Larson Davis SoundTrack LxT, User Manual

Page: 271 / 307

B
-
12 LxT1
LxT Manual
f) Linear Measurement Starting Level
The starting point for measuring level linear errors on the reference range is 114 dB.
g) Electrical Insert Signals
The electrical design of the input device to insert electrical signals into the preamplifier for the
377B02 microphone is a series 12pF ± 5% capacitor. The Larson Davis ADP076 is used for this
purpose. The ADP076 can be used for noise floor measurements by attaching the included short on the
front of the ADP076.
h) Inherent Noise
Inherent Noise of the LxT1 (low range) with PRMLxT1L:
1
combination of the electronic noise and the thermal noise of the microphone at 20°C measured in a
sealed cavity and vibration isolated
2
electronic noise of the instrument with an ADP090 in place of the microphone
i) Highest Sound Pressure Level
The highest sound pressure level the Larson Davis LxT1 is designed to accommodate at the level of
overload is 140 dB. The peak-to-peak voltage at this level is 28 Vpp input through the ADP005.
j) Battery Power Voltage Range
The battery power supply voltage range for which the LxT1 conform to this standard:
6.4 Volts maximum
The LxT will shut down if the battery is below 4.0 Volts when used with alkaline batteries. Therefore
from 4.0 to 6.4 Volts is the usable range of battery voltage.
k ) Display Device
The display device will display all levels over the entire linear operating range.
Weighting
Total Noise
1
Electrical Noise
2
A 19 12
C 21.2 17
Flt 27.5 25