Metrel MD 9040 Digital-Multimeter, DMM, 20991440 Hoja De Datos
Los códigos de productos
20991440
MD 9040 & MD 9050 Digital multimeter
Operation
9
*Ghost-voltage Buster:
Ghost-voltages are unwanted stray signals coupled from
adjacent hard signals, which confuse common multimeter voltage measurements. Our
AutoCheck
AutoCheck
TM
mode provides low (ramp-up) input impedance (approx. 3kΩ 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
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 3kΩ 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 471mA (1000V x 1.414 / 3kΩ), decreasing abruptly
to approx. 3.1mA (1000V x 1.414 / 460kΩ) within a fraction of a second. Do not use
AutoCheck
users of being in such low impedance mode. Peak initial load current, while probing
1000VAC for example, can be up to 471mA (1000V x 1.414 / 3kΩ), decreasing abruptly
to approx. 3.1mA (1000V x 1.414 / 460kΩ) 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.
dBm
dBm
+Hz
(for MD9050 only), Hz
+ACV
, ACV
+Hz
functions
Press the SELECT button momentarily to select the subject functions in sequence. Last
selection will be saved as power up default for repeat measurement convenience.
selection will be saved as power up default for repeat measurement convenience.
Note: Hz Input sensitivity varies automatically with voltage (current function alike) range
selected. 1V range has the highest and the 1000V range has the lowest. Auto-ranging
measurements normally set the most appropriate trigger level. You can also press the
RANGE button momentarily to select another trigger level (voltage range) manually. If
the Hz reading becomes unstable, select higher voltage range to avoid electrical noise.
If the reading shows zero, select lower voltage range.
Note: In dBm
+Hz
function, power up default reference impedance will be displayed for 1
second before displaying the dBm readings. Press dBm-
(RANGE) button momentary
to select different reference impedance of 4, 8, 16, 32, 50, 75, 93, 110, 125, 135, 150,
200, 250, 300, 500, 600, 800, 900, 1000, up to 1200
200, 250, 300, 500, 600, 800, 900, 1000, up to 1200
. Last selection will be saved as
power up default for repeat measurement convenience. Manual trigger level selection
on Hz reading is not available.
on Hz reading is not available.