UNI DM-1170A User manual

80000 Counts
Bench Digital Meter DM-1170A
Operation Manual V1.1
BENCHTOP INSTRUMENT

CONTENTS
1. GENERAL INTRODUCTION ........................................................................................................... - 1 -
2. PANEL INSTRUCTIONS ................................................................................................................. - 2 -
3. SPECIAL FUNCTIONS ................................................................................................................... - 6 -
4. MEASUREMENT RANGE............................................................................................................... - 8 -
5. OPERATION INSTRUCTIONS........................................................................................................ - 9 -
6. PROGRAMMABLE CONTROL ..................................................................................................... - 15 -
7. SPECIFICATIONS......................................................................................................................... - 18 -
8. MAINTENANCE ............................................................................................................................ - 21 -
SAFETY INSTRUCTIONS
Highvoltage GND Dualinsulation Refertomanual.
WARNING!
To avoid the electric shock and physical injury, and to avoid possible damage to the meter and the tested
equipments, read this operation manual carefully before using this meter, and follow the following safety
guidelines:
Before use, check and make sure that the instrument’s chassis, the test leads and the insulation layer are
intact.
Use the meter only as specified in this manual. Otherwise, the protection provided by the meter may be
expired.
Never measure voltage while the test leads are plugged into the current input terminals.
Do not input voltage higher than rated voltage between terminals or between terminal and earth (refer
rated voltage to the nearby symbols of ).
Do not use the meter if it looks damaged
Inspect the leads for damaged insulation or exposed metal, check test lead continuity. Replace damaged
leads.
Disconnect the power and discharge all high-voltage capacitors before measurement in resistance,
continuity and diode function.
Be cautious when working at voltage above DC60V or AC42V. Such voltages may cause a shock hazard.
When undertaking measurement, keep your fingers behind the guard’s plant on the test leads or probes.
Select the proper function and measurement range for measurement to avoid damage to the meter.
Disconnect the test leads from the test points before changing to another function.

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1. GENERAL INTRODUCTION
DM-1170A is an intelligent and multi-functional device for various measurements. It features high quality, high
accuracy, high reliability, high frequency measurement and low cost. The meter is in compliance with IEC 6010
CAT II 1000V and CAT III 600V high voltage standards. Other features of this instrument are listed below.
Multi-display: primary 80000 counts, secondary 80000 counts, bar graph 21 segments
50 measuring functions, including basic DCV, ACV, DCA, ACA, Ω, CAP, Hz, TEMP, Diode and
Continuity, etc.
Square waveform output with16 sets of frequency, up to 5kHz, 1%~99% duty cycle
Simultaneous measurements of (AC+DC), (AC+Hz), (DC+dBm), (dBm+Hz), (Hz+Duty), (℃+℉)
Auto data update and refresh, auto data hold, auto peak hold
36 hours dynamic records: MAG, MIN, AVG, MAX-MIN, (REL▲), (REL%)
Measurement with upper/lower limit setting
Timing measurement function
AC measuring adopts highly accurate true RMS measurement, with measurement frequency bandwidth
and AC+DC measuring, capable of accurate true RMS measuring of any waveforms in AC range
RS232 interface for PC remote control
For International Electrical symbols and related symbols used in the meter and operation manual, please refer
to illustrations as below.
AC GND
DC Fuse
AC or DC Square waveform
Low battery Capacitor
Diode Beeper
Double insulation CAUTION! WARNING!
RS232 Communication interface Danger! High Voltage
European standards for
electroma
g
netic compatibilit
y
IEC61010CAT International Electrotechnical
Commission over volta
g
e level
For product improvement, the specifications are subject to change without prior notice.
We hereby will not be responsible for the accident and damage caused by improper operation.
The function stated for this Operation Manual cannot be the reason of special usage.

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2. PANEL INSTRUCTIONS
Fig.2-1 Front panel
1. Power switch 2. Auxiliar
y
ke
y
s3.Terminals
4. Function ke
y
s 5. LCD displa
y
Fig. 2-2 Rear Panel
6. AC110V/220V selector switch 7. Fuse locator
8. Power socket 9. RS232 interface
(
USB adaptor provided
)

