LOCAL OPERATION
3-15
RF Setup page
RF Counter Resolution:
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:
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 ohm. 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.
RF Input Level
Holds the receiver’s input attenuator at a fixed level. The level is set manually by using these
up/down soft keys. The displayed values indicate the maximum
input level that should be applied
to the receiver. A held input level is indicated on the Tx and Dx screens by a red inverse video
‘H’.
Auto Range
Sets the receiver input attenuator to autorange.
Atten Hold:
The Attenuator Hold facility provides a ‘seamless’ range of RF Generator output that is not
subject to switched attenuator action. The available range is up to 20 dB, with a guaranteed range
of 10 dB.
Atten Hold Level:
The value entered here sets the upper level of the ‘seamless’ range of RF Generator output. The
value must be within specified output range of the RF Generator. There is no account taken of any
RF Power External Attenuator settings entered in the Test Set, neither is the settable range
restricted when the ‘N’ type Connector is selected.
RF Power Ext Atten:
The value of any attenuator entered here is considered as part of the instrument and all power
measurements will be as from the input to the attenuator, not to the instrument input. Similarly
power output levels will be adjusted to take account of the external attenuator value entered.
To enter a value of attenuation, which must be in dB, press the adjacent soft key, key in the digits
of the value using the data entry keys and then press the dB terminator key.
The entered value will be applicable to all RF connectors into and out of the monitor. When
changing test setups or test modes this must be taken into account to prevent erroneous readings.
The indicator A is shown against any signal level which has been calculated to include the external
attenuator.
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