Zutemer 77 User manual

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Process calibrator
Multimeter
ZUTEMER 77
User Manual
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www.zutemer.cz
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Table of Contents
Title Page
1 Introduction …………………………………………..…………………………………………… 1
Generalization…………………………………………..…………………………………………… 1
Opening the Meter Case…………………………………………..………………………………… 1
Safety Information…………………………………………..……………………………………… 1
Symbols…………………………………………..………………………………………………… 3
2 Understand Meter…………………………………………..……………………………………… 3
Power-on…………………………………………..………………………………………………… 3
Automatic Power-off…………………………………………..…………………………………… 3
Low Battery Display…………………………………………..…………………………………… 4
Rotary Switch…………………………………………..…………………………………………… 4
Push Buttons…………………………………………..…………………………………………… 4
Screen Display…………………………………………..………………………………………… 5
Input/Output Terminals…………………………………………..………………………………… 7
Using Display HOLD mode…………………………………………..…………………………… 7
3 Operation…………………………………………..…………………………………………… 7
Measuring AC Voltage. …………………………………………..………………………………… 7
Measuring DC Voltage…………………………………………..………………………………… 8

Measuring Resistance…………………………………………..…………………………………… 8
Continuity Test…………………………………………..………………………………………… 8
Diode Test…………………………………………..……………………………………………… 8
Measuring Current…………………………………………..……………………………………… 9
Measuring Loop-circuit Current…………………………………………..………………………… 9
Measuring Loop-circuit Current with 250Ω HART Resistance…………………………………… 10
Using Current Output Function…………………………………………..………………………… 10
Constant Current Output in SOURCE mode………………………………..……………………… 11
Constant Current Output in SIMULATE mode…………………………………………..………… 11
Manual- step Output…………………………………………..…………………………………… 12
Setup Function…………………………………………..………………………………………… 12
4 Maintenance…………………………………………..…………………………………………… 12
General Maintenance………………………………………..……………………………………… 12
Replacing the Batteries………………………………………..…………………………………… 12
Replacing Fuses………………………………………..…………………………………………… 13
5 Specifications……………………………………….…………………………………………… 15
Safety and Conformity……………………………..……………………………………………… 15
General Feature……………………………………..……………………………………………… 15
Detailed Accuracy indicator………………………..……………………………………………… 17

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SectionOne
Introduction
Warning
READ THE MANUAL BEFORE SERVICING THIS
METER
Generalization
The Meter is a battery-operated process maintain
ace field device which combined both digital-parameter
function with process-signal source together.
Functioning as follows:
l Measurement function of TC voltage, DC
voltage , Ohms, DC, Continuity and Diode; Data
reserving function;
l Output function of DC (Constant, Manual-Step
and SIMULATE modes)
l Loop-circuit testing function; Powering the loop
circuit with 24 Voltage and testing the current;
Built-in 250 HART loop resistance
l Safety: complied with IEC 61010-1 safety
requirements for measurement, control and
electronic instruments for lab use.
Opening theMeterCase
Check the product to see whether it is damaged in
the shipment or not. Check the materials to see whether
they are the same as shown in the packing list. Keep the
packing materials for late delivery.
Standard and chosen accessories supplied
are listed as follows. Chosen ones are bought at
purchaser’s options.
Standard accessories
• 1 testing wire(with alligator clips)
• 1 user’s manual
• 2 1.5V (LR6)Alkaline batteries
• 2 63mA/250V Fast Fuses
Safetyinformation
The design, manufacture and test of the Meter reach
the IEC 61010-1 Safety Requirements. This Manual
contains all warnings and safety regulations that must be
followed to ensure safe operation and retain the meter in
safe condition. Read the following instructions before
operation.
Mark in the Meter means the operator needs to
make reference to related parts in the Manual to ensure
safe operation.
Warning indentifies conditions and actions that pose
hazard(s) to the user;
Caution indentifies conditions and actions that may
damage your meter.
Note indentifies symbols from which you can
understand operation and features of your meter. For

