2022-07
file: spotwave_instructions_manual.docx
30 of 50
<type>
H
for hit,
S
for status data
temp
device temperature in °C
T
time period since start data acquisition in tics. The conversion into µs is done the following way:
𝑇
µ𝑠
=
𝑇
𝑓
𝑠
⋅
10
6
=
𝑇
2
A
peak amplitude as ADC value. The conversion to µV is done the following way:
𝐴
µ𝑉
=
𝐴 ⋅ 〈𝑎𝑎𝑎
2
𝑢𝑢〉
R
rise time in tics. The conversion in µs is done the following way:
𝑅
µ𝑠
=
𝑅
𝑓
𝑠
⋅
10
6
=
𝑅
2
D
duration in tics. The conversion in µs is done the following way:
𝐷
µ𝑠
=
𝐷
𝑓
𝑠
⋅
10
6
=
𝐷
2
C
counts (number of positive threshold crossings)
E
energy in ADC values, that is
E
is the sum of squared ADC values. The conversion factor to
engineerign units of [µV² s] is
𝐸�
[
µ𝑉
2
𝑠
] =
𝐸 ⋅ 〈𝑎𝑎𝑎
2
𝑢𝑢〉
2
1
𝑓
𝑠
Vallen Systeme software uses arbitrary energy units [eu]. A conversion to energy units is done the following
way:
𝐸
𝑒𝑒
=
𝐸� ⋅ 𝛼
⋅ 𝛽
𝑒𝑒
with the scaling factor
𝛼
= 10
6
for converting seconds into microseconds.
TRAI
transient recorder index (link between AE and TR data)
flags
hit flags
RMS Calculation
The RMS value can be computed from the energy and the duration. For status data and AE data recorded in
countinuous mode this is:
𝑅𝑅𝑆
µ𝑉
=
�
1
𝐷
µ𝑠
⋅
𝐸
𝑒𝑒
𝛽
𝑒𝑒
In the case of event based recording, the time window in which the energy is measured is of length duration of
the burst plus the duration discrimination time:
𝑅𝑅𝑆
µ𝑉
=
�
𝐸
𝑒𝑒
𝐷
µ𝑠
+
𝐷𝐷𝑇
µ𝑠
⋅
1
𝛽
𝑒𝑒
The conversion factor
〈
adc2uv
〉
is available via the
get_info
or
get_setup
command. The
conversion factor depends on the input range and gain.
