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Power dBm Display
DESCRIPTION
This display shows the actual power delivered to the RF OUTPUT port of the HP 8340B/41B, and
contains the UNLEVELED warning indicator.
PANEL LAYOUT
UNLEVELED
POWER dBm
FUNCTIONS
POWER dBm:
The available output power of the HP 8340B/41B is shown in this display, 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 (see Table 1-1
for the specified maximum power available for each frequency band). If the user requests a power
level that the HP 8340B/41B 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
[SHIFT] [CONT].
Although the display is blank,
the power functions can be changed by the same local and remote procedures that are used with an
active display. Press
[SHIFT] [CONT]
to regain an active display.
INDICATORS
UNLEVELED:
The red UNLEVELED annunciator indicates trouble, either from operator error or
machine malfunction, with one exception.
Operator error:
request for too much power. If the operator requests a power output that is too high
for the HP 8340B/41B at that frequency, the UNELEVELED annunciator lights. Typically, the
HP 8340B/41B can deliver more power than listed in the specifications (Table 1-1); the UNELEVELED
annunciator will light when the true maximum power level has just been exceeded. To remedy an
UNLEVELED condition either [PEAK] the instrument (for CW or manual modes, as explained in Figure
3-17), or reduce the requested power.
Figure 3-3.
Power dBm Display (1 of 2)
HP 8340B/41B
Operating Information
3-13
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