B&K Precision 1655A - Manual - Manual (Page 14)

12
SAFETY
The Model 1655A and 1653A AC Power Supplies are sources
of high voltage ac. Improper or careless use could result in fatal
electrical shock. The most commonly encountered conditions
which may pose a shock hazard are identified and corresponding
precautions listed in the TEST INSTRUMENT SAFETY section
which starts on the side front cover of this manual. Know and
observe these precautions.
Although Model 1655A is equipped with dual isolated outlets,
only one “hot Chassis” equipment should be connected at a time.
Unless the line-to-chassis relationship is identical, a shock hazard
will exist between the two chassis.
INPUT POWER
These instruments are intended for use only with 120 volt,
60Hz line voltage. Do not operate from 50Hz, or 220-240 volt
power systems. The instrument may be safely operated from 100
volt, 60Hz line voltage, although the maximum output voltage
will be lower.
VENTILATION
The holes in the case provide convection cooling (hot air rises
and escapes through the top vents, while cool air is drawn in to
replace it through the bottom). Never block these ventilation
holes with a manual, schematic diagram, other equipment, etc. If
the air is blocked, the temperature inside the ac power supply may
become excessive and cause failure of the unit. Similarly, avoid
operating locations near sources of heat.
MAXIMUM OUTPUT VOLTAGE
Exceeding the maximum input voltage rating of the equipment
under test (typically 130VAC) may cause severe damage to the
equipment.
The output voltage of the ac power supply is adjustable from 0
to 150VAC. This is very useful in certain testing situations for
stressing equipment beyond its normal operating range to
determine its breakdown point. However, for most testing and
servicing applications, input voltages higher than the maximum
specified by the manufacturer should be used with great
precaution.
For normal testing and servicing, check the maximum input
voltage specification of the equipment under test and make sure
you do not adjust the output voltage of the ac power supply
higher than that value. Most ac powered equipment has a
maximum input voltage rating of 130VAC. If unsure of the
maximum rating, do not exceed 130 VOLTS. On Model 1655A,
the 130-150 volt portion of the VOLTS scale is red as a reminder
that caution should be observed.
OPERATING INSTRUCTIONS
PRECAUTIONS
CAUTION