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• Always zero the Model K100/K110 prior to making a measure-
ment. See §4.1 for procedure.
• Make sure that probe jaw mating surfaces are free of dust and
contamination. Contaminants cause air gaps between sensor
halves, making the Model K100/K110 susceptible to external
magnetic fields which can contribute to measurement errors. See
§5.3 for cleaning procedure.
• Do not allow probe jaws to abruptly snap closed from the open
state. This can lead to residual readings. If this happens, the
Model K100/K110 will need to be rezeroed.
• Beware of short-circuit currents. Large in-rush currents (which can
occur when power is first applied in a circuit) and large high-cur-
rent transients may cause varying degrees of residual readings.
If in doubt of a particular reading, remove the probe from the con-
ductor under test and check to see that the display device returns
zero. If not, it will be necessary to rezero the Model K100/K110.
• When using the Model K100/K110 to measure AC currents, keep
in mind the maximum current ratings and the frequency response
curves shown in the electrical specifications section. Dynamic
currents that contain large step discontinuities and/or frequency
constituents near or beyond the measurement passband are
subject to measurements errors and waveform distortion (oscil-
loscope display). If the red LED comes on during measurement,
the MicroProbe's output signal may be in error.
Many DVMs provide null (relative) measurement capability. A DVM placed
in the null mode displays the difference between a stored null value and
the input signal.
• You can use a DVM's null function in place of the external DC zero
control to cancel any DC offset from the K100/K110. The DVM
null function should be enabled with the probe removed from the
conductor immediately before measurement.
• You can use a DVM's null function to display changes in mea-
sured current from a fixed (constant) level. In this application, the
DVM null function is enabled with the probe connected to the con-
ductor.
When making null (relative) measurements, the probe aperture current
(not displayed current) must not exceed the maximum ratings set forth in
the specifications section.
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DC/AC MicroProbe Models K100 and K110
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