IMS 3638 Manual Del Usario página 25

4) When the green LED lights, hold that speed constant from 1 to 6 seconds (see "Run-up
Time Setting" on page 13 for setting of this system parameter). This constant RPM value
will trigger the measurement of sound levels and the following will occur:
• Type 3638 A/B's display shows sound levels instead of RPM and remaining measure-
ment time
• The green LED begins flashing, which indicates that sound level measurement is in
progress.
5) When the green LED starts flashing, release the throttle rapidly and allow the engine speed
to return to idle. The sound level meter measures from the time the RPM trigger occurs
until the engine has returned to idling position. The maximum sound level detected during
that period is used as the result.
6) Repeat steps 1 – 5 at least three times – the number of times depends on the applicable
legislation (see "Number of Measurements Setting" on page 14 for setting of this system
parameter). The results from the consecutive measurements must be within 2 dB of each
other. If not, the system will continue in measurement mode until this condition is satisfied.
When the required number of consecutive measurement results is within 2 dB, the system
automatically prints out the results. The highest measured value is considered the test re-
sult.
7) Sound level measurement is complete when the report is printed.
A new measurement can start immediately after a previous one. To set up measurement of
another vehicle with different characteristics and parameters, press
menu to configure the new parameters.
Manually Starting a Measurement
In cases where there is low-frequency noise present, it may be difficult for Type 3638 A/B to
detect the engine's RPM. In these cases, the display will show Waiting... for an extended
period.
To manually override this state, press OK. Measurements will begin as soon as an acoustic
signal is detected.
Measuring
1: 94.0 dB(A); 2 s
< < < < < < < < < <
Waiting...
< < < < < < < < < <
PART 1
21
English
and select the Setup