Equipment information

Tektronix 7L13 Spectrum analyzer
Model 7L13
Date 1974
Category Measurement instruments
Group Spectrum analyzer
                                    The 7L13 Spectrum Analyzer is a high-performance
communication spectrum Analyzer that plugs into and operates
with the 7000-Series mainframe oscilloscopes. It is a swept
front end Analyzer that displays absolute amplitude
information of signals within the frequency span of 0 Hz to
1.8 GHz. Time domain characteristics, within a 3 MHz
bandpass, can also be displayed.
Important features of the 7L13 are: 1) Greater than 70 dB
dynamic range. 2) Sensitivity down to —128 dBm.
3) Resolution capability from 3 MHz to 30 Hz.
4) Incidental FM’ing less than 10 Hz. 5) Fully calibrated
display modes of either 10 dB/Div, 2 dB/Div, or Linear; and
a calibrated reference level in dBm. 6) Calibrated sweep
spans from 100 MHz/Div to 200 Hz/Div. 7) Digital frequency
readout. 8) Full range of video filtering for noise
averaging. 9) Baseline clipping to subdue the bright
baseline of displays when photographing. 10) Pulse
stretching, to enhance pulsed Spectra when using wide
frequency spans and resolution bandwidths. 11) Access for a
tracking Generator. 12) Frequency and amplitude reference
If the 7000-Series mainframe features crt readout, the
signal parameters and other pertinent information, such as
resolution bandwidth, video filtering, and frequency span,
are displayed on the crt readout to simplify the operation
of the instrument. Records can then be made of pertinent
data by photographing the display.

The Analyzer requires three Plug-In widths in the 7000-
Series mainframe.
The following characteristics and features of the 7L13
Spectrum Analyzer are applicable after a warmup period of 30
minutes or more.
Range: 1 kHz to 1.8 GHz.
Resolution of the Center Frequency Indicator: Within
1 MHz.
Accuracy: ±(5 MHz + 20% of the Freq Span/Div).
The center frequency is indicated by LED readout on the 7L13
and crt readout when the 7000-Series mainframe has this feature.
Calibrated spans from 200 Hz/Div to 100 MHz/Div in a
1-2-5 sequence, plusO Hz and MAX SPAN positions. In the
0 Hz position, the Analyzer is a fixed tuned receiver for
time domain analysis. In the MAX SPAN position the frequency
span is approximately 1.8 GHz.
Accuracy: Within 5% of the indicated frequency separation.
Linearity over the center 8 divisions is within 5%.
Six resolution bandwidth selections from 30 Hz to 3 MHz, in
decade steps, are provided. Resolution bandwidth may be
coupled or uncoupled from the frequency span selector.
Bandwidth accuracy: Resolution bandwidth, at the 6 dB down
point, is within 20% of the resolution selected.
Shape factor (60:6 dB ratio): 12:1 or better for 30 Hz
resolution and 4:1 or better with resolution of 300 Hz or
more except 3 MHz. Maximum bandwidth 60 dB down with 3 MHz
resolution, is 13 MHz.
Signal level change over the six resolution bandwidth
selections is less than 0.5 dB.
STABLITY (after a 2 hour warmup period)
Within 2 kHz per hour at a fixed temperature, when x phase
locked: within 50 kHz when not phase locked.
INCIDENTAL FM (see Fig. 3-5)
10 Hz (peak-to-peak) or less when phase locked, and 10 kHz
(peak-to-peak) or less for 5 seconds when out of phase
locked mode.
Three selections of video filtering; 10 Hz, 300 Hz and 30
kHz are provided for signal or noise averaging.
LOG 10 dB/DIV: Provides a calibrated 70 dB dynamic range
with an accuracy that is within 0.1 dB/1 dB to a maximum of
1.5 dB over the full dynamic range.
LOG 2 dB/DIV: Provides a calibrated 14 dB dynamic range with
an accuracy that is within ±0.4 dB/2 dB to a maximum of 1.0
dB over the 14 dB dynamic range.
LIN: Provides a linear display from approximately
0.7/iV (100 dBm) full scale, to 7.07 volts (+30 dBm).
Amplitude linearity is within 10% over the graticule height.
Reference level operation is in calibrated 10 dB steps from
-110 dBm to +30 dBm, within ±2 dB. (Accuracy includes the
attenuator and gain switching effects when the two are not
offsetting each other.) Reference level operation below 100
kHz becomes limited to a range from +30 dBm to-50 dBm as the
center frequency approaches
1 kHz.
Reference level deviation, between display modes, is less
than 2 dB from 2 dB/DIV to 10 dB/DIV and less than
0.5 divisions from 2 dB/DIV to LIN. This deviation is a
function of the Oscilloscope vertical linearity.
An UNCAL indicator signifies when the display is not calibrated.
+1 dB, —2 dB with respect to the level at 50 MHz, over any
selected frequency span.

These manuals are available for the above equipment:

Manual Type Service and User Manual Tektronix-8424-Manual-Page-1-Picture
Pages 248
Size 54.20 Mbytes (56832819 Bytes)
Language english
Revision First Prining
Manual-ID/Number 070-1673-00
Date 01 April 1974
Quality Scanned document, reading partly badly, partly not readable.
Upload date
MD5 366938761568428ebde8e5b59225ed5e
Downloads 195 since 15 January 2017
on ANSI Y 1.1,1972Standards.This manual isdivided into ten
major sections that provide the following information:
Section 1 — General Information and Specifications: Contains
the instrument description and specifications.
Section 2 — Operation Instructions: Information relative to
installing and operating the instrument.
Section 3 — Performance Check: Provides procedures to check
the operational performance of the instrument plus
additional performance check procedures that require test
equipment to verify that instrument performance is in
accordance to specifications.
Section 4 — Calibration Procedure: Describes test equipment
setup and adjustment procedures required to calibrate the
Section 5 — Circuit Description: Provides basic and general
circuit analysis that may be useful when servicing or
operating the instrument.
Section 6 — Maintenance Instructions: Describes routine and
corrective maintenance procedures with detailed instructions
for replacing assemblies, subassemblies, and individual
components. Troubleshooting procedures, plus general
information that may aid in servicing the instrument, are
also provided. An exploded drawing is part of Section 10.
Section 7 — Options: Describes options available for the
Section 8 — Electrical Parts List: Provides information
necessary to order replaceable parts and assemblies.
Section 9 — Diagrams: Provides functional block diagram and
detailed circuit schematics. Located adjacent to the diagram
(usually on the back of the preceding diagram) are pictoral
layout drawings that show sub-
assembly and component locations. IC logic diagrams,
waveforms and voltage data, fortroubleshooting orcircuit
analysis, are also provided adjacent to or on the diagram.
Section 10 — Mechanical Parts List, Exploded Drawings and
Accessories: Provides information necessary to order
replaceable parts. The Parts List is cross-referenced to the
Electrical Parts List. Exploded drawing shows sequence of
assembly and identifies assemblies.
Changes and Corrections: Provides updating information for
the manual in the form of inserts. These inserts are
incorporated into the manual text and diagrams when the
manual is reprinted.

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