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related international symbols used by the Meter and the
Manual, please read Table 1-1 for reference.
Warning
l Do not use the meter if it is damaged. Before using
the meter, inspect the case. Look for cracks or
missing plastic. Pay particular attention to the
insulation surrounding the connectors.
l Make sure the battery door is closed and latched
before operating the meter.
l Remove test leads from the meter before opening the
battery door.
l Inspect the test leads for damaged insulation or
exposed metal. Check test leads before using the
meter. Replace the damaged leads before use.
l Do not use the meter if it operates abnormally.
Protection may be impaired. When in doubt, have the
meter serviced.
l Do not operate the meter around explosive gas, vapor,
or dust.
l Use only type AA batteries, properly installed in the
meter case to power the meter.
l Use caution when working above 30V ac rms, 42V ac
pk, or60V dc. Such voltages pose a shock hazard.
l When using the probes, keep fingers behind the
finger guards on the probes.
l Connecting the common test lead before connecting
the live test lead. When disconnecting test leads,
disconnect the live test lead first.
l Read carefully and make sure well understanding of
this Manual before use.
l Make sure the requirements in the Manual are strictly
followed and keep the Manual for reference whenever
needs.
l Mis-operation may cause accidents and damages to
the Meter in testing. Caution
To avoid possible damage to the Meter or to equipment
under test:
l Make sure the rotary switch is in the right position,
disconnect the testing leads and the circuit under test
before rotating, conversion in testing is prohibited in
case of damaging the Meter.
l Cut all the power off and release electricity fully from
all capacitor before testing online resistance, biode
and continuity.
l Check fuse in the Meter before testing current (See
Section Five Replacing Fuse). Cut off the power
before connection. Remember: when testing current,
connect the Meter with the Circuit in series. Do not
connect testing leads to any circuit in parallel.
l Do not use the Meter if symbol displays.
l Do not store or use the Meter in high temperature,
high moisture, explosive, inflammable, strong
electromagnetic environment and dew or direct
sunlight place.
l Do not use abrasive or solvent to clean the Meter, use
a damp cloth or neutral detergent instead.

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l Make dry before store if the Meter is damp.
Symbols
For related international symbols used in the Meter
and the Manual, please read Table 1-1 for reference.
Table 1-1 International Symbols
Symbol MeaningSymbolMeaning
Alternating
current Earthground
Direct current Fuse
alternating or
Directcurrent Double insulated
Riskofdanger.
Important
information. See
Manual
Battery
Conforms to European Union directives
CATIII
Overvoltage of class three, secondary pollution
(according to IEC61010) refers to the level of
protection for the pulse compression. Typical
installation location includes: distribution of
three-phase circuit (including a single commercial
lighting circuit) position-fixed equipment; interior
lighting equipments in large buildings, lines;
industrial field devices.
CAT
Overvoltage of class four, secondary pollution
(according to IEC61010) refers to the level of
protection for the pulse compression. typical
installation location includes: Three-phase utility
power supply equipment for any outdoor power lines
or equipment; Any outdoor transmission lines;
Electricity meter front-end over-current protection
device.
SectionTwo
Understand Meter
Study this section to understand all features and
functions.
Power-on
Turn the rotary switch to the position to start a
function.
When powered-on, the Meter starts inner
self-diagnose and displays in full screen before
undergoing related operations.
Note
Power-on: wait for 5 seconds before restart to make
sure correct current operation.
AutomaticPower-off
Factory-setting defines that the Meter will
automatically power off if no operation undergoes within
15 minutes.
If automatically power off, turn rotary switch to OFF

