Thank you for purchasing the HIOKI "3804
DIGITAL HiTESTER". To obtain maximum
performance from the product, please read this
manual first, and keep it handy for future reference.
Inspection
When you receive the product, inspect it carefully to
ensure that no damage occurred during shipping. If
damage is evident, or if it fails to operate according
to the specifications, contact your dealer or Hioki
representative.
Accessories
3851-10 TEST LEAD (a pair) 1
Protective holster 1
Instruction Manual 1
6F22 manganese battery 1
(built into this unit, for monitor)
i
____________________________________________
Introduction
ii
_______________________________________________
Safety Notes
WARNING
This product is designed to conform to IEC 61010
Safety Standards, and has been thoroughly tested
for safety prior to shipment. However,
mishandling during use could result in injury or
death, as well as damage to the product. Be
certain that you understand the instructions and
precautions in the manual before use. We
disclaim any responsibility for accidents or
injuries not resulting directly from product
defects.
____________________________________________
Safety Notes
_______________________________________________
This manual contains information and warnings
essential for safe operation of the product and for
maintaining it in safe operating condition. Before
using the product, be sure to carefully read the
following safety notes.
Safety symbols
Thesymbol printed on the product
indicates that the user should refer to
a corresponding topic in the manual
(marked with the
symbol) before
using the relevant function.
In the manual, thesymbol indicates
particularly important information that
the user should read before using the
product.
Indicates a double-insulated device.
Indicates DC (Direct Current).
Indicates AC (Alternating Current).
Indicates both DC and AC.
Indicates grounding terminal.
Indicates that dangerous voltage may be
present at this terminal.
iii
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Safety Notes
iv
_______________________________________________
The following symbols in this manual indicate the
relative importance of cautions and warnings.
Indicates that incorrect operation
DANGER
presents an extreme hazard that could
result in serious injury or death to the
user.
Indicates that incorrect operation
WAR NING
presents a significant hazard that could
result in serious injury or death to the
user.
Indicates that incorrect operation
CAUTION
presents a possibility of injury to the
user or damage to the product.
Advisory items related to performance
NOTE
or correct operation of the product.
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Safety Notes
_______________________________________________
We define measurement tolerances in terms of f.s.
(full scale), rdg. (reading) and dgt. (digit) values,
with the following meanings:
f.s. (maximum display value or scale length)
The maximum displayable value or the full length of
the scale. This is usually the maximum value of the
currently selected range.
rdg. (reading or displayed value)
The value currently being measured and indicated
on the measuring product.
dgt. (resolution)
The smallest displayable unit on a digital measuring
product, i.e., the input value that causes the digital
display to show a "1".
v
____________________________________________
Safety Notes
vi
_______________________________________________
Measurement categories (Overvoltage
categories)
This product conforms to the safety requirements for
CAT II (1000V), CATIII (600V) measurement
products.
To ensure safe operation of measurement product,
IEC 61010 establishes safety standards for various
electrical environments, categorized as CAT I to
CAT IV, and called measurement categories. These
are defined as follows.
CAT I : Secondary electrical circuits connected to
an AC electrical outlet through a
transformer or similar device.
CAT II : Primary electrical circuits in equipment
connected to an AC electrical outlet by a
power cord (portable tools, household
appliances, etc.)
CAT III : Primary electrical circuits of heavy
equipment (fixed installations) connected
directly to the distribution panel, and
feeders from the distribution panel to
outlets.
CAT IV : The circuit from the service drop to the
service entrance, and to the power meter
and primary overcurrent protection device
(distribution panel).
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Safety Notes
_______________________________________________
Higher-numbered categories correspond to electrical
environments with greater momentary energy. So a
measurement device designed for CAT III
environments can endure greater momentary energy
thanadevicedesignedforCATII.
Using a measurement product in an environment
designated with a higher-numbered category than
that for which the product is rated could result in a
severe accident, and must be carefully avoided.
Never use a CAT I measuring product in CAT II,
III, or IV environments.
The measurement categories comply with the
Overvoltage Categories of the IEC60664 Standards.
vii
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Safety Notes
viii
_______________________________________________
Notes on Use
Follow these precautions to ensure safe operation
and to obtain the full benefits of the various
functions.
