B+K precision 2165A, Instruction Manual, Page: 8 / 28

8
GENERAL INFORMATION
•
has been subjected to prolonged storage under
unfavorable conditions (e.g. in the open or in moist
environments)
•
has been subjected to severe transport stress (e.g. in
poor packaging).
Operating Conditions
The instrument has been designed for indoor use. The
permissible ambient temperature range during operation is
+10°C (+50°F) to +40°C (+104°F). It may occasionally be
subjected to temperatures b10°C (+50°F) and –
10°C (+14°F) without degrading its safety. The permissible
ambient temperature range for storage or transportation is –
40°C (+14°F) to +70°C (+158°F).
The maximum operating altitude is up to 2200m. The
maximum relative humidity is up to 80%.
If condensed water exists in the instrument it should be
acclimatized before switching on. In some cases (e.g.
instrument extremely cold) two hours should be allowed
before the instrument is put into operation. The instrument
should be kept in a clean and dry room and must not be
operated in explosive, corrosive, dusty, or moist
environments. The spectrum analyzer can be operated in any
position, but the convection cooling must not be impaired.
For continuous operation the instrument should be used in
the horizontal position, preferably tilted upwards, resting on
the tilt handle.
The specifications stating tolerances are only valid if the
instrument has warmed up for 60 minutes at an ambient
temperature b15°C (+59°F) and +30°C (+86°F).
Values without tolerances are typical for an average
instrument.
Maintenance
Various important properties of the spectrum analyzer
should be carefully checked at certain intervals. Only in this
way it is certain that all signals are displayed with the
accuracy on which the technical data are based.
The exterior of the instrument should be cleaned regularly
with a dusting brush. Dirt which is difficult to remove on the
casing and handle, the plastic and aluminum parts, can be
removed with a moistened cloth (99% water + 1% mild
detergent). Spirit or washing benzene (petroleum ether) can
be used to remove greasy dirt.
The screen may be cleaned with water or washing benzene
(but not with spirit (alcohol) or solvents), it must then be
wiped with a dry clean lint-free cloth. Under no
circumstances may the cleaning fluid get into the instrument.
The use of other cleaning agents can attack the plastic and
paint surfaces.
Selecting the Line Voltage
The spectrum analyzer operates at mains/line voltages of
115V AC and 230V AC. The voltage selection switch is
located on the rear of the instrument and displays the
selected voltage. The correct voltage can be selected using a
small screwdriver.
Remove the power cable from the power connector prior to
making any changes to the voltage setting. The fuses must
also be replaced with the appropriate value (see
Fuse Type )
prior to connecting the power cable. Both fuses are
externally accessible by removing the fuse cover located
above the 3-pole power connector.
The fuseholder can be released by pressing its plastic
retainers with the aid of a small screwdriver (see Figure 2).
The retainers are located on the right and left side of the
holder and must be pressed towards the center. The fuse(s)
can then be replaced and pressed in until locked on both
sides.
Use of patched fuses or short-circuiting of the fuseholder is
not permissible;
B+K Precision assumes no liability
whatsoever for any damage caused as a result, and all
warranty claims become null and void.
Fuse type:
Size 5 x 20 mm; 250-Volt AC; must meet IEC specification
127, Sheet III (or DIN 41 662 or DIN 41 571, sheet 3).
Time characteristic:
time-lag
Line voltage
115V~ ±10%: Fuse rating: T 315mA
Line voltage 230V~ ±10%: Fuse rating: T 160mA
Fig. 2. Fuse Replacement