Elma 117 - 118
Page 49
Note:
•
Range-Lock Feature:
When a measurement reading is being displayed in AutoCheck
TM
mode, press the
RANGE
button momentarily 1 time can lock the function-range it was in.
The LCD annunciator “
” turns off. Range-lock can speed up repetitive
measurements. Press the button momentarily repeatedly to step through the ranges. Press
and hold the button for 1 second or more to resume AutoCheck
TM
mode.
•
As Hazardous-Alert:
When making resistance measurements in AutoCheck
TM
mode, an
unexpected display of voltage readings alerts you that the object under test is being
energized.
•
Ghost-voltage buster:
Ghost-voltages are unwanted stray signals coupled from adjacent
hard signals, which confuse common multimeter voltage measurements. Our AutoCheck
TM
mode provides low (ramp-up) input impedance (approx. 1.6k
Ω
at low voltage) to drain
ghost voltages leaving mainly hard signal values on meter readings. It is an invaluable
feature for precise indication of hard signals, such as distinguishing between hot and open
wires (to ground) in electrical installation applications.
WARNING:
•
AutoCheck
TM
mode input impedance increases abruptly from initial 1.6k
Ω
to a few hundred
k
Ω
’s on high voltage hard signals. “
LoZ
” displays on the LCD to remind the users of being
in such low impedance mode. Peak initial load current, while probing directly to 600VAC for
example, can be up to 530mA (600V x 1.414 / 1.6k
Ω
), decreasing abruptly to approx. 4mA
(600V x 1.414 / 210k
Ω
) within a fraction of a second. Do not use AutoCheck
TM
mode on
circuits that could be damaged by such low input impedance. Instead, use slide-switch
function selector
common input impedance voltage modes (Hi-Z of approx. 5M
Ω
) to
minimize loading for such circuits.
Manual or Auto-ranging
When the function selected has more than one range, press the
RANGE
button momentarily
selects manual-ranging. The meter remains in the range it was in. The LCD annunciator
turns off. Press the button momentarily again to step through the ranges. Press and hold the button
for 1 second or more to resume auto-ranging.
Note:
*Manual-ranging feature is not available to
600
Ω
/
/
functions.
*To use Manual-ranging feature in AutoCheck
TM
mode, please see “Range-Lock Feature” as
explained in footnotes of AutoCheck
TM
mode section.
Содержание Auto-Check 117
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