Preliminary Check
Before using the product the first time, verify that it
operates normally to ensure that the no damage
occurred during storage or shipping. If you find any
damage, contact your dealer or Hioki representative.
WARNING
Do not use the product where it may be
exposed to corrosive or combustible gases.
The product may be damaged or cause an
explosion.
Before using the product, make sure that the
insulation on the test leads is undamaged and
that no bare conductors are improperly
exposed. Using the product under such
conditions could result in electrocution.
Replace the test leads with the specified Hioki
Model 3851-10.
____________________________________________
Notes on Use
_______________________________________________
CAUTION
To avoid damage to the product, do not allow the
product to get wet, and do not use it when your
hands are wet.
Adjustments and repairs should be made only by
technically qualified personnel.
This product should be installed and operated indoors
only, between 0 and 40
However, it can be safely operated down to -10
and 80% RH or less.
.
Do not store or use the product where it could be
exposed to direct sunlight, high temperature or
humidity, or condensation. Under such conditions, the
product may be damaged and insulation may
deteriorate so that it no longer meets specifications.
This product is not designed to be entirely water- or
dust-proof. To avoid damage, do not use it in a wet or
dusty environment.
Do not use the product near a device that generates
a strong electromagnetic field or electrostatic charge,
as these may cause erroneous measurements.
To avoid damage to the product, protect it from
vibration or shock during transport and handling, and
be especially careful to avoid dropping.
If the protective functions of the product are
damaged, either remove it from service or mark it
clearly so that others do not use it inadvertently.
ix
____________________________________________
Notes on Use
x
_______________________________________________
NOTE
To avoid corrosion from battery leakage, remove the
batteries from the product if it is to be stored for a
long time.
____________________________________________
Notes on Use
_______________________________________________
Chapter 1
Overview
1.1 Product Overview
This multimeter has DCV, ACV, DCA, ACA,
OHM, Diode check, Audible continuity, Capacitor
and % of 4-20 mA tests.
The built-in optical RS-232C will assist you to
capture the data without hazardous as the high
voltage has been measured.
1
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Chapter 1 Overview
2
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1.2 Features
The multimeter is shown in the following Figure.
This meter has a lot of functions can be used in
HVAC, Power, Process fields, Electronic/Electrical
system diagnostics and troubleshooting. It will be
the best one of your need. See below detail:
Resolution of display: 9,999 counts for Voltage
and 3,999 counts for other measurements.
% of mA display can be selected for 4-20 mA or
0-20 mA.
The timer of auto power save can be adjusted
from 1 to 99 minutes even disable this function.
Dynamic Recording helps to record the variation
of tests.
Data Hold to freeze displayed digital value.
Refresh Hold to freeze the digital value for
difficult measuring place.
Relative function
Auto and Manual Ranging
Communication with RS-232C
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Chapter 1 Overview
_______________________________________________
Chapter 2
Names and
Functions of Parts
3
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Chapter 2 Names and Functions of Parts
4
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2.1 Push Buttons
The operation of push-button is shown as below.
When push the button, a display symbol will light,
and the beeper will sound. Turning the rotary switch
to another switch setting resets all push buttons to
their default state.
button
SHIFT
For voltage and current measurements, press this
button momentarily to cycle through DC and AC
tests.
For mA measurement, press this button for more
than 1 second to set % of 4-20mA display.
For Ohm test, press button momentarily to toggle
"Audible continuity mode" ON/OFF. Pushing this
button for more than 1 second will exit the
continuity function and returns to the autoranging ohm measurement.
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Chapter 2 Names and Functions of Parts
_______________________________________________
button (Data Hold or Refresh Hold)
HOLD
Press this button momentarily to toggle data hold
on or off. The display shows
HOLD
to indicate
the hold function.
The data hold function allows operator to hold the
displayed digital value, if you select " Refresh
Hold " by Power-ON Options, the reading is
updated to the display automatically when the
reading changes. The beeper sounds a tone to
remind user, that an update has occurred.
button (Dynamic Recording)
REC
Records maximum, minimum, and calculates true
average. Press this button for more than 1 second
to toggle recording mode on or off.
