Tektronix 1L30, Instruction Manual

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Operating Instructions— Type tL30
in the 0 position, the analyzer functions as
a fixed tuned receiver. This provides a
display that shows the time domain char­
acteristics of modulation within the resol­
ution bandwidth, capabilities of the an­
alyzer.
COUPLED Selects the analyzer resolution bandwidth.
RESOLUTION -Eleven selectable ranges, from more than
10 kHz to less than 1 kHz are provided.
The normal resolution for a given disper­
sion is generally obtained with the RE­
SOLUTION control coupled to the DIS­
PERSION selector.
DISP CAL
DISP BAL
IF ATTEN dB
G A IN
IF CENTER
FREQ
FINE
CAL
VIDEO FILTER
VERTICAL
DISPLAY
A screwdriver adjustment to calibrate the
M Hz/cm dispersion.
Adjusted to balance the dispersion center
(center frequency point) of the M H z /C M
and kH z/C M position of the DISPERSION
RANGE switch.
Series of six toggle switches to provide
calibrated IF attenuation in 1 dB steps,
from 1 dB to 51 dB.
A variable control of the analyzer IF gain,
plus a variable control over the video IN ­
PUT signal amplitude.
A 10 turn control that shifts the IF center
frequency. Provides a ± 1 0 M Hz adjust­
ment in the 10 M Hz/cm dispersion posi­
tions, a ± 2 5 M Hz adjustment of the cen­
ter frequency, through the 5 M H z/cm to
0.2 M Hz/cm positions, and a . ± 2 . 5 MHz
adjustment through the 500kH z/cm to 1 '
kHz/cm DISPERSION positions.
A one turn control, that operates in con­
junction with the IF CENTER FREQ control,
to provide a fine adjustment of the IF cen­
ter frequency. Provides ± 1 MHz adjust-
menl for the .2 M Hz/cm through the 10
M Hz/cm dispersion positions and the ± 5 0
kHz for the 1 kHz/cm through the 500 kHz/
cm DISPERSION positions.
With the IF CENTER FREQ control center­
ed, it calibrates the IF center frequency
to 200 MHz.
With the switch in the up position the
video bandwidth is restricted to reduce
high frequency video components such as
noise, from distorting the display and en­
ables easier evaluation of signal modula­
tion when viewing signals near minimum
resolution.
Selects logarithmic, linear or square law
display for the frequency domain displays,
and VIDEO for a time domain display. In
the LOG position, signal display amplitude
is logarithmic, with a dynamic range >
40 dB. In the LIN position, a signal display
amplitude is linear with a dynamic range
> 2 6 dB. In the S.Q LAW position signal
amplitude is a square law function or the
display amplitude is a function of signal
power. The SQ LAW dynamic range is
> 1 3 dB.
The VIDEO position connects the INPUT
connector to the veitical amplifier of the
plug-in oscilloscope.
RF CENTER Tunes the RF center frequency from 925
FREQ M Hz to 10,500 MHz. With the IF CENTER
FREQ Control in the 0 position, the RF
CENTER FREQ dial indicates the center
frequency of the display.
FINE RF CEN- A fine adjustment of the RF local oscil-
TER FREQ lator frequency. Especially useful in tuning
the oscillator to a phase lock condition
with the reference frequency.
MIXER A control used to optimize the conversion
PEAKING action of the first mixer. The control is
adjusted to optimize mixer conversion
for any fixed center frequency setting.
This must be done for each dispersion
window.
LOCK CHECK A pushbutton switch that applies the phase
lock output beat signal (between the local
oscillator and reference frequency) plus
the DC reference level of the phase lock
amplifier and an indication of the signal
location to the vertical display system. Pro­
vides a visual indication to the operator
of phase lock operation.
INT 1 M Hz REF Selects either the Internal 1 MHz Refer-
FREQ ence Frequency or an externally applied
reference frequency.
1 MHz CAL A BNC connector that provides 1 MHz
MARKERS OUT marker signals from the Internal oscillator,
. OR EXT REF when the switch is in the INT 1 MHz REF
FREQ IN FREQ positions. These markers can be
used to calibrate the dispersion. W ith the
INT 1 M Hz REF FREQ switch in the OFF
OR EXT position, an external signal be­
tween 1 M Hz and 5 M Hz (1 to '5 V peak
to peak) may be applied to the connector.
This external signal will then become the
reference frequency for phase lock opera­
tion.
RF INPUT Coaxial connector (N type) which connects
through a coaxial cable, to the signal
source. Input impedance 50 Q.
TO RECORDER Signals on the display may be recorded by
plugging into the TO RECORDER output.
Provides a linear output, equal to or great­
er than 2 mV per displayed centimeter of
signal amplitude, in the LIN mode, into a
source impedance of 600 ohms.
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