ennoLogic eM870M User manual

eM870M Insulation Multimeter
User Manual

ennoLogic eM870M Insulation Multimeter
Made in China
User Manual Version 1.1. Revised 1/5/2018.
© 2018 ennoLogic®. All rights reserved.
https://ennologic.com

ennoLogic eM870M Insulation Multimeter
Table of Contents
Table of Contents
1. Precautionary Safety Measures........................................................................................................................1
1.1 Important Note: Limited Liability...............................................................................................................................1
1.2 Meter Safety Standards...............................................................................................................................................1
1.3 Warnings.....................................................................................................................................................................2
2. Instrument Description.....................................................................................................................................4
2.1 Features Overview ......................................................................................................................................................4
2.2 Main User Elements....................................................................................................................................................5
2.3 LCD Display.............................................................................................................................................................10
3. Function Descriptions .....................................................................................................................................13
3.1 General Functions.....................................................................................................................................................13
3.1.1 TRUE RMS Measurement ................................................................................................................................................ 13
3.1.2 Manual ranging and auto range mode ............................................................................................................................... 13
3.1.3 Maximum, Minimum and Average Value Measurements................................................................................................. 14
3.1.4 Automatic Shutdown......................................................................................................................................................... 15

ennoLogic eM870M Insulation Multimeter
Table of Contents
3.1.5 Low Battery Voltage Detection......................................................................................................................................... 15
3.1.6 Backlight ........................................................................................................................................................................... 15
3.1.7 Data Hold .......................................................................................................................................................................... 15
3.2 Measurement Functions............................................................................................................................................16
3.2.1 AC Voltage Measurement................................................................................................................................................. 16
3.2.2 DC Voltage Measurement ................................................................................................................................................. 18
3.2.3 DC mV/AC mV Measurement .......................................................................................................................................... 20
3.2.4 Frequency & Duty Cycle of Digital Signals and Temperature Measurements.................................................................. 22
3.2.5 Diode and Continuity Tests............................................................................................................................................... 24
3.2.6 Resistance Measurement ................................................................................................................................................... 26
3.2.7 Capacitance Measurement................................................................................................................................................. 28
3.2.8 DC and AC μA Current Measurement .............................................................................................................................. 30
3.2.9 DC and AC mA Current Measurement ............................................................................................................................. 32
3.2.10 Insulation Resistance Measurement ................................................................................................................................ 34
3.2.11 Frequency Measurement of Sinusoidal Signals............................................................................................................... 36

ennoLogic eM870M Insulation Multimeter
Table of Contents
4. Technical Specifications..................................................................................................................................37
4.1 General Specifications ..............................................................................................................................................37
4.2 Measurement Specifications.....................................................................................................................................38
4.2.1 AC Voltage........................................................................................................................................................................ 38
4.2.2 DC Voltage........................................................................................................................................................................ 38
4.2.3 AC Current ........................................................................................................................................................................ 39
4.2.4 DC Current ........................................................................................................................................................................ 39
4.2.5 Resistance.......................................................................................................................................................................... 39
4.2.6 Capacitance ....................................................................................................................................................................... 40
4.2.7 Diode................................................................................................................................................................................. 40
4.2.8 Frequency of Square Waveforms ...................................................................................................................................... 40
4.2.9 Temperature....................................................................................................................................................................... 40
4.2.10 Frequency of Sinusoidal Signals ..................................................................................................................................... 40
4.2.11 Duty Cycle....................................................................................................................................................................... 41
4.2.12 Insulation Resistance....................................................................................................................................................... 41

ennoLogic eM870M Insulation Multimeter
Table of Contents
5. Maintenance.....................................................................................................................................................42
5.1 General Maintenance ................................................................................................................................................42
5.1 Battery Replacement.................................................................................................................................................42
5.2 Fuse Replacement.....................................................................................................................................................43
6. Accessories........................................................................................................................................................44

