Cal Test Electronics
Using the Probe
WARNING
At the time of powering on the probe, the input
leads must not be connected to an item to be tested. Never
operate the probe with the case open.
CAUTION
This probe is used to carry out differential mea
-
surements between two points on the circuit under test. This
probe is not designed for electrically insulating the circuit
under test or the measuring instrument.
Getting Started
1.
Connect the BNC output connector to the vertical input of a
general purposed oscilloscope. The oscilloscope must have a
ground referenced.
2.
Connect power adapter.
3.
Select the proper attenuation ratio. When measuring signals
below 3.5 V, switch the attenuation ratio to 1x. For voltages up
to 18 V, set the attenuation ratio to 5x and for voltages up to 35
V set the attenuation ratio to 10x.
4.
The power indicator LED should turn on.
5.
Plug the pincer or alligator clips onto the test leads and connect
the circuit under test.
Vertical Scale on Oscilloscope
The actual vertical scale of the oscilloscope is equal to the attenuation
factor multiplied by the range of vertical scale selected on the
oscilloscope. For example, with the probe on factor 10x and the
oscilloscope on 0.5 V/div, the real vertical scale is 10 x 0.5 = 5 V/
div. With the probe on 5x, the real vertical scale is 5 x 0.5 = 2.5 V/
div. These values apply when the oscilloscope is set to the typical 1
MΩ impedance input. When the scope is set to 50 Ω input, the actual
vertical scale will be doubled: 10 V/div for the 10x setting and 5 V/div
for the 5x setting. See the chart below.
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