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2.1 Power Switch
It turns on or off the meter.
2.2. Auxiliary Keys
Ke
y
Description
SELECT Selects measurement mode.
When using the meter to output square waveform, press SELECT key to change duty
c
y
cle b
y
1%.
RANGE Selects measurement range. The meter is default at auto range mode.
Press this key for at least 2 seconds, the meter returns to auto range.
SET Press this key to set upper limit value, lower limit value and Ref value.
When the SET key is engaged, the RANGE key is used as a moving up key (▲), the
2nd VIEW key as a moving down key (▼), the MAX/MIN as a moving left key (◄),
and REL key as a moving right key (►).
In this case, the RANGE, 2nd VIEW, MAX/MIN and REL keys’ original functions are
disabled. ◄▲▼► keys can be used to enter and adjust the setting values.
MAX/MIN Press this key to enter the dynamic record mode, with maximum record period of 36
hours.
In the dynamic record mode, the meter automatically records the maximum value
(MAX), minimum value (MIN), difference value (MAX-MIN) and calculates the average
value (AVG) of all readings. Press this key to cycle values of MAX, MIN, MAX-MIN,
AVG on the secondary display.

TIMER /
RS232
TIMER
TIMER function is enabled when measurements can be set with REL and MAX/MIN
measuring modes.
Press TIMER key to start the secondary display for counting time. Press TIMER key
again to turn off the counting time display.
When the secondary display is displaying counting time, press key SELECT to enter
Beeper setup for setting up a timer for beeper. Then, press key RANGE (▲), MIX/MIN
(◄), REL (►), 2nd VIEW (▼) to input the time. Next press key TIMER to validate the
new time data. When the counting time exceeds the pre-set time, the beeper sounds.
In the above two modes, press key HOLD to exit timer function and turn off secondary
display, but the preset time remains unchanged.
The time is displayed in the format of “0.00.00” on the secondary display. The max.
counting time is 9h:59m:59s
RS232
Press this key for at least 2 seconds, the RS232 remote control is enabled for PC
control and communication with other instruments. The LCD displays “RS232’
Auto power off function is disabled in RS232 programmable mode.
Press this key for at least 2 seconds again to exit remote control mode and return to
local operation.
HOLD Press this key, the meter enters auto data hold mode and “A-H” is displayed on the
LCD. The data hold mode allows users to hold the displayed value while the analog
bar graph shows the current reading.
In data hold mode, press this key to circle Peak+ hold mode (PH+) and Peak- hold
mode (PH-).
Press this key for at least 2 seconds, the meter exits HOLD mode and return to normal
mode.

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2nd VIEW Selects the secondary display function. In various measuring mode, press 2nd VIEW
key to cycle the displayed data on secondary display.
In square waveform output mode, press 2nd VIEW key to select output frequency
In square waveform output mode, press 2nd VIEW key for at least 2 seconds to
return to 606.10Hz, 50% dut
y
output state.
REL Press this key, the meter enters relative measuring mode and “REL▲” appears on the
LCD display. The relative measuring function measures the difference between the
measurement value and the reference value.
The current reading is used as relative value (Ref) and shown on the secondary
display. Press REL key again, Ref value will be updated by using current reading.
The relative measurement is displayed on primary display in two modes: REL▲or
REL%. Press SELECT key to select “REL▲” or “REL%” mode.
REL▲= measuring value – Reference value
REL% = (REL▲/REL)x100%
“OL” will appear on LCD in the following situation:
When in REL▲mode, the REL▲exceeds measurement range.
When in REL% mode, the REL% exceeds 200% of the REL% value.
When in REL% mode, Ref value is set as 0.
Press REL key for at least 2 seconds to exits reference mode and return to normal
mode.
2.3 Terminals
Terminal Description
COM Common terminal to all measurements
mA Current input terminal for measurement between 0.001mA~800.00mA
20A Current input terminal for measurement between 0.0001A~20.000A
VΩHz
Input terminal for voltage, resistance, continuity, diode, capacitor, frequency,
temperature and duty cycle
Output terminal for square waveform
2.4. Function Keys
Key Description Key Description
V DC voltage OHM Resistance
V AC voltage Diode
mV AC/DC voltage mV TEMP Temperature
mA AC/DC current mA Capacitance
20A AC/DC current 20A Hz/DUTY Frequency/Duty circle
Backlit OUT Square waveform output

