esign ltd
7
GB55-
Peak Atlas DCA
Semiconductor Component Analyser
Model DCA55
User Guide
Peak Electronic Design Limited 2000/2007
©
In the interests of development, information in this guide is subject to change without notice - E&OE
electronic d
Atlas DCA User Guide October 2007 – Rev 7
Want to use it now?
We understand that you want to use your
Atlas DCA
right now. The
unit is ready to go and you should have little need to refer to this user
guide, but please make sure that you do at least take a look at the
notices on page 4!
Contents Page
Introduction....................................................................................3
Important Considerations ...............................................................4
Analysing semiconductors .............................................................5
Diodes......................................................................................7
Diode Networks .......................................................................8
LEDs........................................................................................9
Bicolour LEDs .......................................................................10
Bipolar Junction Transistors (BJTs).......................................11
Enhancement Mode MOSFETs .............................................18
Depletion Mode MOSFETs ...................................................19
Junction FETs (JFETs) ..........................................................20
Thyristors (SCRs) and Triacs.................................................21
Taking care of your
Atlas DCA
....................................................22
Battery replacement ...............................................................22
Self Tests ...............................................................................23
Appendix A - Technical Specifications........................................24
Appendix B - Warranty Information ............................................25
Appendix C - Disposal information .............................................26
Page 2
Atlas DCA User Guide October 2007 – Rev 7
Introduction
Peak Atlas DCA
The
is an intelligent semiconductor analyser that offers great
features together with refreshing simplicity. The
component data to your fingertips.
Summary Features:
•
Automatic component type identification
Bipolar transistors
Darlington transistors
Enhancement Mode MOSFETs
Depletion Mode MOSFETs
Junction FETs
Low power sensitive Triacs
Low power sensitive Thyristors
Light Emitting Diodes
Bicolour LEDs
Diodes
Diode networks
Atlas DCA
brings a world of
•
•
•
•
•
•
•
•
Automatic pinout identification, just connect any way round.
Special feature identification such as diode protection and resistor
shunts.
Gain measurement for bipolar transistors.
Leakage current measurement for bipolar transistors.
Silicon and Germanium detection for bipolar transistors.
Gate threshold measurement for Enhancement Mode MOSFETs.
Semiconductor forward voltage measurement for diodes, LEDs and
transistor Base-Emitter junctions.
Automatic and manual power-off.
Page 3
Atlas DCA User Guide October 2007 – Rev 7
Important Considerations
Please observe the following guidelines:
•
This instrument must NEVER be connected to powered
equipment/components or equipment/components with any
stored energy (e.g. charged capacitors). Failure to comply
with this warning may result in personal injury, damage to
the equipment under test, damage to the
Atlas DCA
and
invalidation of the manufacturer’s warranty.
•
The
Atlas DCA
is designed to analyse semiconductors that
are not in-circuit, otherwise complex circuit effects will
result in erroneous measurements.
•
Avoid rough treatment or hard knocks.
•
This unit is not waterproof.
•
Only use a good quality Alkaline battery.
Page 4
Atlas DCA User Guide October 2007 – Rev 7
Analysing Components
Atlas DCA
The
unconnected, unpowered components. This
ensures that external connections don’t influence
the measured parameters. The three test probes can be
connected to the component any way round. If the component has
only two terminals, then any pair of the three test probes can be used.
is designed to analyse discrete,
The
Peak Atlas DCA
is analysing....
Depending on the component type, analysis may take a few seconds to
complete, after which, the results of the analysis are displayed. Information is
displayed a “page” at a time, each page can be displayed by briefly pressing the
scroll-off
The arrow symbol on the display indicates that more pages are available
to be viewed.
button.
Although the
can manually switch the unit off by holding down the
Atlas DCA
will switch itself off if left unattended, you
analysis when the
pressed.
Atlas DCA
will start component
on-test
button is
scroll-off
button for a couple of seconds.
Page 5
Atlas DCA User Guide October 2007 – Rev 7
If the
component between any of the test
probes, the following message will be
displayed:
If the component is not a supported
component type, a faulty component or
a component that is being tested incircuit, the analysis may result in the
following message being displayed:
Some components may be faulty due to
a shorted junction between a pair of the
probes. If this is the case, the following
message (or similar) will be displayed:
Atlas DCA
cannot detect any
No component
detected
Unknown/Faulty
component
Short circuit on
Green Blue
If all three probes are shorted (or very
low resistance) then the following
message will be displayed:
It is possible that the
junctions or other component type within an unknown or faulty part.
This is because many semiconductors comprise of PN (diode)
junctions. Please refer to the section on diodes and diode networks for
more information.
Atlas DCA
Short circuit on
Red Green Blue
may detect one or more diode
Page 6
Atlas DCA User Guide October 2007 – Rev 7
Diodes
Atlas DCA
The
diode. Any pair of the three test clips can be
connected to the diode, any way round. If the
unit detects a single diode, the following
message will be displayed:
will analyse almost any type of
Diode or diode
junction(s)
RED GREEN BLUE
Anod Cath
Forward voltage
Vf=0.67V
Test current
If=4.62mA
Pressing the
button will then display the pinout for
the diode. In this example, the Anode of
the diode is connected to the Red test
clip and the Cathode is connected to the
Green test clip, additionally, the Blue
test clip is unconnected. The forward
voltage drop is then displayed, this gives
an indication of the diode technology. In
this example, it is likely that the diode is
a silicon diode. A germanium or
Schottky diode may yield a forward
voltage of about 0.25V. The current at
which the diode was tested is also
displayed.
scroll-off
Note that the
are connected in series when the third test clip is not connected to the
junction between the diodes. The forward voltage drop displayed
however will be the voltage across the whole series combination.
The
if the measured forward voltage drop exceeds 1.50V. Please refer to
the section on LED analysis for more information.
Atlas DCA
Atlas DCA
will detect only one diode even if two diodes
will determine that the diode(s) under test is an LED
Page 7
Atlas DCA User Guide October 2007 – Rev 7
Diode Networks
The
three terminal diode networks. For three terminal devices
such as SOT-23 diode networks, the three test clips must all
be connected, any way round. The instrument will identify the type of diode
network and then display information regarding each detected diode in
sequence. The following types of diode networks are automatically recognised
by the
Atlas DCA
Atlas DCA
will intelligently identify popular types of
:
Common cathode
diode network
Common anode
diode network
Series
Both cathodes connected
together, such as the BAV70
device.
Anodes of each diode are
connected together, the
BAW56W is an example.
Here, each diode is connected
in series. An example is the
diode network
Following the component identification,
the details of each diode in the network
will be displayed.
Firstly, the pinout for the diode is
displayed, followed by the electrical
information, forward voltage drop and
the current at which the diode was
tested. The value of the test current
depends on the measured forward
voltage drop of the diode.
Following the display of all the details for the first diode, the details of the
second diode will then be displayed.
BAV99.
Pinout for D1...
RED GREEN BLUE
Cath Anod
Forward voltage
D1 Vf=0.64V
Page 8
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