Autoranging True RMS Multimeter TM-87 / TM

Autoranging True RMS Multimeter TM-87 / TM
Autoranging True RMS Multimeter
TM-87 / TM-88
User’s manual
HB2TM8700000
TM-87/TM-88
Contents:
1. SAFETY PRECAUTIONS AND PROCEDURES ..........................................................2
1.1. Preliminary ............................................................................................................2
1.2. During use .............................................................................................................3
1.3. After use ................................................................................................................3
1.4. Measuring (overvoltage) categories definitions .....................................................3
2. GENERAL DESCRIPTION ...........................................................................................4
2.1. Mean value and TRMS: definition..........................................................................4
2.2. True root mean square value and crest factor: definition.......................................4
3. PREPARATION FOR USE ...........................................................................................5
3.1. Initial ......................................................................................................................5
3.2. Supply voltage .......................................................................................................5
3.3. Calibration .............................................................................................................5
3.4. Storage..................................................................................................................5
4. OPERATING INSTRUCTIONS.....................................................................................6
4.1. Instrument - description .........................................................................................6
4.1.1. Front panel ................................................................................................................... 6
4.2. Description of function keys...................................................................................7
4.2.1. HOLD key..................................................................................................................... 7
4.2.2. PK/REL key.................................................................................................................. 7
4.2.3. MX/MN key................................................................................................................... 7
4.2.4. R/SEL key .................................................................................................................... 7
4.2.5. Backlight key (
) ...................................................................................................... 8
4.2.6. Disable Auto Power OFF ............................................................................................. 8
4.3. Measurements.......................................................................................................9
4.3.1. DC Voltage measurement............................................................................................ 9
4.3.2. AC Voltage measurement .......................................................................................... 10
4.3.3. DC Current measurement .......................................................................................... 11
4.3.4. AC Current measurement .......................................................................................... 12
4.3.5. Resistance measurement and Continuity Test .......................................................... 13
4.3.6. Diode test ................................................................................................................... 14
4.3.7. Capacitance measurement ........................................................................................ 15
4.3.8. Frequency measurement ........................................................................................... 16
4.3.9. Temperature test (Only for TM-88) ............................................................................ 17
5. MAINTENANCE .........................................................................................................18
5.1. General information .............................................................................................18
5.2. Battery replacement ............................................................................................18
5.3. Fuse replacement................................................................................................19
5.4. Cleaning ..............................................................................................................19
5.5. End of life ............................................................................................................19
6. TECHNICAL SPECIFICATIONS ................................................................................20
6.1. Technical features ...............................................................................................20
6.1.1. Electrical specifications .............................................................................................. 22
6.1.2. Safety ......................................................................................................................... 22
6.1.3. General data .............................................................................................................. 23
6.2. Environment ........................................................................................................23
6.2.1. Environmental conditions ........................................................................................... 23
6.2.2. EMC and LVD ............................................................................................................ 23
6.3. Accessories .........................................................................................................23
6.3.1. Standard accessories................................................................................................. 23
7. SERVICE....................................................................................................................24
7.1. Warranty conditions.............................................................................................24
7.2. After-sale service.................................................................................................24
1
TM-87/TM-88
1. SAFETY PRECAUTIONS AND PROCEDURES
This meter is in compliance with safety Standards EN 61010-1 related to electronic
measuring instruments. For your own safety and to avoid damaging the instrument follow
the procedures described in this instruction manual and read carefully all notes preceded
by this symbol .When taking measurements:
• Avoid doing that in humid or wet places - make sure that humidity is within the limits
indicated in paragraph 6.2.1.
• Avoid doing that in rooms where explosive gas, combustible gas, steam or excessive
dust is present.
• Keep you insulated from the object under test.
• Do not touch exposed metal parts such as test lead ends, sockets, fixing objects,
circuits etc.
• Avoid doing that if you notice anomalous conditions such as breakages, deformations,
fractures, leakages of battery liquid, blind display etc.
• Be particularly careful when measuring voltages exceeding 20V to avoid risk of
electrical shocks.
