4
Table 2. Procedures to confi gure the meter for frequency sweep mode.
No. Procedures
1. Connect sensor to power source.
2. Connect power meter TRIG OUT to power source TRIG IN using a BNC cable.
The same connection is applied for power source TRIG OUT to power meter
TRIG IN.
3.
Press
. Set the Sensor Mode to AVG Only.
4.
Press
, Acqn and select either Sing Trig or Cont Trig.
5. Press Settings, Source, Ext to set the trigger source to external.
6. Press 1 of 2, Output, On to allow TTL level high to be produced at TRIG OUT.
7. Set the trigger buffer size by sending the SENSe:BUFFer:COUNt <buffer_size>
command to the meter through SCPI.
8.
Press
or to confi gure the measurement settings such as averaging,
measurement frequency, offsets, duty cycle and so forth.
9. Set the frequency range and step by sending the below command through SCPI.
• SENSe:FREQuency:STARt <start_frequency><frequency_unit>
• SENSe:FREQuency:STOP <stop_frequency><frequency_unit>
• SENSe:FREQuency:STEP <frequency_step_size>
10. Send the *OPC command to the meter.
11. Set the meter to continuous trigger mode by sending INITiate:CONTinuous ON
command.
12. Confi gure and set the required power sweep range and step on the power
source accordingly.
13. Set the power source trigger input and trigger output, then start sweeping.
14. Poll the status of the power meter by sending *ESR?. *ESR will return 1 when
buffering is completed. Use FETCh? to retrieve all the buffered measurement.
Frequency Sweep Mode
Frequency sweep is generally used
in a frequency response calibration
system where the amplitude is
constant, and the frequency of the
power source signal is swept. This
mode can be used to determine the
frequency response of a DUT.
In this mode, you are required to
input only the start, stop and step
frequencies through SCPI. Buffer size
is not required to be set as the meter
will automatically calculate from the
start, stop and step frequencies. To
confi gure the meter for frequency
sweep, refer to Table 2. and follow the
procedures.
(296 Seiten)
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