Rohde & Schwarz Hameg HM8112-3 Manual Download Page 39

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Subject to change without notice

short, fast, and fast-rise changes of voltage or current, and

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.

1.8 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 +5 °C to +40 °C. In storage or during transport the

temperature limits are: –20 °C to +70 °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

sufficient ventilation must be ensured. Operation for extended

periods of time requires the horizontal or tilted (handle) position.

Nominal specifications are valid after 30 minutes warm-up at

23 deg. C. Specifications without tolerances are typical values

taken of average production units.

1.9 Warranty and repair

Our instruments are subject to strict quality controls. Prior to

leaving the manufacturing site, each instrument undergoes a

10-hour burn-in test. This is followed by extensive functional

quality testing to examine all operating modes and to guarantee

compliance with the specified technical data. The testing is

performed with testing equipment that is calibrated to national

standards. The statutory warranty provisions shall be governed

by the laws of the country in which the product was purchased.

In case of any complaints, please contact your supplier.

Any adjustments, replacements of parts, maintenance and

repair may be carried out only by authorized technical person-

nel. Only original parts may be used for replacing parts relevant

to safety (e.g. power switches, power transformers, fuses). A

safety test must always be performed after parts relevant to

safety have been replaced (visual inspection, PE conductor test,

insulation resistance measurement, leakage current measure-

ment, functional test). This helps ensure the continued safety

of the product.

1.10 maintenance

Before cleaning please make sure the instrument

is switched off and disconnected from all power

supplies.

Clean the outer case using a dust brush or a soft, lint-free dust

cloth at regular intervals.

no part of the instrument should be cleaned by the

use of cleaning agents (as f.e. alcohol) as they may

adversely affect the labeling, the plastic or lac-

quered surfaces.

The display can be cleaned using water or a glass cleaner (but

not with alcohol or other cleaning agents). Thereafter wipe the

surfaces with a dry cloth. No fluid may enter the instrument.

Do not use other cleaning agents as they may adversely affect

the labels, plastic or lacquered surfaces.

1.11 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.

1.12 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.

1.13 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!)

the

product may only be opened by authorized

and qualified personnel. Prior to working on the

product or before the product is opened, it must be

disconnected from the Ac supply network. other-

wise, personnel will be exposed to the risk of an

electric shock.

i m p o r t a n t h i n t s