The following symbols are used:
CAUTION - refer to the instruction manual - an improper use may damage the
instrument or its components
Danger high voltage: risk of electric shocks
Double insulated meter
AC voltage or current
DC voltage or current
1.1. PRELIMINARY
• This instrument has been designed for use in environments of pollution degree 2.
• It can be used for VOLTAGE and CURRENT measurements on installations of overvoltage
CAT III 1000V and CAT IV 600V.
• This instrument is not suitable for measurements of non sine wave voltage and current.
• When using the instrument always respect the usual safety regulations aimed at
protecting you against the dangerous electric currents and protecting the instrument
against incorrect operations.
• Only the leads supplied with the instrument guarantee compliance with the safety
standards in force. They must be in good conditions and, if necessary, replaced with
identical ones.
• Do not test or connect to any circuit exceeding the specified overload protection.
• Do not effect measurements under environmental conditions exceeding the limits
indicated in paragraphs 6.1.1 and 6.2.1.
• Make sure that batteries are properly installed.
• Before connecting the test probes to the installation make sure that the rotary selector
is positioned on the right function.
• Make sure that LCD and rotary selector indicate the same function.
2
TM-87/TM-88
1.2.
DURING USE
CAUTION
An improper use may damage the instrument and/or its components or
injure the operator.
•
•
•
•
When changing the range, first disconnect the test leads from the circuit under test in
order to avoid any accident.
When the instrument is connected to measuring circuits never touch any unused
terminal.
When measuring resistors do not add any voltage. Although there is a protection
circuit, excessive voltage could cause malfunctioning.
If during measurement the displayed values remain constant check whether the HOLD
function is active.
1.3. AFTER USE
• After using the instrument turn it off.
• If you expect not to use the instrument for a long period remove the battery to avoid
leakages of battery liquids which may damage its inner components.
1.4. MEASURING (OVERVOLTAGE) CATEGORIES DEFINITIONS
EN 61010-1: Safety requirements for electrical equipment for measurement, control and
laboratory use, Part 1: General requirements, gives a definition of measuring category,
usually called overvoltage category. Paragraph 6.7.4: Measuring circuits:
(OMISSIS)
circuits are divided into the following measurement categories:
•
Measurement category IV is for measurements performed at the source of the
low-voltage installation.
Examples are electricity meters and measurements on primary overcurrent
protection devices and ripple control units.
•
Measurement category III is for measurements performed in the building
installation.
Examples are measurements on distribution boards, circuit breakers, wiring,
including cables, bus-bars, junction boxes, switches, socket-outlets in the fixed
installation, and equipment for industrial use and some other equipment, for
example, stationary motors with permanent connection to fixed installation.
•
Measurement category II is for measurements performed on circuits directly
connected to the low voltage installation..
Examples are measurements on household appliances, portable tools and similar
equipment..
•
Measurement category I is for measurements performed on circuits not directly
connected to MAINS.
Examples are measurements on circuits not derived from MAINS, and specially
protected (internal) MAINS-derived circuits. In the latter case, transient stresses are
variable; for that reason, the norm requires that the transient withstand capability of
the equipment is made known to the user.
3
TM-87/TM-88
2. GENERAL DESCRIPTION
This meter performs the below listed measurements:
•
•
•
•
•
•
DC and AC TRMS Voltage
DC and AC TRMS Current
Resistance and Continuity test
Frequency
Capacitance
Diode test
All selectable by means of a 10 position rotary selector (including OFF position). Functions
keys are also available (see chapter 4.2). An analogical bargraph is also available. The
selected quantity is displayed with indication of measuring unit and active functions.
The instrument disposes of an Auto Power Off function consisting in an automatic
switching off 30 minutes after last selector rotation or function selection.
2.1. MEAN VALUE AND TRMS: DEFINITION
Safety testers for AC quantities are divided in two big families:
• MEAN VALUE instruments, measuring only the value of the wave at the
fundamental frequency (50 or 60 Hz)
• TRUE ROOT MEAN SQUARE (or “TRMS”) instruments, measuring the true root
mean square value of the quantity under test.
