Svantek SVAN 948, User Manual

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SVAN 948 USER MANUAL
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Operations in buffer
The buffer is the selected part of the instrument’s memory dedicated for storing the huge number of
the measurement results. Its capacity is ca 3.4 Mbytes (for the unit with 8 MB of internal memory). The
buffer operation is strongly dependent on the operation mode of the instrument (the selected function).
Notice: The new file in the buffer is created after each start of the new measurement. The
contents of the buffer (all registered files) are erased after execution the CLEAR BUFFER operation from
the FILE list. It is not possible to erase only one or few selected files from the buffer!
1. In the Sound Level Meter mode selected results from each of four channels can be logged in the
buffer’s file with the time step defined in the BUF. STEP position. If the value set in this position is
equal to 1 sec, thus for three profile results logging the buffer is fulfilled after 168 hours (or 7 days) of
the continuous work. If the results from only one profile are saved the buffer will be filled after
500 hours (21 days) of work!
EXAMPLE 1.
Assuming that the following settings are selected:
MEASURE SETUP sub-list INT. TIME: 10 m ,
REP. CYCLE: 1 ,
BUF. STEP: 1 s ,
BUFFERS SETUP sub-list CHANNEL 1: BUFFERS: PEAK ,
CHANNEL 2: BUFFERS: RMS ,
CHANNEL 3: BUFFERS: None .
CHANNEL 4: BUFFERS: None
Then after 10 minutes (the value set in INT. TIME position) and after one measurement cycle (the
value set in the REP. CYCLE position) the current file in the buffer will contain 600 PEAK values from the
channel 1 and 600 one second RMS values (one second set in the BUF. STEP position) from the
channel 2.
EXAMPLE 2.
Assuming that the instrument set-up is as follows:
MEASURE SETUP sub-list INT. TIME: 1 m ,
REP. CYCLE: 1 ,
BUF. STEP: 7 s ,
BUFFERS SETUP sub-list CHANNEL 1: BUFFERS: PEAK ,
CHANNEL 2: BUFFERS: RMS ,
CHANNEL 3: BUFFERS: None .
CHANNEL 4: BUFFERS: None .
Then after the end of the measurement the current file in the buffer will contain 8 PEAK values (for
each 7-seconds period set in the BUF. STEP position) from the channel 1 and 8 RMS values from the
channel 2.
Notice: The setting in a profile BUFFER: ON will result in bypassing the registration of the
measurement results from this profile in the current file in the buffer. In the same time it will create more
space in the buffer for the results from other profiles (independent instruments)!
2. In 1/1 OCTAVE or 1/3 OCTAVE analysis one selected result from each of three profiles together with
the spectra can be logged in the current file of the buffer with the step selected in the BUF. STEP
position.