Dual Range Tester – R18
Initial Setup
The following steps allow the easy first use of the DRT.
1.
Connect the two BNC – BNC cables to the DRT and then connect the one marked X to CH 1 or X
on your oscilloscope, and the one marked Y to CH 2 or Y on the ‘scope.
2.
Connect the power pack barrel jack to the matching socket on the DRT. Ensure the DRT on/off
switch is in the off position and then plug in the power pack to a suitable 110 Volt wall socket.
a.
Note the power pack supplied is only suitable for 110 Volt AC supplies.
3.
Connect the test lead set to the corresponding banana jacks on the DRT. While polarity does not
matter, connecting red to red and black to black just seems right.
4.
Connect your oscilloscope in XY mode. Please refer to your user manual for the correct settings
for your ‘scope.
a.
We are unable to provide advice on the settings your specific oscilloscope requires.
5.
With the range switch set to either the High or Low position; switch on the DRT by moving the
on/off switch to the ‘on’ position. A horizontal straight line trace should appear on the ‘scope.
Adjust the ‘scope controls to achieve the correct intensity and position of the line, which is best
centered on screen. Adjust the Volts/Div. control to make the line about 4 grid units wide
a.
If the line appears as vertical, swap the X Y BNC cables.
6.
With the unit setup and power applied test initial operation by shorting the red and black test
leads together, the horizontal line on the scope should become a vertical line, and revert back to
a horizontal line when the leads are no longer shorted.
This concludes the initial set up.
Basic Operation
After setup the DRT can be put to work. Components to be tested are connected to the test leads and
the display on the scope will change to reveal various patterns that indicate operation, these patterns
will become well known after using the DRT for a little while. Some patterns are standard across devices
and some vary even within the same device.
For instance silicon diodes and small signal diodes tend to all have a similar pattern shape, with some
variation occurring from device to device in the length of the waveform shape arms. When connecting
the DRT to a transformer though the patterns achieved can vary depending on the winding tested, or
the portion of the winding. This is when use of the low or high current switch becomes an important
tool.
Another example is illustrated below, where different pattern shapes is achieved with the same
component depending on the setting of the High/Low switch.
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