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2.5. LCD Display
No. Symbol Description
1 Analog bar graph
2, 3, 17 Negative sign
4 OUT Square waveform output
5 Hi
High frequency measurement
High resistance measurement
Temperature measurement by thermocouple
6 Low battery indication
7 Diode / Audible continuity measurement
8 REL▲% Relative measurement
9, 19 DC, AC, AC+DC DC, AC, AC+DC voltage or current
10 PH+ PH- Positive Peak Hold, Negative Peak Hold
11 A-H Auto Data Hold
12 AVG Average recorded data
13 AUTO Auto range mode
14 APO Auto power off mode
15 RS232 Communication interface
16 MAX/MIN/MAX-MIN MAX Rereading / MIN Reading / MAX-MIN Reading
18, 27 ℉℃ Temperature units and measurement indicator
20 mV/V/mA/A Voltage and current units on secondary display
21 Hz/kHz/MHz/Ω/kΩ/MΩFrequency and resistance units on secondary display
22 %/ %/ ms/ %ms Duty cycle unit and pulse width unit
23 nF/μF Capacitance unit
24 mV/V/mA/A Voltage and current units on primary display
25 dBm dBm annunciation
26 Hz/kHz/MHz/Ω/kΩ/MΩFrequency and resistance units on primary display
28 RPM Round per minute
29 OL Over load symbol, appears when then input value exceeds the rated
value of selected measurement range

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3. SPECIAL FUNCTIONS
3.1 Auto Power Off
When the meter exits RS232 remote control operation mode, the auto power off function is automatically
activated. “APO” appears on the LCD. If there is no operation on any of the keys within 30 minutes, the meter
will be automatically powered off. Five minutes before auto power off, the audible beepers give indication that
the meter is going to be powered off.
When the meter enters RS232 remote control operation mode or dynamic recording mode (MAX/MIN), the
auto power off function is automatically deactivated. When in the above modes, please press POWER switch
to turn off the meter.
3.2 Setting Measurement Upper and Lower Limits
The meter can be set with upper limit (HI) or lower limit (LO), or set upper limit and lower limit (HI-LO) at the
same time.
Set the upper limit (HI) / lower limit (LO):
1) Power on the meter.
2) Press function key to select measurement function.
3) Press RANGE key to select suitable measurement range.
4) Press SET key to enter setting mode.
5) Press SELECT key to select the upper/lower limit setting.
Upper limit setting: “ ” appears on secondary display.
Lower limit setting: “ ” appears on secondary display.
6) Press ◄▲▼► keys to adjust the upper limit value.
7) Press SET key to validate the new input.
Set upper limit and lower limit (HI-LO) at the same time:
1) Power on the meter
2) Press function key to select measurement function.
3) Press RANGE key to select suitable measurement range.
4) Press SET key to enter setting mode.
“ ” appears on secondary display.
5) Press ◄▲▼► keys to adjust the upper limit value.
6) Press SET key to validate the upper limit input.
7) Press SET key to enter setting mode. Then press SELECT key to select the lower setting mode.
“ ” appears on secondary display.
8) Press ◄▲▼► keys to adjust the lower limit value.
Press SET key to validate the lower limit input.
NOTE: Default measurement function is DCV. To enable the upper/lower limits setting in DCV range, another
function must be selected first, then select DCV again.
After setting up the upper and lower limits, measurement can be carried out. The measuring value is displayed
on the primary display, while secondary display will have 3 kinds of displays according to different results:
1) If the measuring value exceeds the upper limit, “ ” appears on the secondary display.
2) If the measuring value exceeds the lower limit, “ ” appears on the secondary display.
3) If the measuring value is between and upper and lower limit, “ ” appears on the secondary display.

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3.3 Setting Measurement Time
Measurement time can be set in all measurement functions except of Diode, Frequency, Temperature and
Square waveform output. Measurement time is displayed on secondary display in the format of “0.00.00”. The
maximum measurement time is 9h.59m.59s.
Follow below steps to set up measurement time:
1) Select a suitable measurement range.
2) Press TIMER key to enter the measurement time setup mode. The secondary display displays “0.00.00”
3) Press SELECT key and the last digit of “0.00.00” on the secondary display glitters, which means this digit
can be adjusted. Use the ◄▲▼► keys to adjust measurement time.
4) Press TIMER key to validate the new setup, and the measurement time is started to calculate immediately.
5) Press TIMER key again to display calculating time on secondary display.
6) When it reaches the measurement time, an indication given by continuous beepers reminds that time is up.
When calculating time is displayed, press SELECT key to switch display of measurement time and calculating
time on secondary display. Measurement time can be adjusted at any point. After measurement time is
adjusted, press TIMER key to validate the new setup. If new enter measurement time is less than calculated
time, indication will be given by continuous beepers immediately.
To stop the beepers, please press HOLD key when calculating time is displayed.
When the timer is activated, the preset measurement time and calculating time are not changed when
measurement functions and operations are changed. Press HOLD key when calculating time is displayed, the
timing function will be stopped and calculating time will be removed. To remove the preset measurement time,
press POWER switch to restart the meter.
3.4 Analog Bar Graph
The function of analog bar graph is imitating the analog needle of the meter but without the overshoot. The bar
graph refreshes data 40 times per second. Because the graph responds 10 times faster than the digital display,
it is widely used in the application of peak value test and zero calibration. It is also commonly used in observing
the rapid variation of input signals.
The bar graph has 21 segments. The number of lit segments is relative to the full-scale value of the selected
range. One unit of the bar graph represents 4000 counts/bar except when in the relative mode. The polarity is
indicated at the left of the bar graph (Positive polarity “+” is not displayed).
3.5 Square Waveform Output
The square waveform output is a very useful function. With adjustable square wave frequency and duty cycle,
users can carry out the pulse wave modulation (PWM) output, and adjust the voltage control, timer control and
clock syntherization.

