METREL MD 9231 Manual Del Usuario página 14

MD 9231 Industrial TRMS AC/DC Current Clamp Meter
1. Using Capacitance function in a live circuit will produce false results and may damage the meter. In many
cases the suspected component(s) must be disconnected from the circuit to obtain an accurate
measurement reading.
2. When using Capacitance function, discharge capacitor(s) before making any measurements. Large value
capacitors should be discharged through an appropriate resistance load.
Using the Complementary Beeper feature
The Complementary Beeper feature is selected in Power-up option. Press and hold the REC button while
turning the meter on to enable. If the segments indicate a clockwise movement, the beeper sounds a single
long beep per segment cycle. If the segments indicate a counter clockwise movement, the beeper sounds 3
short beeps per segment cycle.
Hold
Hold feature freezes the display for later view. LCD " " turns on. Press the HOLD button momentarily to toggle
the hold feature.
Record mode
Press REC button momentarily to activate MAX/MIN/AVG recording mode. LCD " " & "MAX MIN AVG" turn
on. The meter beeps when new MAX (maximum) or MIN (minimum) reading is updated. AVG (Average) reading
is calculated over time. Press the button momentarily to read the MAX, MIN and AVG readings in sequence.
Press the button for 1 second or more to exit this mode. Auto-Power-Off is disabled automatically in this
mode.
Relative-Zero (Δ) mode
Relative-Zero allows the user to offset the meter consecutive measurements with the main display displaying
reading as the reference value. LCD "Δ" turns on. Press the Δ (HOLD) button for one second or more to toggle
Relative-Zero mode.
DC-Zero mode is set instead of Relative-Zero mode, however, to only offset the non-zero DCA residuals
caused by magnetic hysteresis of the jaws as in DCA & DC+ACA functions. Press the Δ (HOLD) button for one
second or more to activate/ re-activate this mode. Apply this mode before making any single DCA or DC+ACA
measurement for best measuring accuracy. The meter shows "dc_0" shortly to confirm activation before
continuing measurements. The beeper will sound 3 short beeps, however, to warn for null activation if the
residual is beyond a reasonable hysteresis reading of -5 to 5 DCA.
80ms PEAK-RMS mode
Press PEAK-RMS button for one second or more to toggle PEAK-RMS mode to capture inrush current or
voltage RMS values in duration as short as 80ms. LCD
automatically in this mode.
5ms CREST mode
Press CREST button for one second or more to activate CREST mode (Instantaneous PEAK-HOLD) to capture
current or voltage peak values in duration as short as 5ms. LCD
new MAX (maximum) or MIN (minimum) reading is updated. Press the button momentarily to read the MAX
and MIN readings in sequence. Press the button for 1 second to exit this mode. Auto-Power-Off is disabled
automatically in this mode.
Flashlight & Backlighted LCD display
Press the button momentarily to toggle the LCD backlight & flashlight ON and OFF. The backlight &
flashlight will also be turned off automatically after 32 seconds to extend battery life.
turns on. Auto-Power-Off is disabled
& "MAX" turn on. The meter beeps when
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Operation