OPTION 008 RF PROFILES AND COMPLEX SWEEP
Annex-B-10
Fig. B-9 Using a signal generator with an external amplifier
A profile can now be added to reduce the frequency dependent RF level errors. With the signal
generator level set at (for example) 0 dBm and unlocked to Level 1, select the
RF Profile Editor
shown in Fig. B-6.
Enter a carrier frequency of 100 MHz. Adjust the
Profile Level
until the power meter reads 0 dBm
and then save the point. Repeat for carrier frequencies of 150 MHz, 200 MHz, 250 MHz,
300 MHz, 350 MHz, 400 MHz, 450 MHz and 500 MHz. The profile will now have 9 calibration
points entered.
Use the
[Store Profile]
key to store as Profile 0. Exit to the
RF Profile Menu
and select and
enable Profile 0.
Press the [SIG GEN] key to obtain the main Sig Gen menu. Use the rotary control to vary the
carrier frequency between 100 MHz and 500 MHz and check that the power meter reading is
acceptably close to 0 dBm. Extra points can be added to the profile if required to reduce errors at
intermediate frequencies.
Sequence sweep
The sequence sweep facility allows sweeps to be defined and generated containing up to 10
segments with independent parameters.
The sweep segments differ from the normal sweep facility on 2050T Series Signal Generators in
that the step size is defined rather than the number of steps in a sweep. Each sweep segment can
have a different RF level, step size and step time as well as independent start and stop frequencies.
A sweep similar to that shown in Fig. B-10 can therefore be generated.
If the carrier frequency is set (in this example) below 100 MHz or above 500 MHz the error
message Carrier Outside Profile will be displayed. The profile value at 100 MHz will be applied
to the RF output level for frequencies below 100 MHz. Similarly the profile value at 500 MHz
will be applied to the RF output level for frequencies above 500 MHz.