32
2.2 Connecting Power
Observe the following to avoid damaging the meter:
• When using an external power source such as a battery, con-
nect the positive (center) conductor of the external power cable
to the "+" battery terminal.
• Remove the batteries when operating from external power.
When the batteries are installed, the meter will turn on even if
the polarity of the external power is reversed, damaging the
meter.
• If the device under test is earth grounded, connect the negative
conductor to earth.
(Example: Indoor and outdoor line measurements R connect the
negative conductor to earth)
• If the device under test uses a ground level that is isolated from
earth, connect the negative conductor to the ground level used.
(Example: In a mobile installation, if the device under test is
grounded to the vehicle chassis R connect the negative conduc-
tor to the chassis)
• Make sure the power is turned off before connecting or discon-
necting the external power cable.
• When using the external power, note that current of approxi-
mately 3 mA is consumed regardless of whether the power
switch of the 3290-10 is on or off.
• While operating from the external power, the remaining battery
charge indicator (bar graph) indicates the loaded output volt-
age (about 6V) of the external power. Although this may not
display as 100%, measurements are unaffected. However,
proper operation cannot be guaranteed if external power drops
below 8.4 V.
• Please observe the following if providing your own external
power cable.
• An external power cable longer than about 3m may introduce
undesirable environmental EMC effects such as noise emission.
Plug
Battery
φ
12 or less
9.5
φ
1.7
φ
4.75
Содержание 3290-10
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Страница 54: ...48 3 6 Measuring Duty by Timer...
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