In presence of a perfectly sinusoidal wave, both families provide identical results. While in
presence of distorted waves, readings are different. Mean value instruments provide only
the value of the fundamental wave while TRMS instruments provide the value of the entire
wave, including harmonics (within the passband of the instrument). Accordingly, if the
same quantity is measured with both kinds of instruments, the measured values are
identical only if the wave is purely sinusoidal. Should it be distorted, TRMS instruments
provide higher values than MEAN VALUE instruments.
2.2. TRUE ROOT MEAN SQUARE VALUE AND CREST FACTOR: DEFINITION
The effective current value is defined as follows: “In an interval of time equivalent to a
period, an alternate current with effective value having an intensity of 1A, by passing on a
resistor, disperses the same energy which would be dispersed in the same period of time
by a direct current having an intensity of 1A”. From this definition comes the numerical
expression: G=
1
T
t 0 +T
∫g
2
(t )dt The effective value is indicated as RMS (root mean square).
t0
The Crest Factor is defined as the ratio between the Peak Value of a signal and its
Gp
effective value: CF (G)=
. This value varies according to the waveform of the signal,
G RMS
for a purely sinusoidal wave it’s worth 2 =1.41. In presence of distortions the Crest Factor
assumes higher values as long as the wave distortion is higher.
4
TM-87/TM-88
3. PREPARATION FOR USE
3.1. INITIAL
This instrument was checked both mechanically and electrically prior to shipment. All
possible cares and precautions were taken to let you receive the instrument in perfect
conditions. Notwithstanding we suggest you to check it rapidly (eventual damages may
have occurred during transport – if so please contact the local distributor from whom you
bought the item).
Make sure that all standard accessories mentioned in paragraph 6.3.1 are included.
Should you have to return back the instrument for any reason please follow the
instructions mentioned in paragraph 7.
3.2. SUPPLY VOLTAGE
The instrument is supplied by 1x9V battery type NEDA1604 JIS006P IEC6F22. When
battery is low, a low battery indication “ ” is displayed. To replace/insert battery please
refer to paragraph 5.2.
3.3. CALIBRATION
The instrument complies with the technical specifications contained in this manual and such
compliance is guaranteed for 1 year. Annual recalibration is recommended.
3.4. STORAGE
After a period of storage under extreme environmental conditions exceeding the limits
mentioned in paragraph 6.2.1 let the instrument resume normal measuring conditions
before using it.
5
TM-87/TM-88
4. OPERATING INSTRUCTIONS
4.1. INSTRUMENT - DESCRIPTION
4.1.1. Front panel
LEGEND:
1. LCD
2. HOLD Key
3. PK/ REL Key
4. MX/ MN Key
5. R/SEL Key
6.
7.
8.
9.
10.
11.
12.
13.
14.
Backlight
Key
OFF position
DCV position
ACV position
Posizione Ω/
position
position
Hz position
µADC position
℃ and ℉ position(TM-88)
15. µAAC position
DCµA and ACµA position(TM-88)
16. DCA and ACA position
Hz
µA
17. COM,A,and VΩ
℃℉
Fig. 1: Instrument description
6
TM-87/TM-88
4.2. DESCRIPTION OF FUNCTION KEYS
When pressing a key, the corresponding symbol is displayed with a beep. To resume
default state turn the selector on another function.
4.2.1. HOLD key
By pressing HOLD key the measured value is frozen on the display where the symbol
"HOLD" appears. Press again HOLD to disable this function and resume normal operation.
4.2.2. PK/REL key
This key have the double function of measuring max/min peak values (active for ∼V and
∼µA positions of rotary selector) and performing relative measurements (REL) for V, A,
, ,
and µA positions of rotary selector.
Hz, Ω/
This key have the double function of measuring max/min peak values (active for ∼V and
∼µA positions of rotary selector) and performing relative measurements (REL) for V, Hz,
, ,
and ℃/℉ positions of rotary selector.(TM-88)
Ω/
Press cyclically PK/REL to measure and save peak values. “PMAX” and “PMIN” symbols on
the display correspond to Maximum Peak and Minimum Peak values respectively which
are continuously updated by the meter. By keeping pressed PK/REL key for at least 3
seconds, “CAL” symbol appears on the display and the meter performs an auto calibration
permitting a higher accuracy on peak measurements.
To exit this function keep pressed PK/REL for at least one second or rotate the selector on
another position.
