Power Dbm Display - HP 8340A Operating Manual

Model 8340A
DESCRIPTION
This display shows the actual power delivered to the RF OUTPUT port of the HP 8340A,
and contains the UNLEVELED warning indicator.
PANEL LAYOUT
FUNCTIONS
The available output power of the HP 8340A is shown in this display,
POWER dBm:
rounded to the nearest 0.1 dB. Depending on the installed attenuator, the available power
ranges from a minimum of -110.00 dBm to a maximum that depends on frequency, with a
resolution of 0.05 dB
frequency band). If the user requests a power level that the HP 8340A cannot provide, the
instrument will select the closest available power and show that value in the POWER dBm
display (to 0.1 dB); in this situation the ENTRY DISPLAY, which shows user-selected
+
power level, will not match the POWER dBm display which shows actual power.
The procedures for setting the power level are explained in Figures 3-7 (POWER LEVEL)
and 3� 17 (POWER SWEEP, PEAKING, and RF OFF).
This display can be blanked (turned off) by pressing
is blank, the power functions can be changed by the same local and remote procedures that
are used with an active display. Press
INDICATORS
UNLEVELED: The red UNLEVELED annunciator indicates trouble, either from operator
error or machine malfunction, with one exception.
request for too much power. If the operator requests a power output that is
Operator error:
too high for the HP 8340A at that frequency, the UNLEVELED annunciator lights.
Typically, the HP 8340A can deliver more power than listed in the specifications (Table 1-1);
the UNLEVELED annunciator wm light when the true maximum power level has just been
exceeded. To remedy an UNLEVELED condition either
manual modes, as explained in Figure 3-17), or reduce the requested power.
UNLEVELED
0.0
(see Table 1-1 for the specified maximum power available for each
[SHIFT] [CONl]
Figure 3-3. Power dBm Display (1 of 2)
Scans by HB9HCA and HB9FSX
Operating Information
Although the display
[SHIFT] [CONT].
to regaii1 an active display.
the instrument (for CW or
[PEAK]
3-7