Fluke 77 - Current and Frequency Measurement; Measure AC or DC Current; Measure Frequency

Model 77 Series IV
Users Manual
8
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.
CAT
CAT
+
+
RANGEHOLD
MIN MAX
mA
A
DC
AIK08F.EPS
Measuring Frequency
X Warning
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.
+
RANGEHOLD
MIN MAX
Hz
V
AC Voltage Frequency
EOM09F.EPS
µ To exit frequency, press yellow button or turn the rotary
switch.
µ In frequency, the bar graph shows the ac voltage accurately
up to 1 kHz.
µ Select progressively lower ranges using manual ranging for a
stable reading.