MMF VM30-H, Инструкция по эксплуатации, Страница: 54 / 58

24. Questions and Answers
Question Answer
Why does the VM30-H display only
one or two measuring values
although I have connected a triaxial
accelerometer?
The VM30-H recognizes open inputs and blanks the
respective channels.
Check the sensor connectors. Replace the cable or the
sensor, if necessary.
Note that only one value is displayed when measuring
vibration total value Ahv.
The VM30-H displays continuously
overload or invalid results.
Press the MENU key and select “6/8: Load defaults”.
After this the transducer sensitivities from the
calibration certificate, time and date must be entered
again. Stored data and user-defined setups will be lost.
What can I do if the instrument
cannot be switched on after
replacing the batteries?
Press the Reset button behind the battery cover (Figure
3). After this check time and date.
Why doesn’t the instrument display
react to changes of the vibration
magnitude after a longer measuring
time in the interval RMS mode?
As a result of averaging over the entire measuring time
do short vibration events not change significantly the
displayed value.
What can I do if the Excel macro
stops data transmission or receives
invalid data?
Reduce the baud rate in the Excel worksheet „Import“
and in the VM30-H menu “8/8: Device settings”.
Why does the VM30-H ignore or
change my settings of the
measuring range?
You measure eVDV or interval RMS A(T): These
display modes do not allow the use of autoranging.
Channels with autoranging are set to the highest range.
You measure vibration total value (Ahv): All three
channels are automatically set to the highest one of the
selected measuring ranges. When autoranging was
selected, all channels are set to the highest range.
What can I do if the Excel macro
displays the error message 1004
“Method ‘Columns’ … failed”?
Possibly you have activated one of the diagrams in the
logger worksheets. Click one of the table fields instead.
The Excel macro displays "Not
enough worksheets." when I import
data from the VM30-H. How can I
avoid this?
You have attempted to import more than 5 log files
from the VM30-H. First make sure that you wanted to
record log files but not single measurements in the
manual mode. In the latter case data will appear in the
“Manual” worksheet without limitation.
The number of log files is limited by the number of
prepared logfile worksheets. To increase this number
you may add more worksheets. Then you will also have
to change the number of logfiles in the Excel macro.
My instrument displays erroneous
data instead of time, date and user-
defined setups.
The instrument has been stored without batteries over a
longer period. Perform a reset as described in chapter
21 and reload the default settings (chapter 20).
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