Fluke 77 Series IV User manual
Model 77 Series IV
Digital Multimeter
Users Manual
Model 77 Series IV
Digital Multimeter
The Fluke Model 77 Series IV is a battery-powered, average
responding-rms indicating multimeter (hereafter "the Meter"), with
a 6000-count, 3 3/4-digit display, and a bar graph.
Safety Information
A Warning identifies conditions and procedures that are
dangerous to the user. A Caution identifies conditions and
procedures that can cause damage to the Product or the
equipment under test.
XW Warning
To prevent possible electrical shock, fire, or personal
injury.
•Use the Product only as specified, or the protection
supplied by the Product can be compromised.
•Comply with local and national safety codes. Use
personal protective equipment (approved rubber
gloves, face protection, and flame-resistant clothes)
to prevent shock and arc blast injury where
hazardous live conductors are exposed.
•Use Product-approved measurement category (CAT),
voltage, and amperage rated accessories (probes,
test leads, and adapters) for all measurements.
•Remove all probes, test leads, and accessories that
are not necessary for the measurement.
•Do not use test leads if they are damaged. Examine
the test leads for damaged insulation and measure a
known voltage.
Model 77 Series IV
Users Manual
•Do not use a current measurement as an indication
that a circuit is safe to touch. A voltage measurement
is necessary to know if a circuit is hazardous.
•Do not use the Product if it is damaged.
•Disable the Product if it is damaged.
•Do not use the Product above its rated frequency.
•Do not use in CAT III or CAT IV environments without
the protective cap installed on test probe. The
protective cap decreases the exposed probe metal to
<4 mm. This decreases the possibility of arc flash
from short circuits.
•Replace a blown fuse with exact replacement only for
continued protection against arc flash.
•Do not use the HOLD function to measure unknown
potentials. When HOLD is turned on, the display
does not change when a different potential is
measured.
•Attempting to make a measurement with a test lead in
an incorrect terminal might blow a fuse, damage the
Meter, and cause serious personal injury.
Symbols
Symbol Description Symbol Description
AC (Alternating Current) Fuse
DC (Direct Current) P Conforms to European Union directives
DC/AC ) Certified by CSA Group to North American
safety standards.
Earth T Double insulated
W WARNING. RISK OF DANGER. XWARNING. HAZARDOUS VOLTAGE. Risk of
electric shock.
Digital Multimeter
Unsafe Voltage
Symbol Description Symbol Description
Battery (Low battery when shown on display) Consult user documentation.
Certified by TÜV SÜD Product Service. ÃConforms to relevant South Korean EMC
Standards
Conforms to relevant Australian EMC standards
CAT II Measurement Category II is applicable to test and measuring circuits connected directly to utilization points (socket
outlets and similar points) of the low-voltage MAINS installation.
CAT III Measurement Category III is applicable to test and measuring circuits connected to the distribution part of the
building’s low-voltage MAINS installation.
CAT IV Measurement Category IV is applicable to test and measuring circuits connected at the source of the building’s low-
voltage MAINS installation.
Unsafe Voltage
During a voltage measurement, the Meter alerts you to the
presence of a potentially hazardous voltage. When the Meter
detects a voltage ≥30 V or a voltage overload (OL), the Y symbol
is displayed.
Test Lead Alert
To remind you to check that the test leads are in the correct
terminals, is momentarily displayed when you move the
rotary switch to or from the mA or A position.
Model 77 Series IV
Users Manual
Battery Saver (Sleep Mode)
The Meter enters the "Sleep" mode and blanks out the display if
there is no function change or button press for 20 minutes. To
disable the Sleep mode, hold down the yellow button while turning
the Meter on. The Sleep mode is always disabled in the MIN MAX
AVG mode and the AutoHOLD mode.
Terminals
.
FUSED
V
1
2
3
4
AIK01F.EPS
Item Description
1 Input terminal for AC and DC milliamp measurements to
400 mA.
2 Input terminal for AC and DC current measurements to
10 A.
3 Input terminal for voltage, continuity, resistance, diode
test, capacitance, and frequency measurements.
4 Common (return) terminal for all measurements.
Rotary Switch Positions
Switch
Position Measurement Function
Hz
AC voltage from 0.001 to 1000 V.
Frequency from 2 Hz to 99.99 kHz.
DC voltage from 1 mV to 1000 V.
mDC mV from 0.1 mV to 600 mV.
e
Ohms from 0.1 Ω to 50 MΩ.
Farads from 1 nF to 9999 μF.
R
Beeper turns on at <25 Ω and turns off at >250 Ω.
Diode test. Displays OL above 2.4 V.
mA
AC mA from 0.01 mA to 400 mA.
DC mA from 0.01 mA to 400 mA.
A
AC A from 0.001 A to 10 A.
DC A from 0.001 A to 10 A
>10.00 display flashes.
>20 A, OL is displayed.
Digital Multimeter
Display
Display
.
8
7
7
56
4
3
2
1
13
14 15
9
11
12
10
AIK02F.EPS
No. Symbol Meaning
1 Continuity test.
2 Diode test.
3 Negative readings.
4 Y Unsafe voltage. Voltage ≥30 V, or
volta
g
e overload
(
OL
)
5
AutoHOLD is enabled. Display holds
present reading until it detects new
stable input. Then the Meter beeps
and dis
p
la
y
s new readin
g
.
6
MAX , MIN,
AVG
MIN MAX AVG enabled.
Maximum, minimum, average, or
present reading.
7 nμ F, mVA,
Mke, kHz Measurement units.
