90B 6000 DIGITS AUTO CAL
DIGITAL MULTIMETER OPERATOR’S MANUAL
1. Overview
The multimeter is characterized at slim size, portable, stable performance and
anti-dropping capacity. Using 6000 digits LCD monitor with character 22mm 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 & AC current, resistance,
capacitor, Frequency, positive diode voltage fall,Battery power, Temperature and
Continuity.
2. Panel Layout
①LCD Display: 6000 digits, full function symbol display
②SELECT key:This key work on the "CAP Ω" range , Push the key to choose
resistance, diode ,continuity test, on the voltag or current range,change to DC/AC,
and ℃/℉ range , change to ℃/℉
③ Hz/DUTY Key: In “ACV/ACA” or “Hz” range, push the key, you can measure
the Hz ,push again, can measure the duty.
④ HOLD/ Back Light key：In any range, push the key, the present display value will
be locked and the " H " symbol will appear, push it again to exit HOLD and the "
H"symbol disappear. Press “HOLD” button more than 2 seconds, the back light will
light, press it more than 2 seconds again, the back light will light off.
⑸ MAX/MIN key：Push the key to select MAX mode, push it again to change MIN
mode, push once again to change max-min,press the key for more than 2 seconds
to go back auto range mode. And Push the key to change manual range mode .But
in Hz/Duty and Capacitance measurement, it can not use.
⑥REL Key: Pressing this button, the meter enters relative measuring mode, “REL”
is displayed on the LCD and the present reading becomes the reference value and
displayed on the display. Relative measurement REL△ =measurement
value-Reference value.
⑦ RANGE Key: Pressing this button, the meter enters mancal range mode, press
it more than 2 seconds again, return to auto mode
⑧Rotary Switch: use this switch to select functions and ranges
⑨ Illuminative window
⑩V ΩInput Jack、10A Input Jack、mA Input Jack 、COM Input Jack
3. Safety Information
3-1 The meters are designed according to IEC-1010 concerning electronic
measuring instruments with an over-voltage category 600V (CAT IV)/1000V(CAT III)
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 avid risk of electric shock, do not use the meters before the cover is in place.
4-3 The Rotary switch should be 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 Rotary switch position is forbidden to be changed at random during
measurement.
4-7 Take caution against shock in the course of measuring voltage higher than DC
60V & AC 30V.
4-8 Protection fuse should be replaced only with same type and same specification.
4-9 After operation is finished, set function switch at OFF range to save battery power.
4-10 If the meter is without usage for long time, take out battery to avoid damage
by battery leakage.
5. GENERAL SPECIFICATIONS
5-1 Max Voltage between input terminal and Earth Ground: CAT Ⅳ 600V
5-2 Over-range Indication: display “OL” for the significant digit.
5-3 Automatic display of negative polarity “_” .
5-4 Low Battery Indication: „ ‟ displayed
5-5 Max LCD display: 6000 digits; capacitor, Frequency range: 9999 digits
5-6 auto ranges
5-7 Fuse protection: F-800mA/1000V (Ø 6x32mm) F-10A/1000V (Ø 10x38mm)
5-8 Power Supply: 9V Zinc-carbon battery
5-9 auto power-off：15minites,Push SELECT Key,Atuo power Off disable;
5-10 Operating Temp.: 0℃ to 40℃ (relative humidity <85%)
5-11 Storage Temp.:-10℃ to 50℃ ((relative humidity <85%)
5-12 Guaranteed precision Temp.: 23± 5 ℃ (relative humidity <70%)
5-13 Dimension: 193×88× 41mm
Weight: approx.320g (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 70%.
6-1 DC Voltage
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