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4. MEASUREMENT RANGE
A measurement range determines the measuring limits. The meter has several measurement ranges.
1) Select a proper measurement range:
If the selected measurement range is too small (the measurement signal exceeds the measurement range),
the meter will display “OL” on the LCD.
If the selected measurement range is t0o large, the measurement results may have a relatively low
resolution.
2) Auto range and Manual range
The meter has both auto range and manual range for the measurements.
In the AUTO measuring mode, “AUTO” appears on the display. The meter will automatically select a
most suitable range for the measurement signal.
In the MANUAL measuring mode, the measuring range is selected manually by pressing RANGE
key.
If there is more than one range in a measuring function, the meter will default in AUTO range.
3) Enter or exit manual range mode
Press RANGE key to select manual range mode. Then, every press on the RANGE key, the meter
steps to a higher range and will return to the lowest range when the higher range is stepped into.
This allows users to override the auto range and lock the meter in a specific range.
In HOLD or MAX/MIN recording mode, changing the measurement range manually will automatically
exit the HOLD or MAX/MIN mode.
Press RANGE key for at least 2 seconds, the meter returns to AUTO range mode.

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5. OPERATION INSTRUCTIONS
5.1 AC/DC Voltage Measurement
5.1.1 DC Voltage Measurement (DCV)
WARNING: The measurement DC voltage must not exceed DC1000V!
The measurement of DC voltage has three modes: DCV, (AC+DC)V+Hz and dBm+Hz.
1) Press function key V.
2) Press SELECT key to select measurement mode.
3) According to practical demands, press REL, MAX/MIN and 2nd VIEW keys to have relative measuring or
record.
4) Connect the black test lead to “COM” terminal and the red test lead to “VΩHz” terminal.
5) The meter is default in auto range mode and will automatically select a most suitable range. To select a
range manually for DCV measurement, press RANGE key to select a proper range. There are four
ranges to choose from: 8.0000V/80.000V/800.00V/1000.0V
6) Touch the test leads to the test points and read the display on both the primary and secondary display.
Press SELECT Primary display Secondary display
(
Press 2nd VIEW
)
Analog bar, MAX/MIN/AVG,
REL, HOLD functions
DCV DCV Available
(AC+DC)V+Hz (AC+DC)V Hz/ACV Disable
dBm+Hz dBm Hz/ACV/DCV/(AC+DC)V Disable
5.1.2 AC Voltage Measurement (ACV)
WARNING: The measurement AC voltage must not exceed AC750V!
The measurement of AC voltage has three modes: ACV, ACV+Hz and dBm+Hz.
1) Press function key V.
2) Press SELECT key to select measurement mode.
3) According to practical demands, press REL, MAX/MIN and 2nd VIEW keys to have relative measuring or
record.
4) The meter is default in auto range mode and will automatically select a most suitable range. To select a
range manually for ACV measurement, press RANGE key to select a proper range. There are three
ranges to choose from: 8.0000V/80.000V/750.00V
5) Connect the black test lead to “COM” terminal and the red test lead to “VΩHz” terminal.
6) Touch the test leads to the test points and read the display on both the primary and secondary display.
Press SELECT Primary display Secondary display
(
Press 2nd VIEW
)
Analog bar, MAX/MIN/AVG,
REL, HOLD functions
ACV ACV Available
ACV+Hz ACV Hz/ %/ %/ ms/ %ms Disable
dBm+Hz dBm Hz/ACV Disable
5.1.3 AC/DC Milli Voltage Measurement (ACmV, DCmV)
WARNING: The measurement voltage must not exceed DC250V or AC peak voltage 250V!
The measurement of AC/DC milli voltage has three modes: DCmV, ACmV+Hz and dBm+Hz.
1) Press function key mV .
2) Press SELECT key to select measurement mode.
3) According to poetical demands, press REL, MAX/MIN and 2nd VIEW keys to have relative measuring or
record.