ennoLogic eM870M Insulation Multimeter
Precautionary Safety Measures
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1. Precautionary Safety Measures
1.1 Important Note: Limited Liability
Cascadia Innovations is the exclusive distributor of all ennoLogic®products. Except as explicitly stated, Cascadia
Innovations is not liable for direct, indirect, incidental, or other types of damages arising out of, or resulting from the
use of this product. By using the eM870M you agree to hold ennoLogic®and Cascadia Innovations harmless for any
and all consequences of the use of this product or application of data from the use of this instrument.
1.2 Meter Safety Standards
The insulation multimeter eM870M was designed and manufactured according to the safety requirements specified in
the IEC61010-1 standard for electronic test instruments and hand-held digital multimeters. Its design and
manufacturing comply with Measurement Category 1000V CAT III of IEC 61010-1 and Pollution Degree 2.
The meter conforms to the following European Union directives: 89/336/EEC (Electromagnetic Compatibility EMC),
73/23/EEC (Low Voltage Directive LVD) and 93/68/EEC (CE Mark).

ennoLogic eM870M Insulation Multimeter
Precautionary Safety Measures
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1.3 Warnings
Before first use of the meter please check if the housing shows any cracks or if any plastic parts are missing, and
check whether the test leads are damaged or have any exposed metal. The meter must be used only if there are no
problems or damage affecting insulation.
Please read the operating instructions and safety measures sections in this manual carefully. Using the meter
outside the methods specified in this manual may cause damage to the meter or other equipment.
Do not use the meter or test leads if they appear to be damaged.
Do not operate the meter around explosive gas, steam, vapor or dust.
Caution when working with voltages above 60V DC or 30V AC rms, there is the possibility of a shock hazard.
Avoid direct body contact with ground during measurement, or with any metal object that may be at ground
potential. The body should be kept insulated from ground with dry insulating shoes, insulating pads or insulating
clothes.
When performing measurements with a test probe make sure you grab the probe behind the protective plastic ridge
designed to protect your fingers from making accidental contact with the probe tip or circuit.

ennoLogic eM870M Insulation Multimeter
Precautionary Safety Measures
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Do not attempt to measure voltages above 1000V AC or 1000V DC, the meter may get damaged and/or the
operator’s safety may be threatened if the maximum limit for voltage measurements is exceeded.
To avoid false readings, which could lead to possible electric shock or personal injury, replace the battery as soon
as the battery indicator appears.
Before installing or replacing the battery, disconnect test leads and/or any connectors from any circuit under test,
turn the meter off and remove test leads from the input terminals.
Use AAA batteries and make sure to insert them with the proper polarity.
When measuring voltage or current be certain that the test leads are connected to the correct input terminals.
Any adjustments, maintenance or repair work on the meter should only be performed by qualified personnel.
If any faults or abnormalities are observed, take the instrument out of service and ensure that it cannot be used
until it has been checked out.
If the meter is not going to be used for an extended period of time, take out the batteries and do not store the meter
in high temperature or high humidity environments.

ennoLogic eM870M Insulation Multimeter
Instrument Description
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2. Instrument Description
2.1 Features Overview
5000 counts digital display
AC Voltage and DC Voltage measurements up to 1000V
DC measurement accuracy as low as 0.1%
High resolution: resistance 0.1Ω, voltage 10µV
Digital frequency and sinusoidal frequency measurement, as well as duty cycle
Capacitance measurements, range 0.1nF to 1000µF
AC True RMS measurements
Maximum and minimum values
Insulation resistance measurement, range: 50KΩ to 2GΩ
Automatic shutdown or continuous-ON mode
Backlight
Overload protection
Secondary plastic shell with insulating performance of 1000V CAT III

