Brymen BM885 User manual

USER'S
MANUAL
BM887
BM885
Insulation Tester
Combination
Multimeter

1
1) SAFETY
This manual contains information and warnings that must be followed for operating the
meter safely and maintaining the meter in a safe operating condition. If the meter is
used in a manner not specified by the manufacturer, the protection provided by the
meter may be impaired.
Terms in this manual
WARNING identifies conditions and actions that could result in serious injury or even
death to the user.
CAUTION identifies conditions and actions that could cause damage or malfunction
in the instrument.
WARNING
To reduce the risk of fire or electric shock, do not expose this product to rain or
moisture. The meter is intended only for indoor use.
Observe proper safety precautions when working with voltages above 33 Vrms, 46.7
Vpeak or 70 VDC. These voltage levels pose a potential shock hazard to the user.
Before and after hazardous voltage measurements, check the voltage function on a
known source such as line voltage to determine proper meter functioning.
The meter meets UL/IEC/EN61010-1 Ed. 3.0, CAN/CSA C22.2 No. 61010-1 Ed. 3.0,
UL/IEC/EN61010-2-033 Ed. 1.0 to Measurement CAT-III 1kV and CAT-IV 600V, AC &
DC. The meter also meets the relevant Parts of EN61557. In particular, Part 1 Ed. 2.0,
Part 2 Ed. 2.0 and Part 10 Ed. 2.0. These relevant parts of EN61557 are not covered
by the ETL certification.
The accompanied test probe assembly meets UL/IEC/EN61010-031 Ed. 1.1 to the
same meter ratings or better. IEC 61010-031 requires exposed conductive test probe
tips to be ≤ 4mm for CAT III & CAT IV ratings. Refer to the category markings on your
probe assemblies as well as on the add-on accessories (like detachable Caps or
Alligator Clips), if any, for applicable rating changes.
Keep your hands/fingers behind the hand/finger barriers (of the meter and the test
probe assembly, where applicable) that indicate the limits of safe access of the hand-
held parts during measurements. Inspect lead wires, connectors, and probes for
damaged insulation or exposed metal before using the meter. If any defects are found,
replace them immediately. Only use the probe assembly provided with the meter or a

2
UL Listed Probe Assembly to the same meter ratings or better.
CAUTION
Disconnect the test leads from the test points before changing functions.
International Electrical Symbols
Marking of Electrical and Electronic Equipment (EEE). Do not dispose of this
product as unsorted municipal waste. Contact a qualified recycler
Caution! Refer to the explanation in this Manual
Caution! Possibility of electric shock
Earth (Ground)
Meter protected throughout by Double Insulation or Reinforced insulation
Fuse
Direct Current (DC)
Alternating Current (AC)
3 Three-phase Alternating Current
Brief Information about Measurement Categories
Measurement Category IV is applicable to test and measuring circuits connected at
the source of the building’s low-voltage MAINS installation. Examples are
measurements on devices installed before the main fuse or circuit breaker in the
building installation.
Measurement Category III is applicable to test and measuring circuits connected to
the distribution part of the building’s low-voltage MAINS installation. Examples are
measurements on distribution boards (including secondary meters), circuit-breakers,
wiring, including cables, bus-bars, junction boxes, switches, socket-outlets in the fixed
installation, and equipment for industrial use and some other equipment such as
stationary motors with permanent connection to the fixed installation.
Measurement Category II is applicable to test and measuring circuits connected
directly to utilization points (socket outlets and similar points) of the low-voltage MAINS
installation. Examples are measurements on MAINS CIRCUITS of household
appliances, portable tools and similar equipment.
2) CENELEC DIRECTIVES
The instruments conform to CENELEC Low-voltage directive 2014/35/EC,
Electromagnetic compatibility directive 2014/30/EU and RoHS directive 2011/65/EU.

3
3) PRODUCT DESCRIPTION
Note: Top of the line model is used as representative for illustration purposes. Please
refer to your particular model for function availability.
Analog bar-graph
The analog bar graph provides a visual indication of measurement like a traditional
analog meter needle. It is excellent in detecting faulty contacts, identifying
potentiometer clicks, and indicating signal spikes during adjustments.
1) 3-5/6 digits 6000 counts
dual displays
2) Push-buttons for special
functions & features
3) Selector to turn the
Power On or Off and Select
a function
4) Input Jack for Insulation
function Ground reference
or mA/µA function
positive input
5) Common (Ground
reference) Input Jack for all
functions EXCEPT
Insulation Resistance
function
6) Input Jack for all
functions EXCEPT A, mA
and µA functions
7) Input Jack for A function
positive input

4
4) OPERATION
CAUTION
Before and after hazardous voltage measurements, test the voltage function on a
known source such as line voltage to determine proper meter functioning.
ACV +Hz & VFD ACV +Hz functions
Press the SELECT button momentarily to toggle the subject functions. Last selection
will be saved as power up default for repeat measurement convenience. For ACV +Hz
function, press the RANGE button momentarily to select other ranges manually when
needed. For VFD ACV +Hz function, only 600V range is provided to best cope with the
measurements of most Variable Frequency Drives (VFD).
To select DCV function, turn the Rotary Knob to DCV position for measurements.