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4) The meter is default in auto range mode and will automatically select a most suitable range. To select a
range manually for the measurement, press RANGE key to select a proper range. There are two ranges
to choose from: 80.000mV/800.00mV
5) Connect the black test lead to “COM” terminal and the red test lead to “VΩHz” terminal.
6) Touch the test leads to the test points and read the display on both the primary and secondary display.
Press SELECT Primary display Secondary display
(
Press 2nd VIEW
)
Analog bar, MAX/MIN/AVG,
REL, HOLD functions
DCmV ACV Available
ACmV+Hz ACmV Hz/ %/ %/ ms/ %ms Disable
dBm+Hz dBm Hz/ACmV/DCmV/(AC+DC)mV Disable
NOTE:
In dBm measurement mode, the decimal point of dBm is fixed between the second and third digits.
In dBm measurement, the impedance is default at 600Ω. To change the impedance, press RANGE key
to select proper impedance. The impedance can be chosen from:
4/8/16/32/50/75/93/110/125/135/150/200/250/300/500/600/800/900/1000/1200Ω.
In milli voltage measurement mode, the input impedance is more than 1000MΩ. The test leads are in
open circuit, which can be easily affected by external interference. Some random digits appear on the
display, or display shows zero or a few digits. This is normal and will not affect measurement results.
In milli voltage measurement mode, in order to obtain AC+DC function, the input terminal of ADC does
not employ coupling capacitor. Therefore, never apply a voltage over double value of DC or AC voltage
of the rated value of this range.
5.2 AC/DC Current Measurement
WARNING:
To avoid injury and damage to the meter, never attempt an in-circuit current measurement when
the fuse is blown, or when the voltage between open circuit and the ground is 1000V.
To avoid damage to the meter, check the meter’s fuse before proceeding.
Before current measurement, turn of the circuit power supply, discharge the high voltage
capacitance.
Under no circumstances, do not test the voltage when the test leads are plugged in “mA” or “20A”
terminals.
Do not place the probes in parallel with a circuit or component when the leads are plugged into
the current terminals.
5.2.1 AC/DC Milli Current Measurement (ACmA, DCmA)
The measurement of AC/DC milli current has four modes: DCmA, ACmA, (AC+DC)mA and ACmA +Hz.
1) Press function key mA .
2) Press SELECT key to select measurement mode.
3) According to practical demands, press REL, MAX/MIN and 2nd VIEW keys to have relative measuring or
record.
4) The meter is default in auto range mode and will automatically select a most suitable range. To select a
range manually for the measurement, press RANGE key to select a proper range. There are two ranges
to choose from: 80.000mA/800.00mA
5) Connect the black test lead to “COM” terminal and the red test lead to “mA” terminal.
6) Break the circuit path to be tested. Tough the black test leas to the negative of the break and the red test
lead to the positive of the break. Read the display.
7) After finishing measurement, disconnect the power supply to the circuit and discharge all high voltage
capacitors. Remove the meter and restore the circuit to normal operation. Pull out the test lead from “mA”

