15
Acute Technology Inc.
Copyright
2016
Operation with Oscilloscope
When the probe is connected to a oscilloscope, the displayed scale factor and measurement
values will be adjusted to account for the effective gain of the probe.
Through the oscilloscope software, the probe’s internal attenuation and offset can be
conveniently controlled through the oscilloscope’s user interface.
Turning the VOLTS/DIV knob will control the oscilloscope’s scale factor and the probe’s
internal attenuation to give full available dynamic range.
Some of the transition of the scale factor will result in a change of attenuation.
Offset null adjusting
The probe has offset capability. This allows you to remove a DC bias voltage from the
differential input signal while maintaining DC coupling.
The offset range of the probe is a function of the oscilloscope’s attenuation.
Some DC offset drift may occur from thermal effects and different power-ground loop.
The probe must have a warm-up period of at least 20 minutes and be in an environment that
does not exceed the limits described.
There are 3 offset trimmers for nulling the offset drift:
1. 10X/100X Coarse trimmer for both 10X/100X (or 20X/200X, 50X/500X) offset null.
2. 10X Fine-trimmer for 10X (or 20X, 50X) offset null.
3. 100X Fine-trimmer for 100X (or 200X, 500X) offset null.
After 20 minutes warm-up, you may switch 10X/100X (or 20X/200X, 50X/500X)
attenuation path to check their offset drift via oscilloscope.
If the offset drift exists on either attenuation path, you may open the Offset-cover by using
the Slot-end of the adjusting tool(PF-903).
WARNING.
To avoid risk of electric shock or fire, do not open the offset-cover as the
probe connecting to any under testing circuit or signal.
