Operating Manual for COMMUNICATIONS SERVICE MONITOR

Routine maintenance
Ventilation fan and filter
OPERATING MANUAL 2945A
The ventilator fan on the rear of the Service Monitor is fitted with a filter to prevent the ingress of
foreign matter into it. This should be inspected and cleaned at regular intervals. The procedure for
this is as follows:-
Disconnect the Service Monitor from the mains supply and from any DC supply.
Remove any other connections to the Service Monitor.
WARNING Failing to disconnect the power source before removing the filter could result in the fan
becoming switched on accidentally.
Stand the Service Monitor face down on a firm, non-scratch flat surface so that it is supported on
the front handles.† The rear of the Service Monitor, with the fan housing, should be at a safe and
accessible working height.
Remove the two M4 screws holding the fan filter to the rear of the Service Monitor and lift the
filter away.
Take the filter to a suitably ventilated location and remove as much dust and other foreign matter as
is practical. Do not wet or wash the filter.
Refit the filter to the Service Monitor, using the reverse procedure as appropriate.
If the filter is damaged or blocked, a replacement is available as IFR part No. 35907/675.
† If the bail arm carrying handle has been fitted, this should be positioned over
the top of the Service Monitor before standing the instrument face down,
supported on the front bumpers.
Routine safety testing and inspection
In the UK the ‘Electricity at Work Regulations’ (1989) section 4(2) places a requirement on the
users of equipment to maintain it in a safe condition. The explanatory notes call for regular
inspections and tests together with a need to keep records.
The following electrical tests and inspection information is provided for guidance purposes and
involves the use of voltages and currents that can cause injury. It is important that these tests are
only performed by competent personnel.
Prior to carrying out any inspection and tests the Service Monitor must be disconnected from the
mains supply and all external signal connections removed. All tests should include the Service
Monitor’s own supply lead, all covers must be fitted and the supply switch must be in the ‘ON’
position.
The recommended inspection and tests fall into three categories and should be carried out in the
following sequence:
1. Visual inspection
2. Earth Bonding Test (Class I equipment only)
3. Insulation Resistance test.
1. Visual inspection
A visual inspection should be carried out on a periodic basis. This interval is dependent on the
operating environment, maintenance and use, and should be assessed in accordance with guidelines
issued by the Health and Safety Executive (HSE). As a guide, this Service Monitor, when used
indoors in a relatively clean environment, would be classified as ‘low risk’ equipment and hence
should be subject to safety inspections on an annual basis. If the use of the equipment is contrary
to the conditions specified, you should review the safety re-test interval.
As a guide, the visual inspection should include the following where appropriate:
46882-311D 2-11