Tektronix 2440 User Manual page 164

Serial number b014064 & below
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Performance Check and Functional Verification Procedure
2440 Service
n.
V E R IF Y -T h a t for settings which are less (more nega­
tive) than approximately 200 mV the display is not
triggered (free-runs).
o.
Set the A Trigger Level Readout for a reading of 0.0 V
and SLOPE to + (positive).
p.
Press A/B TRIG to select the B Trigger System and set
SLOPE to + (positive).
q.
Repeat parts h through o to verify the B Trigger System
as a source for the A *B composite trigger. Do NO T
change the HORIZONTAL MODE to B. Note that the
Trigger Level Readout will Indicate B Trigger Level
settings for parts h through o and that performance of
part j will select the A Trigger System, while part k will
select the B Trigger System.
r.
Disconnect the test setup.
4. Verify the Normal and Single Sequence
Trigger Functions.
a.
Recall the Initial Front-Panel Setup, labeled "FPNL"
(see step i in "INITIAL SETU P" at the start of this
procedure).
Make the following
front-panel setup:
Select: VERTICAL MODE
Set:
CH 2 .........................................
Set:
A S E C /D IV ..............................
b.
Connect the Leveled Sine-wave Generator output to the
CH 1 OR X input connector through a 50 f l Coaxial
Cable.
c.
Set the generator's frequency and amplitude for a
50 kHz, 4-division display.
d.
Select TRIGGER MODE and set NORMAL on.
e.
Using the TRIGGER LEVEL control, VERIFY that the
display can be triggered on the positive going slope of
the AC waveform for the +
SLOPE button and on the negative going slope for the -
(minus) selection of the SLOPE button.
f.
V E R IF Y -T h a t for TRIGGER LEVEL settings outside the
range of the display (approximately ± 2 0 0 mV), the
acquisition stops and the waveform is saved on screen.
g.
Trigger the display and set SINGLE SEQ UEN CE on.
h.
V E R IF Y -T h a t for each press of the STORAGE AC­
QUIRE button, a waveform is acquired and saved
on screen.
i.
Disconnect the test setup.
4-22
changes to the
Off
10 n.s
(plus) selection of the
5. Check Trigger Noise Rejection.
a.
Recall the Initial Front-Panel Setup, labeled "FPNL"
(see step i in "INITIAL S ETU P " at the start of this
procedure).
Make the following
front-panel setup:
Select: VERTICAL MODE
Set:
CH 2
Set:
A S E C /D IV
b.
Connect the sine wave output of the Function Generator
through a 5 0 0
Coaxial Cable to the CH 1 O R X
input connector.
c.
Set the Function Generator's frequency to 50 kHz and
its amplitude for a 4-division display.
d.
Change the CH 1 VOLTS/DIV to 1 V (yields a 0.4-divi-
sion display).
e.
Select
TRIGGER
REJECT on.
f.
CHECK - For a non-triggered, free-running display for
both the + (positive) and - (negative) settings of the
SLOPE button.
g.
Set the A COUPLING menu back to DC on.
h.
Press the A/B TRIG button to select the B Trigger
System (the B COUPLING menu will be displayed) and
set the HORIZONTAL MO DE to B.
i.
Set the B COUPLING menu to NOISE REJECT on.
j.
C H E C K -T h a t the display cannot be stably triggered
with the TRIGGER LEVEL control for either positive or
negative setting of the SLOPE button.
k.
Set the B COUPLING menu to DC on and disconnect
the test setup.
6. Check Slope Selection and Verify Line
Trigger.
a.
Recall the Initial Front-Panel Setup, labeled "FPNL"
(see step i in "INITIAL S ETU P " at the start of this
procedure).
Make the following changes to the
front-panel setup:
Select: VERTICAL M O DE
CH 2
Set:
Select:
CH 1 C OUPLING/INVERT
Set:
50 n ON I OFF
Set:
CH 1 VOLTS/DIV
A SEC /D IV
Select: TRIGGER SOURCE
Set:
LINE
changes to the
Off
10 jis
COUPLING
and
set
Off
OFF
5 V
5 ms
On
NOISE

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