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Instrument Description
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2.2 Main User Elements
The front panel is shown in Figure 2-1,
and its user elements are described below:
Figure 2-1
1
15
234
5
6
12
11
7
89
10
14
13
uA
mA
V
mV
Hz
Insulation+DMM
VINS 50V
1000V
Insulation
ON/OFF
INS mA uA COM V Hz
CAT II 1000V
CAT III 600V
500mA MAX
INSULATION
MAX/MIN LIGHT
Hz/Duty
BEEP
RANGE HOLD

ennoLogic eM870M Insulation Multimeter
Instrument Description
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(1)
V Hz
Terminal
Connection terminal for the red (positive) test lead for all measurement functions except for current measurement and insulation
resistance measurement. Hereinafter referred to as V terminal.
(2) COM Terminal
Connection terminal for the black (common reference) test lead for all measurements except for insulation resistance
measurement.
(3) mA/µA Terminal
Connection terminal for the red (positive) test lead during mA or µA current measurements. It is also the connection terminal
for the black test lead for insulation resistance measurements.
(4) INS Terminal
Connection terminal for the red test lead during insulation resistance measurements.
(5) Rotary Switch
Used for selecting measurement functions including AC voltage, DC voltage, millivolt, frequency/temperature,
diode/continuity, resistance, capacitance, microamp current, milliamp current, and insulation resistance.

ennoLogic eM870M Insulation Multimeter
Instrument Description
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(6) POWER Switch
Press this switch to turn the meter on and off.
(7) SELECT Key
When the rotary switch is set to position mV, µA, or mA, press the SELECT key to select either DC or AC mode.
When the rotary switch is set to position Hz / Temperature, press the SELECT key to select either frequency / duty cycle
mode or temperature mode.
When the rotary switch is set to position Diode / Continuity, press the SELECT key to select either diode or continuity
mode.
For all other measurement functions, pressing this key has no effect.
To disable the auto power off feature, press and hold the SELECT key while turning the on with the Power switch.
(8) MAX/MIN Key
This key is for measuring maximum, minimum and average values.
1. Press once to enter MAX/MIN/AVG mode.
2. Press again, and the LCD will display the Minimum Value.
3. Press a third time and the LCD will display the Maximum Value.

ennoLogic eM870M Insulation Multimeter
Instrument Description
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4. Press a fourth time and the LCD will display the Average Value.
5. To return to normal measurement mode, press and hold this button for two seconds.
(9) Hz/Duty Key
When the rotary switch is set to position Hz / Temperature, pressing the HZ/DUTY key will switch between frequency and
duty cycle measurement mode.
When any of the AC voltage or AC current measurement functions are selected, pressing the Hz/DUTY key will turn on
the frequency measurement mode. In this mode, the meter will measure and display the frequency of the signal instead of
its voltage or current. Press this key again to exit frequency measurement mode.
(10) LIGHT key
Pressing this key briefly will turn on the backlight of the LCD display, and pressing it again will turn it off. The backlight will
also turn off automatically after ten seconds.
(11) TEST key
During insulation resistance measurement, press the TEST key to start measuring, and press it again to stop measuring.
(12) RANGE key
When the temperature measurement function is selected, press the RANGE key to select Celsius or Fahrenheit.

ennoLogic eM870M Insulation Multimeter
Instrument Description
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For V~, V , mV, , , A and mA measurements, the RANGE key is used to manually select ranges:
1. Press RANGE to enter the manual ranging mode.
2. Press RANGE to step through the ranges available for the selected function.
3. Press and hold RANGE for 2 seconds to return to auto-ranging.
When measuring digital frequencies or testing diodes, pressing the RANGE key will have no effect.
When performing insulation resistance measurement, use the RANGE key to manually select a test voltage range. There is
no auto-range mode available when measuring insulation resistance.
(13) BEEP Key
When measuring continuity, press the BEEP key to select whether the meter beeps or not when a short is detected.
(14) HOLD Key
Pressing the HOLD key causes the meter to stop updating the display and freezes the current reading. Pressing it again will
resume normal measurement mode.
(15) LCD Display
Displays the measurement readings and various modes (described in detail in the following section.)

