L3 NARDA PMM 9010, User Manual

Page: 27 / 108

Setup and Panel Instructions 3-3
3.4 Unit
Entering in the Unit menu it is possible to change the indicated unit used to
display the measured levels.
The available units are
dBµV and dBm .
In a 50 Ohm system the relationship between dBm and dB
µ
V is:
dB
µ
V = dBm + 107
i.e., 0 dBm (1 mW) = 107 dB
µ
V
3.5 RF OUT
The
tracking generator is an internal, high stability and accuracy, 50 Ohm
RF generator ranging from 10 Hz to 50 MHz.
Activating the
Tracking On function the generator is always tuned at the
same PMM 9010 measurement frequency and scans the range together
with the receiver. This is the standard way a tracking generator works in all
spectrum analyzers.
If the Tracking On function is disabled, the generator becomes a CW signal
source tuned at the frequency set under the
RF OUT Freq window.
As usual, to set a given frequency it is therefore enough to edit the value
with the soft keys and the left and right arrows, confirming the selections
entering the units value (kHz, MHz or GHz).
Pressing 0 as the first figure the decimal dot appears automatically.
In both operating modes (tracking or fixed frequency) the output level can
be set between 60,0 and 90,0 dBµV with 0,1dB steps using the
RF OUT
Level button.
If a higher or lower level is needed, the User shall adopt either an external
amplifier or an external attenuator.
The tracking generator is extremely useful for several applications: first of
all it is essential to calibrate the receiver itself thanks to the automatic
internal routines specifically developed to this extent, then it can also be
used to transform the PMM 9010 in a scalar network analyzer, helping a lot
in designing and testing RF filters, active stages and a lot of other circuits.
3.6 Panel
The Panel function allows the User to store up to 2 different setups that can
be recalled any time.
Pressing Save #1 or Save #2 the actual setup is stored in the internal
memory; with the two Recall buttons the corresponding setup is loaded to
the receiver.
Please remember each time one of the Save buttons is pressed, the stored
set-up is overwritten by the new one: the saved setups are therefore kept
memorized in the receiver until a new set-up is stored in the same memory.
The
Default button can be used to load a default standard setup saved into
the memory at the factory.