Ametek 7100 Leak Detect Stik Manual de usuario descargar pdf (Pagina 13)

Figure 7: Typical Console Circuitry

Comparator

+1 VDC

Reference

Always use the

leading edge

Counter

Gating Circuit

High Speed

Counters

High Speed Clock

(20-110 mH)

Intrinsic Safety Barrier

Return signals are coupled through the VCC Pin and the

150 Ohm barrier resistor and coupling capacitor to the

step-up pulse transformer. The inductor passes the 24

Volts without shorting the return pulse.

5:1 Pulse

Transformer

2981 or Equivalent

(PNP Driver I.C.)

8 Probe

Connections

49.9K

Metal Film

GNDVCC

+24 VDC

1 mH.

150

0.1 uF.

VCC

GND

5 Volt Logic

Probe Select Lines

(only one line is

active at a time.)

Latch

Microcomputer

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Ametek 7100 Leak Detect Stik Manual de usuario Pagina 13