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DIS pI Sweep
3.7
OSCILLOSCOPE SECTION
sitivity varies continuously over the mlmmum range
from 0.1 volt per division to 10 volts per division. Ad-
just sensitivity with the Vert switch and control.
The time base is calibrated with the vernier control fully
clockwise. Normal operation does not include a char- '-.--/
acter display in either Scope AC or Scope DC mode.
However, if the operator also selects a SWEEP FUNC-
TION, then the first character line on the CRT identifies
the operating center frequency. The synchronized scope
displays the swept response symmetrically about the
selected carrier center frequency. When Scope AC or
Scope DC DISPLAY is selected in conjunction with
sweep function, the oscilloscope horizontal input is
coupled to the sweep signal. When the scope trace is at
the center of the screen
(±
1 minor division) the instan-
taneous RF output frequency will be equal to the pro-
grammed frequency.
NOTE
liOtll
Ell.IHonl
Position
Veri
I~O
M~'
r
OSCILLOSCOPE
KHz
In all cases the bargraph aids the autoranging digital
scale. The bargraph responds in a modified logarithmic
manner that provides a smooth nonranging analog dis-
play. In other words, the analog display will change the
same amount for a 1 volt change at
10
volts as for a 25
volt change at 250 volts.
SPECTRUM ANALYZER USAGE
The indicated rf signal level in the spectrum analyzer mode
is 30db less than actual input at the RF In/Out port.
When using the spectrum analyzer for measuring harmon-
ics of the rf carrier, it is necessary to limit the level of the rf
carrier to less than -20dbm (RF In/Out port) or less than
-50 dbm (Antenna port) with an external attenuator in
order to maintain the correct harmonic relationship to the
rf carrier.
---./
Analog Bargraph
Full Scale Range
0·125w
0-15KHz
0-100KHz
0-100070
0-300V
o
to 100% (Dist)
-60db to Odb (SINAD)
Wattmeter Element
dependent
0-2.5w to l000w
Function
Power Monitor (above 1w)
Frequency Error
FM Modulation
AM Modulation
DVM (AC or DC)
DIST/SINAD
Ext Wattmeter
The horizontal time base generator provides a linear
horizontal sweep from a minimum rate of 100 ms per
division to a maximum rate of 1 us per division in six
decade ranges selectable with the Horizontal control.
Use the oscillator Trigger Level switch in automatic or
normal position to synchronize the horizontal time base
to the vertical input signal. In automatic mode, the
scope will trigger continuously. In normal mode, the
scope will trigger when the vertical signal exceeds the
level set by the control. The smaller trigger level control
adjusts the level at which a positive going signal triggers
the time base. A separate front panel BNC port provides
for the External Horizontal input enabled by a seventh
position on the time base control switch. The input sen-
FIGURE 3-40.
OSCILLOSCOPE SECTION
• SCOPE AC OR SCOPE DC
The Analyzer provides a general purpose 500 KHz oscil-
loscope with calibrated vertical input sensitivities and
automatic or triggered horizontal sweep rates (figure
3-40). Both vertical and horizontal inputs may be
switched between internal and external sources. Use the
scope to analyze waveforms, view modulation signals
(generated internally or externally), detect asymmetric
modulation or audio distortion, trace signals, and
troubleshoot. The vertical input is combined with the
BNC port that also serves as the input for DVM,
Sinad/Dist meter, and Frequency Counter. The Cover's
accessories include probe #RTL-4011A for vertical and
horizontal inputs.
'--/
3-20
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