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Model
2001
MAINTENANCE
Repeat the adjustment procedure outlined in paragraph
by connecting the probe to REMOTE Plug, pin 15, and
5.5.6, with the zero supressing probe. However, this time
adjusting MZH, R9 (SIZE), and M2H, R13 (CENT). See
thescope vertical sensitivity t o 1 volt/cm. Instead of the
Figure 5-9.
/
waveform shown in Figure 5-10, the waveform shown in
[
Figure 5-15 should be present.
5.5.8 SWEEP DRIVE ADJUSTMENT - MODULE M2H
+
1 6 V REFERENCE
-16V REFERENCE
Figure 5-15. Sweep Ramp (Probe)
Calibrate the display by connecting the probe to +16
volts, and then to -16 volts. Mark these points on the scope
face or record the exact amplitude of the 16 volt references.
Next, connect the probe to the sweep ramp, REMOTE
plug pin 10, and adjust the M1H CENT and SIZE controls
until the positive and negative peaks agree precisely with
the
+
and -16 volt calibration points. Repeat the calibra-
tion t o check for scope d r i f t while the adjustments were
being made.
.
r ~ e x t , adjust the inverted sweep ramp in the same manner
Connect the scope vertical INPUT (straight connection, do
not use the zero supressing probe) to test point 81 in the
M2H module. See Figure 5-9. Set the Front Panel MODE
switch to a f , SWEEP WIDTH control for minimum and the
CENTER FREQUENCY control t o indicate a dial frequency
-
7/
of 250 MHz on band 1, then adjust MZH, R17 for zero
j
volts at TP1.
Next, adjust the Front Panel SWEEP WIDTH control t o
MAXIMUM sweep width.
Do not move the Front Panel,
CENT FREQ control.
Adjust MZH, R26, for a 28 volt
/
J
-
peak-to-peak signal at test point # l .
-1
Without disturbing the Front Panel ZENT FREQ or SWEEP
WIDTH adjustments return the scope to an X-Y operating
mode with the HORlZ OUTPUT of the sweep generator
driving the scope
X
input. Set the SWEEP TIME to .l-.O1
sec and adjust the SCOPE display width t o 10.4cm (.2cm
overlap on each end). See Figure 5-16a.
cP'5
Connect the scope
Y
input to M2H test poi n ;&whi c h
, $ ,
, ,
i s the top side of any of the *diodes
adjace%"to MZH,
Q7. (Linearity correcting resistors may or may not be con-
nected to the diodes depending on the inherent linearity of
5 '
the sweep oscillator) Adjust M2H, R31, t o position the
7
"knee" approximately 2/3cm t o the left of the 10cm mark,"
as shown in Figure 5-16b. The M2H module cover, and the
left side panel may now be replaced.
Figure
5-16. M2H
Linearity Ref Adj
Model 2001
/irRepeat the adjustment procedure outlined in paragraph
5.5.6, with the zero supressing probe. However, this time
*
set the scope vertical sensitivity to 1 volt/cm. I nstead of the
I
I
waveform shown in Figure 5·10, the waveform shown in
l
Figure 5-15 should be present.
'.",
- ""',-. - - +
16V REFERENCE
-
-
-
-
- -
- . -
. -
- - -16V REFERENCE
Figure 5-15. Sweep Ramp (Probe)
Calibrate the display by connecting the probe to +16
volts, and then to -16 volts. Mark these points on the scope
face or record the exact amplitude of the 16 volt references.
Next, connect the probe to the sweep ramp, REMOTE
plug pin 10, and adjust the M1H CENT and SIZE controls
until the positive and negative peaks agree precisely with
the + and -16 volt calibration points. Repeat the calibra-
tion to check for scope drift while the adjustments were
being made.
foxt.
"'i""
th'
inverted sweep ramp in the same manner
~
~
/
~
I
I
~
/
a
!
--
if-
-)
_.
+- --
I
.--- t--
r-o>
"
-
- j - -
-=1--+
I
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.. J. __ _ _ _
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_L
/
'---. ,
------------------
MAINTENANCE
by connecting the probe to REMOTE Plug, pin 15,
adjusting M2H, R9 (SIZE), and M2H, R13 (CENT),
Figure 5-9.
5.5.8 SWEEP DRIVE ADJUSTMENT - MODULE M2H
and
1
See _
Connect the scope vertical INPUT (straight connection, do
not use the zero supressing probe) to test point #1 in the
M2H module. See Figure 5-9. Set the Front Panel MODE
switch to a
f.
SWEEP WIDTH control for minimum and the
CENTER FREQUENCY control to indicate a dial frequency
of 250 MHz on band 1, then adjust M2H, R 17 for zero
volts at TP 1.
Next, adjust the Front Panel SWEEP WIDTH control to
MAXIMUM sweep width.
Do not move the Front Panel
CENT FREQ control.
Adjust M2H, R26, for a 28 volt
j ,/'
peak-to-peak signal at test point #1.
-
.J
Without disturbing the Front Panel
~ENT
FREQ orSWEEP
WI DTH adjustments return the scope to an X- Y operating
mode with the HORIZ OUTPUT of the sweep generator
driving the scope X input. Set the SWEEP TIME to .1-.01
sec and adjust the SCOPE display width to 10.4cm (.2cm
overlap on each end). See Figure 5-16a.
/--~
f2.)2/~
Connect the scope
Y input to M2H test poin\! #Vwhich
If'1
is the top side of any of
the~diodes adjace~~to
M2H,
. '"
Q7. (Linearity correcting resistors mayor may not be con-
1
nected to the diodes depending on the inherent linearity of
the sweep oscillator).
Adjust M2H, R31, to position the
-7 /
"knee" approximately 2/3cm to the left of the 10cm mark,.-J
as shown in Figure 5-16b. The M2H module cover, and the
left side panel may now be replaced.
~
~
/
~
/
~
b
"'
\
)
"'I
/
~
~
Figure 5-16. M2H Linearity Ref Adj
5-11
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