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Agilent 53220A (Frequency Counter) STB is low while an error is present

Question asked by engst on Sep 10, 2014
When remote controlling the Agilent 53220A Frequency Counter, the following situation occurs:

After we write a READ? command to perform a measurement and directly perform the read operation in order to retrieve the measurement value, it seems that an error has occurred (can be seen on the device and a beep is to be heard).

However, when we now query *STB? it is still responding with 0. By query the SYST:ERR? the error (+321,"Measurement timeout occurred") can be retrieved from the device as expected.

This seems to be unexpected behavior of the device or is it working as intended?