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position and then restart.
User can choose automatic power-off function (See
Section 3 “Setup function”)
Note: we suggest turning rotary switch to OFF
position if no work is undergoing because there is about
300uA loss even if the Meter is automatically
powered-off.
Low-batterydisplay
Replace batteries as soon as possible if symbol
displays on the screen.
Warning
To avoid possible electrical shock and body injury
caused by wrong readings, replace batteries as soon as
possible if symbol displays on the screen.
RotarySwitch
Turn the rotary switch to any position to open the
Meter. Standard display of the function will appear in the
screen.
Press green button to select green function of the
rotary switch.
When the rotary switch turned to another function,
the screen will display information of the new function.
Sets on a certain function will not extend to another one.
Rotary Switch is shown in Figure 2-1.Illustration for
rotary position is shown in Table 2-1.
Figure 2-1 Rotary Switch
PushButtons
Push buttons are shown in Figure 2-2.Illustration for
press buttons are shown in Table 2-1.
Figure 2-2 Push Buttons

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Table 2-1 Rotary Switch
Positi
on Rotaryswitchfunction
GreenButton
Function
ACV measurement none
DCV measurement none
Resistance
measurement none
Continuity test Diode test
DcmA measurement none
current output 25%,100% step
output
simulate transmitter
Loop-circuit current
measurement (loop
power)
none
Loop-circuit current
measurement with 250Ω
HART Resistance (loop
power)
none
Table 2-2. Press Button
Press
butto
n illustration
Under measurement function: readings
display and held function
Under output function: select output set
towards left.
Under output function: select output settings
towards left.
set output :increase set value;
Step output: output makes step and linear
increase by 25% or 100% for each press.
Set output: decrease set value.
Step output: output makes step and linear
decrease by 25% or 100% for each press.
in position, select diode measurement;
in and position, select 25% or 100%
step output.
shift between unit mA and mA .
ScreenDisplay
Display screen is shown in Figure 2-3.Illustration for
display screen is shown in Table 2-3.

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Figure 2-3 Display screen
Table 2-3. Display screen
NO. DisplayIllustration
1 INPUT
Lights when measurement is
active
2 Lights when output is active
3
Lights when measured value
is held in measuring mode
4 Data display
5 SIMULATE
Lights when the Meter works
in simulate transmitter
mode.
6 250Ω HART Lights when 250Ω HART
resistance function is active
7
0 FS
Lights when calibration is
active.
8 Showslowbatterystate
9 LOOP POWER Starts 24v loop circuit power
supply
10 ACDC Direct current, Alternating
current
11
％
mVA
k
Measurement or output unit
12
25％
100％
Shows 25% or 100%
manual-step output of Dc
mA in output mode
13 ▲▲▲▲▲ output set
14
continuity test function in
measurement mode
15
Lights in diode test function
16
More than 30v input voltage
in measurement mode

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Input/outputterminals
Input/output terminals are shown in Figure
2-4.Illustration is shown in Table 2-4.
Figure 2-4 input/output terminals
Table2-4. Input/output terminals
NO. terminals illustration
1 +LOOP output point for loop circuit power
2 mA
current measurement input
common point for DC output
common point for loop circuit power
Simulates the output of a transmitter
group (with external power supply
connected in series.)
With protection by 63mA fuse.
3 COM
common point for all testing
Common point for simulate
transmitter output.
4 VΩ
voltage output of 600V、Ω、diode and
continuity test.
Using display holdmode Display HOLD ）
Under output mode, the Meter freezes data
displayed in the reading part when pressing button to
enter into display hold mode (screen displays symbol).
Repress button to exit from display hold mode.
SectionThree
Operation
This section introduces how to use this Meter.
Most functions are available by turning rotary switch.
White symbols besides rotary switch indicates main
function, green symbols indicates replacing function.
Press green button to use the replacing function.
Measuring AC voltage
1. turn the rotary switch to “ ”;
2. insert black probe into “COM” terminal ,and insert red
probe into “ V” terminal;
3. Connect the probes to the circuit under test and then
read the measured value when stable.

