1
DMM OPERATOR’S MANUAL
A960T
1. Overview
The DMM are characterized at slim size, portable, stable
performance and anti-dropping capacity. Using 3½ digits LCD
monitor with character 15mm high, they offer clear readings.
With overall circuitry design centering on large-scale IC A/D
converters in conjunction and over-load protection circuit, the
meters give excellent performance and exquisite making as a
handy utility instrument.
The meters can be used to measure DC & AC voltage, DC
current, resistance, positive diode voltage fall, hFE parameters
for transistor and Continuity.
2. Panel Layout
1
LCD
Display:
3½
digits,
character 15mm high
2
Back Light Button Switch:
Press this button to switch on
back
light
If
the
dark
circumstance light makes the
reading
difficulty
when
measuring, the light will be
automatically turned off in 5
seconds. Press again to switch
it on again. If the battery is in
weak power, the light will be
dimmed.
3
Data-hold Switch (HOLD)
4
Power
5
Rotary Switch: use this switch to select functions and
ranges
6
“10A”Input Jack
7
hFE test jack
8
“COM”Input Jack
9
“VΩmA” Input Jack
3. Safety Information
3-1 The meters are designed according to IEC-1010 concerning
electronic measuring instruments with an over-voltage
category (CAT II) and pollution 2.
3-2 Follow all safety and operating instructions to ensure that
the meter is used safely and is kept in good operating
condition.
3-3 safety symbols:
important safety information, refer to the operating manual.
Dangerous voltage may be presence.
Double insulation (protection Class II)
4. Special Cautions for Operation
4-1 The meters can be safe only according to standard
procedures when used in conjunctions with the supplied
test leads. To replace damaged test leads with only the
same model or same electric specifications.
4-2
To aveid risk of electric shock, do not use the meters
before the cover is in place.
4-3 The range switch should be at right position for the testing.
4-4 To avoid electric shock and damaging the instruments, the
input signals are forbidden to exceed the specified limits.
4-5
When measuring TV set or switched power, attention
should be paid to the possible pulses that may bring
destruction to the circuit.
4-6
Range switch position is forbidden to be changed at
random during measurement.
4-7 Take caution against shock in the course ot measuring
voltage higher than DC 60V & AC 30V.
4-8 Protection fuse should be replaced only with same type
and same specification.
5. GENERAL SPECIFICATIONS
5-1 Max Voltage between input terminal and Earth Ground: CAT
II 600V
5-2 Over-range Indication: display “1” or “-1” for the significant
digit.
5-3 Automatic display of negative polarity “ - ” .
5-4 Low Battery Indication: ‘ ’ displayed
5-5 Max LCD display:
1999 (3
1
/
2
digits)
5-6 Fuse protection:
F-200mA/250V (Ø5x20mm)
5-7 Power Supply:
9V battery, 6F22 or NEDA 1604
5-8 Operating Temp.:
0
℃
to 40
℃
(relative humidity <85%)
5-9 Storage Temp.:
-10
℃
to 50
℃
((relative humidity
<85%)
5-10 Guaranteed precision Temp.: 23±5
℃
(relative humidity <85%)
5-11 Dimension:
69x138x31mm (with holster)
5-12 Weight: approx: 170g (including battery)
6. Testing Specifications
Accuracy is specified for a period of year after calibration
and at 18
℃
to 28
℃
(64
℉
to 82
℉
) with relative humidity to
75%.
6-1 DC Voltage
Range
Resolution
Accuracy
200mV
0.1mV
±(0.5% of rdg + 2 digits)
2V
1mV
20V
10mV
200V
100mV
±(0.8% of rdg + 3 digits)
500V
1V
-- Input Impendence: 1MΩ
-- Overload protection: 250V for 200mV range, effective DC or
AC 600V for other ranges
6-2 AC Voltage
Range
Resolution
Accuracy
200V
0.1V
±(1.2% of rdg + 10 digits)
500V
1V
-- Frequency Range: 40 to 400Hz
-- Response: average, calibrated in rms of sine wave
6-3 DC Current
Range
Resolution
Accuracy
200μA
0.1μA
±(1.0% of rdg + 2 digits)
2mA
1μA
20mA
10μA
200mA
100μA
±(1.5% of rdg + 2 digits)
10A
10mA
±(3.0% of rdg + 5 digits)
-- Overload protection: F 200mA/250V fuse
Note:
10A range: not fused
6-4 Resistance
Range
Resolution
Accuracy
200Ω
0.1Ω
±(0.8% of rdg + 3 digits)
2KΩ
1Ω
20KΩ
10Ω
200KΩ
100Ω
2MΩ
1KΩ
±(1.0% of rdg + 3 digits)
-- Over-load protection: 250V effective value
6-5 Transistor hFE Test
Range
Test Range
Test Current / voltage
NPN & PNP
0-1000
I
b
=10µA / Vce=3V
6-6 Diode Test
Range
Resolution
Function
1mV
Display: read approximate
forward voltage of diode
-- Over-load Protection: 250V effective value
-- Forward DC current: approximate 1mA
-- Reversed DC voltage: approximate 3.0V
6-7 Continuity
Range
Function
Built-in buzzer will sound if resistance is
less than 60Ω±30Ω
-- over-load protection: 250V effective value
--open circuit voltage: approximate 3.0V
6
-8 Temperature
Range
Resolution
Accuracy
-20
℃
-750
℃
1
℃
±(1.0% of rdg + 2 digits)
-- over-load protection: 250V effective value
7. OPERATING INSTRUCTIONS
7-1 Attention before operation
7-1-1 Check 9V battery. If the battery voltage is less than 7V,
display will show “
”, the battery should be replaced at
this time to ensure measuring precision.
7-1-2 Pay attention to the “
” besides the input jack which
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