Fluke 77 IV [12/18] Model 77 series iv users 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.

CAT

RANGEHOLD

MIN MAX

AIK08F.EPS

Measuring Frequency

XWWarning

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

AC Voltage Frequency

EOM09F.EPS

⇒ 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.