Agilent Technologies N1911A Instrukcja Użytkownika Pobierz pdf (Strona 2)

Frequency Sweep Mode

Frequency Sweep mode is used in a frequency response calibration system where the ampli-

tude is constant and the frequency of the power source signal is swept. This mode can be used

to determine the frequency response of a device under test (DUT).

Table 1. Procedures to conﬁgure the N1911A/12A power meter for frequency sweep mode

Step Procedures

1 Connect the power sensor to the signal generator/signal source

2 Connect the power meter TRIG OUT to the signal source TRIG IN using

a BNC cable. The same connection is applied between the signal source

TRIG OUT and the power meter TRIG IN

3 Press [Channel] on the power meter. Set the Sensor Mode to AVG Only

4 Press [Trig/Acq] on the power meter, 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 the 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 [Channel] or [Meas] on the power meter to conﬁgure the

measurement settings such as averaging, measurement frequency, offsets,

and duty cycle

9 Set the frequency range and step by sending the below commands through

SCPI:

• SENSe:FREQuency:STARt <start_frequency><frequency_unit>

• SENSe:FREQuency:STOP <stop_frequency><frequency_unit>

• SENSe:FREQuency:STEP <frequency_step_size>

10 Send an *OPC command to the power meter

11 Set the power meter to Continuous Trigger mode by sending the

INITiate:CONTinuous ON command

12 Conﬁgure and set the required power sweep range and step on the signal

source accordingly

13 Set the signal source trigger input and trigger output, then start sweeping

14 Poll the status of the power meter by sending an *ESR?. *ESR will return

1 when buffering is completed. Use FETCh? to retrieve all buffered

measurements

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Agilent Technologies N1911A Instrukcja Użytkownika Strona 2