Tektronix CURVE-TRACER 576 Instruction Manual page 187

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k. Set the following Type 576 controls as listed:
VERTICAL
CURRENT LIMIT
OFFSET
10 mA COLLECTOR
2A
OPPOSE
I. CHECK FOR-Highest spot of the display between
0.5 and 2 divisions above the center horizontal graticule
line (between 5 mA and 20 mA).
TABLE 2-9
Check Short Circuit Current Limit
CURRENT LIMIT
VERTICAL
2A
2A
500mA
.5A
100mA
.1 A
20mA
20 mA
5. Check Pulsed Step Width
a. Set the following Type 576 controls as listed:
NUMBER OF STEPS
OFFSET
PULSED STEPS
LEFT-OFF-RIGHT
1
ZERO
300 JlS
OFF
b. Disconnect the patch cord from the Standard Test
Fixture. Connect the BNC-to-dual binding post adapter to
channel 1 of the test oscilloscope. Connect the+ input (red
binding post) through a patch cord to the base jack (right
side) of the Standard Test Fixture and the ground input to
the emitter jack.
NOTE
If the display exhibits noise, shorter patch cords and
a shielded cable between the BNC-to-dual binding
post adapter and the test oscilloscope may be
required.
c. Set the test oscilloscope controls as shown in the I ist
of Initial Control Settings at the beginning of the proce-
dure.
d. Set the LEFT-OFF-RIGHT switch to RIGHT and
trigger the test oscilloscope on the positive edge of the
pulsed step.
ADD AUG 1984
Performance Check-Type 576
e. CHECK FOR-Pulse width of 300 Jls +5%, -15%.
f. Press the 80 JlS PULSED STEPS button and set the
test oscilloscope Time/div switch to 20 JlS.
g. CHECK FOR-Pulse width of 80 JlS +20%, -5%.
6. Check Step Generator Ripple
a. Set the following Type 576 controls to:
DISPLAY OFFSET Selector
CENTERLINE VALUE
HORIZONTAL
AMPLITUDE
OFFSET
OFFSET MULT
STEPS
STEP FAMILY
POLARITY
LEFT-OFF-RIGHT
HORIZ X10
10
.05 BASE
.05 J1A
AID
0.00
Pressed
SINGLE
+(NPN)
OFF
b. Disconnect the Type 576 from the test oscilloscope.
c. Connect a 10 Mn, 1/4 watt, 5% resistor between the
base and emitter jacks (right) of the Standard Test Fixture.
Set the LEFT-OFF-RIGHT switch to RIGHT.
d. Press the ZERO button and position the spot to the
horizontal center of the CRT graticule.
e. Turn the OFFSET MUL T control clockwise until a
spot appears on the CRT.
f. CHECK FOR-Spot with a horizontal width of less
than 2 divisions (less than 1 nA peak to peak).
g. Set the following Type 576 controls to:
AMPLITUDE
OFFSET MULT
LEFT -OFF-RIGHT
.05
v
10.00
OFF
h. CHECK FOR-Spot with horizontal width of less
than 0.2 division (less than 2 mV peak to peak).
This concludes the Supplementary Performance Check
Procedure.
A-29