Tektronix 7B10 Instruction Manual page 67

Calibration Part
II—
7B10
Adjustment and Performance Check
PART
II—
ADJUSTMENT AND PERFORMANCE CHECK
The
following
procedure
(Part
II
—
Adjustment and Performance Check)
provides the information
necessary
to:
(1
)
verify
that
the instrument
meets
the
electrical specifications,
(2)
verify that
all
controls function properly,
and
(3)
perform
all
internal
adjustments.
Part
I
—
Performance Check
verifies electrical
specifications without
removing instrument covers
or
making
internal
adjustments.
All
tolerances given are as
specified
in
the Specification tables (section
1)
in this
manual.
A
separate Operators
Checkout Procedure
is
provided
in
the Operators
Manual
for familiarization
with the instrument
and
also
to verify
that
all
controls
and connectors
function properly.
See
Preliminary Information,
at
the beginning
of this section, for
further information.
ADJUSTMENT
AND
PERFORMANCE
CHECK PROCEDURE
INDEX
PAGE
A.
TRIGGERING
SYSTEM 5-17
1.
Check
External Trigger Input
Resistance
5-17
2.
Adjust
External Trigger
Compensation
(Cl 17)
5-18
3.
Adjust Sensitivity
(R147)
5-18
4.
Check
Triggering
Modes
5-18
5.
Check
External Level
Range 5-19
6.
Check External Triggering
Sensitivity
5-19
7.
Check
Internal
Triggering Sensitivity
5-20
8.
Check
Internal
Trigger
Jitter
5-21
9.
Check Line Triggering
5-21
B,
HORIZONTAL SYSTEM
5-22
1.
Set Basic
Sweep
Calibration
5-22
2.
Check
Sweep
Length
and
Positioning
Range 5-23
3.
Check/ Adjust Magnifier
Gain and
Registration
(R460,
R470) 5-23
4.
Check
Variable
Time
Division
and
Variable
Hold
Off
5-23
5 Adjust
Sweep
Timing
(C361,
R305,
R310, R480) 5-24
6.
Check
Sweep
Timing 5-24
7.
Check
Magnified
Sweep
Timing 5-25
ADJUSTMENT
AND PERFORMANCE
CHECK POWER-UP SEOUENCE
NOTE
The performance
of
this
instrument can be
checked
to
any ambient
temperature from
0°
to
+50°
C
unless
otherwise
stated.
Adjustments
must
be
performed
at
an
ambient temperature
between +20° and +30°
C
for
specified accuracies.
1.
Install
a
high
impedance
amplifier unit
in
the
left
vertical
compartment
of
the oscilloscope
mainframe.
2.
Install
the
7B10
in
the
B
horizontal
compartment
of
the
mainframe.
3.
Set the
mainframe
vertical
mode
switch
to
display the
left
vertical
unit
and
the horizontal
mode
switch
to
display
the B
horizontal unit.
Set the
mainframe
intensity
controls
fully
counterclockwise
and
set
the
trigger
source
switches
to vertical
mode.
4.
Turn on the
mainframe and
allow
at least
20 minutes
warmup
before beginning the procedure.
5-16