Check Position Range; Check Trigger View Gain; Check Bandwidth; Check Bandwidth Limit Operation - Tektronix 2235A Instruction Manual

Performance Check Procedure
-
2235A Instruction
2. Check Positlon Range
a. Set:
VOLTSIDIV (both) 10 mV
Input Coupling (both) AC
b. Set the generator to produce a 0.2-V standard-
amplitude signal.
c. CHECK-The bottom of the waveform can be
positioned at least 1 division above the center hori-
zontal graticule line when the Channel 1 POSITION
control is rotated fully clockwise, and that the top of
the waveform can be positioned one division below
the center horizontal graticule line when the Channel
1 POSITION control is rotated fully counter-
clockwise.
d. Move the cable from the CH 2 input connector to the
CH 1 input connector and set the Vertical MODE
switch to CH 1.
e. Repeat part c using the Channel 1 controls.
3. Check Trigger View Gain
a. Set:
Vertical POSITION (both) Midrange
VOLTSIDIV (both) 0.1 V
VOLTSIDIV Variable (both) CAL detent
b. Press and hold in the TRIG VlEW button, vertically
center the display with the A TRIGGER LWEL
control.
c. CHECK- Display amplitude is 1.6 to 2.4 divisions
while holding in the TRIG VlEW button.
d. Move the cable from the CH 1 input connector to the
CH 2 input connector and set the Vertical MODE
switch to CH 2.
j.
Set the A EXT COUPL switch to
s.
k. Set the generator to produce a 5-V signal.
I.
Repeat parts b and c.
m. Disconnect the test equipment from the instrument.
4. Check Bandwidth
a. Set:
BW Ll M IT Off (button out)
VOLTSIDIV (both) 2 mV
Input Coupling (both) DC
A SECIDIV 20
FS
b. Connect the leveled sine-wave generator output via
a 50-fi precision cable and a 50-fi termination to
the CH 2 input connector.
c. Set the generator to produce a 50-kHz, &division
display.
d. CHECK-Display amplitude is 4.2 divisions or
greater as the generator output frequency is
increased up to the value shown in Table 4-3 for the
corresponding VOLTSIDIV switch setting.
e. Repeat parts c and d for all indicated CH 2 VOLTS1
DIV switch settings, up to the output-voltage upper
limit of the sine-wave generator being used.
f. Move the cable from the CH 2 input connector to the
CH 1 input connector. set the Vertical MODE switch
to CH 1.
g. Repeat parts c and d for all indicated CH 1 VOLTS1
DIV switch settings, up to the output-voltage upper
limit of the sine-wave generator being used.
Table 4-3
Settings for Bandwidth Checks
VOLTSIDIV Generator
Switch Setting
I
Output Frequency
e. Repeat parts b and c. 2 mV
I
90 MHz
f. Move the cable from the CH 2 input connector to the
5 mV 100 MHz
EXT INPUTconnector. Set the A & B SOURCE switch
to A EXT.
5. Check Bandwidth Limit Operation
g. Repeat parts b and c.
a. Set:
h. Set the A EXT COUPL switch to DC.
i. Repeat parts b and c.
BW LIMIT
CH 1 VOLTSIDIV
A SECIDIV
On (button
in)
10 mV
20 FS
REV APR 1990
Scans by AR TEE
MEDLA
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