HoldPeak 39B Operator's Manual

39B

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
25mm 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, temperature, battery test, positive diode voltage fall and audible
continuity.

2. Panel Layout

1. Test lead fixture: Fix the test lead.

2. Battery test green light: the green light show the battery being tested is good,
it can continue to be used.

3. Battery test yellow light: the yellow light show the battery being tested is close
to bad, it can be used but need to changed as quickly as possible.

4. Battery test red light: the red light show the battery being tested is bad, it can
not continue to be used.

5. LCD display: 3 1/2 digits LCD display, full function symbol display.

6. SELECT 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, on the range, change to °C or °F test.

7. RANGE Key: Press the “RANGE” key, the meter enters manual range mode,
press it more than 2 seconds again, return to auto mode.

8. Key: Press the “ ” key over 2 seconds to light the back light, press it
again for more than 2 seconds to lights off it, it can lights off automatically after
15 seconds too.

9. M.HOLD key: Press the “M.HOLD” key to lock MAX value, and the “M.HOLD”
sign will appear on the display, press it again to exit. If press and hold the
“M.HOLD” key to power on, “Auto Power Off ” function will be disabled.

10. D.HOLD key: Press the “D.HOLD” key to lock display value, and the
“D.HOLD” sign will appear on the display, press it again to exit.

11. Rotary Switch: Use this switch to select functions and ranges.

12. COM: COM and Temperature “-” Input Jack

13. 10A: 10A Input Jack

14. VΩmA: V/μAmA/ BATT/ / Input Jack

15. Crust of meter

16. Protective casing

3. Safety Information

3-1 The meter is designed according to IEC-1010 concerning electronic
measuring instruments with an over-voltage category 600V (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 avoid 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 Ⅲ 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 Display: 3 1/2 digit LCD with a max. reading of 1999.
5-6 Auto range control
5-7 Auto Power Off: When measurement exceeds 15 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 M.HOLD
key to disable auto power off.

5-8 Fuse protection: 500mA/500V Fast Fuse, 10A/500V Fast Fuse
5-9

Power supply: 9V 6F22 battery
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: 150x100x36mm
5-14 Weight: approx. 250g (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

200mV

0.1mV

±(0.5% of rdg + 2 digits)

2V

1mV

20V

10mV

200V

100mV

600V

1V

±(0.8% of rdg + 2 digits)

-- Impedance: 10MΩ, More than 100MΩ on 200mV range

-- Overload protection: 600V DC or AC rms

6-2 AC Voltage

Range

Resolution

Accuracy

2V

1mV

±(0.8% of rdg + 3 digits)

20V

10mV

200V

100mV

600V

1V

±(1.2% of rdg + 3 digits)

-- Impedance: 10MΩ

-- Overload protection: 600V DC or AC rms

-- Frequency Range: 40 to 400Hz

-- Response: average, calibrated in rms of sine wave

6-3 DC Current

Range

Resolution

Accuracy

200μA

0.1μA

±(1.2% of rdg + 2 digits)

2000μA

1μA

20mA

10μA

200mA

100μA

2A

1mA

±(2.0% of rdg + 3 digits)

10A

10mA

-- Overload protection: 500mA/500V Fast Fuse

10A/500V Fast Fuse, 10A up to 10 seconds

6-4 AC Current

Range

Resolution

Accuracy

200μA

0.1μA

±(1.5% of rdg + 3 digits)

2000μA

1μA

20mA

10μA

200mA

100μA

2A

1mA

±(2.5% of rdg + 5 digits)

10A

10mA

-- Overload protection: 500mA/500V Fast Fuse

10A/500V Fast Fuse, 10A up to 10 seconds

-- Frequency Range: 40 to 400Hz

-- Response: average, calibrated in rms of sine wave

6-5 Resistance

Range Resolution Accuracy

200Ω 0.1Ω ±(1.0% of rdg + 3 digits)

2kΩ 1Ω

±(1.0% of rdg + 2 digits)

20kΩ 10Ω

200kΩ 100Ω

2MΩ 1kΩ

20MΩ 10kΩ ±(1.5% of rdg + 3 digits)

-- Overload protection: 500V DC or AC rms
6-6 Temperature

Range Accuracy

Resolution

℃

-20~150℃ ± ( 3℃+ 1digit )
1℃

150~1000℃ ± ( 3% of rdg + 2digits )

℉

-4~302℉ ± ( 5℉+ 2digits )
1℉

302~1832℉ ± ( 3% of rdg + 3digits )

-- NiCr-NiSi K-type sensor

-- Overload protection: 500mA/500V Fast Fuse

6-7 Battery test

Range Accuracy Load current Resolution

1.5V

±(5.0% of rdg + 5 digits)

Approx. 10mA 1mV
6V Approx. 100mA 10mV
9V Approx. 10mA 10mV
12V Approx. 200mA 10mV

-- Overload protection: 500mA/500V Fast Fuse

LED light

Range Green LED Yellow LED Red LED

1.5V

1.30V ± 0.08V
and up.

0.94V ± 0.08V to

1.29V ± 0.08V

0.15V ± 0.08V to

0.93V ± 0.08V

6V

5.22V ± 0.3V
and up.

3.76V ± 0.3V to

5.21V ± 0.3V

0.6V ± 0.3V to

3.75V ± 0.3V

9V

7.83V ± 0.45V
and up.

5.64V ± 0.45V to

7.82V ± 0.45V

0.9V ± 0.45V to

5.63V ± 0.45V

12V

10.44V ± 0.6V
and up.

7.52V ± 0.6V to

10.43V ± 0.6V

1.2V ± 0.6V to

7.51V ± 0.6V

-- When the voltage of the battery being tested is lower than 10% of its
rated voltage, the red LED will not light.

-- When the battery connect to the meter is reverse, the meter will appear
negative on the LCD display, but the LED will not light.

6-8 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

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 VΩmA 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.
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 600V, 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 VΩmA jack for
a maximum 200mA current , for a maximum 2A or 10A current, move the red
lead to the 10A 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 500mA and 10A’s maximum
current is 10A, over 500mA or 10A current can be protected by the fast fuse.

4. On the 10A 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 VΩmA 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: 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.

7-5 Battery Testing

7-5-1 Connect the black test lead to COM jack and the red to VΩmA jack.
7-5-2 Set the rotary switch at the desired BATT “1.5V”, “6V”, “9V” or “12V” range

position to test 1.5V, 6V, 9V or 12V battery.

7-5-3 Connect the red test lead to the positive of the battery and the black test

lead to the negative of the battery.

7-5-4 You can get reading from LCD and the corresponding LED will light.

NOTE:

1. the green LED light show the battery being tested is good, it can continue to
be used; the yellow LED light show the battery being tested is close to bad, it
can be used but need to changed as quickly as possible; the red LED light
show the battery being tested is bad, it can not continue to be used.

2. When the battery connect to the meter is reverse, the meter will appear
negative on the LCD display, but the LED will not light.

7-6 Diode & Audible continuity Testing

7-6-1 Connect the black test lead to COM jack and the red to VΩmA jack.
7-6-2 Set the rotary switch at the “ ” range position, push “SELECT” to

choose Diode or Audible continuity measurement.

7-6-3 On diode range, connect the test leads across the diode under

measurement, display shows the approx. forward voltage of this diode.

7-6-4 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.

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 (9V 6F22).
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 battery

test, temperature test and the current measuring circuits which measure up to

200mA, with a 10A/500V fuse to protect the 10A 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 10A/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 10A
[2] Operator’s Manual