HoldPeak 770G User manual

770G
DIGITAL MULTIMETER
OPERATOR’S MANUAL
1. Overview
The multimeter is characterized at slim size, portable, stable performance and anti-dropping
capacity. Using 4000 counts digit 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, duty cycle, temperature, transistor hFE, Non Contact AC Voltage (NCV) detection,
positive diode voltage fall and audible continuity.
2. Panel Layout
1NCV detection area: Non Contact AC Voltage (NCV) detection area.
2CDS sensor: The CDS sensor can reaction to the ambient brightness range, then
automatically control the LCD backlight to lighten or go out.
3NCV red light: Non Contact AC Voltage (NCV) detection red light.
4NCV green light: Non Contact AC Voltage (NCV) detection green light.
5LCD display: 6000 counts digit, full function symbol display.
6SELECT key: This key work on the " " range, press the key to choose resistance,
diode or continuity test, on the current range, change to DC or AC; If press and hold SELECT
key to power on, “Auto Power Off ” function will be disabled.
7RANGE Key: Press the “RANGE” key, the meter enters manual range mode, press it more
than 2 seconds again, return to auto mode.
8REL▲Key: Press the “REL▲” key, 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. Press it
again to exit.
9Hz/Duty Key: On “ACV/ACA” or “Hz” range, press the “Hz/Duty” key, you can choose the
Frequency or Duty Cycle measurement.
10 HOLD key: Press the “HOLD” key to lock display value, and the “DH” sign will appear on the
display, press it again to exit.
11 NCV Key: Press and hold the “NCV” key, the meter enters Non Contact AC Voltage (NCV)
detection, the NCV green LED light will light up, free it to exit.
12 Rotary Switch: Use this switch to select functions and ranges.
13 μAmAT+: μAmAandTemperature “+” Input Jack
14 20A: 20AInput Jack
15 VΩHz : V/Hz/ Input Jack
16 COMT-: COM and Temperature “-” Input Jack
17 Transistor hFE test Input Jack
18 Crust of meter
19 Protective casing
3. Safety Information
3-1 The meter is designed according to IEC-1010 concerning electronic measuring instruments with
an over-voltage category 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 range 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 Range 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 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 Ⅲ1000V
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: 4000 counts digit.
5-6 Auto range & Manual range control
5-7Auto Power Off: When measurement exceeds 30 minutes without switching mode and pressing
key, the meter will switch to standby mode. Press any key to exit standby mode. When restart
the system, press and hold SELECT key to disable auto power off.
5-8 Auto LCD backlight
5-9 Fuse protection: 500mA/500V Fast Fuse, 20A/500V Fast Fuse
5-10 Power supply: 1.5V×2 “AA” R6P battery
5-11 Operating Temp.: 0℃to 40℃(relative humidity <85%)
5-12 Storage Temp.: -10℃to 50℃((relative humidity <85%)
5-13 Guaranteed precision Temp.: 23±5℃(relative humidity <70%)
5-14 Dimension: 195x88x40mm
5-15 Weight: approx. 350g (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
Range Resolution Accuracy
400mV 0.1mV
±(0.5% of rdg + 2 digits)
4V 1mV
40V 10mV
400V 100mV
1000V 1V ±(0.8% of rdg + 2 digits)
-- Impedance: 10MΩ, More than 100MΩ on 400mV range
