User Manual

DO143-1 © Copyright Pico Technology 2008 3
To avoid injury, remove jewelry such as rings, watches and other metallic objects.
Do not touch exposed connections and components when power is present.
Use proper power source
To ensure proper functioning of this probe, use four AA cells or a 6 V DC / 60 mA
mains adaptor or regulated 9 V DC / 40 mA mains adaptor or power lead.
Do not operate the probe if it is damaged
If you suspect there is damage to this probe, have it inspected by qualified service
personnel.
3. Description
By enabling conventional oscilloscopes to display and measure in-circuit
waveforms that are referenced to high common-mode voltages, this differential
probe extends the measurement capability of oscilloscopes to electronic power
converters, inverters, motor speed controls, switch mode power supplies, and
many other applications.
4. Installation
a. Simply plug in the BNC output connector to the vertical input of a
general-purpose oscilloscope or other measurement instrument, and connect
the auxiliary grounding terminal to a proper ground. The measurement
instrument must have a ground reference.
b. Install four AA cells or connect an appropriate power source to the probe.
c. Select the proper attenuation ratio. When measuring signals below 140 V,
switch the attenuation ratio to 1/20 in order to get higher resolution and less
noise. Otherwise, set the attenuation to 1/200.
WARNING To protect against electric shock, use only the
accessories designed for use with this differential
probe.
d. Using the appropriate probe accessories, connect the input to the circuits
under measurement.
CAUTION This probe is designed for carrying out differential
measurements between two points on
the circuit
under test. It is not intended for electrically
insulating the circuit under test and the measuring
instrument.