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terminal.
Press SELECT Primary display Secondary display Analog bar, MAX/MIN/AVG,
REL, HOLD functions
DCmA DCmA Available
ACmA ACmA Available
(AC+DC)mA (AC+DC)mA ACmA Disable
ACmA+Hz ACmA Hz Disable
5.2.2 AC/DC Current Measurement (ACA, DCA)
The measurement of AC/DC current has four modes: DCA, ACA, (AC+DC)A and ACA +Hz.
1) Press function key 20A .
2) Press SELECT key to select measurement mode.
3) According to poetical demands, press REL, MAX/MIN and 2nd VIEW keys to have relative measuring or
record.
4) The meter is default in auto range mode and will automatically select a most suitable range. To select a
range manually for the measurement, press RANGE key to select a proper range. There are two ranges
to choose from: 8.0000A/20.000A
5) Connect the black test lead to “COM” terminal and the red test lead to “20A” terminal.
6) Other operations apply the same as explained in section 5.2.1.
Press SELECT Primary display Secondary display Analog bar, MAX/MIN/AVG,
REL, HOLD functions
DCA DCA Available
ACA ACA Available
(AC+DC)A (AC+DC)A ACA Disable
ACA+Hz ACA Hz Disable
5.3 Resistance Measurement
WARNING: To avoid damage to the meter or the measurement equipments disconnect circuit
power and discharge all high voltage capacitors before measuring resistance. Use the DC function to
confirm that the capacitor is discharged.
CAUTION: When measuring low resistance, the resistance of the test leads may cause an
error of 0.1Ω~0.5Ωin the test results. To avoid this error, first short the test leads, next press REL key.
The primary display will be null and the secondary display displays the resistance of test lead. Measure
the to-be tested resistance and the result will be displayed on the primary display.
The measurement of resistance has three modes: normal, continuity and high resistance.
Normal mode (Ω)
1) Press function key OHM.
2) According to practical demands, press REL, MAX/MIN and 2nd VIEW keys to have relative measuring or
record.
3) The meter is in auto range mode and will automatically select a most suitable range. To select a range
manually for the measurement, press RANGE key to select a proper range. There are six ranges to
choose from: 800.00Ω/8.0000kΩ/80.000kΩ/800.00kΩ/8.0000MΩ/80.000MΩ
4) Connect the black test lead to “COM” terminal and the red test lead to “VΩHz” terminal.
5) Touch the probes to the test points and read the display.
Press SELECT Primary display Secondary display Analog bar, MAX/MIN/AVG,
REL, HOLD functions
ΩΩ/kΩ/MΩMAX/MIN/AVG, REL values Available

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Continuity mode ( )
1) Press function key OHM.
2) Press SELECT key to select “ ” mode.
3) Touch the probes to the test points and read the display.
4) If the measurement points resistance falls below 50Ω. The beeper will sound.
5) Analog bar, REL, MAX/MIN/AVG, A-H functions are disable in continuity mode.
High resistance mode (Hi Ω)
1) This function is used to measure the resistance above 80MΩ.
2) Press function key OHM.
3) Press SELECT key to select “Hi Ω” mode. The primary display will display “Hi”
4) Touch the probes to the test points and read the display.
5) Hi resistance mode is with single range 8000.0MΩ. If the measurement points resistance falls below 10MΩ
and above 8000.0MΩ, “OL” will appears on the display.
6) Analog bar, REL, MAX/MIN/AVG, HOLD functions are disabled in high resistance mode.
5.4 Capacitance Measurement
WARNING: To avoid damage to the meter or the measurement equipments disconnect circuit
power and discharge all high voltage capacitors before measuring capacitance. Use the DC function
to confirm that the capacitor is discharged.
NOTE:
Some capacitors have polarities. In measuring polaritive capacitors, touch the red test lead to the positive
polarity and the black test lead to the negative polarity.
In measuring low capacitance, the resistance of the test leads may cause an error in the test results. To
avoid this error, first short the test leads, next press REL key. The primary display will be null and the
secondary display displays the resistance of test lead. Measure the to-be tested resistance and the result
will be displayed on the primary display.
Capacitor is capable of storing electric charge. When measuring capacitance, only the value on a stable display
is the correct result.
1) Press function key .
2) According to practical demands, press REL, MAX/MIN and 2nd VIEW keys to have relative measuring or
record.
3) The meter is default in auto range mode and will automatically select a most suitable range. To select a
range manually for the measurement, press RANGE key to select a proper range. There are six ranges
to choose from: 1.0000nF/10.000nF/100.00nF/1.0000μF/10.000μF/100.00μF
4) Connect the black test lead to “COM” terminal and the red test lead to “VΩHz” terminal.
5) Touch the probes to the test points and read the display.
6) Analog bar and HOLD functions are disabled in capacitance measurement.
Measurement Primary display Secondary display MAX/MIN/AVG, REL functions
CAP nF/μF MAX/MIN/AVG, REL values Available
5.5 Frequency and Rotation Speed Measurement
The measurement of frequency and rotation speed measurement have three modes: normal, high frequency
and RPM.
NOTE:

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All frequency measurement is in auto range, no manual range available.
Measurement in Hi Hz and RPM modes requires special accessories, which are not provided as standard
accessories to this meter.
Analog bar, REL, MAX/MIN/AVG, HOLD functions are disabled in frequency measurement.
Normal mode
1) Press function key Hz/DUTY.
2) In normal mode, the frequency measurement range is 0.5Hz~8.0000MHz, divided into six ranges:
99.999Hz/999.99Hz/9.9999kHz/99.999kHz/999.99kHz/8.0000MHz.
3) The meter is in auto range mode and will automatically select a most suitable range.
4) Touch the probes to the signal source and read the display.
Press SELECT Primary display Secondary display
(
Press 2nd VIEW
)
Analog bar, MAX/MIN/AVG,
REL, HOLD functions
Hz Hz/kHz/MHz %/ %/ ms/ %ms Disable
RPM Measurement
In RPM mode, the measurement range is 0~99999RPM, accuracy ±(0.05% of reading+5). Use the RPM
accessory to test the rotation speed and read the display.
Press SELECT Primary display Secondary display Analog bar, MAX/MIN/AVG,
REL, HOLD functions
RPM RPM Disable
5.6 Temperature Measurement
The measurement of temperature has two modes: normal and high temperature.
NOTE: All temperature measurement is in auto range, no manual range available.
1) Press function key TEMP.
2) Press SELECT key to select normal mode and “Hi TEMP” mode.
3) In normal mode, read the display without any connection.
4) In Hi temp mode, use K type thermocouple to measure temperature.Connect the black test lead to
“COM” terminal and the red test lead to “VΩHz” terminal. Read the display.
Press SELECT Primary display Secondary display Analog bar, MAX/MIN/AVG,
REL, HOLD functions
℃-℉-00.00~80.000℃32.00~176.00℉Disable
Hi ℃-℉-50~1372℃-58~2502℉Disable
5.7 Diode Check
WARNING: To avoid damage to the meter or the measurement equipments disconnect circuit
power and discharge all high voltage capacitors before measuring. Use the DC function to confirm that
the capacitor is discharged.
1) Press function key .
2) Connect the black test lead to “COM” terminal and the red test lead to “VΩHz” terminal.
3) Touch the red test lead to the positive polarity of the diode and the black test lead to the negative polarity,
read the display.

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Measurement Primary display Secondary display MAX/MIN/AVG, REL,
HOLD functions
Diode V
Open: >2.0V. Diode is in open
circuit or connected in wrong
polarities.
------: 0.1V-2.0V. Diode is
normal.
Short: <0.1V. Diode is in short
circuit. The beeper sounds.
Disable
5.8 Square Waveform Output
The meter can be used as a square waveform generator, output the waveform with frequency range of
0.5Hz~5kHz.
1) Press function key OUT. The square waveform will be output on “COM” and “VΩHz” terminals. The
output square waveform is default at 606.1Hz, duty cycle 50%
2) Connect the black test lead to “COM” terminal and the red test lead to “VΩHz” terminal.
3) Press 2nd VIEW key to select the frequency from the following ranges:
0.5000Hz/1.0000Hz/2.0000Hz/10.00Hz/50.000Hz/60.240Hz/074.63Hz/100.00Hz/151.50Hz/200.00Hz/3
03.00Hz/606.10Hz/1.2500kHz/1.6660kHz/2.5000kHz/5.0000kHz.
4) Press SELECT key to select the duty cycle from 1% to 99%
5) Press 2nd VIEW key for at least 2 seconds to return to default setting.
Function Primary display
(
Press 2nd VIEW
)
Secondary display
(
Press SELECT
)
Analog bar, MAX/MIN/AVG,
REL, HOLD functions
OUT Hz/kHz 1%-99% Disable
5.9 Backlight Display
Press “ ’ key to turn on backlight. Press it again to turn it off.

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6. PROGRAMMABLE CONTROL
The unit is equipped with RS232 interface and relevant software, which allows easy connections to PC for
remote control.
Software operating environment: Windos9x/NT/2000/XP/Win7/WIN10
6.1 RS232 Port Set
RS232 port is used for the data transfer between the meter and PC. There are two ports to be chosen from:
COM1 and COM2.
6.2 Connect
Click “Connect” to activate the communication between the meter and PC. To disconnect the communication,
click “Disconnect”.
6.3 Recording Size
User can store up to 8192 files to the meter`s memory。
6.4 Sampling Interval
The sampling interval can be set at any value between 0.1~99 seconds.
6.5 Alarm Setup
This function sets the upper and lower limits for alarm. If the measurement results exceed the preset upper or
lower limits, the PC will send out alarm with sound.
This function is used with alarm limits Hi (High) and Lo (Low). If the measurement value more than Alarm Hi
or less than Alarm Lo, the beeper (of the host computer) will sound. The Alarm signal can be select for "Beep
without stop" or "Beep 3 Times".
6.6 Auto Schedule
In this function, user can set up the start and end time of recording.
6.7 Open File
This function opens the stored files (History.txt), which include text file and graph file. The files can be renamed
or printed out. Move the mouse to the graph area; click the right key to display details.
6.8 Exit
Exit the current system.

