HoldPeak 90EPD User manual

HOLDPEAK
90EPD
OPERATOR’S MANUAL
1. Overview
The intelligent digital 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 meter can be connected with mobile phone by Bluetooth, and display on phone
by APP, you can remote monitoring the measurement condition, the distance control
is 10～15m.
The meter can be used to measure DC & AC voltage, DC & AC current, resistance,
capacitor, frequency, duty cycle, temperature, battery test, positive diode voltage fall
and audible continuity.
2. Panel Layout
①LCD display: 4000 counts digit, full function symbol display.
②SELECT key: This key work on the " " range, press the key
to choose resistance, diode or continuity test, on the voltage or
current range, change to DC or AC.
③HOLD key: Press the “HOLD” key to lock display value, and the “DH”sign will
appear on the display, press it again to exit.
④RANGE Key: Press the “RANGE” key, the meter enters manual range mode,
press it more than 2 seconds again, return to auto mode.
⑤REL 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.
⑥Hz/% Key: On “ACV/ACA” or “Hz” range, press the “Hz/%”key, you can
choose the Frequency or Duty Cycle measurement.
⑦CDS sensor: The CDS sensor can reaction to the ambient brightness
range, then automatically control the LCD backlight to lighten or go out.
⑧Rotary Switch: use this switch to select functions and ranges.
⑨VHz Input Jack
⑩COM and Temperature “-” Input Jack
⑪μAmA/BATT and Temperature “+” Input Jack
⑫20A Input Jack
3. Safety Information
3-1 The meters are designed according to IEC-1010 concerning electronic
measuring instrument with an over-voltage category 600V(CAT Ⅳ) 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 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 Ⅳ600V
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
5-7 Auto LCD backlight
5-8 Fuse protection: 400mA/250V PPTC Resettable Fuse
F-20A/250V Fuse (Ø5x20mm)
5-9 Power supply: 9V battery (6F22)
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: 166x88x51mm
5-14 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
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: 400mA/250V PPTC Resettable Fuse
F-20A/250V 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: 400mA/250V PPTC Resettable Fuse
F-20A/250V 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: 250V 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: 250V DC or AC rms

HOLDPEAK
90EPD
OPERATOR’S MANUAL
1. Overview
The intelligent digital 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 meter can be connected with mobile phone by Bluetooth, and display on phone
by APP, you can remote monitoring the measurement condition, the distance control
is 10～15m.
The meter can be used to measure DC & AC voltage, DC & AC current, resistance,
capacitor, frequency, duty cycle, temperature, battery test, positive diode voltage fall
and audible continuity.
2. Panel Layout
①LCD display: 4000 counts digit, full function symbol display.
②SELECT key: This key work on the " " range, press the key
to choose resistance, diode or continuity test, on the voltage or
current range, change to DC or AC.
③HOLD key: Press the “HOLD” key to lock display value, and the “DH”sign will
appear on the display, press it again to exit.
④RANGE Key: Press the “RANGE” key, the meter enters manual range mode,
press it more than 2 seconds again, return to auto mode.
⑤REL 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.
⑥Hz/% Key: On “ACV/ACA” or “Hz” range, press the “Hz/%”key, you can
choose the Frequency or Duty Cycle measurement.
⑦CDS sensor: The CDS sensor can reaction to the ambient brightness
range, then automatically control the LCD backlight to lighten or go out.
⑧Rotary Switch: use this switch to select functions and ranges.
⑨VHz Input Jack
⑩COM and Temperature “-” Input Jack
⑪μAmA/BATT and Temperature “+” Input Jack
⑫20A Input Jack
3. Safety Information
3-1 The meters are designed according to IEC-1010 concerning electronic
measuring instrument with an over-voltage category 600V(CAT Ⅳ) 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 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 Ⅳ600V
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
5-7 Auto LCD backlight
5-8 Fuse protection: 400mA/250V PPTC Resettable Fuse
F-20A/250V Fuse (Ø5x20mm)
5-9 Power supply: 9V battery (6F22)
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: 166x88x51mm
5-14 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
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: 400mA/250V PPTC Resettable Fuse
F-20A/250V 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: 400mA/250V PPTC Resettable Fuse
F-20A/250V 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: 250V 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: 250V 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: 250V 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: 250V DC or AC rms
6-9 Temperature
Range Accuracy Resolution
℃-20~150℃± ( 3℃+ 1digit ) 1℃
150~1000℃± ( 3% of rdg + 2digits )
-- NiCr-NiSi sensor
-- Overload protection: 400mA/250V PPTC Resettable Fuse
6-10 Battery test
Range Accuracy Test Condition
±(5.0% of rdg + 5 digits) Loading Current:
Approx. 25mA
-- Battery voltage range: 1.5V~12V
-- Overload protection: 400mA/250V PPTC Resettable Fuse
6-11 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: 250V DC or AC rms
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 & AC Voltage
7-2-1 Connect the black test lead to COM jack and the red to VΩHz jack.
7-2-2 Set the rotary switch at the desired “V”range position, it shows symbol for
testing DC voltage, if you want to test AC voltage, push “SELECT” button switch,
then if you want to test AC 400mV, push “RANGE”to choose.
