2-
7
Figure 2-4. Alternate Mode connection.
2-11. Resistance Selection
The Tracker 2700 is designed with five resistance ranges (10Ω
ΩΩ
Ω, 100Ω
ΩΩ
Ω, 1kΩ
ΩΩ
Ω, 10kΩ
ΩΩ
Ω, and 100kΩ
ΩΩ
Ω).
A resistance range is selected by pressing the appropriate button on the front panel. It is best to
start with one of the middle resistance values (i.e. 100Ω
ΩΩ
Ω or 1kΩ
ΩΩ
Ω). If the signature on the LCD
display is close to an open (horizontal trace), go to the next higher resistance for a more
descriptive signature. If the signature is close to a short (vertical trace), go the next lower
resistance. An optimum resistive signature is approximately at a 45° angle to the horizontal and
vertical lines of the graticule.
See SigAssist
TM
section (4-5) for help on selecting appropriate resistive parameter.
The SCAN feature will allow for sequencing through the resistance ranges at a speed set by the
RATE selected. This feature allows the user to see the signature of a component in different
resistance ranges while keeping their hands free to hold the test leads.
2-13. Frequency Selection
Five test signal frequencies can be selected by pressing the appropriate button on the front panel.
The upper button just right of the LCD is used to set the test signal frequency.
Press this button until the desired test frequency is displayed on the LCD.
See SigAssist
TM
section (4-5) for help on selecting appropriate frequency parameter.
2-14. Voltage Selection.
The voltage selector buttons (3V/200mV,10V/5V, 20V/15V) allows the user to select the peak
applied sine-wave voltage. Each button has a dual function. For example, pressing the 5V button
(steady LED indication) selects 5 Volts as the test signal’s peak value. Pressing it again
(blinking LED indication) selects 10 Volts as the test signal peak value. See SigAssist
TM
section (4-5) for help on selecting appropriate voltage parameter.
2-15. DC Voltage Source
The built-in DC voltage source of the Tracker 2700 allows in-circuit testing of certain devices in
their active mode. In addition to using the red and black probes, the output of the DC voltage
source is connected to the control input of the device to be tested with the blue clip lead provided.
The DC voltage source has one positive DC output. Figure 2-5 shows how to connect the Tracker
2700 to the device under test, using the DC voltage source.
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