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6.9 Digital Display Window
The digital display window displays exactly the same contents as the meter LCD display does. However, the
digital display window on the PC gives you an easier view.
6.10 Push Key Panel
Basically, the keys on this panel have the same function as the keys on the meter. Double click on the key
functions the same as pressing the meter’s key for 2 seconds.
6.11 Analog Display Window
The analog display window displays exactly the same as the analog display area of the meter LCD display.
The function and range parts display the current communication status, which allows users understand the
millimeter’s working state.
When the value is positive, the analog needle turns to green; while the value is negative, the needle turns to
blue. When the value is close to zero, the needle changes between yellow and red colors.

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6.12 Real-time Graph Window
Before applying this function, user must choose a desired measuring range. The X axis indicates system time,
while the Y axis indicates the range of measurement data.
6.13 Recorder Control Panel
In this panel function, user can set up max.and min. values of the recording time. The Start, Stop and Reset
keys are used to control the data recorder. Click Start key to start the data recording and Stop key to stop the
data recording. In the meanwhile, the data has been stored in the History.txt file.
Click the Reset key to clear the current data in History.txt file, and get ready for the next data recording.
Recorder, Record time and Record in the bottom part of the panel indicate the current status of the data
recorder. Battery indicates the power supply status of the meter. If power supply is in good status, it will display
“Battery: High”. Otherwise, it will display “Battery: Low”.
The system time is displayed in the right corner of the bottom display.

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7. SPECIFICATIONS
7.1 Electrical Specifications
The accuracy is specified for one year after calibration at operating temperature of 18℃to 28℃, with humidity
at 0%~75%.
DCV
Range Resolution Accuracy Remarks
80mV 1μV ±(3% rdg+10)
Input impedance:
80mV~800mV: >1000MΩ
8V~1000V: 10MΩ
800mV 10μV
±(0.05% rdg+5)
8V 0.1mV
80V 1mV
800V 10mV
±(0.08% rdg+10)
1000V 0.1V
ACV (True RMS)
Range Resolution
Accuracy
<75% Range
@
50Hz~20kHz
<75% Range
@
20kHz~50kHz
>75% Range
@
50Hz~20kHz
80mV 1μV ±(0.8% rdg+50) ±(6.0% rdg+50) ±(8.0% rdg+50)
800mV 10μV ±(0.8% rdg+50) ±(5.0% rdg+50) ±(8.0% rdg+50)
8V 0.1mV ±(0.8% rdg+50) ±(5.0% rdg+50) ±(8.0% rdg+50)
80V 1mV ±(0.8% rdg+50) ±(8.0% rdg+50)
750V 10mV
<90% Range@50Hz~1kHz: ± (0.8% rdg+50)
>90% Ran
g
e
@
50Hz~1kHz: ±
(
5.0% rd
g
+50
)
Remarks:
Input impedance: 80mV~800mV: >1000MΩ; 8V~1000V: DC10MΩ. Parallel capacitance: <100pF.
DCA
Range Resolution Accuracy Remarks
80mA 1μA ±(0.2% rdg+10)
Fuse: F750mA/250V and F13A/250V
Voltage drop: ≤800mV
Max. input current: 20A (<15 seconds)
800mA 10μA ±(0.2% rdg+10)
8A 0.1mA ±(0.8% rdg+10)
20A 1mA ±(1.5% rdg+10)
ACA (True RMS)
Range Resolution Accuracy Remarks
80mA 1μA 50Hz~5kHz
±(0.8% rdg+20) Fuse: F750mA/250V and F13A/250V
Voltage drop: ≤800mV
Max.input current: 20A (<15 seconds)
800mA 10μA
8A 0.1mA
50Hz~500Hz
±
(
1.5% rd
g
+20
)
20A 1mA
50Hz~500Hz
±
(
2.0% rd
g
+20
)
dBm
Range Resolution Accuracy
-80.00dBm~+80.00dBm 0.01dBm ±1.0% rdg