 has trig-

gered. This should occur at

approximately +9.5 volts dc.

Reduce the output of the 721A to

zero, then carefully increase it to

10.5 volts dc as indicated by the

TS-443/U.

Measure the dc voltage at connec-

tor P7801-H with the ME-26B/U;

carefully a d just potentiometer

R7803 until a sudden drop in the

measured

voltage

indicates

GREEN indicator DS7902 has

switched on.

Reduce the output of the 721A to

1 2 ... 131 132 133 134 135 136 137 138 139 140 141 ... 180 181

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