Anritsu FAQs

A good possibility is that the meter is set to the wrong trigger mode for the measurement. There are 3 different trigger modes: 1) Continuous. The instrument restarts the acquisition process immediately after displaying the results. This setting is most suitable when there is no particular amplitude pattern in the measurement, such as when measuring a CDMA signal. 2) Internal, (Channel A or B). The trigger signal is obtained by monitoring the RF signal level measured by the sensor on the respective channel. Triggering occurs when the level crosses a specific setpoint. 3) External. Data acquisition is triggered by a TTL transition on the external BNC input (on the back of the meter). The meter can be set up to respond to either a rising or falling edge. A common mistake is to have the meter in External mode when it should be in Internal A or B. The trigger can be changed by pressing the "Channel" hard key, then the "Trigger" softkey, followed by the "Trigger Source" softkey. Press the "Internal" softkey to activate the trigger on channel A. An orange arrow on the screen will indicate the trigger level. For more information on Triggering, please refer to pages 5-22 through 5-30 of the Operation Manual.