Leveling - HP 8340A Operating Manual

Operating Information
DESCRIPTION
Internal or external (crystal or power mete-r) power leveling is selected by these keys, which
also select a band crossing diagnostic and allow direct linear modulator access. The external
levding BNC input connector is also described in this Figure.
PANEL LAYOUT
FUNCTIONS
BNC connector is the input port for an external leveling signal. The signal
EXT INPUT
requirements are listed in Table l-1. See the Operating Guide "Externally Leveling the HP
8340A Synthesized Sweeper," located at the end of Section III, for detailed information
about external leveling procedures.
(HP-IB: Al) selects internal leveling of the HP 8340A Table 1-1 (Specifications) lists
[INT]
the maximum leveled power for each frequency band, and other power function
restraints.
(HP-IB:
[SHIFT] [INT]
is used with
[SHIFT] [XTAL]
for an explanation of how these two shifted functions interact, and see Section VIII (Service)
for a comprehensive explanation of this diagnostic function.
(HP-IB:
[XTAL]
RF output (derived from a coupler or a splitter) must be detected, with the detected output
being delivered to the
loop (the loop typically has 7 kHz bandwidth). Press
REF: -xx.xx dBV" (where x is the last-entered value) will appear in the entry display.
Then usc the rotary
change the REFerence level, and the
the POWER dBm display (allowing for losses in the coupler or splitter) or an attached
power meter. The "Externally Leveling the HP 8340A Synthesized Sweeper" operating guide
(HP Pait Number 08340-90041) located at the end of this Section fully explains crystal
leveling and shows typical equipment interconnections.
[SHIFT] (XTAL]
(SHIFT) [XTAL]
HP 8340A to sweep to the first band crossing point and stop at that point. Press
again and the HP 8340A will sweep to the next band crossing point and stop at that
[INT]
point Continue pressing
[SHIFT] [XTAL]
will cause the HP 8340A to stop at the end of a sweep.
[SHIFT] [INT]
3-30
SHAI) allows single-stepping through each frequency band, and
for a band crossing diagnostic routine. See
A2) activates external crystal leveling of the HP 8340A. A portion of the
BNC connector, thus forming an output-input feedback
EXT INPUT
or the numerical keys with the
[KNOB]
[STEP]
(HP-IB: SHA2) activates a band crossing diagnostic function. Press
to enable the diagnostic, then press
[SHIFT] [INT)
again to cancel his diagnostic routine.
t
Figure 3-16.
Scans by HB9HCA and HB9FSX
[XTAL],
[dB(m)]
keys to change the ATN while watching either
[SHIFT] [INT],
to single-step through each of the b
[SHIFT] [XTAL]
Leveling (I of 2)
Model 8340A
[SHIFT] [XTAL]
and "ATN: -xx dB,
terminator key to
which will cause the
[SHIFT]
nd
Press
a s
.
used without