6
WARNING:
AutoCheck
TM
mode input impedance increases abruptly from initial 2.5kΩ to a few hundred kΩ’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 1000VAC for example, can be up to
566mA (1000V x 1.414 / 2.5kΩ), decreasing abruptly to approx. 3.8mA (1000V x 1.414 / 375kΩ)
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 rotary selector
or
high input impedance voltage
modes to minimize loading for such circuits.
DCV, ACV, & Line Frequency functions
Press the Hz push-button for one second or more to activate or to exit Hz.
!
DCV
J A C K
J A C K
ACV
!
J A C K
J A C K
!
J A C K
J A C K
Hz
Note:
*Input sensitivity varies automatically with function range selected before activating the Hz
function. 6V function range has the highest and the 1000V range has the lowest. It is
recommended to first measure the signal voltage (or current) level then activate the Hz function in
that voltage (or current) range to automatically set the most appropriate trigger level. You can also
press the
RANGE
button momentarily to select another trigger level manually. If the Hz reading
becomes unstable, select lower sensitivity to avoid electrical noise. If the reading shows zero,
select higher sensitivity.
*Number of Bar-graph pointer is used to indicate input range (sensitivity) selected. 1/2/3/4 pointers
indicate 6/60/600/1000V, 6/10/-/-A, 60/600/-/-mA or 600/6000/-/-uA is selected in corresponding V,
A, mA or uA function respectively. ( “-” means range not available)
*The
Hz
of
mV
function is designed specially for logic level (3V or 5V family) frequency
measurement.
