Applications; Voltage, Ac/Dc; Current, Ac/Dc - Fluke 27 User Manual

27
Users Manual
X Beeper (not illustrated)
The beeper can produce beeps, clicks, or a continuous
tone. It is used for audible indication in the diode test
mode, when operating the push buttons, and when a new
reading is displayed in the Touch Hold
Tilt Bail Adjustment
To use the tilt bail as a handle, lift the bail slightly (about
1 inch or 2.5 cm), pull the ends out and insert the ends in
the alternate set of holes.

Applications

Voltage, AC/DC

All ranges present an input impedance of approximately
10 megohms in parallel with less than 100 pF.
Measurement errors, due to circuit loading, can result
when making either ac or dc voltage measurements on
circuits with high source resistance. However, in most
cases the error is negligible (0.1% or less) if the
measurement circuit source resistance is 10 kilohms or
less.
When measuring voltages above 320 V in Touch Hold
mode, use manual ranging to minimize readings of stray
voltages.
8
®
mode.
®

Current, AC/DC

WWarning
To avoid electric shock or personal injury:
•
Never attempt an in-circuit current
measurement where the open-circuited
potential to earth is greater than 1000 V.
•
Before measuring current, check the
meter's fuses (see "Testing the Fuses").
•
Turn off circuit power before connecting
the meter in the circuit. Remember to
place the meter in series with the
current. Use proper terminals, function,
and range for your measurement.
To prevent arc blast and resulting injury,
install only the EXACT replacement fuse
listed in the Maintenance section.
All current ranges are fuse protected. Approximate
terminal resistances for the current ranges are: 0.1 ohms
for A, 5.6 ohms for mA, and 500 ohms for µA. The
voltage developed across the terminal resistance is
specified as burden voltage. If a fuse opens, refer to the
fuse replacement procedures in the Operator
Maintenance section of this manual.