Wavetek Meterman 220 Manuel D'utilisation page 21

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.
High Pulse
Present
MIN MAX
A
V
V
OFF
mA
10A
Fig. 8
LOGIC TEST (See Fig. 8)
Pulse Indicator
(Use " MEM" to enable and clear)
LOGIC MEM LOGIC MEM
(no tone)
Low Pulse Present (tone)
220
REL RANGE
SLEEP
MEM
OFF
LOGIC
430 u A
1
COM
FUSED
MAX
430mA
1000V
FUSED MAX
750V
10A MAX
Logic Test enabled
HOLD
43
mA
430
mA
10A
V
CAT II1000V
CAT III 600V
- 19 -
LOGIC TEST
TTL
red
2
rot
roja
rouge
GND