2-3 Making Spectrum Analyzer Measurements
Spectrum Analyzer
2-4
PN: 10580-00349 Rev. M
Spectrum Analyzer MG
The
Show Help
submenu key displays a table detailing the trade-off between sweep speed and
performance of the sweep mode options..
Trigger Type
To select a specific type of triggering in zero span, press the
Triggering
submenu key followed
by the
Source
submenu key. Selections are:
Free Run:
The default trigger type is “Free Run” in which the instrument begins
another sweep as soon as one is finished.
External:
A TTL signal applied to the External Trigger BNC input connector causes a
single sweep to occur. This mode is used in zero span, and triggering occurs on the
rising edge of the signal. After the sweep is complete, the resultant trace is displayed
until the next trigger signal arrives.
Video:
This mode is used in zero span to set the power level at which a sweep is
initiated. The power level can be set from –130 dBm to +30 dBm. Trigger is based on
the measured signal level. The sweep triggers when the signal level crosses the trigger
level with a positive slope. If no signal crosses the trigger level, the last trace on the
screen, before video triggering was selected, will be displayed. To change the video
triggering level use the rotary knob, enter the desired amplitude with the keypad, or
use the left or right arrows to change the setting by 1 dB or the
up or down
arrows to
change the setting by 10 dB.
IF Power
(available on MS2720T model only)
:
This mode is used in zero span to set IF
power level as the trigger source. The power level can be set from –130 dBm to
+30 dBm, using the rotary knob, arrow keys, or keypad. The trigger is based on the
measured signal level. If no signal reaches or exceeds the trigger level, then no trace
will be displayed on the screen.
Zero Span IF Output
(Standard or Option 89): Zero Span IF Output provides an IF signal
that is nominally at 140 MHz out of a BNC female connector labeled
IF Out 140 MHz
or
IF Out (option) 140 MHz
.
You can select
Normal
or any one of four fixed IF bandwidths of
7 MHz
,
10 MHz
,
16 MHz
, or
32 MHz.
In
Normal
, the bandwidth is set by the spectrum analyzer RBW selection (
BW
> Zero
Span RBW
). When
Normal
is selected, the IF bandwidth is influenced by the selection of RBW
filters, although the digital RBW filters themselves are not employed.
Note
Sweep Mode menu functionality varies based on instrument model. Fast is the
default sweep mode for instruments that have received the new instrument
calibration from Anritsu.
Note
s
The IF output signal is present only when the spectrum analyzer Span is set to
zero and the
Zero Span
button has been pressed a second time to bring up the IF
bandwidth menu (refer to
“Zero Span IF BW Menu (Option 89)” on page 2-59
). The
key sequence is:
Span
>
Zero Span
>
Zero Span
.
MS2723B and MS2724B instruments use IF frequency of 37.8 MHz rather than the
140 MHz of other Anritsu Spectrum Masters. IF output bandwidth is limited to
16 MHz. For these MS2723B and MS2724B instruments, the BNC connector is
labeled
IF Out 37.8 MHz
.
Содержание BTS Master
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