Measuring Ac Or Dc Current; Measuring Frequency - Fluke 77 User Manual

Model 77 Series IV
Users Manual

Measuring AC or DC Current

XWWarning
To avoid personal injury or damage to the Meter:
• Never attempt to make an in-circuit current measure-
ment when the open-circuit potential to earth ground
is 1000 V.
• Check the Meter's fuses before testing. (See "Testing
the Fuses".)
• Use the proper terminals, switch position, and range
for your measurement.
• Never place the probes in parallel with a circuit or
component when the leads are plugged into the
current terminals.
Turn power OFF, break circuit, insert Meter in series, turn power
on.
8
DC
HOLD MIN MAX RANGE
mA
A
+
CAT
CAT
+
AIK08F.EPS

Measuring Frequency

X
To avoid electrical shock, disregard the bar graph for
frequencies >1 kHz. If the frequency of the measured
signal is >1 kHz, the bar graph is unspecified.
The Meter measures the frequency of a signal. The trigger level is
0 V ac for all ranges.
AC Voltage Frequency
HOLD
V
+
To exit frequency, press yellow button or turn the rotary
switch.
In frequency, the bar graph shows the ac voltage accurately
up to 1 kHz.
Select progressively lower ranges using manual ranging for a
stable reading.
Warning
Hz
MIN MAX RANGE
EOM09F.EPS