HP 8340A Operating Manual page 58

SINGLE sweeps
Started when this key is pressed.
Next, rotate the
change. The range is -20 dBm for the lowest value,
to an upper value that depends on frequency (see
the specifications; the specified upper value is +10
dBm at 12 The maximum effective upper
GHz).
value is determined by watching the POWER dBm
display (which shows the ATN + ALC sum) as you
increase the ALC value:
annunciator will light when you exceed the max­
imum value. The maximum range of your power
sweep equals the maximum leveled range of the
ALC, with the ATN providing a fixed offset.
Set the ALC to -15 dBm for this example, using the
or the numeric keys (with the
minator key). The POWER dBm display will show
-55 (-40 ATN plus -.:.15 ALC), and the power
sweep range can be at least 25 dB (ALC range of
-15 to +10 dB).
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The rest is easy. Press
DISPLAY will display 0.00 dB/SWP. Use the
keys, or the or the numerical keys (with the
t.'W 0
rnoo� ·•cv
"'"
MAN UAL sweeps
Controlled by the rotary KNOB.
as you watch the ALC value
The red U NLEVELED
ter�
.
and the ENTRY
.
Scans by HB9HCA and HB9FSX
Power Level
increment):
Press SH I
FT,
1.
Enter value.
2.
Press dB(m).
3.
I>' � <l�ltlli " �D ltll.IQU
POWER LEVEL:
Press POWER LEVEL.
1.
Enter value.
2.
Press dB(m}.
3.
terminator key) to change this to the
desired sweep range. For this example, press
and the HP 8340A will power sweep from -55
dBm to -30 dBm, in a 10 second period.
Before leaving the power sweep function, there are
two more keys you should try. Press
c hange from C O NTinuous sweeps to single
sweeps, which start every time you press the
key (if you press
a sweep, the sweep will stop).
which will allow you to use the
manually sweep through the -55 to -30 dBm
range.
Press
again to turn power sweep off,
and press
and ALC. Swept frequency operation is explained
in the next section.
6
Step Size (STEP keys
POWER LEVEL.
in the middle of
Next, press
1. ; Y�ff :\¥ �(l
to re-couple the ATN
to
to