By pressing PK/REL key, the relative measurement is activated: the meter saves the
(offset) value on the display and the “REL” symbol is shown. The following measurement
will be referred to this offset value. By pressing again PK/REL key the offset value is
shown and the “REL” symbol is blinking.
To exit this function keep pressed PK/REL for at least one second or rotate the selector on
another position.
4.2.3. MX/MN key
By pressing MX/MN key, maximum and minimum values are measured. Both values are
stored and automatically updated as soon as an higher value (MAX) or lower value (MIN)
are measured by meter. The symbol corresponding to the desired function is displayed:
“MAX” for maximum value, “MIN” for minimum value. MX/MN key is disabled when HOLD
function is active.
To exit this function keep MX/MN key pressed for at least 1 second or rotate the selector
to another position.
4.2.4. R/SEL key
By pressing R/SEL key the manual selection of measured range (exception
, ∼A and
A positions) and the selection of a double function which are included on selector (by
measure and AC or DC Current) are possible. The “MANU”
choosing between Ω
symbol is shown at display by pressing R/SEL key and the cyclically pressure of the key
change the measuring range and fix the decimal point on the display. Press R/SEL key at
least 1second or rotate the selector to exit from this function and restore the “AUTO”
symbol at display.
7
TM-87/TM-88
4.2.5. Backlight key (
)
By pressing
key it’s possible to activate the backlight function on the display. The
function automatically disabled itself after some seconds and is available on each position
of the rotary selector.
4.2.6. Disable Auto Power OFF
When the meter is to be used for long periods of time, the operator might want to disable
the AutoPowerOFF function. Once the AutoPowerOFF function is disabled the meter stays
on continuously. To disable the AutoPowerOFF function:
• Switch OFF the meter.
• Turn ON the meter keeping pressed PK/REL, MX/MIN and R/SEL keys.
The AutoPowerOFF function is automatically activated when turning ON again the meter.
8
TM-87/TM-88
4.3. MEASUREMENTS
4.3.1. DC Voltage measurement
CAUTION
The maximum input for DC voltage is 1000V. Do not attempt to measure
higher voltages to avoid electrical shocks or damages to the instrument.
Fig. 2: Using the meter for DC Voltage measurement
1. Selecting the position V .
2. Pressing the R/SEL key to select the correct range or using the Autorange feature (see
paragraph 4.2.4). If the voltage value under test is unknown, select the highest range.
3. Insert the test leads into the jacks, the red plug into HzVΩµA jack and black plug
into COM jack (see Fig. 2).
4. Connect the red and black test leads to the positive and negative poles of the circuit
under test respectively. The voltage value is displayed.
5. If the message "O.L" is displayed select a higher range.
6. The symbol "-" on the instrument display indicates that voltage has opposite direction
with regard to the connection.
7. For HOLD function, Minimum and Maximum value measurement and Relative measure
please refer to paragraph 4.2.
9
TM-87/TM-88
4.3.2.
AC Voltage measurement
CAUTION
The maximum input for AC voltage is 750Vrms. Do not attempt to measure
higher voltages to avoid electrical shocks or damages to the instrument.
Fig. 3: Using the instrument for AC Voltage measurement
1. Selecting the position V .
2. Pressing the R/SEL key to select the correct range or using the Autorange feature (see
paragraph 4.2.4). If the voltage value under test is unknown, select the highest range.
3. Insert the test leads into the jacks, the red plug into HzVΩµA jack and black plug
into COM jack (see Fig. 3).
4. Connect the test leads to the circuit under test. The voltage value is displayed.
5. If the message "O.L" is displayed select a higher range.
6. For HOLD function, Minimum and Maximum value measurement and Peak
measurement please refer to paragraph 4.2.
10
TM-87/TM-88
4.3.3.
DC Current measurement
CAUTION
The maximum input for DC current is 10A. Do not attempt to measure
higher currents to avoid electrical shocks or damages to the instrument.
Fig. 4: Using the instrument for DC Current measurement
1. Power off the circuit under test.
” is shown at display.
2. Selecting the position
. The message “
3. Insert the test leads into the jacks, the red plug into A jack and black plug into COM
jack (see Fig. 4).
