SAFETY PRECAUTIONS
The following safety precautions should be observed before operating the Model 617
This instrument is intended for use by qualified personnel who recognize shock hazards and are familiar with the
safety precautions required to avoid possible injury. Read over the manual carefully before operating this instru-
ment.
Exercise extreme caution when a shock hazard is present at the instrument’s input. The American National Stan-
dards Institute (ANSI) states that a shock hazard exists when voltage levels greater than 30V rms or 42.4V peak
are present. A good safety practice is to expect that a hazardous voltage is present in any unknown circuit before
measuring.
Do not exceed 5oOV peak between input low and earth ground. Do not connect PREAh4P OUT, COM, OI
2V ANALOG OUTPUT to earth ground when floating input.
Inspect the test leads for possible wear, cracks or breaks before each use. If any defects are found, replace with test
leads that have the same measure of safety as those supplied with the instrument.
For optimum safety do not touch the test leads or the instrument while power is applied to the circuit under test.
Turn the power off and discharge all capacitors, before connecting or disconnecting the instrument.
Do not touch any object which could provide a current path to the common side of the circuit under test or power
line (earth) ground. Always make measurements with dry hands while standing on a dry, insulated surface,
capable of withstanding the voltage being measured.
Do not exceed the instrument’s maximum allowable input as defined in the specifications and operation section.
Safe operation and good measurement practice dictates use of an external resistor when necessary to limit input
currents to less than 30mA.
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