Tektronix 465B User Manual

Calibration Procedure—465B Service
Adjustment Procedure
17. Check/Adjust CH 1 Volts/Div
Compensation
NOTE
Cl
3010,
in the CH
1
Preamplifier,
is set at the
factory
to
give
C13010, in
the
CH 2 Preamplifier, enough
range to match CH 2 input
capacitance with CH 1
input capacitance. Unless there
is a circuit
malfunc-
tion, the
CH 1 C13010 should not need readjust-
ment. When adjusting either
C13010, or other ad-
justments in this section, if the low-capacity screw-
driver contains
a
metal
bit, the
metal
may
affect
the
adjustment. Check adjustment after the screwdriver
is
remove,
and re-adjust as necessary.
a. Set:
VOLTS/DIV
(both) 5 mV (see note
below)
VERT
MODE CH
1
ATIME/DIV
0.2 ms (see note
below)
20 MHz BW LIMIT
Limited bandwidth
(button in)
NOTE
In steps 17 and
18,
all VOLTS/DIV Checks and
Adjustments require
the
use of a 10X probe with
Scale- Factor Switching (preferably the probe
supplied as a standard accessory with the
os-
cilloscope you are calibrating). If it is necessary to
use a 1 0X
probe without Scale- Factor
Switching, set
the
VOLTS/DIV
knob
to indicate one-tenth of the
setting listed
(5
mV instead of 50 m
V,
etc).
When
adjusting compensation, one adjustment will affect
the waveform front corner, and another will affect
the flat top.
Ignore
the
front
corner when making the
flat
top adjustment and vice-versa. The A TIME/DIV
switch should be
set
to 1
ms for
the
flat-top,
and to
0.2 ms for front corner checks arid adjustments.
b. Connect a 10X probe to CH 1 input connector (note
that
the
VOLTS/DIV Scale-Factor
LED will now indicate
50
mV).
c.
Connect calibration generator high-amplitude
out-
put to tip
of
the 10X probe via a
2X, 5X,
or
10X bnc
attenuator (depending on generator amplitude) and bnc-
to-probe-tip
adapter.
d.
Set
the
calibration generator for a 5-division,
1
kHz
display; add
or remove attenuators or termination as
needed
to maintain a 5-division display
throughout steps
17 and 18.
e.
Adj
ust probe compcnsation
adj ustment for best flat-
top waveform.
Do not re-adjust
probe compensation
throughout the remainder of steps
18
and
19.
f. Set CH 1 VOLTS/DIV
to 0.1 V.
g.
CHECK—Compensation
for all VOLTS/DIV
set-
tings
listed in Table
4-14
for display overshoot, rounding,
and flat-top, is within
2% (5
divisions
±0.1 division). If
compensation setting is within
2%,
skip part h; otherwise
perform part h.
h. ADJUST—
Any adjustment pair
(see Table 4-14) as
necessary
so
compensation
for all settings
of the
VOLTS/DIV switch is within
2%.
18. Adjust
CH 2 Volts/Div Compensation
a. Set:
VERT MODE
CH 2
b. Move the 10X probe connectorfrom
the CH 1 input
to the CH 2 input connector.
c. Adjust calibration generator
for a 5-division, 1 kHz
display;
add or remove attenuators
or termination as
needed
to
maintain
a 5-division display
throughout the
remainder of this step.
d.
CHECK—
Display
for flat-top
waveform within 3%
(±0.15
division).
e.
ADJUST—
C13010 in the CH 2 Preamplifier
for best
flat-top waveform using
a low-capacitance screwdriver.
f.
Repeat
step
17,
parts
f through h for
CH
2.
g.
Disconnect
test setup.
4-34
REV A SEP 1979

Tektronix 465B Specifications

General

Brand	Tektronix
Model	465B
Category	Test Equipment
Language	English