User's Manual

B-4 HVM200 Manual
Short Term
Crest Factor
The CF measurement period is controlled by the Averaging time setting; a
new CF value is calculated and displayed at the end of each Averaging time
period. CF is not calculated if the Averaging time setting is SLOW.
Summed
Instantaneous
Acceleration
a
w
(t) = instantaneous, summed acceleration
a
wx
(t), a
wy
(t), a
wz
(t) = X, Y, and Z axis instantaneous acceleration
K
x,
K
y,
K
z
= X, Y, and Z axis Sum Factors
The HVM200 uses the formula above to calculate the instantaneous,
summed acceleration, a
w
(t). This value is then used to calculate a sum
quantity for the A
rms
,A
min
, A
max
, A
mp
, A
eq
, Peak, VDV, and PE. K factors
affect only sum value and not individual axis data.
Term Equation Description
CF
Peak
Arms
-------------=
K
x
a
wx
t 
2
K
y
a
wy
t 
2
+ K
z
a
wz
t 
2
+