FIGURE 1
--r
"~
10V
0
(J
-±-
"---'"
I~
T
.1
The following table shows the integrated circuit pin numbers
to probe with the ocilloscope
to
observe these sinewaves:
TABLE
2:
AL
I
AS
F I L TER OUTPUTS
U20
PIN
2
CHANNEL
1
U21
PIN
2
CHANNEL
2
U22
PIN
2
CHANNEL
3
U23
PIN
2
CHANNEL
4
U24
PIN
2
CHANNEL
5
U25
PIN
2
CHANNEL
6
U26
PIN
2
CHANNEL
7
U27
PIN
2
CHANNEL
8
U28
PIN
2
CHANNEL
9
U29
PIN
2
CHANNEL
10
U30
PIN
2
CHANNEL
11
U3l
PIN
2
CHANNEL
12
The following, Table
3,
shows the Sample D/A Converter test
pOints to probe if any of the Channel Alias Filter outputs are
incorrect. The sinewaves at these points are not as clean
in
appearance.
Note: Be sure
to
use the
C2
sinewave at 5kHz sampling rate.
If a sample"
DAC
output
is
bad,
refer to the CGP procedure.
Kurzwell 250 Service Manual, Chapter 4
4·27
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