General Tools and Instruments VM8205SD - Manual (Page 8)

For any of several reasons (e.g., temperature changes, weak or new batteries, infrequent
use of the meter), the display may show a small, non-zero value after the vibration sensor
is plugged in but before it is placed in contact with a machine. In most cases, those residual
readings will be dwarfed by vibration inputs.
6. To eliminate residual readings, perform the following procedure. With the vibration
probe BNC plug seated in the socket on the top of the meter, use the REC/ENTER button
to select any of the three acceleration (“ACC”) settings. Keeping the vibration sensor
away from machinery and as motionless as possible, press the LOGGER ▲ button and
hold it for at least five seconds, until the display reads zero.
Whenever the meter is in any measurement mode, you can turn off the backlight (which is
on by default) by briefly pressing (but not holding) the POWER/ESC button. To reactivate the
backlight, briefly press the button again.
Whenever the instrument is in any measurement mode, you also can check the current
date and time by briefly pressing the SET ▼ button (which has the words “Time check”
stenciled below it). Doing so causes both values to appear briefly at the lower left of the
display.
HOLDING AND STORING MEASUREMENTS (RMS VALUES ONLY)
1. To hold a measured value, press the FUNC./HOLD/NEXT button during the
measurement. Doing so will cause the word “HOLD” to appear at the top of the display.
Pressing the FUNC./HOLD/NEXT button again releases the hold.
2. To record and recall readings, press the REC/ENTER button while making
measurements. This will make the term “REC” appear at the top of the display. Pressing
the REC/ENTER button again, briefly, will make the term “MAX” appear to the right of
“REC” and switch the display to the maximum value stored in memory during the last
recording session. Pressing the REC/ENTER button again, briefly, will make the term
“MIN” appear to the right of “REC” and switch the display to the minimum value stored
during the last session.
3. To exit recording mode, press the REC/ENTER button and hold it for at least three
seconds, until the term “REC” disappears from the top line of the display. The display will
then revert to showing the current reading.
8
Large machines on heavy foundations
(Group G)
Good 0 to 1.80 mm/s
Acceptable 1.81 to 4.50 mm/s
Still permissible 4.51 to 11.2 mm/s
Dangerous > 11.2 mm/s
Largest machines and turbo machines
with a special foundations (Group T)
Good 0 to 2.80 mm/s
Acceptable 2.81 to 7.10 mm/s
Still permissible 7.11 to 18.0 mm/s
Dangerous > 18 mm/s