-- Overload protection: 250V DC or AC rms for 400mV range,
effective 1000V DC or 750V AC rms for other ranges
6-2 AC Voltage
Range Resolution Accuracy
400mV 0.1mV ±(1.2% of rdg + 3 digits)
4V 1mV
±(0.8% of rdg + 3 digits)40V 10mV
400V 100mV
750V 1V ±(1.2% of rdg + 3 digits)
-- The 400mV range be selected by press “RANGE” key only
-- Impedance: 10MΩ, More than 100MΩ on 400mV range
-- Overload protection: 250V DC or AC rms for 400mV range,
effective 1000V DC or 750V AC rms for other ranges
-- Frequency Range: 40 to 400Hz
-- Response: average, calibrated in rms of sine wave
6-3 DC Current
Range Resolution
Accuracy
400μA 0.1μA
±(1.2% of rdg + 2 digits)
4000μA 1μA
40mA 10μA
400mA 100μA
4A 1mA
±(2.0% of rdg + 3 digits)
20A 10mA
-- Overload protection: 500mA/500V Fast Fuse
20A/500V Fast Fuse, 20A up to 10 seconds
6-4 AC Current
Range Resolution
Accuracy
400μA 0.1μA
±(1.5% of rdg + 3 digits)
4000μA 1μA
40mA 10μA
400mA 100μA
4A 1mA
±(2.5% of rdg + 5 digits)
20A 10mA
-- Overload protection: 500mA/500V Fast Fuse
20A/500V Fast Fuse, 20A up to 10 seconds
-- Frequency Range: 40 to 400Hz
-- Response: average, calibrated in rms of sine wave
6-5 Resistance
Range Resolution Accuracy
400Ω 0.1Ω ±(1.0% of rdg + 3 digits)
4kΩ 1Ω
±(1.0% of rdg + 2 digits)
40kΩ 10Ω
400kΩ 100Ω
4MΩ 1kΩ
40MΩ 10kΩ ±(1.5% of rdg + 3 digits)
-- Overload protection: 500V DC or AC rms
6-6 Capacitance
Range
Accuracy
Resolution
51.2nF
±(3.0% of rdg + 10 digits)
10pF
512nF
±(2.5% of rdg + 5 digits)
100pF
5.12µF 1nF
51.2µF 10nF
100µF
±(5.0% of rdg + 10 digits)
100nF
-- Overload protection: 500V DC or AC rms
6-7 Frequency
Range Accuracy Resolution
5.12Hz
± (0.1% of rdg + 5 digits)
0.001Hz
51.2Hz 0.01Hz
512Hz 0.1Hz
5.12kHz 1Hz
51.2kHz 10Hz
512kHz 100Hz
5.12MHz 1kHz

-- Sensitivity: sine wave 0.6V rms (5.12MHz: 1.5V rms)
-- Overload protection: 500V DC or AC rms
6-8 Duty cycle
0.1%～99.9%: ± ( 2.0% of rdg + 2 digits ), Frequency lower than 10kHz
-- Sensitivity: sine wave 0.6V rms
-- Overload protection: 500V DC or AC rms
6-9 Temperature
Range Accuracy Resolution
℃
-20~150℃± ( 3℃+ 1digit )
1℃
150~1000℃± ( 3% of rdg + 2digits )
-- NiCr-NiSi K-type sensor
-- Overload protection: 500mA/500V Fast Fuse
6-10 Diode and Audible continuity test
Range Description Test Condition
Display read approximately
forward voltage of diode
Forward DC current
approx. 0.4mA
Reversed DC voltage
approx. 1.5V
Built-in buzzer sounds if
resistance is less than 100Ω
Open circuit voltage
approx. 0.5V
Overload protection: 500V DC or AC rms
6-11 Transistor hFE test
Test range: 0-1000
Ib=10µA, Vce=2.4V Approx.
6-12 Non Contact AC Voltage (NCV) detection
Test voltage range: 90V～1000V AC rms
The NCV red light and green light will light up alternately together with sound.
7. OPERATING INSTRUCTIONS
7-1 Attention before operation
7-1-1 Check battery. When the battery voltage drop below proper operation range, the “ ” symbol
will appear on the LCD display and the battery need to changed.
7-1-2 Pay attention to the “ ” besides the input jack which shows that the input voltage or current
should be within the specified value.
7-1-3 The range switch should be positioned to desired range for measurement before operation.
7-2 Measuring DC Voltage
7-2-1 Set the rotary switch at the desired mV or V range position.
7-2-2 Connect the black test lead to COMT- jack and the red to VΩHz jack.