4. Connect the red and the black plugs in series with the circuit whose current is to be
measured respecting the polarities.
5. Energize the circuit under test. The current value will be displayed.
6. The message "O.L." means that the detected current exceeds the limits.
7. If the measured value is lower than 4mA, to get a better resolution:
• Switch off the circuit under test.
• Turn the selector on µA.
• Remove the red test lead from A jack, and insert it into
HzVΩµA jack and power
the circuit under test. Press R/SEL key if necessary to select an higher range.
8. The symbol "-" on the instrument display indicates that current has opposite direction
with regard to the connection.
9. For HOLD function, Minimum and Maximum value measurement and Relative measure
please refer to paragraph 4.2.
11
TM-87/TM-88
4.3.4.
AC Current measurement
CAUTION
The maximum input for DC current is 10A. Do not attempt to measure
higher currents to avoid electrical shocks or damages to the instrument.
Fig. 5: Using the instrument for AC Current measurement
1. Power off the circuit under test.
2. Selecting the position A. By pressing R/SEL key to select AC measurement. The
“
” symbol is shown at display.
3. Insert the test leads into the jacks, the red plug into A jack and black plug into COM
jack (see Fig. 5).
4. Connect the red and the black plugs in series with the circuit whose current is to be
measured.
5. Energize the circuit under test. The current value will be displayed.
6. The message "O.L." means that the detected current exceeds the limits.
7. If the measured value is lower than 4mA, to get a better resolution:
• Switch off the circuit under test.
• Turn the selector on
µA.
• Remove the red test lead from A jack, and insert it into
HzVΩµA jack and power
the circuit under test. Press R/SEL key if necessary to select an higher range.
8. For HOLD function, Minimum and Maximum value measurement, Peak measurement
(for
µA position) and for Relative measurement (for A position) please refer to
paragraph 4.2.
12
TM-87/TM-88
4.3.5.
Resistance measurement and Continuity Test
CAUTION
Before taking resistance measurements on the circuit remove power from
the circuit being tested and discharge all capacitors.
Fig. 6: Using the instrument for Resistance measurement and Continuity test
1. Selecting the position Ω
.
2. Insert the test leads into the jack, the red plug into HzVΩµA jack and black plug into
COM jack (see Fig. 6).
3. Connect the test leads to the circuit under test. The resistance value is displayed.
4. Pressing the R/SEL key to select the correct range or using the Autorange feature (see
paragraph 4.2.4). If the resistance value under test is unknown, select the highest
range.
5. If the message "O.L" is displayed a higher range must be selected.
6. The continuity test is always active and the test is performed using the test leads in the
same way of resistance measurement. The buzzer is on for resistance values <35Ω.
7. For HOLD function, Minimum and Maximum value measurement and Relative measure
please refer to paragraph 4.2.
13
TM-87/TM-88
4.3.6.
Diode test
CAUTION
Before taking diode test on remove power from the circuit being tested and
discharge all capacitors.
Fig. 7: Using the instrument for Diode test
1. Selecting the position
.
2. Insert the test leads into the jacks, the red plug into HzVΩµA jack, and black plug
into COM jack.
3. Connect the test leads to the diode under test observing the proper polarities (see Fig. 7).
The threshold voltage value of direct polarization is shown at display. The meter
displays the diode voltage to approximately 0.4 ~ 0.9V for good junction.
4. If the threshold voltage value is 0V the diode P-N junction is shorted circuit.
5. If the message “ O.L." is displayed the diode terminals are reversed or the diode P-N
junction is damaged.
6. For HOLD function, Minimum and Maximum value measurement and Relative measure
please refer to paragraph 4.2.
14
TM-87/TM-88
4.3.7.
Capacitance measurement
CAUTION
Before taking capacitance measurements in circuit remove power from the
circuit being tested and discharge all capacitors. Use the short test lead pair
for measurement to reduce the stray capacitance. Before connecting the
test capacitor observe the display, which may have a reading other than
zero every time the range is changed. Subtract this offset reading from the
displayed reading of the test result of a capacitor to obtain the true value.
Connect the test capacitor to the inputs respecting the polarity connections
when required. Due to internal delay time, bargraph it’s no operative in
capacitance measurement.