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 DC 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 DC & AC Current
7-3-1 Connect the black test lead to COM jack and the red to the μAmA jack for a
maximum 400mA current , for a maximum 2A or 20A current, move the red lead to
the 20A jack.
7-3-2 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.
7-3-3 Connect test leads in series with the load under measurement.
7-3-4 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 400mA and 20A’s maximum
current is 20A, over 400mA current can be protected by the PPTC resettable fuse,
but over 20A current will destroy the fuse. On the 20A range, the measuring time
should be less than 10 seconds to prevent precision from affecting by circuit
heating.
7-4 Measuring Resistance
7-4-1 Connect the black test lead to COM jack and the red to VΩHz jack.
7-4-2 Set the rotary switch at the desired “”range position.
7-4-3 Connect test leads across the resistance under measurement.
7-4-4 You can get reading from LCD.
NOTE:
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.
7-5 Measuring Capacitance
7-5-1 Connect the black test lead to COM jack and the red to VΩHz jack.
7-5-2 Set the rotary switch at the desired “”range position.
7-5-3 Connect test leads across the capacitance under measurement.
7-5-4 You can get reading from LCD.
NOTE: Max. input overload: 250V 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, it will take about approx. 15 seconds).
3. When testing small capacitance (≤100nF), to assure the measurement accuracy,
first press "REL", then go on measuring.
7-6 Measuring Frequency & Duty cycle
7-6-1 Connect the black test lead to COM jack and the red to VΩHz jack.
7-6-2 Set the rotary switch at the desired “Hz”range position.
7-6-3 Push “Hz/%” key to choose Frequency or Duty cycle test.
7-6-4 Connect the probe across the source or load under measurement.
7-6-5 You can get reading from LCD.
7-7 Measuring Temperature
7-7-1 Connect the black banana plug of the sensor to COM (T-) jack and the red
banana plug to the μAmA (T+) jack.
7-7-2 Set the rotary switch at the desired “”range position.
7-7-3 Put the sensor probe into the temperature field under measurement.
7-7-4 You can get reading from LCD.
NOTE: Max. input over-load: 250V rms＜10sec
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.
7-8 Battery Testing
7-8-1 Connect the black test lead to COM jack and the red to μAmA jack.
7-8-2 Set the rotary switch at the desired “ ” range position.
7-8-3 Connect test leads across the source or load under measurement.
7-8-4 You can get reading from LCD. The loading current: is approx. 25mA (positive), it
is no loading current when the display is negative.
7-9 Diode & Audible continuity Testing
7-9-1 Connect the black test lead to COM jack and the red to VΩHz jack.
7-9-2 Set the rotary switch at the “”range position, push “SELECT”to
choose Diode or Audible continuity measurement.
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 Connect to mobile phone APP
The meter has serial data output function. It can be connected with mobile phone
by Bluetooth, so the measured data can be recorded, analyzed, and processed by
mobile phone APP. Before use this function, you need install the mobile phone APP
by scan the QR code.
NOTE: The mobile phone APP can be installed in iphone 4S iOS or android
4.30 system and up.
7-10-1 Make sure the “HP-90EPD”mobile phone APP successfully installed before
any measurement.
7-10-2 Open the Bluetooth of the mobile phone, Run the “HP-90EPD”mobile
phone APP to enter the main interface.
7-10-3 Turn on the meter, the meter will connect to mobile phone automatically,
when the “Start”key change to green, click the “Start”key to measure and view the
synchronic data or graph in the mobile phone APP.
7-10-4 The MAX or MIN value and corresponding time will display on the mobile
phone APP, and the average value in a period of time from start measurement will
display too.
7-10-5 Press the “Reset”key to reset measurement, the old data will be cleared
and resume data recording. Press the “Stop”key to stop connection.
7-10-6 Press the “Data”key to view the data and time, Press the “Graph”key to
view the graph, Press the “Save”key to save the data or the graph. Press the
“Home”key to return the main interface.
7-10-7 More information about the mobile phone APP, please refer to the Help topic
including in the APP.
8. Maintenance
8-1 Before attempting to remove the battery door or open the case, be sure that test
leads have been disconnected from measurement circuit top avoid electric shock
hazard.
8-2 To avoid electrical shock, remove test leads from measurement circuits before
replacing the fuse. For protection against fire, replace fuses only with specified
ratings: F-20A/250V fuse.
8-3 Your must replace the test leads if the lead is exposed, and should adopt the
leads with the same specifications as origin.
8-4 Use only moist fabric or small amount of detergent but not chemical solution for
cleaning.
8-5 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.
8-6 Please take out the battery when not using for a long time.

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: 250V 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: 250V DC or AC rms
6-9 Temperature
Range Accuracy Resolution
℃-20~150℃± ( 3℃+ 1digit ) 1℃
150~1000℃± ( 3% of rdg + 2digits )
-- NiCr-NiSi sensor
-- Overload protection: 400mA/250V PPTC Resettable Fuse
6-10 Battery test
Range Accuracy Test Condition
±(5.0% of rdg + 5 digits) Loading Current:
Approx. 25mA
-- Battery voltage range: 1.5V~12V
-- Overload protection: 400mA/250V PPTC Resettable Fuse
6-11 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: 250V DC or AC rms
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 & AC Voltage
7-2-1 Connect the black test lead to COM jack and the red to VΩHz jack.
