Larson Davis HVM100, Manual

Page: 45 / 174

4/11/03 Range Menu 4-1
C H A P T E R
4
Range Menu
The
RANGE
key functions are concerned with the level of
input signals coming into the HVM100.
Range Key
In this menu, Gain is added, Calibration is performed, Auto-
Ranging is enabled, and Accelerometer Sensitivity is
entered.
Auto Range
Hint: This setting is in the Range menu. To access the Range menu press the
RANGE key and then use the
u
and
d
arrow keys to navigate
through the menu items.
The Auto-Range function in the HVM100 is designed to
work with a steady state signal. It is not meant for use while
taking data. Before enabling this function, the transducer
should be attached to the steady state vibration to be mea-
sured. Next, find the Auto-Range display, located in the
Range menu. Press the
c
key to enable auto-ranging. The
HVM100 will use its Auto-Range algorithm to adjust the
gain for all three channels such that the steady state input
signal can be properly measured by the HVM100. (The gain
is adjusted so that the signal falls within the top 20 dB of the
HVM100’s analog to digital converter’s range.)
A u t o - R a n g e
X = 0 Y = 0 Z = 0