Press this button momentarily to cycle through
MAX, MIN, MAX-MIN, AVG and present (
REC
) readings.
The beeper sounds when a new maximum or
minimum value is recorded.
5
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Chapter 2 Names and Functions of Parts
6
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button
REL
Press this button momentarily to toggle the relative
mode ON or OFF.
RANGE
button
In auto-range press this button momentarily to
select manual range and turn off the "AUTO"
annunciator.
In manual range, press this button momentarily to
step up 1 range at one time, press this button for
more than 1 second to select auto-range.
In auto-range, the "AUTO" annunciator is lit and
the meter will select an appropriate range for
measurement being made. If a reading is greater
than maximum available range, "OL"(overload) is
displayed on the screen. The meter selects a lower
range when reading is less than about 9% of full
scale.
____________________________________________
Chapter 2 Names and Functions of Parts
_______________________________________________
2.2 Rotary Switch
To select function, turn the rotary switch to a switch
setting. Then the meter is ready for use. (If you
press and hold any push button while pushing the
meter from OFF to ON, the display will remain lit
until the push button is released.)
Power off position.
AC or DC voltage measurements. Initial test
is defined to AC.
Diode Check
Ohm and Continuity measurements
Capacitance measurement.
AC or DC Current measurements
AC or DC Current measurements.
A
AC or DC Current measurements.
7
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Chapter 2 Names and Functions of Parts
8
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2.3 Input Terminal
1
2
1. Volts, Ohms, Diode, Capacitance measurements.
2. Common terminal for all measurements.
3. Current (maximum 400 mA) measurements.
4. Current (maximum 10 A continuous)
measurements.
3
4
____________________________________________
Chapter 2 Names and Functions of Parts
_______________________________________________
A
µ
A
µ
2.4 LCD Display Illustration
9
APS
UTO
HOLD
RS232C
REL
Enable Auto power save
Indicates AUTO range Mode
Data hold annunciator
Enable RS-232C
Relative mode annunciator
Direct Current or Voltage
Alternating Current or Voltage
REC
MAX-MIN
MAX
AVG
Dynamic recording mode, Present reading
Different reading for MAX-MIN
Maximum reading
Minimum reading
MIN
Average reading
Diode measurement
Continuity function annunciator
Low battery indicator
% display for 4-20mA measurement
%
mV
m
mF
Units of Voltage measurement
Units of Current measurement
Units of Capacitance measurement
____________________________________________
Chapter 2 Names and Functions of Parts
10
_______________________________________________
Mk Ω
Units of Resistance (ohm) measurement
Bar-graph indicator
____________________________________________
Chapter 2 Names and Functions of Parts
_______________________________________________
11
Chapter 3
Measurement
Procedures
DANGER
Observe the following precautions to avoid
electric shock.
Always verify the appropriate setting of the
function selector before connecting the test
leads.
Disconnect the test leads from the
measurement object before switching the
function selector.
NOTE
When measuring voltage which includes harmonic
waves
(ex. horizontal output of TV), there is the possibility
that a setting error may occur
____________________________________________
Chapter 3 Measurement Procedures
12
_______________________________________________
Preparation for Measurement
The safety caps are attached to the test leads.
Remove these caps before connecting to the unit.
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Chapter 3 Measurement Procedures
_______________________________________________
13
3.1 Voltage Measurement
DANGER
The maximum input voltage is 1000 VDC, 1000
Vrms or 10
6
V Hz. Attempting to measure
voltage in excess of the maximum input could
destroy the product and result in personal
injury or death.
To avoid electrical shock, be careful to avoid
shorting live lines with the test leads.
For safety, test lead connections must always
be made at the secondary side of a circuit
breaker.
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Chapter 3 Measurement Procedures
14
_______________________________________________
3.1.1 AC Voltage Measurement
(1) Set the rotary switch to "
(2) Connect the black test lead to "COM" terminal
and red test lead to "" terminal.
(3) Touch the test leads to the test points and read
the display.
/V ".
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Chapter 3 Measurement Procedures
_______________________________________________
15
3.1.2 DC Voltage Measurement
(1) Set the rotary switch to "
(2) Push
button momentarily to set DC test.
SHIFT
/V ".
