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6. USE WITH OTHER INSTRUMENTS
6.1. LEVEL RECORDERS TYPES 2305 AND 2307
6.1.1.
General
In recording a frequency analysis from the 2010, the choice is available
whether to record the unaveraged AC output or the RMS rectified signal
from the DC output.
With the AC output from the 2010, RMS averaging of the recorded signal
is performed entirely by the Level Recorder. The principal control of the
Level Recorder which determines its averaging time is the WRITING SPEED
selector. The averaging times given in Table 6.1 for the two Level Recorders
are approximate values and are valid for measurement bandwidths greater
than the minimum bandwidths specified.
WRITING SPEED
AVERAGING TIME
MINIMUM MEASUREMENT
BANDWIDTH
mm/sec.
sec.
Hz
1000
0.015
400
800
0.020
200
630
0.025
135
500
0.035
100
400
0.050
60
250
0.090
35
160
0.116
25
100
0.300
15
63
0.55
7
40
1.0
4
25
2.1
2
16
5.7
1
8
60.0
<1
Table 6. 1.
Relation between WRITING SPEED of the Level Recorders
2305 and 2307, and RMS signal averaging time
59
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