Tenma 72-9490 User manual

72-9490

TABLE OF CONTENTS
TITLE
PAGE
72-9490: OPERATING MANUAL
1
Overview
Unpacking Inspection
Safety Information
Rules For Safe Operation
International Electrical Symbols
The Meter Structure
A.The Meter Front Structure
B.The Meter Back and Bottom Structure
Functional Buttons
Display Symbols
Measurement Operation
A. AC Voltage + Frequency Measurement
B. AC Current + AC Voltage Measurement
C. Active Power + Phase Angle Measurement
D. Apparent Power + Reactive Power Measurement
E. Power Factor + Phase Angle Measurement
F. Active Energy + Time Measurement
True RMS Measurement and Average Value Measurement
Specifications
3
4
5
6
8
9
9
11
12
15
17
17
19
20
28
30
32
33
35

2
35
36
37
37
37
37
38
39
40
40
41
41
42
42
43
72-9490: OPERATING MANUAL
TABLE OF CONTENTS
TITLE PAGE
A. General Specifications
B. Environmental Requirements
Accuracy Specifications
A. AC Voltage
B. Frequency
C. AC Current
D. Active Power
E. Apparent Power
F. Reactive Power
G. Power Factor
H. Phase Angle
I. Active Energy
Maintenance
A. General Service
B. Replacing the Battery

72-9490: OPERATING MANUAL
3
The Meter can measure Voltage, Current, Active Power, Apparent Power, Reactive Power, Power Factor, Phase Angle,
Frequency, Active Energy and etc.
Model 72-9490 is a three phase intelligent handheld digital power clamp meter (hereafter referred to as “the Meter”)
which has both the features of digital current meter and also power measurement meter.
Warning
This Operating Manual covers information on safety and cautions. Please read the relevant information carefully
and observe all the Warnings and Notes strictly.
Overview
To avoid electric shock or personal injury, read the “Safety Information” and “Rules for Safe Operation” carefully before
using the Meter.

Item
1
2
3
4
5
6
7
8
9
10
11
12
13
Description
English Operating Manual
Red Test Lead
Black Test Lead
Blue Test Lead
Yellow Test Lead
Red Alligator Clip
Black Alligator Clip
Blue Alligator Clip
Yellow Alligator Clip
USB Interface Cable
Software
Tool Box
1.5V Battery (LR6)
Qty
1 piece
1 piece
1 piece
1 piece
1 piece
1 piece
1 piece
1 piece
1 piece
1 piece
1 piece
1 piece
4 pieces
In the event you find any items are missing or damaged, please contact your dealer immediately.
Open the carton and remove the Meter. Check the following items carefully to see if any items are missing or damaged.
Unpacking Inspection
4
72-9490: OPERATING MANUAL

72-9490: OPERATING MANUAL
5
This Meter complies with the Safety/ Compliances: IEC 61010 CAT. III 600V, CAT. IV 300V overvoltage and double
insulation standard, pollution degree 2.
CAT. III: Distribution level, fixed installation, with smaller transient overvoltages than CAT. IV
CAT.IV: Primary supply level, overhead lines, cable systems etc.
Use the Meter only as specified in this operating manual to avoid personal injury or damage to your Meter or device under
test.
In this manual, a Warning identifies conditions and actions that pose hazards to the user, or may damage the Meter
or device under test.
International electrical symbols used on the Meter and in this Operating Manual are explained.
Safety Information

6
72-9490: OPERATING MANUAL











Before using the Meter, inspect the case. Do not use the Meter if it is damaged or the case (or part of the
case) is removed. Look for cracks or missing plastic. Pay attention to the insulation around the connectors.
Inspect the test leads for damaged insulation or exposed metal. Replace damaged test leads with identical
model number or electrical specifications before using the Meter.
Do not apply more than the rated voltage, as marked on the Meter.
When your measurements have been completed, disconnect the connection between the test leads and
the circuit under test, remove the test leads from the input terminals of the Meter and turn the Meter
power off.
Do not carry out the measurement when the Meter’s back case and / or battery door is opened to avoid
electric shock.
When the Meter is operating at an effective voltage over 30V in AC, special care should be taken.
Use the proper terminals and function for your measurements.
Do not use or store the Meter in an environment of high temperature, humidity, explosive, flammable
and strong magnetic field. The performance of the Meter may deteriorate if damp or wet.
Do not use the Meter if its surface is wet or the user’s hands are wet.
When using the test leads, keep your fingers behind the finger guards.
Replace the battery as soon as the battery indicator appears. With a low battery, the Meter might
produce false readings that can lead to electric shock and personal injury.
Warning
Rules For Safe Operation
To avoid possible electric shock or personal injury, and to avoid possible damage to the Meter or to the equipment
under test, adhere to the following rules:

72-9490: OPERATING MANUAL
7







When opening the battery door, make sure the Meter is off.
When servicing the Meter, use only the same model number or identical electrical specifications
replacement parts.
Do not tamper with the internal circuits of the Meter.
Soft cloth and mild detergent should be used to clean the surface of the Meter when servicing. No abrasive
and solvent should be used to protect the surface of the Meter from corrosion, damage and accident.
The Meter is suitable for indoor use only.
Turn the Meter off when it is not in use and take out the battery when not using for a long time.
Periodically check the battery as it may leak when it has not been in use for some time, replace the battery
if the battery is dead or leaking. A leaking battery will damage the Meter.