(3) Connect the black test lead to "COM" terminal
and red test lead to "
" terminal.
(4) Touch the test leads to the test points and read
the display.
____________________________________________
Chapter 3 Measurement Procedures
16
_______________________________________________
3.2 Diode Check
DANGER
Never apply voltage to the test leads when the
Diode Check functions is selected. Doing so
may damage the product and result in personal
injury.
To avoid electrical accidents, remove power
from the circuit before measuring.
A good diode allows current to flow in one direction
only. To test a diode, turn the power off, remove the
diode from the circuit, and proceed as follows:
(1) Set the rotary switch to "
" position.
(2) Connect the black test lead to "COM" terminal
and red test lead to "
" terminal.
(3) Touch the test leads to diode and read the
display.
(4) Touch the red lead to the positive side of the
diode and the black lead to the negative side.
The meter can display diode voltage drops to
approximately 2.5 V.
A typical voltage drop is 0.3 to 0.8 V, and the
meter will sound a beep to remind user.
____________________________________________
Chapter 3 Measurement Procedures
_______________________________________________
17
Reverse the test leads and measure the voltage
across the diode again. If the diode is:
Good : "OL" is displayed.
Shorted : Near 0 V drop is displayed in both
directions, and the beeper sounds
continuously.
Open : "OL" is displayed in both directions.
Repeat step (3) and (4) for other diodes.
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Chapter 3 Measurement Procedures
18
_______________________________________________
3.3 Resistance Measurement
DANGER
Never apply voltage to the test leads when the
Resistance, Continuity Check functions are
selected. Doing so may damage the product
and result in personal injury.
To avoid electrical accidents, remove power
from the circuit before measuring.
(1) Set the rotary switch to "".
(2) Connect the black test lead to "COM" terminal
and red test lead to "
(3) Touch the test leads to resistor and read the
display.
(4) Press
button momentarily to toggle
SHIFT
CONTINUITY function ON/OFF. The continuity
range is 0 to 400.0 Ω.
(5) Momentarily pushing this button will only turn
the beeper off. While testing continuity, the
beeper will sound if the resistance falls below
100 counts.
" terminal.
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Chapter 3 Measurement Procedures
_______________________________________________
19
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Chapter 3 Measurement Procedures
20
_______________________________________________
3.4 Current Measurement
DANGER
Never apply voltage to the test leads when a
current measurement function is selected.
Doing so may damage the product and result in
personal injury.
To avoid electrical accidents, remove power
from the circuit before connecting the test
leads.
WARNING
To prevent electrical accidents, do not use the
tester to measure current when the electric
potential is 600 V or greater. The current
function overload protection trips at either 600
V DC, 600 V rms.
____________________________________________
Chapter 3 Measurement Procedures
_______________________________________________
21
3.4.1 AC Current Measurement
NOTE
(1) Set the rotary switch to "
/A ".
(2) Connect the black test lead to "COM" terminal
and red test lead to "A" terminal.
(3) Touch the test leads to the test points and read
the display.
If the reading is lower than 400 mA, to get better
resolution of display, please turn the rotary switch to
mA or µ
A position and remove the red test lead to
"µAmA" terminal.
Instrument operated by
alternatingcurrent
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Chapter 3 Measurement Procedures
22
_______________________________________________
3.4.2 DC Current Measurement
NOTE
(1) Set the rotary switch to "
(2) Push
button momentarily to set DC test.
SHIFT
/A ".
(3) Connect the black test lead to "COM" terminal
and red test lead to "A" terminal.
(4) Touch the test leads to the test points and read
the display.
If the reading is lower than 400 mA, to get better
resolution of display, please turn the rotary switch to
mA or µA position and remove the red test lead to
"µ
AmA" terminal.
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Chapter 3 Measurement Procedures
_______________________________________________
23
3.5 Capacitance Measurement
DANGER
Never apply voltage to the test leads when the
Capacitance functions are selected. Doing so
may damage the product and result in personal
injury.
To avoid electrical accidents, remove power
from the circuit before measuring.
(1) Set the rotary switch to "" position
(2) Connect the red lead to "
lead in "COM" terminal.
(3) Open test leads, then push
momentarily to zero the residual.