5
 Resistance, Continuity functions
Press the SELECT button momentarily to toggle the functions. Last selection will be
saved as power up default for repeat measurement convenience. Continuity function
is convenient for checking wiring connections and operation of switches. A continuous
beep tone indicates a complete wire.
CAUTION
Using resistance or continuity function in a live circuit will produce false results and
may damage the instrument. In many cases the suspected component must be
disconnected from the circuit to obtain an accurate reading
Auto leads resistance calibration
When entering the 60 range manually by RANGE button for high precision low
resistance measurement, this feature will prompt you to short the inputs for temporary
test lead resistance calibration on this range.
The fastest way is to short the leads to auto-range to the 60 range, then press the
RANGE button momentarily. The display shows ”Shrt”. Keep shorting the leads for
further 3 seconds until the display shows zero. The lead resistance is then temporarily
compensated.

6
The compensation value stays until the next meter power reset, and can be as high
as 5. If you need a compensation value that is higher than that, Relative Zero mode
is recommended.
Diode Test, Capacitance (Model 887 only) functions
Press the SELECT button momentarily to toggle the functions. Last selection will be
saved as power up default for repeat measurement convenience.
CAUTION
Discharge capacitors before making any measurement. Large value capacitors should
be discharged through an appropriate resistance load.
Normal forward voltage drop (forward biased) for a good silicon diode is between
0.400V to 0.900V. A reading higher than that indicates a leaky diode (defective). A
zero reading indicates a shorted diode (defective). An OL indicates an open diode
(defective). Reverse the test leads connections (reverse biased) across the diode. The
digital display shows OL if the diode is good. Any other readings indicate the diode is
resistive or shorted (defective).

7
DCmV, ACmV +Hz functions
Press the SELECT button momentarily to toggle the subject functions. Last selection
will be saved as power up default for repeat measurement convenience.

8
Temperature functions (Model 887 only)
Press SELECT button momentarily to toggle C and F readings. Last selection will be
saved as power up default for repeat measurement convenience.
Note: Be sure to insert the banana plug type-K temperature bead probe Bkp60 with
correct polarities. You can also use a plug adapter Bkb32 (Optional purchase)
with banana pins to type-K socket to adapt other standard type-K mini plug
temperature probes.

9
A, mA, µA Current functions
Press the SELECT button momentarily to toggle the DC or AC+Hz of the subject
functions. Last selection will be saved as power up default for repeat measurement
convenience.
For Model 885, A and mA functions are at different Rotary Switch positions.
Insulation Resistance function
WARNING
The two LCD icons & used together, throughout in this manual, is referred as
active measurements of Insulation Resistance function through the activation of the
TEST button on the meter or on the Remote Probe. The sources a user
selectable test voltage of 50V, 100V, 250V, 500V or 1000V to measure Insulation
Resistance values. The in a flashing manner warns against such test voltage is
being output. Use extreme caution when operating the to avoid electric shock.
is inhibited when the meter sounds 3-beeps and displays the detected voltage
value plus warning against an energized circuit of more than 30V is being
connected, before the is active. Measurements shall only be carried out on
parts of an installation or equipment that are de-energized.
Connecting to energized circuits when the is active will produce false results
and may damage the instrument. Always check with voltage functions and remove

10
power from the circuits before carrying out the .
Setup as illustrated below.
Press the RANGE (Test Voltage) button momentarily to select an intended test voltage
of 50V, 100V, 250V, 500V or 1000V in sequence. Last selection will be saved as
power up default for repeat measurement convenience.
The secondary display shows the selected voltage for 1 second right after the
selection, and then displays the actual detected voltage readings. The voltage
annunciator by the secondary display remains indicating the voltage selected.
The is active as long as the TEST button is pressed and hold. The TEST
buttons on the meter and on the Remote Probe work alike. The Insulation Resistance
readings are shown on the primary display.
Default startup primary display reading is “-.---”. Allow enough time for a good
measuring result. After the is released, the measuring loop starts to discharge
the testing voltage. The last measured resistance reading stays on the primary display
until the next or a function change. The secondary display keeps showing the
actual detected voltage readings.