7-2-3 Connect test leads across the source or load under measurement.
7-2-4 You can get reading from LCD. The polarity of the red lead connection will be indicated along
with the voltage value.
NOTE:
1.“ ” means you can’t input the voltage more than 1000V, it’s possible to show higher voltage, but
it may destroy the inner circuit or pose a shock.
2. Be cautious against shock when measuring high Voltage.
7-3 Measuring AC Voltage
7-3-1 Set the rotary switch at the desired V range position.
7-3-2 Connect the black test lead to COMT- jack and the red to VΩHz jack.
7-3-3 Connect test leads across the source or load under measurement.
7-3-4 You can get reading from LCD.
NOTE:
1.“ ” means you can’t input the voltage more than 750V, it’s possible to show higher voltage, but it
may destroy the inner circuit or pose a shock.
2. Be cautious against shock when measuring high Voltage.
7-4 Measuring DC & AC Current
7-4-1 Set the rotary switch at the desired “uA ” & “mA ” & “A” range position, it shows
symbol for testing DC current, if you want to test AC current, push “SELECT” button switch.
7-4-2 Connect the black test lead to COMT- jack and the red to the μAmAT+ jack for a maximum
400mA current , for a maximum 4A or 20A current, move the red lead to the 20A jack.
7-4-3 Connect test leads in series with the load under measurement.
7-4-4 You can get reading from LCD. The polarity of the red lead connection will be indicated along
with the DC current value.
NOTE:
1. When the value scale to be measured is unknown beforehand, set the range selector at the
highest position.
2. When only “OL” is displayed, it indicates over-range situation and the higher range has to be
selected.
3. “ ” means the socket mA’s maximum current is 500mA and 20A’s maximum current is 20A,
over 500mA or 20A current can be protected by the fast fuse.
4. On the 20A range, the measuring time should be less than 10 seconds to prevent precision from
affecting by circuit heating.
7-5 Measuring Resistance
7-5-1 Set the rotary switch at the desired “ ” range position.
7-5-2 Connect the black test lead to COMT- jack and the red to VΩHz jack.
7-5-3 Connect test leads across the resistance under measurement.
7-5-4 You can get reading from LCD.
NOTE: Max. input overload: 500V rms＜10sec
1. For measuring resistance above 1MΩ, the mete may take a few seconds to get stable reading.
2. When the input is not connected, i.e. at open circuit, the figure ‘OL’ will be displayed for the
over-range condition.
3. When checking in-circuit resistance, be sure the circuit under test has all power removed and
that all capacitors have been discharged fully.
7-6 Measuring Capacitance
7-6-1 Set the rotary switch at the desired “ ” range position.
7-6-2 Connect the black test lead to COMT- jack and the red to VΩHz jack.
7-6-3 Connect test leads across the capacitance under measurement.
7-6-4 You can get reading from LCD.
NOTE: Max. input overload: 500V rms＜10sec
1. Capacitors should be discharged before being tested.
2. When testing large capacitance, it will take longer time before the final indication ( For 100uF
range, it will take about 15 seconds ).
3. When testing small capacitance (≤1uF), to assure the measurement accuracy, first press
"REL▲", then go on measuring.
7-7 Measuring Frequency & Duty cycle
7-7-1 Set the rotary switch at the desired “Hz” range position.
7-7-2 Connect the black test lead to COMT- jack and the red to VΩHz jack.
7-7-3 Push “Hz/Duty” key to choose Frequency or Duty cycle test.
7-7-4 Connect the probe across the source or load under measurement.
7-7-5 You can get reading from LCD.
7-8 Measuring Temperature
7-8-1 Set the rotary switch at the desired “ ” range position.
7-8-2 Connect the black banana plug of the sensor to COMT- jack and the red banana plug to the
μAmAT+ jack.
7-8-3 Put the sensor probe into the temperature field under measurement.
7-8-4 You can get reading from LCD.
