Section 2 Operating Instructions; Introduction; About The Tracking Generator; Function Of The Front Panel Controls And Connectors - Tektronix TR 502 Instruction Manual

Introduction
VAR dB : This control provides continuous output level
This section describes the function of the front panel
adjustment over a range of 2 dB ; itaffects both the RF OUT
controls and connectors, installation of the TR 502 into
and AUX RF OUT levels .
the TM 500-Series mainframe, interface connections to
the spectrum analyzer and frequency counter, ad-
DOT INTENSITY: This control sets the brightness of the
justmentsrequiredtocalibratetheTR 502 to the spectrum
displayed frequency indicating dot when the TR 502 is
analyzer, and how to use the tracking generator.
used with a DC 502 Option 7, or equivalent frequency
counter, and the TR 502/7L13 Spectrum Analyzer is
operating in the sweep stop mode .
About the Tracking Generator
The TR 502 Tracking Generator is a two wide plug-in
unit for the TM 500-Series (Option 7) Power Modules . It
operates with the 7L13 or 7L12 Spectrum Analyzer to
provide a constant, level-calibrated rf signal source, that
precisely tracks the spectrum analyzer input frequency
from 100 kHz to 1 .8 GHz. Signal output level is calibrated
and adjustable from 0 dBm to -59 dBm in 1 dB steps. The
Spectrum Analyzer/Tracking Generator system can be
used to display frequency response of carious devices
such as filters, amplifiers, etc . that are connected between
the tracking generator RF OUTput and the spectrum
analyzer rf input connector.
When the TR 502 is installed in a modified three-wide or
AUX RF OUT: A source of the output signal for auxiliary
larger, power module, a frequency counter such as the
test equipment such as a frequency counter. This
DC 502 can be connected to the AUX OUT and used to
output connector must be terminated in a 50 S2 load to
accurately measurethefrequencyforanyfixedpositionof
maintain flatness .
span . When the analyzer is in the non-sweep mode, the
TR 502 output is a cw signal and the counter reads
continuously . If a DC 502 Option 7, or similar counter is
INPUT CONNECTORS :
used, the TRACKING GEN LOGIC is interfaced with the
7L13 Spectrum Analyzer so operational logic from the
1st LO IN and 2nd LO IN : These interface to the
TR 502 controls the sweep function of the spectrum
spectrum analyzer 1 st LO and 2nd LO Output connec
analyzer and the frequency counting of the counter. A dot
tors .
i s displayed at sweep center to indicate where and when
the frequency count is taken .
TRACK GEN LOGIC: Interfaces operational logic
between the tracking generator and the spectrum
The TR 502 is installed in the TM 500-Series mainframe
analyzer to operate the system with a compatible
by aligning the upper and lower guide rails with the plug-in
frequency counter.
compartment tracks and pushing the TR 502 into the
compartment until the front panel is flush with the
mainframe front panel . To remove, pull the release latch to
disengage the locking mechanism and pull t(~e unit out.
Operational Check and Calibration
See Fig . 1-2. The TR 502 plugs into and receives its power from a
TM 500-Series mainframe. It operates with the 7L13 or
7L12 Spectrum Analyzer . The 1st and 2nd LO signal from
Function of the Front Panel Controls and
the spectrum analyzer are applied, via coaxial cables, to
Connectors
the 1st and 2nd LO INput connectors for the TR 502 . If the
The following is a description of the controls and
TR 502/7L13 system is used with a DC 502 Option 7
connectors on the TR 502:
Digital Counter, a third cable interfaces between the
TR 502 and 7L13 Spectrum Analyzer to supply the
OUTPUT LEVEL: Selects 0 dB to 59 dB of attenuation in 1
necessary logic data for the various counter and spectrum
dB steps of the calibrated output signal to the RF OUT ; it analyzer operating modes. This interface cable is used
has no effect on the output level of the AUX RF OUT .
when a counter is part of the system .
REV . A, MAY, 1978
OPERATING
INSTRUCTIONS
Section 2-TR 502
TRACK ADJUST : Adjusts the frequency offset between
the TR 502 Tracking Generator output signal and the
tuned input frequency of the spectrum analyzer .
OUTPUT CONNECTORS :
RF OUT: A 0 dBm to -61 dB, 50 S2, signal source with a
frequency, that tracks the spectrum analyzer . Output
level depends on the setting of OUTPUT LEVEL and
VAR dB controls .
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