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
. 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.
requires three Plug-In
widths in the 7000-
The following characteristics and features of the 7L13
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
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
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
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
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.