16
lighting sources.
Availability of unmodulated signal within the range of dozens of kHz can be caused by radiation of the
display of the computer.
6.5 LOW FREQUENCY DIFFERENTIAL AMPLIFIER CHANNEL
The main types of wire lines for the analysis in this channel are the line of fire, security alarm
systems and telephone lines. Maximum operating voltage is 110V, the maximum allowable - 250V.
Check the availability of signals by using of sound control and viewing of the scale signal level.
Additionally analyze signals through oscilloscopes and spectrum analyzers. To increase common-mode
rejection, use fine-tuning adjustment, located at ST131.AWL.
Visually (reading the scale) and aurally, estimate the level of magnetic field from the spots or
appliances held suspect. Check/search for office equipment, telephones, dynamic heads of acoustic
systems, sound recording devices (Dictaphones) etc.
The main types of lines to be researched in this mode are the lines of fire alarm and security alert,
and telephone lines.
TO AVOID PHYSICAL INJURY AND KEEP THE DEVICE FROM DAMAGE, DO NOT CONNECT TO LINES WITH
VOLTAGES OVER 70V
Select suitable extensions, depending on the line, and connect them to the probes. Plug the
connecting cable into the socket, and connect the probes to the line. Check if there are any suspect
signals.
6.6 LOW FREQUENCY MAGNETIC FIELD DETECTOR CHANNEL
Visually (reading the scale) and aurally, estimate the level of magnetic field from the spots or
appliances held suspect. Check/search for office equipment, telephones, dynamic heads of acoustic
systems, sound recording devices (Dictaphones) etc.
6.7 ACOUSTIC TRANSDUCER CHANNEL
Plug the acoustic sensor "ST034.A" into the socket.
Activate a test sound source in the area under check, set the volume to that of loud speech.
At different locations in the adjoining areas, estimate the outside level of the test sound signal.
This will allow to evaluate risks of speech interception outside the enclosed area. In the mode of octave
filters, ‘exposed’ segments of the spectrum can be identified with more precision.
With the aid of this channel, sound insulation of enclosed areas can be evaluated.
7 SOFTWARE UPGRADES
Connect the ST034 to a computer using a USB cable (power switch is in the "0"). After connection
the USB drivers will be installed automatically. Press "3" button and hold it, turn the power switch to "I".
Release the "3". The display «ST 034" should turn on lights and do nothing until the program is loaded. If
for some reason the download operation failed, the program will offer to try again.
8 RESTRICTIONS AND RECOMMENDATIONS
8.1 The ST 034 set should only be transported and stored in the standard bag.
Store in enclosed areas with heating, at ambient temperatures from +10 to +35
o
C and up to 80%
humidity.
When transporting the set, care shall be taken to avoid shocks or pressure to the standard packaging.
8.2 After the device has been subjected to temperatures below –5
o
C for more than 4 hours, before
switching it on, make sure there is no moisture adsorbed, or wait until it evaporates.