8
72-9490: OPERATING MANUAL
International Electrical Symbols
AC (Alternating Current)
Grounding
Double Insulated
Warning. Refer to the Operating Manual
Deficiency of Built-In Battery
Danger of High Voltage
Conforms to Standards of European Union

72-9490: OPERATING MANUAL
9
1
2
3
4
5
6
7
8
9
10
11
12
13
Transformer Jaw: designed to pick up the AC
and DC current flowing through the conductor.
The tested conductor must vertically go through
the Jaw center.
Hand Guards.
Power button
Max/ button
MENU button
LOAD button (recall data)
SELECT button (press to select alternate
function and sum of Watts measurement)
MIN/ button
V3 Input Terminal (Third phase measurement)
V2 Input Terminal (Second phase measurement)
V1 Input Terminal (First phase measurement)
COM Input Terminal
CLEAR button (maximum and minimum)
Figure 1
Black Red Blue Yellow
A. The Meter Front Structure (see figure 1)
The Meter Structure

10
72-9490: OPERATING MANUAL
14
15
16
17
18
19
20
Sigma button (Sum)
SAVE button (data store button)
USB button
LIGHT button (auto display backlight button)
HOLD button
LCD Display
Testing Leads (Red, Black, Blue and Yellow)

72-9490: OPERATING MANUAL
11
1 Infrared slot
2 USB Interface Cable
Figure 2
B. The Meter Back and Bottom Structure
(see figure 2)

12
72-9490: OPERATING MANUAL
MAX/
Press MENU to display the following functions in sequence:
AC Voltage (main display) + Frequency (secondary display)
AC Current (main display) + AC Voltage (secondary display)
Active power (main display) + Phase angle (secondary display)
Apparent power (main display) + Reactive power (secondary display)
Power factor (main display) + Phase angle (secondary display)
Active Energy (main display) + Time (secondary display)
Press LIGHT to turn the display backlight on.
The display backlight will be off automatically after 30 seconds.
Press HOLD to enter the Hold mode in any mode, appears and the Meter beeps.
Press HOLD again to exit the Hold mode to return to measurement mode, the Meter beeps and
disappears.
Press and hold POWER for 1 second to turn the Meter on.
Press POWER again to turn the Meter off.
Button
POWER
HOLD
LIGHT
MENU
Operation Performed
The table below describes the function of the main button operations.
Functional Buttons
Press to start recording of maximum value, it valid at voltage, current, active power and apparent power
ranges only.
Press once at LOAD mode, MR icon shown, the Meter displays the next stored reading, the left
secondary display showing the index increase one.
Press once at mode, CAL icon shown, the Meter steps through sum of active power (main display) +
sum of reactive power (secondary display) and sum of power factor (main display) + sum of apparent
power.

At active power (main display) + phase angle (secondary display) mode, press SELECT button to step
through first phase, second phase, third phase and sum of watts.
At other mode, press SELECT to step through first phase, second phase and the third phase.
At Active power (main display) + Phase angle (secondary display) mode, press once button to sum up the
current first phase of 3 phase measurement result. Then carry out second phase power measurement.
Press again to sum up the second phase power measurement result, then carry out third phase power
measurement.
Press again to sum up the third phase power measurement result, then press SELECT to enter the
measurement of sum of the watts mode, the display shows the 3 phase sum of the watts value.
72-9490: OPERATING MANUAL
13
SELECT
LOAD
Press USB once to turn the USB interface on, USB appears and the Meter beeps.
Press USB again to turn the USB interface off, USB disappears and the Meter beeps.
Press once to enter LOAD mode, MR appears and the Meter beeps.
Press again to exit LOAD mode, MR disappears and the Meter beeps.
Press and hold LOAD for 1 second to display the stored data quickly.
Press once to store single reading, MEM appears and the Meter beeps.
Press and hold for over 1 second to continuous store reading, MEM blinks and the Meter beeps. The index
number shown on the left secondary display keep on increasing. Press SAVE again to exit. The maximum
number of data store is 99, when it achieves 99, the Meter shows FUL. Press CLEAR to clear the stored
reading in order to store next reading.
Button Operation Performed
USB
SAVE