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Measuring DC voltage
1. Turn the rotary switch to “ ”;
2. Insert black probe into “COM” terminal ,and insert red
probe into “ V” terminal;
3. Connect the probes to the circuit under test and then
read the measured value when stable.
Warning
l Do not input voltage higher than DC 600V or AC
600V rms. There is a risk of damaging the Meter
though it is possible to display a higher voltage.
l When the input voltage is higher than 30v, symbol
displays for warning.
Measuring resistance
Warning
l To avoid damage to the Meter or equipment under
test, cut all power off and release electricity fully from
all capacitor before testing continuity.
1. turn the rotary switch to “Ω”;
2. insert black probe into “COM” terminal ,and insert red
probe into “ V” terminal;
3. Connect the probes to the circuit under test and then
read the measured value when stable.
Note
l The screen displays if the open circuit or
resistance of the device under measurement
exceeds the maximum range of the Meter.
l Because the testing current output by the meter may
go through all possible links between probes, the
measured resistance value in the circuit could be
different from the rated value
Continuitytest
Warning
l To avoid damage to the Meter or equipment under
test, cut all power off and release electricity fully from
all capacitor before testing continuity.
1. turn the rotary switch to“”;
2. insert black probe into “COM” terminal ,and insert red
probe into “ V” terminal;
3. Connect the probes to the circuit under test and the
buzzer beeps when the circuit connected (resistance
lower than 20Ω)
DiodeTest
Warning
l To avoid damage to the Meter or equipment under
test, cut all power off and release electricity fully from
all capacitor before testing continuity.
1. turn the rotary switch to“”, press green button and
select test;
2. insert black probe into “COM” terminal ,and insert red
probe into “ V” terminal;
3. Connect the probes to the diode under test and then
read the measured value when stable.
Forward test: connect the red probe to the positive polar
of the diode under test and black probe to the negative
polar, the screen displays approximate value of diode

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forward voltage drop, about 0.5～0.8V generally.
Adverse test: connect the red probe to the positive polar
of the diode under test and black probe to the negative
polar, the screen displays in normal case.
Measuring Current
Warning
To avoid damage to the Meter or equipment under
test, make sure both the rotary switch position and input
terminal position conforms to the required measurement
mode.
1. turn the rotary switch to“ ”
2. insert black probe into “COM” terminal ,and insert red
probe into “mA” terminal;
3. Connecttheprobestothecircuit undertestand
thenreadthemeasuredvaluewhenstable.
4. Press button to display current value in
percentage form.
Table 3-1 current value in percentage form.
current value Displayed In
percentage form
-22.000mA -162.50%
0.000mA -25.00%
4.000mA 0.00%
20.000mA 100.00%
22.000mA 112.50%
Measuring loop-circuitcurrent
The function may measure current value powered
with 24VDC constant voltage.
24V loop-circuit measurement function may test
transmitter loop circuit.
The meter may be connected to transmitter, but not
to transmitter or signal adaptor.
Warning
Typical value of loop power supply is 24DVC. Voltage
between terminals could be higher than 24V in different
situations, such as current value in loop circuit or internal
connection in series.

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Figure 3-1 Measuring Loop Circuit Current
1. turn the rotary switch to“””, and the screen displays
“ LOOP POWER”;
2. insert black probe into “mA”” terminal ,and insert red
probe into “+LOOP” terminal;
3. Connect the probes to the circuit under test and then
read the measured value when stable.
4. Press button to display current value in
percentage form.
Measuring loop-circuitcurrentwith250 HART
resistance
1. turn the rotary switch to“ ”, and the screen displays
“ LOOP POWER” and “250Ω HART”;
2. insert black probe into “mA”” terminal ,and insert red
probe into “+LOOP” terminal;
3. Connect the probes to the circuit under test and then
read the measured value when stable.
4. Press button to display current value in
percentage form.
Using currentoutputfunction
The meter offers 0-20 mA and 4-20mA current output
functions.
Two output modes:
SOURCE mode: supply current from internal source;
SIMULATE mode (simulate): absorb current from
external source
Two Configuration modes:
Constant current output: constant output of designated
current.
Manual-step output: output current increases or
decreases in 25% or 100% step.
If you need to apply current for non-source circuit
(such as loop current without power), then select
SOURCE mode. The meter consumes more battery
power of being used as current source than that of being
used in SIMULATE mode, so select SIMULATE mode if
possible.