NOTE:
1. The accessory of the meter WRNM-010 type contact thermocouple limit temperature is 250 ℃
(300 ℃shortly), please use special probe for test higher temperature.
2. Please don't change the thermocouple at will, otherwise we can't guarantee to measure accuracy.
3. Please don’t importing the voltage in the temperature function.
7-9 Diode & Audible continuity Testing
7-9-1 Set the rotary switch at the “ ” range position, push “SELECT” to choose Diode or
Audible continuity measurement.
7-9-2 Connect the black test lead to COMT- jack and the red to VΩHz jack.
7-9-3 On diode range, connect the test leads across the diode under measurement, display shows
the approx. forward voltage of this diode.
7-9-4 On Audible continuity range, connect the test leads to two point of circuit, if the resistance is
lower than approx. 100Ω, the buzzer sounds.
NOTE: Make sure the power is cut off and all capacitors need to be discharged under this
measurement.
7-10 Transistor hFE Test
7-10-1 Set the rotary switch at the desired “hFE” range position.
7-10-2 Determine whether the transistor is NPN or PNP and locate the Emitter, Base and Collector
leads. Insert the leads into the proper holes in the socket on the front panel.
7-10-3 You can get reading of the approximate hFE value from LCD.
NOTE: Don’t connect an external voltage to measuring terminals.
7-11 Non Contact AC Voltage detection
7-11-1 Power on the meter, on any range, press and hold the “NCV” key, the meter enters Non
Contact AC Voltage (NCV) detection, the NCV green LED light will light up.
7-11-2 Hold the Meter so that the mater’s top is vertically and horizontally centered and contacting
the conductor, when the live voltage ≥ 90V AC rms, the NCV red LED light and green LED
light will light up alternately together with sound.
NOTE:
1. Even without LED indication, the voltage may still exist. Do not rely on non-contact voltage
detector to determine the presence of voltage wire. Detection operation may be subject to socket
design, insulation thickness and different type and other factors.
2. When the meter input terminals presence voltage, due to the influence of presence voltage,
voltage sensing indicator may also be bright.
3. Keep the meter away from electrical noise sources during the tests, i.e., florescent lights,
dimmable lights, motors, etc.. These sources can trigger Non-Contact AC Voltage detection function
and invalidate the test.
8. Battery replacement
8-1 When the battery voltage drop below proper operation range the " " symbol will appear on the
LCD display and the battery need to changed.
8-2 Before changing the battery, set the selector switch to “OFF” position and remove the test leads
from the terminals. Open the cover of the battery cabinet by a screwdriver.
8-3 Replace the old battery with the same type battery (AA R6P 1.5V×2).
8-4 Close the cover of the battery cabinet and fasten the screw.
9. Fuse replacement
9-1 This meter is provided with a 500mA/500V fast fuse to protect the temperature test and the
current measuring circuits which measure up to 400mA, with a 20A/500V fuse to protect the 20A
range.
9-2 Ensure the meter is not connected to any external circuit, set the selector switch to “OFF”
position and remove the test leads from the terminals. Open the cover of the battery cabinet by a
screwdriver.
9-3 Replace the old fuse with the same type and rating: 6×30mm 500mA/500V fast fuse or 6×30mm
20A/500V fast fuse.
9-4 Close the cover of the battery cabinet and fasten the screw.
10. Maintenance
10-1 You must replace the test leads if the lead is exposed, and should adopt the leads with the
same specifications as origin.
10-2 Use only moist fabric or small amount of detergent but not chemical solution for cleaning.
10-3 Do not use the meter before the back cover is properly closed and screw secured. Upon any
abnormality, stop operation immediately and send the meter for maintenance.
10-4 Please take out the battery when not using for a long time.
11. Accessories
[1] Test Leads: electric rating 1000V 20A
[2] “K” type thermocouple sensor probe
[3] Operator’s Manual
Above picture and content just for your reference. Please be subject to the
actual products if anything different or updated. Please pardon for not
informing in advance.