Operating instructions

LOCAL OPERATION
3-11
Setup page 1
This page allows the following optional settings to be selected.
RF Counter Resolution 0.1 Hz/1 Hz/10 Hz
The RF counter resolution can be set to 0.1 Hz, 1 Hz or 10 Hz. Selecting 1 Hz will slow the
screen update rate by a factor of 10:1, selecting 0.1 Hz will slow it by a factor of 100:1. The
choice is made by stepping through the three options using the soft key adjacent to the text.
The speed of the autotune function is also related to the selected RF Counter Resolution
RF Level Measured in Watts/Volts/dBm
The RF level from the transmitter being tested can be displayed in terms of Watts into a 50
ohm load, voltage across the 50 ohm load or dBm into 50 ohms. The choice would normally
be made so as to match the specification parameter of the transmitter under test. The selection
is made by pressing the soft key adjacent to the text. This will toggle through the three
options.
AF Distn/SINAD Averages
When distortion or SINAD tests are made to receivers using the Rx TEST mode or AF TEST
mode, the results displayed are obtained by averaging the results of a number of
measurements. This allows the user to balance the speed of testing against greater
repeatability of measurement. The number of measurements made can be set within the range
1 to 20 by entering the required figure using the data input keys.
AF Filters
The AF Low pass and band pass filters available for the Rx TEST mode, for the AF TEST mode
and for the modulation meter within the Tx TEST mode can be customized from the setup page
accessed from this key.
The AF Filters setup page is shown below.
B5888
Fig. 3-4. AF Filter HELP/SETUP page.
Factory Default filter settings
The [Factory Preset] soft key will reset all of the filters to their ‘Factory Default’ settings. The
low pass filter settings are 15.0 kHz (LP1), 3.4 kHz (LP2), 3.0 kHz (LP3) and 300 Hz (LP4).
The ‘Factory Default’ band pass filter settings are as shown below:-
Band pass 1 300 Hz high pass 3.4 kHz low pass (LP2)
Band pass 2 50 Hz high pass 15.0 kHz low pass (LP1)
Band pass 3 300 Hz high pass 15.0 kHz low pass (LP1)
Band pass 4 50 Hz high pass 3.4 kHz low pass (LP2)