Pico Technology
TA041 User’s Manual
DO141-4
© Copyright Pico Technology 2008–2012
7
9.
Test procedure
1.
Connect the BNC output connector to the vertical input of a general-purpose
oscilloscope.
2.
Install four AA cells or connect an appropriate mains adaptor to this probe.
3.
Set the oscilloscope input coupling to DC and 1 V/div. Center the trace on the
display.
4.
Connect the sprung hooks of the probe to power lines.
5.
Set the range of the probe to 1:100.
6.
A 50 Hz or 60 Hz sine wave of proper amplitude will be displayed on the
screen of the oscilloscope. This means the probe is working properly.
10.
Calibrating the unit
There are three main sources of uncertainty when calibrating a Pico differential
probe in addition to any uncertainty in the test setup. These are:
1.
The stated DC accuracy of the probe under test (±2%).
2.
Any DC offset or noise in the probe output. The values in this manual are
typical, so to find the DC offset for a given unit a reading must be taken with
the inputs to the probe shorted together.
3.
The AC performance of the probe. This is specified as being within 3 dB over
the entire frequency range of the probe. Any absolute voltage accuracy testing
must be done under DC conditions.
One other possible source of noise is the power source for the probe. It is
recommended that where possible the probes are calibrated using a battery supply
rather than a mains supply unit.
The adjustment procedure is available from Pico Technology on request.
11.
Cleaning
Use a soft cloth to clean the probe, taking care not to cause damage.
1.
Do not immerse the probe.
2.
Do not use abrasive cleaners.
3.
Do not use chemicals containing benzene or similar solvents.