11
Lock-Test mode is recommended for continuous measurements. To apply, press
the LOCK button momentarily to display the annunciator before pressing the
TEST button momentarily. The LCD will show both & to indicate
continuous measurement is active. Press again either button momentarily to release
the Lock-Test mode.
NOTE: Maximum display reading of each Insulation Resistance range is subjected to
the test voltage selected. They are 55.0MΩ, 110.0MΩ, 275MΩ, 550MΩ & 25.0GΩ for
50V, 100V, 250V, 500V & 1000V respectively. Over-range is indicated as > maximum-
display-reading.

12

13
Smooth mode (Insulation Resistance function only)
Smooth mode displays the running average of the last eight measured readings
having changes within 300 counts in sequence. On the contrary, it displays directly,
without smoothing, the measured reading that is beyond 300 counts in changes
comparing to its former one. Press the button momentarily to enable with LCD
annuciator “ ” turned on. Press momentarily again to disable.
Backlighted display
Press the button momentarily to toggle the LCD backlight. The backlight will also be
turned off automatically after approximate 10 minutes to extend battery life.
Auto- or Manual-ranging (Volts, Current & Ω functions only)
Press the RANGE button momentarily to select manual-ranging, and the meter will
remain in the range it was in, the LCD turns off. Press the button momentarily
again to select an adjacent range. Press and hold the button for 1 second or more to
resume auto-ranging.
Hold
The hold feature freezes the display for later view. LCD “ ” turns on. Press the HOLD
button momentarily to toggle the hold feature. This feature does not apply to Insulation
Resistance functions.
MAX/MIN Recording mode
Press REC button momentarily to activate MAX/MIN recording mode. The LCD “R” &
“MAX MIN” turn on. The meter beeps when a new MAX (maximum) or MIN (minimum)
reading is updated. Press the button momentarily to read the Real-time, MAX and MIN
readings in sequence. Press the button for 1 second or more to exit MAX/MIN
recording mode. When activated, Auto-Power-Off is disabled automatically. This
feature does not apply to Insulation Resistance functions.
Relative-Zero ( ) mode
Relative-Zero allows the user to offset the meter consecutive measurements with the
main display displaying reading as the reference value. LCD “ ” turns on. Press the
REL button momentarily to toggle Relative-Zero mode.
Beep-Jack™ Input Warning
The meter beeps as well as displays “InEr” to warn the user against possible damage
to the meter due to improper connections to the “ µA mA” or “A” input jack when

14
other functions, especially voltage function, is selected.
Set Beeper Off
Press the RANGE button while turning the meter on to temporarily disable the Beeper
feature. Turn the rotary switch OFF and then back on to resume.
Auto-Power-off (APO)
The Auto-Power-off (APO) mode turns the meter off automatically to extend battery life
after approximately 20 minutes of no rotary switch or push button operations. To wake
up the meter from APO, press the SELECT or button momentarily or turn the rotary
switch OFF and then back on. Always turn the rotary switch to the OFF position when
the meter is not in use.
Disabling Auto-Power-off
Press the SELECT button while turning the meter on to temporarily disable the Auto-
Power-Off feature. Turn the rotary switch OFF and then back on to resume.
5) MAINTENANCE
WARNING
To avoid electrical shock, disconnect the meter from any circuit, remove the test leads
from the input jacks and turn OFF the meter before opening the case. Do not operate
with open case. Install only the same type of fuse or equivalent
Calibration
Accuracy is specified for a period of one year after calibration. Periodic calibration at
intervals of one year is recommended to maintain meter accuracy
Cleaning and Storage
Periodically wipe the meter and the test probe assembly with a damp cloth and mild
detergent. Do not use abrasives or solvents. Allow to dry completely before operating.
If the meter is not to be used for periods of longer than 60 days, remove the battery
and store it separately
Trouble Shooting
If the instrument fails to operate, check battery, fuses, leads, etc., and replace as
necessary. Double check operating procedure as described in this user’s manual.
Refer to the LIMITED WARRANTY section for obtaining warranty or repairing service.

15
Battery and Fuse replacement
Battery use: Four 1.5V AA alkaline batteries (IEC LR6)
Fuses use:
Fuse (F2) for “ µA mA” input:
0.4A/1000Vac & Vdc, IR 30kA, F fuse; or better. Dimension: 6 x 32 mm
Fuse (F3) for “A” input:
11A/1000Vac & Vdc, IR 20kA, F fuse; or better. Dimension: 10 x 38 mm
Battery and Fuse replacement:
Loosen the screws from the access cover of the case bottom. Lift the access cover.
Replace the batteries or fuse. Re-fasten the screws.