14
72-9490: OPERATING MANUAL
At active energy range, press to reset time the zero, then restart the timing.
At all other ranges, press to clear stored readings.
MIN / Press to start recording of minimum value, it valid at voltage, current, active power and apparent power
ranges only.
Press once at LOAD mode, MR icon shown, the Meter displays the next stored reading, the left secondary
display showing the index decrease one.
Press once at mode, CAL icon shown, the Meter steps through sum of active power (main display) +
sum of reactive power (secondary display) and sum of power factor (main display) + sum of apparent power.
Button Operation Performed
CLEAR

72-9490: OPERATING MANUAL
15
Display Symbols (see figure 3)
Figure 3
1
2
3
4
5
6
7
8
9
10
11
Meaning
Data is transferring via USB
Indicator for DC measurement
First phase symbol
Second phase symbol
Third phase symbol
Unit for hour
Unit for minute
Watt: Sum of Watt
The battery is low.
Warning: To avoid false
readings, which could lead to
possible electric shock or
personal injury, replace the
battery as soon as the battery
indicator appears.
Unit for second
Symbol of Unit.
Hz: Hertz.The unit of frequency.
PG: The unit of phase angle
KVAr. The unit of reactive power
Symbol
USB
DC
1
2
3
h
mm
W
s
Hz,
PG,
KVAr
Number

16
72-9490: OPERATING MANUAL
Number
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
Meaning
Minimum reading
Analog Bar Graph
Overloading
Ruler
Maximum reading
Indicator for clear the stored reading
Ruler negative symbol
High voltage symbol
Indicates negative reading
Indicator for AC voltage or current
Indicator for recall the stored reading
Frequency symbol
Indicator for data store
Indicator for data stored is full
Data hold is active
Symbol
MIN
MAX
CLR
AC
MR
FREQ
MEM
FUL

72-9490: OPERATING MANUAL
17
Figure 4
Black
Red
Blue
Yellow
Measurement Operation
Starting Your Meter
Press and hold POWER for one second to turn the
Meter on. The default range is the last measurement
range when you turned off the Meter.
Replace the battery as soon as the battery indicator
“” appears on the display.
A. AC Voltage (main display) + Frequency
(secondary display) Measurement (see figure 4)

18
72-9490: OPERATING MANUAL
1. Insert the red test lead into the V1 terminal, blue test lead into the V2 terminal, yellow test lead to V3 input terminal
and black test lead to the COM input terminal.
2. Press the MENU to select Voltage (main display) + Frequency (secondary display) range.
3. Connect the red test leads ( V1 input terminal), blue test leads ( V2 input terminal) and yellow test leads( V3 input
terminal) to the corresponding three phases loaded live wire. Connect the black test lead (COM input terminal) to
the corresponding three phases loaded neutral wire.
4. Press SELECT to select phase location, the display shows the corresponding phase symbol. V1 means the first phase
1, V2 means the first phase 2, V3 means the first phase 3.
5. The display shows the corresponding True RMS voltage value and frequency value of each phase.
6. Press MAX/ , the LCD displays MAX, it starts recording the maximum AC voltage True RMS value. Press MAX/
again to show the current AC voltage True RMS value.
7. Press MAX/ the LCD displays MAX, it starts recording the minimum AC voltage True RMS value. Press MAX/
again to show the current AC voltage True RMS value.
8. The display shows OL when the input voltage is higher than 600V rms.
Note
When the measurement has been completed, disconnect the connection between the testing leads and the circuit under
test and remove testing leads from the input terminals.
The AC Voltage ranges are:15V, 100V, 300V and 600V
The frequency range is:20Hz~500Hz
To measure AC voltage + frequency, connect the Meter as follows:

72-9490: OPERATING MANUAL
19
1. Press the MENU to select AC Current (main display)
+ AC Voltage (secondary display) range.
2. Press the lever to open the transformer jaw.
3. Center the conductor within the transformer jaw,
then release the Meter slowly until the trasnformer
jaw is completely closed, Make sure the conductor
to be tested is placed at the center of the transformer
jaw, otherwise it will casue deviation. The Meter
can only measure one conductor at a time, to
meausre more than one condutor at a time will
cause deviation.
4. The double display shows the AC current True
RMS value and AC voltage True RMS value.
5. Press MAX/ , the LCD displays MAX, it starts
recording the maximum AC current True RMS value.
Press MAX/ again to show the present AC True
RMS value.
B. AC Current (main display) + AC Voltage
(secondary display) Measurement (see figure 5)
Figure 5
The AC current ranges are: 40A, 100A, 400A and 1000A
The AC Voltage ranges are: 15V, 100V, 300V and 600V
To measure AC current + AC voltage, connect the Meter
as follows:
Black
Blue