•
•
•
Vertical System
Checks
Performance Tests
These procedures check those characteristics that relate to the vertical
system and are listed
as
checked under Warranted Characteristics
in
Section
1,
Specifications.
Check
DC
Gain and Voltage Measurement Accuracy
Equipment Required: One pulse generator (item
10)
and one precision
coaxial cable (item
5).
1.
Display the channel to be verified, turning all others
off.
2.
Press the AUTOSET button.
3.
Set the sec/div scale to 500 Ils.
4.
Press the TRIGGER MENU button and set CPLG to
Noise
Reject.
5.
Press the CURSOR button and set AVoit to On.
6.
Press the VERTICAL MENU button and make the following selections:
•
Set CPLG to DC
• Set
BW
to 20 MHz
7.
Set the volts/div scale to 2
mV.
8.
Position the trace three divisions below the center horizontal graticule
line
.
9.
Connect the standard amplitude output of the pulse generator to the
input of the
channel to be verified
as
shown
in
Figure 4-6.
p
ulse Generator
=-ODD
DO
0
0
~'O
'0'
10
0
0
• 0
10
to
0
10
El
·0
@
0
00
0
0
00
0
..
_ 0
0
•
=C
OO~
'-" '-"
'-"
'-"
~~
~b~=~=~
Precision Cable
~
Figure 4-6: Gain and Voltage Test Setup
10. Set the pulse generator for 10
mV
amplitude output.
11. Use the
General Purpose Knob and TOGGLE button to precisely align
the cursors to the signal peaks.
12. Check the
Displayed Signal Accuracy and Volts Readout Accuracy while
setting the
Volts/Div Scale and the Input Amplitude given
in
Table 4-2 .
TAS 475 and TAS 485 Service Manual
4-15
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