39
Subject to change without notice
may be periodic or non-periodic. The amplitude of transients
increases with decreasing distance from their source.
CAT IV: Measurements at the source of a low voltage supply,
e.g. at electricity meters.
CAT III: Measurements inside a building, e.g. at distribution
sites, power switches, permanently installed mains
outlets, permanently mounted motors etc.
CAT II: Measurements in circuits which are directly connected
with the low voltage supply, e.g. household appliances,
portable tools etc.
CAT I: Electronic instruments and circuits which contain
circuit breakers resp. fuses.
Proper operating conditions
Operation in the following environments: industry, business and
living quarters, small industry. The instruments are intended
for operation in dry, clean environments. They must not be ope-
rated in the presence of excessive dust, humidity, nor chemical
vapours in case of danger of explosion.
The maximum permissible ambient temperature during ope-
ration is +10 to +40 deg. C. In storage or during transport the
temperature limits are: –40 to +70 deg. C. In case of exposure to
low temperature or if condensation is suspected, the instrument
must be left to stabilize for at least 2 hrs prior to operation.
In principle the instrument may be used in any position, however
suffi cient ventilation must be ensured. Operation for extended
periods of time requires the horizontal or tilted (handle) posi-
tion.
Nominal specifi cations are valid after 30 minutes warm-up at
23 deg. C. Specifi cations without tolerances are typical values
taken of average production units.
Warranty and Repair
HAMEG instruments are subjected to a rigorous quality control.
Prior to shipment each instrument will be burnt in for 10 hours.
Intermittent operation will produce nearly all early failures.
After burn in, a fi nal functional and quality test is performed to
check all operating modes and fulfi lment of specifi cations. The
latter is performed with test equipment traceable to national
measurement standards.
Statutory warranty regulations apply in the country where the
HAMEG product was purchased. In case of complaints please
contact the dealer who supplied your HAMEG product.
STOP
STOP
Maintenance
The instrument does not require any maintenance. Dirt may
be removed by a soft moist cloth, if necessary adding a mild
detergent. (Water and 1 %.) Grease may be removed with ben-
zine (petrol ether). Displays and windows may only be cleaned
with a moist cloth.
Do not use alcohol, solvents or paste. Under no
circumstances should any fl uid be allowed to get
into the instrument. If other cleaning fl uids are
used damage to the lacquered or plastic surfaces is
possible.
Mains voltage
A main voltage of 115 V and 230 V can be chosen. Please check
whether the mains voltage used corresponds with the voltage
indicated by the mains voltage selector
on the rear panel. If
not, the voltage has to be changed.
Line fuse
The instrument has 2 internal line fuses: T 0.2 A. In case of a
blown fuse the instrument has to be sent in for repair. A change
of the line fuse by the customer is not permitted.
Power switch
Normally the power switch
on the rear
panel of the instrument should be stay in
“ON“ position. If using the Standby-button
on the front panel, only the controls and the
display are turned off. The instrument itselfs
stays turned on as long as it is connected to
the supply voltage. This has the advantage
that the instrument is immediately functional
after turn-on. Also the reference voltage source will remain
energized, so any drift after turn-on will be eliminated, also
its long term drift will be substantially improved. To switch-off
the instrument completely, the power switch on the back panel
has to be operated.
If the instrument is left unattended for some time, the power
switch on the rear panel has to be operated. (Because of safety
reasons!)
I m p o r t a n t h i n t s
CAT IV
CAT III
CAT II
Premises
In-house
installation
Permanently installed
machinery, distribution sites,
power conductors, mains
outlets close to the CAT IV
installation
Mains outlets for
household appliances,
portable tools, PC,
refrigerator etc.
O
verhead lines
