Tektronix 7L5 Instruction Manual page 22

the crt. This condition is an unavoidable result of the
digital storage on the FREQUENCY SPAN/DIV set to other
rotate the DOT MKR control max ccw to the detent
apply the input signal.
Frequency Measurement Technique
Frequency measurement should be made on the se-
has been changed. (Oscillator stabilization time is
FREQUENCY control assembly.
RESOLUTION to 30 kHz or COUPLED position. The
COUPLED position will maintain a desired ratio of 20:1 or
less between the frequency span per division and the
resolution bandwidth.
Resolution, Resolution Bandwidth
signal.
Operating Instructions—7L5 Operators
Bandwidth determines both the noise level and resolu-
tion capability of the analyzer. As bandwidth decreases,
both sensitivity and signal-to-noise ratio improve. Max-
imum sensitivity is obtained when resoltuion bandwidth is
For most applications, the analyzer should be used with
the RESOLUTION control set to COUPLED and the
TIME/DiV switch set to AUTO. These auto-ranged
positions provide the best sweep rate and resolution
bandwidth for each setting of the FREQUENCY
SPAN/DIV switch. When the analyzer is used to make
amplitude measurements, especially in digital storage
mode, the COUPLED and AUTO positions of these
controls ensures maximum accuracy.
When using digital storage, the best measurement
1. VIDEO Adjust to place the cursor at a point
PEAK/VIDEO midway between maximum signal
AVERAGE: amplitude and baseline noise.
2. DISPLAY A/ Press both pushbuttons to activate
DISPLAY B storage operation.
3. RESOLUTION Set to COUPLED position.
4. TIME/DIV: Set to AUTO position or a position
that is compatible with the setting of
FREQUENCY SPAN/DIV_ control
(UNCAL light not illuminated).
Applications for Spectrum Analyzers
Applications for spectrum analyzers such as the 7L5
include; measuring intermodulation products, radiation
relative signal level measurements, bandpass
characteristics, etc. Numerous application notes on spec-
trum analyzer measurements are available from your local
Tektronix Field Office or representative, including