(4) Remove the capacitor from circuit board or
device.
(5) Connect the test lead across the capacitor and
read the display.
" terminal, and black
button
REL
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Chapter 3 Measurement Procedures
24
_______________________________________________
NOTE
Observe polarity when measuring the polarized
capacitors.
Discharge capacitor before measurement.
When testing low-capacitance devices, noise
introduced into the test leads from the human
body may prevent the measured value from
stabilizing. If this occurs, use the optional 9617
CLIP ON BASE or the optional 9618 CLIP-TYPE
LEAD and keep hands away from the leads
during measurement.
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Chapter 3 Measurement Procedures
_______________________________________________
25
Chapter 4
Special Functions
Instructions
This multi-meter provides the operator with various
functions including:
(1) Data Hold
(2) Refresh Hold
(3) Dynamic Recording
(4) Relative (Zero)
(5) % of mA Measurement (4-20 mA)
(6) Beeper On/Off
(7) Set Up
(8) Communication (RS-232C)
____________________________________________
Chapter 4 Special Functions Instructions
26
_______________________________________________
4.1 Data Hold
The data hold function allows operators to hold the
displayed digital value, while the analog bar graph
continues showing the present readings. Press
button to enter the data hold mode, and the "
will be displayed. Press the button again to exit. The
present reading is now shown.
HOLD
HOLD
"
NOTE
The range is held in the case of auto range.
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Chapter 4 Special Functions Instructions
_______________________________________________
27
4.2 Refresh Hold
The reading is updated the value automatically and
the beeper sounds when the measurement value
changes 30 counts at least.
The refresh hold mode is effective until the power
supply is turned off.
(1) To active the refresh hold mode, turn on the
power supply while pressing the
(2) Release the button after all the LCD segments
are lit. Press any button for the measurement
modes
(3) Press
button to select ON/OFF of the
HOLD
refresh hold. While the refresh hold mode is
effective ,
HOLD
is displayed.
HOLD
button.
NOTE
When the reading value is unstable, the 3804 may
not update the display.
In the voltage, current, and capacitance function,
the reading is not updated when the measurement
value is less than 50 counts.
In the resistance and diode function, the reading
is not updated when the reading is "OL" or the
test leads are open.
The hold mode and the refresh hold mode use the
same display, so please pay attention when
measuring to make sure you are in the correct
mode.
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Chapter 4 Special Functions Instructions
28
_______________________________________________
4.3 Dynamic Recording
The dynamic recording mode can be used to catch
intermittent and turn on or turn off surges, verify
performance, measure while you are away, or take
readings while you are operating the equipment
under test and can not watch the meter.
The average reading is useful for smoothing out
unstable or changing inputs, estimating the percent
of time a circuit is operational, or verifying circuit
performance.
The operational procedures are described below:
(1) Press
enter the dynamic recording. The present value
is stored to memories of maximum, minimum
and average, and the annunciator turns on.
(2) Press
toggle recording mode on or off.
(3) Press
maximum, minimum, maximum - minimum,
average and present readings. The MAX, MIN,
MAX-MIN, AVG or annunciator will turn on
respectively to indicate what value is being
displayed.
button for more than 1 second to
REC
button for more than 1 second to
REC
button momentarily to cycle through
REC
____________________________________________
Chapter 4 Special Functions Instructions
_______________________________________________
29
(4) The beeper sounds when a new maximum or
minimum value is recorded.
(5) If an overload is recorded the averaging function
is stopped. An average value becomes
"OL"(overload).
NOTE
In dynamic recording, the auto power save feature
is disabled, after disabled and the "
APS
" turns
off.
Select dynamic recording in auto range, it will
record the values of MAX, MIN or AVG for
different ranges.
The record speed of dynamic recording is about
100 ms (0.1 s).
The average value is the true average of all
measured values taken since the recording mode
was entered.
If the range is changed in the manual range mode
or the function is changed, the dynamic recording
function is canceled.
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Chapter 4 Special Functions Instructions
30
_______________________________________________
Press
more than 1 second
REC
button for
Current value
Maximum value
Minimum value
Max. - Min. value
Average value
____________________________________________
Chapter 4 Special Functions Instructions
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