LOCAL OPERATION
3-33
WARNING
Hot surfaces
Take care when touching the RF Input Type N connector after the application of high levels
of continuous power. If 50 W is applied for a prolonged period, the temperature of the
connector can become excessive.
With the monitor in the Tx TEST mode, and the transmitter connected to the monitor as described
above, key up the transmitter.
The RF power bar chart gives an analog representation of the active power meter reading. A
digital read-out of the power is displayed above the bar chart.
The options available for the digital read-out from the power meter are dBm, Watts or Volts.
The bar chart can be auto-ranging or manually selected. See
Bar charts on page 3-19.
External attenuators can be included in the input path to the Service Monitor. The value of any
such attenuators can be entered into the RF Setup page (page 3-15), which will cause the power
measurement software to calculate the power at the attenuator input. The result of this calculation
is shown on the RF power bar chart and as the digital power reading.
Power readings that include an attenuation factor have an inverse video 'A' adjacent to them.
An inverse video ‘H’ indicates that the receiver input is in held mode.
The full-scale ranges of the RF power bar chart are:
10 mW to 100 kW in 15 steps of 1-3-10 sequence.
100 mV to 3 kV in 16 steps of 1-3-10 sequence.
External attenuators
Compensation for an external attenuator or test fixture included in the RF input path of the
monitor can be programmed. The value, in dBs, of the attenuator should be entered in the
RF Power Ext Atten: field of the RF Setup page (page 3-15). The value of the attenuator will then be
included in power calculations and the power indicated by the power meter will be that at the input
to the external attenuator.
This feature makes use of the extended ranges of the power meter.
The value of the attenuator will also be included in RF level calculations and readouts when in the
Rx TEST mode and in Dx TEST mode.
‘A’ is shown against any signal level that has been calculated to include the external attenuator.
*OSCILLOSCOPE*
With the oscilloscope facility selected, the POWER bar chart is removed from the display but the
digital read-out of the power level is retained.
*DUPLEX*
With the monitor in the Dx TEST mode the POWER bar chart and digital display remain in the
same location and the indications are identical to those given in the Tx TEST mode.
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