Tektronix 7B87 Instruction Manual page 72

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d. CHECK-Change the TRIGGERING SLOPE to (-)
and repeat part c.
e. Set the TRIGGERING MODE to P-P AUTO and
COUPLING to AC.
f. Set the amplifier unit deflection factor for 0.1
volt/division and the low-frequency sine-wave
generator for a 5-division display (500 millivolts) at 50
hertz.
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g. CHECK-For a stable display (TRIG'D light on) at
all settings of the LEVEL control with COUPLING set
to:
1. AC
2. DC
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h. CHECK-Set the SLOPE to (+) and repeat part g.
i. Set the amplifier unit deflection factor for 50
millivolts/division and the low-frequency sine-wave
generator for a 2.5-division display (125 millivolts) at
200 hertz. Set the TIME/DIV switch to 5 ms.
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j. CHECK-Repeat part g for both the (+) and (-)
SLOPE.
k. Disconnect the low-frequency sine-wave generator
from the T connector and connect the medium-
frequency signal generator to the T connector.
I.
Set the TRIGGERING MODE to AUTO and the
SLOPE to
(+).
Set the TIME/DIV switch to 20 ns.
m. Set the amplifier unit deflection factor to 10
millivolts/division and the medium-frequency signal
generator for a 5 division display (50 millivolts) at 50
megahertz.
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n. CHECK-For a stable display (TRIG'D light on) with
the COUPLING switch set to:
1. AC
2. AC LF REJ
3. DC
(Set the TRIGGERING LEVEL control as necessary.)
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o. CHECK-Set the SLOPE switch to (-) and repeat
part n.
p. Set the amplifier unit deflection factor to 50
millivolts/division and set the medium-frequency
signal generator for a 2.5-division display (125
millivolts).
J Performance Requirement check; see introductory information.
@
Performance Check and Adjustment-7B87
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q. CHECK-Set the TRIGGERING MODE to P-P AUTO
and check for a stable display (TRIG'D light on) at all
settings of the LEVEL control with the COUPLING
switch set to:
1. AC
2. DC
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r. CHECK-Set the SLOPE to (+) and repeat part q.
s. Disconnect the medium-frequency sine-wave
generator and T-connector from the left vertical plug-
in unit. Connect the high-frequency signal generator
through the T-connector to the right vertical plug-in
unit.
t. Set the mainframe vertical mode switch to display
the right vertical plug-in unit.
u. Set the high-frequency signal generator for a 7.5-
division display (375 millivolts) at 400 megahertz. Set
the TIME/DIV switch to 10 ns and the MAG switch to
X10.
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v. CHECK-Set the TRIGGERING MODE to P-P AUTO
and check for a stable display (TRIG'D light on) when
the LEVEL control setting is within the ends of the
arrows on the front panel. Repeat for both the (+) and
(-) SLOPE.
w. Set the high-frequency signal generator for a 5-
division display (250 millivolts) at 400 megahertz. Set
the TRIGGERING MODE to AUTO and the SLOPE to
(+).
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x. CHECK-For a stable display (TRIG'D light on) with
the COUPLING switch set to:
1. AC
2. AC LF REJ
3. DC
(Set TRIGGERING LEVEL control as necessary.)
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y. CHECK-Set the SLOPE to (-) and repeat part
x.
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AG. CHECK INTERNAL TRIGGERING
SENSITIVITY
a. Remove all signal connections, then connect the
low-frequency sine-wave generator to the amplifier
unit input.
b. Set the TIME/DIV switch to 20 ms and the MAG
switch to X1.
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