Fig. 8: Using the instrument for Capacitance measurement
1.
2.
3.
4.
5.
6.
Selecting the position .
Insert the test leads into the jacks, the red plug into HzVΩµA jack and black plug
into COM jack (see Fig. 8).
Connect the red and black test clamps to the capacitor terminals respecting if
necessary the proper polarities. The capacitance value is shown on display.
Pressing the R/SEL key to select the correct range or using the Autorange feature
(see paragraph 4.2.4). If the capacitance value under test is unknown, select the
highest range.
If the message "O.L" is displayed the maximum readable value is reached.
For HOLD function, Minimum and Maximum value measurement and Relative
measure please refer to paragraph 4.2.
15
TM-87/TM-88
4.3.8.
Frequency measurement
CAUTION
The maximum input for AC voltage is 750Vrms. Do not attempt to measure
higher voltages to avoid electrical shocks or damages to the instrument.
Fig. 9: Using the instrument for Frequency measurement
1. Selecting the position Hz.
2. Insert the test leads into the jacks, the red plug into HzVΩµA jack and black plug into
COM jack (see Fig. 9).
3. Connect the test leads to the circuit under test. The frequency value will be displayed.
4. Pressing the R/SEL key to select the correct range or using the Autorange feature (see
paragraph 4.2.4). If the freqency value under test is unknown, select the highest range
5. If the message "O.L" is displayed the maximum readable value is reached.
6. For HOLD function, Minimum and Maximum value measurement and Relative measure
please refer to paragraph 4.2.
16
TM-87/TM-88
4.3.9.
Temperature test (Only for TM-88)
CAUTION
The maximum input of AC voltage is 24Vrms DC voltage is 60V. Do not
attempt to measure higher voltages to avoid electrical shocks or damages
to the instrument.
Fig. 10 : Using the instrument for Temperature test
1. Selecting the position ℃/℉.
2. Pressing the R/SEL key to select the℃ and ℉ readings.
3. Insert the banana plug adapter T10 with correct +plug into VΩ
HzµA℃℉ jack,
and -plug into COM jack. with banana pins to K-type socket to adapt other standard
K-type mini plug temperature probes.
4. Connect the other ends of temperature test leads for temperature measurement.
17
TM-87/TM-88
5. MAINTENANCE
5.1. GENERAL INFORMATION
This is a precision instrument. To guarantee its performances be sure to use it according to
these instructions and keep it stored on suitable environmental conditions Do not expose it to
high temperatures or humidity or direct sunlight. Be sure to turn it off after use. If you
expect not to use the instrument for a long period remove batteries to avoid leakages of
battery liquid which could damage its inner components.
5.2. BATTERY REPLACEMENT
When the low battery indication “ ” is shown the battery it’s to be replaced.
CAUTION
Only skilled technicians can open the instrument and replace batteries.
Before removing batteries disconnect the test leads from the input terminals
to avoid electrical shocks.
LEGEND:
1. Disconnect the test leads from the
input terminals.
2. Remove the fixing screws from the
back case and detach it.
3. Remove the battery replacing it with
new one (9V NEDA1604, JIS006P,
IEC6F22) respecting the polarity
signs and replace the back case
and screws. Use the appropriate
battery disposal methods for your
area.
Fig. 10: Battery replacement
18
TM-87/TM-88
5.3.
FUSE REPLACEMENT
CAUTION
Before replacing fuses, disconnect test leads from any energized circuit to
avoid electrical shock.
LEGEND:
1. Turn
OFF
the
meter
and
disconnect the test leads from the
input terminals.
2. Unscrew the four fixing screws of
the back holster and remove it.
3. Remove the defective fuse and
install a new fuse of the same size
and
rating
(fast
10A/1000V
Bussmann type). Make sure the
new fuse is centered in the fuse
holder. Re-screw the back holster.
Fig. 11: Fuse replacement
5.4. CLEANING
To clean the instrument use a soft dry cloth. Never use a wet cloth, solvents or water.
5.5.
END OF LIFE
Caution: this symbol indicates that equipment and its accessories shall be
subject to a separate collection and correct disposal.
