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Function Keys
DESCRIPTION
This group of keys selects frequency mode, power level, sweep time, and associated functions.
PANEL LAYOUT
FUNCTION
r-
1
<
\
START
FREQ
1
r
n
STOP
FREQ
FREQ STEF
/-\
CF
c
.j
AF
^_
J
CW RES
LVl STEP
C
s
CW
k.
POWER
LEVEL
v_>
ZOOM
o
z'
SWEEP
TIME
SHIFT
FUNCTIONS
[START FREQ]
(HP-IB:
FA) selects the start frequency for start/stop swept operation. Press
[START FREQ];
then use either the rotary
[KNOB],
the
[STEP]
keys, or the numerical keys with a
terminator key to set the desired value. The start frequency must be at least 100 Hz lower than the
stop frequency. If there is less than 100 Hz between start/stop, or if the start frequency is greater than
the stop frequency, the HP 8340B/41B will change the start or stop frequency to achieve the required
separation. The order in which start/stop is entered is not important. If start/stop mode is inter¬
changed with CF/AF mode (by pressing either of the start/stop keys and then either of theCF/AF keys)
the sweep limits are the same. The start frequency appears in the left FREQUENCY MHz display.
[SHIFT] [START FREQ]
(HP-IB:
SHFA) scales the frequency displays by a multiplication factor
of—30 to +30. This is used, for example, when a frequency doubler or tripler is connected to the RF
output of the HP 8340B/41B, and the display values are multiplied by a factor of two or three to
indicate the system output frequency. Press
[SHIFT] [START FREQ],
then enter the integer multi¬
plication factor (-30 to +30) followed by any terminator key. The selected multiplication factor effects
all frequency functions (start, stop, CF, AF, markers and marker functions, and the dB/GHz slope
function), but the factor is not stored in the SAVE/RECALL registers (the current factor is used when
recalling those registers). Cancel the multiplication factor by pressing
[INSTR PRESET],
or enter a
multiplication factor of 1.
[SHIFT] [ALT]
saves the current multiplication factor as the instrument's
default value. In this mode, pressing
[INSTR PRESET]
or turning power off and on will not affect the
user-defined multiplication factor. This feature can be disabled by pressing
[SHIFT] [INSTR PRESET],
which sets the default multiplication factor to 1 and presets the instrument.
Figure 3-7.
Function Keys (1 of 3)
HP 8340B/41B
Operating Information
3-19
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