[25] Note amplitude of each scope
[28] Set horizontal time base of
to TABLE A location using
for both signal point and
ground point
SAFELEED
test lead adapter
third scope to 0.02
µ
s
TABLE A
1
2
3
066-39-018
066-39-0GD
166-33-018
166-34-2GD
166-39-018
166-37-0GD
LOCATION
[29] Connect probe from third scope
[27] Repeat Steps 4 through 13 for
[26] Remove probe from second scope
and connect to channel 1
of third scope
third scope using calibration
scope using calibration source
AND
AND
[22] Remove probe from scope not
channel 2 of selected scope
13 for channel 2 of selected
[23] Repeat Steps 4, Page 1, through
proceeding with
measurements
NOTE 2
signal level changes,
some ground impedance
is suspected and
problem must be
corrected before
It is important that
scope probe ground
lead makes good
contact for
accurately measuring
NCLK signal levels.
This can be confirmed
by observing that
displayed signal
level does not
change when hand is
placed around scope
probe lead. If
CALIBRATE SCOPE
[21] Select one scope to use
[24] Set horizontal time base
on selected scope to 0.02
µ
s
No
Yes
CLOCK CHAIN
0
Probe
Signal
Ground
066-33-018
066-34-2GD
Do amplitudes of
both scopes agree
[20] See NOTE 2.
selected and connect to
DLP
PAGE 3 of 4
234-151-013
529
Issue 8
DEC 1995