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Warning
Do not apply output terminals with voltage higher
than 30v; otherwise it may lead to electric shocks.
Make sure that the voltage between circuit and
ground wire is lower than 30v. Be sure to use the
enclosed probes and wires (check them to see whether
they in a suitable measurement mode).
Warning
Do not apply any voltage to output terminals except
in SIMULATE mode. Any wrong application may damage
internal circuit.
Constantcurrentoutput(SOURCEmode)
1. Turn the rotary switch to“ ”;the screen displays
“OUTPUT” and “LOOP POWER”; output is set as
0mA.
2. insert black probe into “mA”” terminal ,and insert red
probe into “+LOOP” terminal;
3. Press button to display current value in
percentage form.
4. press 、、、buttons to set output value.
5. Connect the leading wire to the circuit under test.
Constantcurrentoutput(SIMULATEmode)
SIMULATE mode refers to simulate a group of
loop-circuit current transmitter with the Meter.
If there are cases of an external DC voltage (range
from 5-28 v) and tested loop current in series, then select
SIMULATE mode.
Warning
Before connecting the testing lead to loop circuit
current, turn the rotary switch to any position of mA output.
Otherwise, low impedance from other position of rotary
switch will appear and cause current higher than 35mA to
go through the loop circuit.
Set the polar of applied voltage as shown in
Figure3-2, do not connect reversely.
Figure 3-2 current output in SIMULATE mode
1. Turn the rotary switch to“ ”; the screen displays

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“OUTPUT” and “SIMULATE”; output is set as 0mA.
2. insert black probe into “mA”” terminal ,and insert red
probe into “mA” terminal;
Press button to display current value in
percentage form.
3. press 、、、 buttons to set output value.
4. Connect the leading wire to the circuit under test.
Manual-stepoutput
In constant current output mode, press green button
to select manual-step output function: increases or
decreases in 25% or 100% step.
Press 、button may increase or decrease
current in 25 or100 step. See Table3-1
Setup function
Setup function may:
1. Start and close automatic power-off function;
2. Open and close buzzer.
In power-off state, press button and turn the rotary
switch from OFF to any other position simultaneously.
Wait for 2 seconds and then loosen.
Press button to select setup function; press
button to change setup state; press green button to hold
setup value.
SectionFour
Maintenance
This section provides some basic maintenance
procedures. Repair, calibration, and servicing not
covered in this manual must be performed by qualified
personnel. For maintenance procedures not described in
this manual, contact a ZUTEMER’s Service Center.
GeneralMaintenance
Periodically wipe the case with a damp cloth and
detergent; do not use abrasives or solvents.
l Take out the batteries if the meter won’t be used for
a long time.
l Dirt or moisture in the terminals can affect readings.
Clean the terminals as follows:
（1）、 Turn the Meter off and remove all test leads.
（2）、 Shake out any dirt that may be in terminals.
（3）、 Soak a new swab with alcohol. Clean each
terminal with the swab.
Replacing thebatteries
The Meter is powered by two AA batteries (IEC LR6).
Warning
To avoid electrical shock or personal injury:
l Remove test leads from the meter before opening
the battery door.
l Close and latch the battery door before using the
meter.
Note
l The new and old Batteries can not be mixed.
l Make sure the battery’s odes are in accordance with
the symbols illustrated in battery pool when