19
TM-87/TM-88
6. TECHNICAL SPECIFICATIONS
6.1. TECHNICAL FEATURES
The accuracy is indicated as [% of reading + number of digits] at 23°C±5°C, < 80%HR
DC Voltage
Range
Resolution
Accuracy
400.0mV
4.000V
40.00V
400.0V
1000V
0.1mV
0.001V
0.01V
0.1V
1V
±(0.5%rdg + 3dgt)
±(0.5%rdg + 2dgt)
Input impedance
Overload
protection
10MΩ // <100pF
1000VDC
750VACrms
Input impedance
Overload
protection
10MΩ // <100pF
1000VDC
750VACrms
±(1.0%rdg + 2dgt)
AC TRMS Voltage
Range
Resolution
400.0mV
0.1mV
4.000V
0.001V
40.00V
400.0V
750V
Accuracy
(50÷500Hz)
Not declared
±(1.3%rdg + 5dgt)
(50÷300Hz)
0.01V
0.1V
1V
±(1.5%rdg + 3dgt)
(50÷500Hz)
Range
Resolution
Accuracy (*)
Output voltage
Overload
protection
400.0µA
4000µA
10.00A
0.1µA
1µA
0.01A
±(1.0%rdg + 2dgt)
<5mV/µA
750Vrms
2V max
Fuse 10A/1000V
DC Current
AC TRMS Current
Range
Resolution
Accuracy
(50÷500Hz)
Output voltage
Overload
protection
400.0µA
4000µA
0.1µA
1µA
±(1.2%rdg + 5dgt)
<5mV/µA
750Vrms
0.01A
±(1.5%rdg+5dgt)
(50 ÷ 399Hz)
±(2.0%rdg+5dgt)
(400 ÷ 500Hz)
2Vmax
Fuse 10A/1000V
Range
Resolution
Accuracy
Overload
protection
400.0Ω
4.000kΩ
40.00kΩ
400.0kΩ
4.000MΩ
40.00MΩ
0.1Ω
0.001kΩ
0.01kΩ
0.1kΩ
0.001MΩ
0.01MΩ
±(1.0%rdg + 5dgt)
Max Open
Circuit Voltage
about 1.3V
10.00A
Resistance
±(0.8%rdg + 2dgt)
about 0.45V
±(1.0%rdg + 2dgt)
±(1.5%rdg + 5dgt)
20
600Vrms
TM-87/TM-88
Diode Test
Feature
Resolution
10mV
Accuracy
(0.4 ÷ 0.8V)
±(1.5%rdg + 5dgt)
Test
current
Open
voltage
Overload
protection
1.5mA
<3V
600Vrms
Continuity Test
Feature
Buzzer
Open voltage
<35Ω
about 1.3V
Overload
protection
600Vrms
Accuracy
Sensitivity
Overload protection
Frequency
Range
4.000kHz
40.00kHz
400.0kHz
4.000MHz
40.00MHz
400.0MHz
Resolution
0.001kHz
0.01kHz
0.1kHz
0.001MHz
0.01MHz
0.1MHz
±(0.1%rdg + 2dgt)
>1.5VACrms
<5VACrms
600Vrms
>2VACrms
<5VACrms
Not declared
Minimum pulse duration: 25ns
30% ≤ Duty Cycle ≤70%
Capacitance
Range
4.000nF
40.00nF
400.0nF
4.000µF
40.00µF
400.0µF
4.000mF
40.00mF
Resolution
0.001nF
0.01nF
0.1nF
0.001µF
0.01µF
0.1µF
0.001mF
0.01mF
Accuracy
Overload protection
Not declared
±(2.0%rdg + 8dgt)
600Vrms
±(5.0%rdg+20dgt)
Temperature
Use T10 adapter and K-type probe (only TM-88)
Range
Resolution
Accuracy
-40℃~0℃±(1.8%rdg + 3℃)
℃
1℃
1℃~400℃±(1.0%rdg +3℃)
℉
1℉
401℃~800℃±(2.0%rdg +3℃)
-40℉~32℉±(1.8%rdg + 5℉)
33℉~778℉±(1.0%rdg +5℉)
779℉~1382℉±(2.0%rdg +5℉)
The tolerance of temp probe excluded.
