Wavetek 220 Instrukcja Operatora Pobierz pdf (Strona 21)

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LOGIC TEST (See Fig. 8)

The logic test indicates a TTL high, low or changing logic signal. ❶ Turn the

range switch to the logic position. The LCD will display a I0L and the word

“Logic.” ❷ Connect the black test lead to circuit common or ground point and

the red lead to the test point. A logic LOW will display the down arrow a with a

tone, a logic HIGH the up arrow without tone, and a changing signal will alternate

the arrows and tone. Above 15Hz the tone may be intermittent then go steady

above 100Hz. Above 200Hz the up/down arrows both stay on solid. See the “

MEM” button instructions for detecting fast pulses and waiting for one-shot

changes without having to observe the meter.

FUSED

MAX

430mA

MAX

10A

VCOM

CAT II1000V

CAT III 600V

FUSED

10A MAX

1000V

750V

OFF

430

LOGIC

430

GND

TTL

10A

REL

Logic Test enabled

(Use " MEM" to enable and clear)

Pulse Indicator

High Pulse

Present

(no tone)

Low Pulse Present (tone)

RANGE

HOLD

220

MEM

LOGIC MEM LOGIC MEM

red

rot

roja

rouge

LOGIC TEST

SLEEP

OFF

MIN MAX

Fig. 8

220.Man.08.00 9/11/00 6:05 PM Page 19

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