Operating instructions

OPERATING MANUAL 2945A
46882-311D 3-39
Output level setting
Range
N-Type connector, -135 dBm to -15 dBm; 0.04 mV to 40 mV pd
BNC connector, -115 dBm to +5 dBm; 0.4 mV to 400 mV pd
(with uncalibrated overrange to +7 dBm)
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.
The signal generator output level is set using the data keys. It can be defined in dBm with the
[dBm] terminator key or by voltage level with the [V], [mV] or [µV] terminator key.
Voltage levels will be shown as PD or EMF, depending on the selection made on setup page 1.
The output range from each connector is given in the Performance data section of chapter 1.
The signal generator output level from the BNC connector is calibrated up to +5 dBm. The
output level can be increased to approximately +7 dBm, uncalibrated.
Note that any external attenuator values entered on setup page 1 will reflect in the level
of indicated output. If an external attenuator value is currently set, output levels which
have been modified to take account of the additional attenuation will be indicated on the
display by
against them. See RF Power Ext Atten : dB, on page 3-11.
To enter an output value press the [RF Gen] key, followed by the orange [LEVEL] function key.
The
and legends will be highlighted.
Enter the required value using the data entry numeric keys and the relevant terminator key. The
level will be displayed in correct engineering convention.
Variable control
With the
and legends highlighted, the GEN LEVEL parameter can be adjusted by
using the variable control.
Level increment
The LEVEL [
] and [ ] keys can be assigned to RF generator level adjustment. See
Incremental adjustments
which starts on page 3-62.
Modulation
The RF signal generated for receiver testing can be modulated using either or both of the AF
generators or by an external source.
Modulation type
The modulation type is automatically set, to be appropriate to the level terminator key used (FM
for Hz, kHz or MHz; AM for %).
Modulation generators
Set up one or both of the modulation generators for the required frequency, level and shape by
using the soft keys and data input keys. When these and the de-emphasis filter are set to the
required settings press the [Return] key to restore the
RECEIVER TEST menu.