7-2-2 Set the rotary switch at the desired “V”range position, it shows symbol for
testing DC voltage, if you want to test AC voltage, push “SELECT” button switch,
then if you want to test AC 400mV, push “RANGE”to choose.
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 DC 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 DC & AC Current
7-3-1 Connect the black test lead to COM jack and the red to the μAmA jack for a
maximum 400mA current , for a maximum 2A or 20A current, move the red lead to
the 20A jack.
7-3-2 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.
7-3-3 Connect test leads in series with the load under measurement.
7-3-4 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 400mA and 20A’s maximum
current is 20A, over 400mA current can be protected by the PPTC resettable fuse,
but over 20A current will destroy the fuse. On the 20A range, the measuring time
should be less than 10 seconds to prevent precision from affecting by circuit
heating.
7-4 Measuring Resistance
7-4-1 Connect the black test lead to COM jack and the red to VΩHz jack.
7-4-2 Set the rotary switch at the desired “”range position.
7-4-3 Connect test leads across the resistance under measurement.
7-4-4 You can get reading from LCD.
NOTE:
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.
7-5 Measuring Capacitance
7-5-1 Connect the black test lead to COM jack and the red to VΩHz jack.
7-5-2 Set the rotary switch at the desired “”range position.
7-5-3 Connect test leads across the capacitance under measurement.
7-5-4 You can get reading from LCD.
NOTE: Max. input overload: 250V 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, it will take about approx. 15 seconds).
3. When testing small capacitance (≤100nF), to assure the measurement accuracy,
first press "REL", then go on measuring.
7-6 Measuring Frequency & Duty cycle
7-6-1 Connect the black test lead to COM jack and the red to VΩHz jack.
7-6-2 Set the rotary switch at the desired “Hz”range position.
7-6-3 Push “Hz/%” key to choose Frequency or Duty cycle test.
7-6-4 Connect the probe across the source or load under measurement.
7-6-5 You can get reading from LCD.
7-7 Measuring Temperature
7-7-1 Connect the black banana plug of the sensor to COM (T-) jack and the red
banana plug to the μAmA (T+) jack.
7-7-2 Set the rotary switch at the desired “”range position.
7-7-3 Put the sensor probe into the temperature field under measurement.
7-7-4 You can get reading from LCD.
NOTE: Max. input over-load: 250V rms＜10sec
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.
7-8 Battery Testing
7-8-1 Connect the black test lead to COM jack and the red to μAmA jack.
7-8-2 Set the rotary switch at the desired “ ” range position.
7-8-3 Connect test leads across the source or load under measurement.
7-8-4 You can get reading from LCD. The loading current: is approx. 25mA (positive), it
is no loading current when the display is negative.
7-9 Diode & Audible continuity Testing
7-9-1 Connect the black test lead to COM jack and the red to VΩHz jack.
7-9-2 Set the rotary switch at the “”range position, push “SELECT”to
choose Diode or Audible continuity measurement.
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 Connect to mobile phone APP
The meter has serial data output function. It can be connected with mobile phone
by Bluetooth, so the measured data can be recorded, analyzed, and processed by
mobile phone APP. Before use this function, you need install the mobile phone APP
by scan the QR code.
NOTE: The mobile phone APP can be installed in iphone 4S iOS or android
4.30 system and up.
7-10-1 Make sure the “HP-90EPD”mobile phone APP successfully installed before
any measurement.
7-10-2 Open the Bluetooth of the mobile phone, Run the “HP-90EPD”mobile
phone APP to enter the main interface.
7-10-3 Turn on the meter, the meter will connect to mobile phone automatically,
when the “Start”key change to green, click the “Start”key to measure and view the
synchronic data or graph in the mobile phone APP.
7-10-4 The MAX or MIN value and corresponding time will display on the mobile
phone APP, and the average value in a period of time from start measurement will
display too.
7-10-5 Press the “Reset”key to reset measurement, the old data will be cleared
and resume data recording. Press the “Stop”key to stop connection.
7-10-6 Press the “Data”key to view the data and time, Press the “Graph”key to
view the graph, Press the “Save”key to save the data or the graph. Press the
“Home”key to return the main interface.
7-10-7 More information about the mobile phone APP, please refer to the Help topic
including in the APP.
8. Maintenance
8-1 Before attempting to remove the battery door or open the case, be sure that test
leads have been disconnected from measurement circuit top avoid electric shock
hazard.
8-2 To avoid electrical shock, remove test leads from measurement circuits before
replacing the fuse. For protection against fire, replace fuses only with specified
ratings: F-20A/250V fuse.
8-3 Your must replace the test leads if the lead is exposed, and should adopt the
leads with the same specifications as origin.
8-4 Use only moist fabric or small amount of detergent but not chemical solution for
cleaning.
8-5 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.
8-6 Please take out the battery when not using for a long time.