10
Operation
9
Low Battery Indicator
High Voltage Warning
Auto Power Off
HOLD Button
The Low Battery Indicator ” ” will appear on the LCD display when the batteries
need replacement. Replace the batteries immediately to insure accurate and
reliable operation. If the battery voltage falls below the minimum recommended
level, the clamp meter beeper will beep four times and the meter will shut down.
Replace the batteries to restore operation.
When measuring voltage, the high voltage symbol “ “ will appear on the
display if the voltage equals or exceeds 30V. Use caution on live circuits.
Voltages above 30 VAC RMS, 42 VAC peak, or 60 VDC pose a shock hazard.
Whenever the clamp meter is on, you will notice the Auto Power Off or APO
symbol displayed in the lower left corner of the LCD screen. This symbol
means that the APO function is active. The APO function helps conserve
battery life. The APO function works as follows: After approximately 14
minutes of inactivity, the meter will beep 5 times indicating that auto power
off or APO is about to occur. After approximately 15 minutes of inactivity,
the meter will beep once and then turn off. If APO turns the meter off, you
can turn the meter back on by momentarily pressing the HOLD button.
To freeze the reading on the LCD display, momentarily press the HOLD button.
The “HOLD” indicator will appear on the LCD display. Momentarily press the
HOLD button again to return to normal operation. The HOLD value will be lost
if the position of the meter dial is changed or the meter is turned off.
HOLD
AUTO Indicator
The 21005N clamp meter is an auto-ranging meter which means that the meter
automatically selects the most appropriate measurement range for the testing
that is being conducted. Auto-ranging is the default mode for the clamp meter
and there is no option to select manual ranging.
Disconnect the test leads and temperature probe from
the meter before making current clamp measurements. Do not measure
current on conductors that are more than 600V above earth ground.
Observe all safety precautions when working on live conductors.
AC Current Measurements
WARNINGS:
1. Set the rotary function switch to the 20A or 200A position.
2. If you are unsure of which position to use, select the higher 200A range
first. If the current reading appears too small, switch to the 20A range if
desired.
3. Press the trigger to open the jaw. Clamp around a single conductor
making sure the jaw is fully closed before taking a measurement.
For best results, keep the conductor centered inside the jaw. Small
arrows molded into the clamp jaw indicate the optimum placement
of the wire.
4. Read the current on the LCD display.
When measuring current on a 1-phase, 2-wire circuit, the clamp meter should
be placed around one (not both) of the wires. See illustration below. Appliance
and lamp power cords have two insulated wire conductors: the hot or live
conductor and the neutral and ground conductors. Installing a clamp meter
around both conductors will result in a reading of approximately zero amps
because the current flowing through the live or hot wire will effectively cancel
out the current flowing back through the neutral and ground wires. The
Southwire 60040S AC line splitter conveniently separates the hot from the
neutral and ground conductors, eliminating the need to physically separate
the wires.
