Boonton 4540 Peak Power Meter User Manual - Manual (Page 193)

Boonton 4540 Series RF Power Meter
Remote Operation 5-59
SENSe:MBUF:SIZe
Description: Set or return the size of the measurement buffer. This controls how many readings will be
buffered before the buffer is considered full. If set to zero, the measurement buffer is disabled,
and the instrument operates in normal mode. When the buffer is full, no more reading will be
placed into the buffer. If INITiate:CONTinuous is OFF, measurements will be considered
complete, and the instrument will stop when the buffer has filled. Time to fill the buffer is
determined by SIZE divided by RATE in Modulated mode (see below), and by the triggered
sweep rate in Pulse mode.
When the buffer size is set to –1, the buffer operates in circular/FIFO mode. In this case, the fixed
length is disabled, and the buffer is never considered full. When acquisition reaches the end of the
buffer, it will simply ―wrap‖, and begin overwriting the beginning of the data.
Note that the SIZE parameter affects both channels, so operating modes and buffer write positions
remain synchronized. Issuing the SIZE command also resets the buffer write (POS) and read
(INDEX) pointers.
Syntax: SENSe:MBUF:SIZe <numeric_value>
Argument: <numeric_value> = –1 to 1048576 (0 = Buffering disabled. –1 = Circular/FIFO operation)
Valid Modes: Pulse and Modulated.
SENSe:MBUF:RATe
Description: Set or return the reading acquisition rate for the measurement buffer in Modulated modes. This
controls how fast readings are placed into the measurement buffer, and SIZE divided by RATE
determines how many seconds it will take to fill the buffer. Note that buffer readings may be
repeated if RATE is set faster than the internal measurement rate of the instrument (500
readings/sec in Modulated mode), and best performance is achieved when RATE equals, or is an
exact submultiple of the internal measurement rate.
Note that the RATE setting affects both channels, so operating modes and buffer write positions
remain synchronized. The RATE setting has no effect in Pulse mode, in which case the buffer
acquisition rate is determined by the triggered sweep rate.
Syntax: SENSe:MBUF:RATe <numeric_value>
Argument: <numeric_value> = 1 to 1000 buffered readings/second
Valid Modes: Modulated Mode