Tracker-2800-2800S.pdf - 第23页
23 2-12 Scanning with a Tracke r 2800S The Tracker 2800S is a scannin g version of the Tracker 2800. It can automaticall y scan and compare up to 40 pins using standard IDC connections on the front panel. Comm on uses fo…
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2-11 DC Voltage Source
The built-in DC voltage source of the Tracker 2800 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 2-12 shows how to connect the Tracker to the
device under test (a SCR is used in this example) using the DC voltage source.
Figure 2-12. Tracker 2800 DC Source Typical Setup
The DC Voltage Source output is set using the DC Level controls (indicated by arrows) on the LCD
touch screen. While in the power-up menu, press the DC button then use the and arrow buttons to
increase or decrease the output voltage. The voltage level will be displayed at the top of the display.
The level control varies the magnitude of output amplitude from zero to + 10 volts. Press the DC
button to return to the power-up menu.
The DC Voltage Source can be used to test gated devices such as SCRs, TRIACS, optocouplers and
relays. It can also be used “bias test” transistors by applying voltage to the base while monitoring the
collector-emitter signature with the Tracker. This test method works similar to the basic functions of a
curve tracer.
CAUTION
The device to be tested must have all power turned off and all high voltage capacitors discharged
before connecting the Tracker to the device. Failure to do so may cause damage to the Tracker and
void the warranty.
DC Level
controls
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2-12 Scanning with a Tracker 2800S
The Tracker 2800S is a scanning version of the Tracker 2800. It can automatically scan and compare
up to 40 pins using standard IDC connections on the front panel. Common uses for scanning include
connecting to PCB connectors and IC clips using custom ribbon cables.
Figure 2-13 shows a typical Tracker 2800S configuration using standard DIP clips attached to through-
hole ICs.
Figure 2-13. Typical 2800S setup with DIP clips
Using the scanning capabilities of the Tracker 2800S is very easy. It is possible to scan using one
channel or both and also make signature comparisons between channel A and channel B.
To scan a component using the front panel cable interface, the package type and number of pins must
first be configured (the Tracker 2800S default configuration is a 16 pin DIP package). Using IC clips
and cables as an example, connect an IC cable and clip from each Tracker channel to ICs on side-by
side boards. Connect a Common lead to a common connection such as ground on each board.
Press the Menu front panel button to display the Main menu (first image in figure 2-14). Select SCAN
from the touch screen Main menu to display the SCAN menu (second image in figure 2-14). Select
PACKAGE from the SCAN menu to display the PACKAGE menu (third image in figure 2-14). Select
PACKAGE to display the PACKAGE select menu (middle right image in figure 2-14). Use the and
buttons to step up or down through the package choices of DIP, SIP, BOTH or FRONT. Press the
PACKAGE button to return to the Package menu. Press the PINS button to display the PIN select
menu (top right image in figure 2-14). Use the and buttons to increase or decrease the numbers of
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pins to be scanned. Press the PINS button to return to the PACKAGE menu. Press the SINGLE button
to toggle (bottom right image in figure 2-14) between SINGLE (single pass then stop), LOOP
(continuous scan) or STOP (stop on failure).
Figure 2-14. Scan/Package menus
Press the MENU button until the power-up menu is reached (the signature will become live). The pins
can be manually scanned by pressing the PIN button on the LCD. Make sure you have a Common
connection to the PCBs being tested otherwise you will see only open circuit signatures (horizontal
lines) on the Tracker display. The display will change to show the current pin number at the top. Press
the and arrow buttons to step manually through the pins on the connected device with the
signature for each pin will be displayed on the LCD. Press A to view only channel A, B to view only
channel B or press the ALT button to view signatures on channel A and channel B. Comparison of the
A (green signature) and B (red signature) channels is automatic when the Tracker is in ALT mode.
Note the green “check” or red “X” mark on the bottom right portion of the LCD will indicate a passed
or failed comparison.
To scan without having to increment the and arrow buttons on the PIN menu, press the front panel
SCAN button and the 2800S will step through the pins automatically. Press the SCAN button again to
stop the scanning. By default, selecting the SCAN button will test each pin in each 2800S resistance
range before stepping to the next pin. To change which range parameter is scanned, press the front
panel MENU button to display the Main menu (left image in figure 2-15) on the LCD. Press the
SCAN button on the LCD to display the SCAN menu (middle image in figure 2-15) and press the
MODE button on the LCD to display the MODE menu (right image in figure 2-15). Use the and
arrow buttons to change the scan mode between resistance (RES), frequency (FREQ), none (NONE)
and voltage (VOLT).
Press SCAN Press PACKAGE Configure Package