N7026A Probe
N7026A 150 MHz AC/DC High Sensitivity Current Probes User’s Guide
23
Obtaining the Best Measurement Accuracy
To obtain the best measurement accuracy, ensure that:
- The current direction indicator on the sensor aligns with the actual current direction in
the insulated conductor.
- The sensor opening lever is in the Locked position and the sensor head is properly
closed.
- The conductor under test is positioned in such a way that it is in the center of the sensor
head aperture.
- Bushing is installed on the probe’s sensor aperture if the diameter of the conductor
under test including its insulation is less than 1.65mm. Refer to the topic
“Installing and
Removing Bushing"
on page 24 to know more.
- At high frequencies, common mode noise may affect measurements taken on the high
voltage side of circuits. If this occurs, reduce the frequency range of the measuring
instrument or clamp onto the low-voltage side of the circuit as shown in
Figure 5
, as
appropriate.
Figure 5
Clamp Onto the Low-Voltage Side of Circuit
NOTE
Accurate measurement may be impossible in locations subject to strong external
magnetic fields, such as transformers and high-current conductors, or in locations
subject to strong external electric fields, such as radio transmission equipment.
NOTE
When performing continuous measurements, it is necessary to be aware that the zero
offset voltage will drift if the ambient temperature changes.
