- 16 -
Note:
*Range-Lock and Function-Lock Feature:
When a measurement
TM
reading is being displayed in
AutoCheck
mode, press the
RANGE
or
SELECT
button momentarily 1 time can lock the range
or function it was in. Press the button momentarily repeatedly to
step through the ranges or functions.
*As Hazardous-Alert
: When making resistance measurements in
TM
AutoCheck
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
TM
common multimeter voltage measurements. Our AutoCheck
mode provides low (ramp-up) input impedance (approx. 2.5kΩ 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.
TM
AutoCheck
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. 3.37mA (1000V x 1.414 / 420kΩ)
TM
within a fraction of a second.
Do not use AutoCheck mode on
circuits that could be damaged by such low input impedance.
Instead, use rotary-switch selector or high input impedance
voltage modes to minimize loading for such circuits.
WARNING:
- 17 -
Hz
Hz
VFD-ACV & ACV functions
Inputs are made through the test leads terminals.
Hz
VFD-ACV
function is to deal with VFD (Variable Frequency Device)
signals. It, however, further pre-selects the most appropriate voltage-
ranges and thus the Hz trigger levels to best cope with most VFD-
Voltage and VFD-Frequency applications.
Note: The Hz trigger level is determined by the
AC/DC+AC Voltage
or Current
function-range being in use. Press
RANGE
button to
select different function-ranges and thus trigger levels manually.
Inputs are made
through the test
leads terminals.
Defaults at
DCV
Function.
Press
SELECT
button momentarily
and release to select
Hz
DC+ACV
.
Hz
DCV & DC+ACV
functions
VFD
220.8
V
60.8
Hz
AUTO
VFD
VFD
V
Hz
268.2
V
1002
Hz
AUTO
V
Hz