No. Symbol Meaning
8 DC, AC Direct current, alternating current.
9 Low battery. Replace battery.
10 610000mV All possible ranges.
11 Bar graph Analog display.
12
Auto Range
Manual Range
The Meter selects the range with
the best resolution.
The user selects the range.
13 ± Bar graph polarity.
14 The input out of range.
15
WTest lead alert. Displayed when
the rotary switch is moved to or
from the mA or A position.
Error Messages
Replace the battery immediately.
In the capacitance function, too much electrical
charge is present on the capacitor being tested.
Invalid EEPROM data. Have Meter serviced.
Invalid calibration data. Calibrate Meter.
Model 77 Series IV
Users Manual
MIN MAX AVG Recording Mode
The MIN MAX AVG recording mode captures the minimum and
maximum input values, and calculates a running average of all
readings. When a new high or low is detected, the Meter beeps.
Note
For dc functions, accuracy is the specified accuracy of the
measurement function
±
12 counts for changes longer than
350 ms in duration.
For ac functions, accuracy is the specified accuracy of the
measurement function
±
40 counts for changes longer than
350 ms in duration.
To use MIN MAX AVG recording:
•Make sure that the Meter is in the desired measurement
function and range. (Autoranging is disabled in the MIN MAX
AVG mode.)
•Press MIN MAX to activate MIN MAX AVG mode.
and MAX light, and the highest reading detected since
entering MIN MAX AVG is displayed.
•Press MIN MAX to step through the low (MIN), average (AVG),
and present readings.
•To pause MIN MAX AVG recording without erasing stored
values, press HOLD. is displayed.
•To resume MIN MAX AVG recording, press HOLD again.
turns off.
•To exit and erase stored readings, press MIN MAX for 1 second
or turn the rotary switch.
AutoHOLD Modes
XWWarning
To avoid electric shock, do not use the AutoHOLD mode
to determine if a circuit is live. Unstable or noisy
readings will not be captured.
In the AutoHOLD mode, the Meter holds the reading on the display
until it detects a new stable reading. Then the Meter beeps, and
displays the new reading.
•Press HOLD to activate AutoHOLD. lights.
•Press HOLD again or turn the rotary switch to resume normal
operation.
YELLOW Button
Press the yellow button to select alternate measurement functions
on a rotary switch setting, e.g., to select DC mA, DC A, Hz,
capacitance, or diode test.
Display Backlight
Press to toggle the backlight on and off. The backlight
automatically turns off after 2 minutes.
Digital Multimeter
Manual Ranging and Autoranging
Manual Ranging and Autoranging
The Meter has both Manual range and Autorange modes.
•In the Autorange mode, the Meter selects the range with the
best resolution.
•In the Manual Range mode, you override Autorange and select
the range yourself.
When you turn the Meter on, it defaults to Autorange and Auto
Range is displayed.
1. To enter the Manual Range mode, press RANGE.
Manual Range is displayed.
2. In the Manual Range mode, press RANGE to increment the
range. After the highest range, the Meter wraps to the lowest
range.
Note
You cannot manually change the range in the MIN MAX
AVG mode.
If you press RANGE while in MIN MAX AVG, the Meter
beeps twice, indicating an invalid operation, and the range
does not change.
3. To exit Manual Range, press RANGE for 1 second or turn the
rotary switch.
The Meter returns to Autorange and Auto Range is displayed.
Power-Up Options
To select a Power-Up Option, hold down the button indicated while
turning the Meter on.
Power-Up Options are cancelled when the Meter is turned OFF.
Button Power-Up Options
Turns on all display segments when in VAC switch
position.
Disables beeper. is diplayed when enabled.
Enables "Smoothing" mode. is displayed when
enabled.
Dampens display fluctuations of rapidly changing
inputs by digital filtering.
(YELLOW)
Disables automatic power-down ("Sleep mode").
is displayed when enabled
Sleep mode is also disabled while the Meter is in a
MIN MAX AVG Recording mode, or the AutoHOLD
mode.
Disables automatic 2-minute backlight timeout.
is displayed when enabled.
Model 77 Series IV
Users Manual
Making Basic Measurements
The figures on the following pages show how to make basic
measurements.
When connecting the test leads to the circuit or device, connect
the common (COM) test lead before connecting the live lead;
when removing the test leads, remove the live lead before
removing the common test lead.
XWWarning
To avoid electric shock or injury, or damage to the
Meter, disconnect circuit power and discharge all high-
voltage capacitors before testing resistance, continuity,
diodes, or capacitance.
Measuring AC and DC Voltage
_
+_
+
Volts AC Volts DC Millivolts DC
VVmV
RANGEHOLD
MIN MAX
RANGEHOLD
MIN MAX
RANGEHOLD
MIN MAX
AIK03F.EPS
Measuring Resistance
RANGEHOLD
MIN MAX
AIK04F.EPS
Measuring Capacitance
+_
+
RANGEHOLD
MIN MAX
AIK05F.EPS
Digital Multimeter
Making Basic Measurements
Testing for Continuity
RANGEHOLD MIN MAX RANGEHOLD MIN MAX
AIK06F.EPS
Testing Diodes
+__
Forward Bias
Single Beep
+
Reverse Bias
Good Diode Good Diode
_
+
Shorted
and
Bad Diode
Open
_
CAT
+
Bad Diode
RANGEHOLD
MIN MAX
RANGEHOLD
MIN MAX
RANGEHOLD
MIN MAX
RANGEHOLD
MIN MAX
AIK07F.EPS
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