21
Overload protection
Max.
input
voltage
for
thermocouple:DC60V/AC24V.
TM-87/TM-88
6.1.1. Electrical specifications
Conversion:
Measuring rate:
Temperature coefficient:
NMRR Normal Mode Rejection Ratio:
CMRR Common Mode Rejection Ratio:
6.1.2. Safety
The instrument complies to:
Insulation:
Pollution degree:
Overvoltage category:
Max height:
TRMS
1.5 times per second
0.15×(accuracy)/°C (<18°C and >28°C)
> 50dB for DC parameters and 50/60Hz
>100dB from DC up to 60Hz on DCV
> 60dB from DC up to 60Hz on ACV
EN 61010-1
Class 2, Double insulation
2
CAT IV 600V, CAT III 1000V (V/Ω/µA)
2000m
22
TM-87/TM-88
6.1.3. General data
Mechanical characteristics
Dimensions:
Weight (including batteries):
Power supply
Battery type:
Indication of low batteries:
Battery life:
Auto power OFF:
Display
Specifications:
163(L) x 88(W) x 48(H)mm
approx. 400g
1 x 9V battery NEDA1604, JIS006P, IEC6F22
the symbol " " is displayed when batteries are
low.
approx. 300 hours
after 30 minutes
Out of range indications:
4 LCD with max. reading 3999 counts + symbol
decimal point sign and bargraph
“OL” or “-OL”
6.2. ENVIRONMENT
6.2.1. Environmental conditions
Reference temperature:
Working temperature:
Relative humidity:
Storage temperature:
Storage humidity:
23° ± 5°C
0 ÷ 30°C
<80%HR
-20 ÷ 60°C
<80%HR
6.2.2.
EMC and LVD
This meter is designed and tested in compliance to the requirements of the
European EMC Directive 89/336/EEC modified with 93/68/CEE and in accordance to
Low Voltage Directive 73/23/EEC
6.3. ACCESSORIES
6.3.1. Standard accessories
The package contains:
• Pair of test leads
• User’s manual
• Battery
• Carrying Case
23
TM-87/TM-88
7. SERVICE
7.1. WARRANTY CONDITIONS
This instrument is guaranteed against material or production defects, in accordance with
our general sales conditions. During the warranty period the manufacturer reserves the
right to decide either to repair or replace the product.
Should you need for any reason to return back the instrument for repair or replacement
take prior agreements with the local distributor from whom you bought it. Do not forget to
enclose a report describing the reasons for returning (detected fault). Use only original
packaging. Any damage occurred in transit due to no original packaging will be charged
anyhow to the customer.
The manufacturer will not be responsible for any damage to persons or things.
The warranty doesn’t apply to:
• Accessories and batteries (not covered by warranty).
• Repairs made necessary by improper use (including adaptation to particular
applications not provided in the instructions manual) or improper combination with
incompatible accessories or equipment.
• Repairs made necessary by improper shipping material causing damages in transit.
• Repairs made necessary by previous attempts for repair carried out by unskilled or
unauthorized personnel.
• Instruments for whatever reason modified by the customer himself without explicit
authorization of our Technical Dept.
The contents of this manual may not be reproduced in any form whatsoever without the
manufacturer’s authorization.
Our products are patented and our logotypes registered. We reserve the right to
modify specifications and prices in view of technological improvements or
developments which might be necessary.
7.2. AFTER-SALE SERVICE
Shouldn’t the instrument work properly, before contacting your distributor make sure that
batteries are correctly installed and working, check the test leads and replace them if
necessary. Make sure that your operating procedure corresponds to the one described in
this manual.
Should you need for any reason to return back the instrument for repair or replacement
take prior agreements with the local distributor from whom you bought it. Do not forget to
enclose a report describing the reasons for returning (detected fault). Use only original
packaging. Any damage occurred in transit due to non original packaging will be charged
anyhow to the customer.
The manufacturer will not be responsible for any damage to persons or things.
24
TENMARS ELECTRONICS CO., LTD
6F, 586, RUI GUANG ROAD, NEIHU,
TAIPEI 114, TAIWAN.
E-mail: service@tenmars.com
http://www.tenmars.com
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