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replacing them.
l Take out the batteries if the meter won’t be used for
a long time.
l Dispose the old batteries in accordance with the
local law.
Replace the batteries as follows.( Refer to Figure 4-1).
Figure 4-1 replacing the batteries
1. turn the rotary switch to OFF and remove the test
leads from the terminals;
2. take off the protector of the meter , remove the
battery door by using a standard-blade screwdriver to
turn the battery door fasteners, and then take of the
battery case;
3. replace with two new batteries;
4. Reinstall the battery case and tighten screws.
Replacing fuses
Warning
To avoid personnel injury or damage to the meter,
use only the specified fuse. The specification is 63mA
250V fast-melt.
3mA 250V-fuse protection is in the mA current output
terminal. To check whether fuses are blown:
1. Turn the rotary switch to
2. Plug the black test into COM, and the red test lead
into the mA input.
Use an ohmmeter to check the resistance between
test leads .If the resistance is about 20Ω, the fuse is good.
An open reading means that fuse is blown.
Replace the fuse as follows. (Refer to Figure 4-2 if
necessary).
1. Remove the test leads from the meter and turn the
meter OFF.
2. Take off the protector of the meter, remove the four
screws by using a standard-blade screwdriver, and
then take off the cover.
3. Replace the blown fuse(s).
4. Reinstall the cover.
5. Reinstall the protector.

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Figure 4-2 replacing a fuse

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SectionFive
Specification
Safetyandconformity
overload protection V~COM terminal：AC600V/10 seconds。
mA terminal：63mA/250V fast-melt fuse
legal conformity IEC61010-1（CAT Ⅳ 600V、CAT Ⅲ 1000V、Pollution Classification
Ⅱ）
electromagnetic compatibility Conforms to IEC61326-1，Group 1、Class B
Surge protection 8kV（according to IEC61010.1-2001）
Identification Mark CE
Quality Standard Develops , designs and manufactures in confirmty with ISO 9001
Generalfeature
Display Screen digit: display in four digits(5 in current measurement and output)
refresh display 2.5 displays/second
operation temperature and moisture
range 0～40 ºC, relative moisture≤85%(no condensation)
storage temperature and moisture range -20 ºC～60 ºC、relative moisture≤90%( no condensation)
accuracy required temperature and
moisture range 23±5ºC、relative moisture≤75%( no condensation)
temperature co-efficiency 0.1 × basic accuracy / ℃（temperature range <18℃ or >28℃）

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ambient condition for operation Indoor, outdoor operation（no waterproof）， at an altitude of 0～2,000
meter
indicator for over-range OL
continuity/open test Beeper sounds for resistance readings below threshold, or to indicate
a momentary open circuit
battery type two AA 1.5V Alkaline (LR6) batteries
battery life
when using alkaline battery:
measures any parameter: about 100 hours;
DC current output(SIMULATE)：about 50 hours;
DC current output (SOURCE)20mA(1000Ω load)：about 2.5 hours.
low battery displays battery symbol
automatic power-off The default value is 5 mins if no operation which is adjustable.
preheating time 10min
closed – case calibration No internal adjustments needed
battery access door Battery or fuse replaceable without voiding calibration
Measurement 180（L）×90（W）×47（D）mm
weight about 500g
calibration period one year

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Detailedaccuracyindicator
Accuracy is specified for a period of one year after calibration, at 23±5ºC, with relative humidity to 75 %.
Accuracy specifications are given as:± ( [ % of reading ] + [ number of least significant digits ] ) (note: “number of
least significant digits” means the digits increased or decreased in least significant digits)
Measuring detailedaccuracyindicator
Measuring
part rangefrequency
accuracyremark
DC voltage 50V 10mV 0.5%+4
• Measuring impedance 10 MΩ (standard
value)
• Common mode restrain: 50Hz or 60Hz >
100Db
• String mode restrain:50Hz or 60Hz >
45dB
• Overload protection: 600V (peak –peak
value)
AC voltage 500V 100mV
0.5%+20 ( 45Hz~100Hz )
• frequency beeps: 45Hz～400Hz
• Adaptive to range from 10% to 100%
• AC conversion: mean value
• Measuring impedence:10 MΩ(standard
value)<100pF
• Common mode restrain: 50Hz or 60Hz >
100Db
• Overload protection: 600V(peak –peak
value)
2%+20 ( 100Hz~400Hz )