11. Overload Indication
The overload indication of the VM30-H monitors the following points of the signal path:
•
Overload or saturation at the sensor output at a peak sensor voltage above ±6 V.
•
Input signals exceeding ±12 mV, ±120 mV or ±1200 mV depending on the selected
measuring range. With the highest measuring range the maximum input magnitude is
limited to ±6 V by the a.m. maximum sensor output.
•
Overload at the integrator outputs.
The instrument has two kinds of overload indicators.
An overload of the currently displayed value is indicated as a message
OVER LOAD
instead of
the measuring value for the corresponding channel.
A second overload message can appear instead of the filter type on the display above the
measuring results. This may happen if one of the averaging display modes eVDV, A(T) or Ahv
has been selected. It indicates that an overload condition occurred during at least one measuring
cycle on one or more channels during the entire averaging time. If the message Overload
appears, the displayed results may be invalid. This overload message is erased when starting a
new measurement by pressing the ESC key.
12. Saving Measuring Results
The VM30-H can store between 1000 and 3000 measurements, depending on the selected
recording mode.
The following recording modes are available:
•
Manual recording of a single measurement in X / Y / Z direction by the SAVE key. You
may specify whether a comment, the clock time and the date are to be added to the saved
measuring values.
•
Time-controlled recording in the data logger mode in a user-defined time interval between
1 second and some hours.
The selection of the recording mode is made in the menu “2/8: Recording setup”. Select manual
recording (manually by SAVE key) or time-controlled recording (by data logger).
The two recording modes cannot be mixed in the memory. The VM30-H can either hold
manually recorded or logger data. If the instrument should detect data of the other type in its
memory, a warning will inform you that the memory will be overwritten.
12.1. Manual Recording by the SAVE Key
After the selection of manual recording in the submenu “2/8: Recording setup” you will then be
asked if you want to add a comment. The comment with up to 20 characters may contain, for
example, information about the measuring point or the test conditions. Recording without
comment may save approximately 40 % memory space.
In the next step you can decide whether you want to add the clock time and the date to each
record. They occupy approximately 10 % of the memory space.
The actual recording is done by pressing the SAVE key when the instrument shows measuring
values. If the comment function has been enabled, you will be asked to enter a text by means of
the ◄▲▼► keys. The comment may consist of up to 20 capital letters and numbers.
After pressing OK, the measurement is saved while the display shows date, time and available
memory space for two seconds.
Should the memory contain data which was saved in the time-controlled (logger) mode, a
warning indicates that the memory will be overwritten.
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