Tektronix CURVE-TRACER 576 Instruction Manual page 147

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k. Set the following Type 576 controls to:
VERTICAL
CENTERLINE VALUE
LEFT-OFF-RIGHT
1 A
10
RIGHT
I. CHECK FOR-Spot vertically centered on the grati-
cule ±2 divisions.
m. Set the VERTICAL switch to 2 A and the CENTER-
LINE VALUE switch to 5.
n. CHECK FOR-Spot vertically centered on the grati-
cule ± 1 division.
o. Set the LEFT-OFF-RIGHT switch to OFF and discon-
nect the 10 A supply and meter from the Type 576.
p. Connect the DC voltmeter between the base jack
(right side) and the GROUND jack on the Standard Test
Fixture.
q. Connect the 25 M$1 resistor between the base jack and
the emitter jack.
r. Set the following Type 576 controls to:
VERTICAL
DISPLAY OFFSET Selector
CENTERLINE VALUE
AMPLITUDE
OFFSET MULT
POLARITY INVERT
MODE
LEFT-OFF-RIGHT
1 nA EMITTER
NORM (OFF)
10
.5V
0.00
Released
LEAKAGE (EMITTER
CURRENT)
RIGHT
s. Turn the OFFSET MUL T control clockwise until the
spot is on the tenth horizontal graticule line. (If the spot
has noise, adjust the center of the elonqaterl spot to the
tenth horizontal graticule line.)
t. CHECK FOR-DC voltmeter reading as shown in
Table 5-10 for the setting of the VERTICAL switch.
u. Repeat parts s and t for the 2 nA and 5 nA positions
of the VERTICAL switch.
v. Exchange the 25 M S1 resistor for a 2.5 M S1 resistor.
®
Performance Check/Calibration-Type 576
TABLE 5-10
Check Accuracy of VERTICAL Switch (Emitter Range)
VERTICAL Switch
Resistor DC Voltmeter
1 nA 25 M$1 0.5
v
±0.075
v
2 nA 1
v
±0.1
v
5nA 2.5
v
±0.175
v
10 nA 2.5 M$1
0.5
v
±0.015
v
20 nA 1
v
±0.025
v
50 nA
2.5
v
±0.055
v
.1 [-LA 250 k$1 0.5
v
±0.01
v
.2 [-LA 1
v
±0.02
v
.5 [-LA
2.5
v
±0.05
v
1 [-LA
25 k$1
0.5
v
±0.01
v
2 [-LA 1
v
±0.02
v
5 [-LA 2.5
v
±0.05
v
w. Set the following Type 576 controls to:
VERTICAL
DISPLAY OFFSET Selector
10 nA
VERTICAL X10
x. Press the ZERO button and position the spot verti-
cally onto the center horizontal graticule line. Release the
ZERO button.
y. Adjust the spot to the center horizontal graticule line
with the OFFSET MU L T control.
z. CHECK FOR-DC voltmeter reading as shown in
Table 5-10 for the setting of the VERTICAL switch.
aa. Repeat parts y and z for all the remaining emitter
current positions of the VERTICAL switch through 5 [-LA.
The resistor must be changed each three positions of the
vertical switch.
ab. Disconnect the DC voltmeter and resistor from the
Type 576.
ac. (If doing check steps only go to step 24.)
Control Settings (Partial List)
INTENSITY
VERTICAL
Type 576
DISPLAY OFFSET Selector
HORIZONTAL
Trace Visible
STEP GEN
HORIZ X10
5 V COLLECTOR
5-19