14
DC/AC MicroProbe Models K100 and K110
4. OPERATION
4.1 MAKING MEASUREMENTS WITH THE K100/K110
• Remove any conductor from within the probe jaws.
• Plug the electronic module into the displaying device (e.g., DMM,
oscilloscope). Note the polarity of the module output banana plugs
(red = positive [+], black = negative [-]).
• Select the appropriate range on displaying device (e.g., DMM,
oscilloscope). Note that the module output is 1 mV/mA for Model K100 and
10 mV/A for Model K110.
• Turn displaying device power ON. Turn on the Model K100/K110 (the
green LED should be ON, and the red LED OFF).
• With the probe disconnected from test samples (no conductor in probe
jaw window), adjust the zero control (push in the knob and turn) to read
zero volts on the displaying device. In the unlikely event where the zero
point is unobtainable, refer to
Residual Readings Following Severe
Overloads
(§ 4.6) - the Model K100/K110 probe may be temporarily
magnetized.
• Clamp the probe around the conductor to be tested. The displaying
device should now display the measured conductor current. In DC, a
positive reading indicates current flowing in the direction of the arrow
on the probe. A negative reading indicates current flow in the opposite
direction of the arrow.
4.2 INDICATOR LIGHTS - GREEN AND RED LEDS
• The Green LED indicates that the Model K100/K110 is ON and that
the battery is good. The Green LED will not light under low battery
conditions. Replace the 9 V battery if the green LED is not lit.
• The Red LED indicates a momentary or continuous overload of the
instrument. Readings taken while the Red LED is ON or FLASHING
should be considered inaccurate. Momentary or continuous currents
exceeding ± 4.7 A for Model K100 and 470 mA for Model K110, and
dynamic currents with large step discontinuities will cause the red LED
to turn ON.