ennoLogic eM870M Insulation Multimeter
Instrument Description
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2.3 LCD Display
Figure 2—2
1
17
546
7
8
9
10
12
3
13
1415
16
11
18
19
2

ennoLogic eM870M Insulation Multimeter
Instrument Description
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The LCD screen is shown in Figure 2-2 above, and the meanings of the symbols are explained in Table 1 below:
Number of Order
Symbol
Functions
1
µn°F°C
Indicates the measurement unit being either °F or °C for temperature, or µF
or nF for capacitance
µmAV
Indicates the measurement unit being either µA or mA for current, or µV and
mV for voltage
KHz
Indicates the measurement unit being either kHz or Hz for frequency
MKGΩ
Indicates the measurement unit being MΩ, kΩ, GΩ or Ω for resistance
2
The meter is in Diode Test mode.
3
The meter is in Continuity Test mode.
4
The meter is measuring duty cycle.
5
AVG
MAX
MIN
MAX MIN
The display shows the average value (AVG), maximum value (MAX),
minimum value (MIN) or current value (MAX MIN) while in
MAX/MIN/AVG mode.
6
The meter is in Data Hold mode.
7
Warning –High Voltage!
8
AC
Indicator for AC voltage or current
9
DC
Indicator for DC voltage or current

ennoLogic eM870M Insulation Multimeter
Instrument Description
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Table 1 (continued)
10
Indicates negative readings
11
Indicates overload condition when measuring insulation resistance
12
AUTO RANGE
The meter is in Auto range mode in which the meter automatically
selects the range with the best resolution.
13
MANUAL RANGE
The meter is in Manual Range mode in which the user manually
selects the appropriate measurement range.
14
2500V
1000V
Indicates the applied test voltage when performing insulation
resistance measurements (either 50V, 100V, 250V, 500V, or 1000V)
15
TEST
Indicates that an insulation resistance test is now being performed.
16
Low battery indicator
17
Measurement value display area
18
51000
Range indicator when selecting ranges manually such as 5, 50, 500,
1000, 5000, etc.
19
-1888VDC
Real-time display of the applied test voltage when performing
insulation resistance measurements

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Function Descriptions
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3. Function Descriptions
3.1 General Functions
3.1.1 TRUE RMS Measurement
All AC measurement values are true RMS (true root-mean-square) values. This distinguishes this meter from other meters that
only measure average AC values.
3.1.2 Manual ranging and auto range mode
The Meter has both manual ranging and auto range options. It defaults to auto range mode when turned on.
•In auto range mode, the meter selects the best range for the input detected. This allows you to switch test points
without having to reset the range.
•In manual ranging mode, you override auto range and lock the meter into a specific range.
•The meter defaults to auto range mode in measurement functions that have more than one range. When the meter is in
auto range mode, the symbol “AUTO RANGE” is displayed.
•When the LCD display shows “OL”, it indicates that the measured value exceeds the meter’s maximum range.

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Function Descriptions
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To enter and exit manual ranging mode:
1. Press the RANGE key. The meter enters manual ranging mode. The LCD symbol “AUTO RANGE” changes to
“MANUAL RANGE”. Each press of the RANGE key increments the range, and the display shows the maximum value
for the selected range next to the symbol “MANUAL RANGE”. When the highest range is reached, the Meter wraps
back to the lowest range.
2. To exit manual ranging mode, press and hold down the RANGE key for two seconds. The Meter returns to the auto
range mode and “AUTO RANGE” is displayed.
3.1.3 Maximum, Minimum and Average Value Measurements
Press the MAX/MIN key to enter the maximum/minimum/average value mode. The meter will continuously track and update
the maximum, minimum, or average values based on which of the three modes is selected.
After entering this mode, the instantaneous value continues to be displayed. Press the MAX/MIN key again, and the LCD will
display the Minimum Value since this mode was entered. Press it a third time and the LCD will display the Maximum Value.
Press it a fourth time and the LCD will display the Average Value. Press it one more time to return to displaying the
instantaneous value. Press and hold the MAX/MIN key for two seconds and the meter will return to the normal measurement
mode.After exiting the MAX/MIN/AVG value mode the recorded maximum, minimum and average values will disappear.