Operating instructions

LOCAL OPERATION
3-42
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, by voltage level with the [V], [mV] or [µV] terminator key or in dBµV with
the [dB] key.
Voltage levels and dBµV 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 A against them. See RF Power Ext Atten : dB, on page 3-12.
To enter an output value press the [RF Gen] key, followed by the orange [LEVEL] function key.
The
GEN and LEVEL 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
GEN and LEVEL legends highlighted, the GEN LEVEL parameter can be adjusted by using
the variable control.
Level increment
The LEVEL [×] and [Ø] keys can be assigned to RF generator level adjustment. See Incremental
adjustments
which starts on page 3-68.
Attenuator hold
The Service Monitor has an attenuator hold facility that allows for a ‘ seamless’ range of RF
output level. This has a minimum range of 10 dB with a maximum range of 20 dB at certain
selected points of the output range. The facility is enabled and set from Setup Page 2 of
HELP/SETUP.
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 %).