16
GENERAL SPECIFICATION
Display: 3-5/6 digits 6,000 counts
Polarity: Automatic
Update Rate: 5 per second nominal
61 Segments Bar graph: 40 per second max
Operating Temperature: -10C to 50C
Relative Humidity: Maximum relative humidity 90% for temperature up to 28C
decreasing linearly to 50% relative humidity at 50C
Pollution Degree: 2
IP Rating: IP40
Storage Temperature: -20C to 60C, < 80% R.H. (with battery removed)
Altitude: Operating below 2000m
Temperature Coefficient: nominal 0.1 x (specified accuracy)/ C @(-10C ~ 18C or
28C ~ 50C), or otherwise specified
Sensing: AC, True RMS
Safety: ETL certified per IEC/UL/EN61010-1 Ed. 3.0, IEC/UL/EN61010-2-030 Ed. 1.0,
IEC/UL/EN61010-2-033 Ed. 1.0, IEC/UL/EN61010-031 Ed. 1.1 and the corresponding
CAN/CSA-C22.2 regulations to Measurement Categories:
CAT III 1000 V AC & DC and Category IV 600V AC & DC
Compliance to IEC/EN61557:
IEC/EN61557-1 Ed. 2.0, IEC/EN61557-2 Ed. 2.0 & IEC/EN61557-10 Ed. 2.0
(Tested per CE requirements, not covered by ETL certification)
Overload Protections:
Insulation Resistance, µA & mA: 0.4A/1KV, IR 30kA, F Fuse; or better
A: 11A/1KV, IR 20kA, F Fuse; or better
V: 1100Vrms
mV,  & Others: 1000 Vrms
Transient Protection: 8kV (1.2/50s surge)
E.M.C.: Meets EN61326-1:2013
In an RF field of 3V/m:
Total Accuracy = Specified Accuracy + 25 digits
Performance above 3V/m is not specified
Power Supply: Four Alkaline AA batteries (IEC LR6)
Power Consumption: 6.5mA typical except the followings:
VFD ACV +Hz: 8mA
Insulation Resistance @1mA test current:
50V output voltage: 25mA

17
100V output voltage: 45mA
250V output voltage: 85mA
500V output voltage: 170mA
1000V output voltage: 440mA
Tester can perform at least 950 insulation tests with new alkaline batteries at room
temperature. These are standard tests of 1000 V into 1 M  with a duty cycle of 5
seconds on and 25 seconds off.
Low Battery: approx. 4.6V
APO Timing: Idle for 20 minutes
APO Consumption: 20A typical
Dimension: L208mm X W103mm X H64.5mm with holster
Weight: 635 gm with holster
Accessories: Test probe pair, Alligator clip pair, BRP21S2-C Remote probe, Holster,
User's manual, Bkp60 banana plug type-K thermocouple (Model 887 only)
Optional Accessories: BKB32 banana plug to type-K socket plug adaptor (Model 887
only), BMH-01 magnetic hanger; BMP-86x soft carrying pouch
Special Features: Record MAX/MIN regular readings; Relative Zero; Display Hold;
LCD Backlight; VFD V & Hz readings; Dual display +Hz Readings; High resolution
60.00mV & 60.00 ranges, Lock-Test mode for Insulation resistance; BeepJackTM
audible & visible input warning
Electrical Specifications
Accuracy is (% reading digits + number of digits) or otherwise specified, at 23C 
5C & less than 80% relative humidity.
True RMS voltage & current accuracies are specified from 1 % to 100 % of range or
otherwise specified. Maximum Crest Factor < 1.8:1 at full scale & < 3.6:1 at half scale,
and with frequency components fall within the specified frequency bandwidth for non-
sinusoidal waveforms.

18
AC Voltage
RANGE Accuracy
Model 887 Model 885
50Hz ~ 60Hz
60.00mV 3), 600.0mV 4), 6.000V, 60.00V, 600.0V, 1000V 0.7% + 4d 0.7% + 4d
40Hz ~ 1kHz
60.00mV 3), 600.0mV 4), 6.000V, 60.00V, 600.0V 1.3% + 4d 1.3% + 4d
1000V 5) 2% + 4d 2% + 4d
1kHz ~ 5kHz
60.00mV 3), 600.0mV 4), 6.000V, 60.00V, 600.0V 2% + 4d 1) 3% + 5d
1000V Unspecified
5kHz ~ 20kHz 2)
60.00mV Unspecified
600.0mV 4) 2.5% + 20d 1)
Unspecified
6.000V, 60.00V 2% + 20d 1) Unspecified
600.0V, 1000V Unspecified
Input impedance: 10M, 110pF nominal
1)Add 20d @ >80% of range
2)Unspecified @ <5% of range
3)Signal peak absolute values, including DC bias, less than 110mVpeak
4)Signal peak absolute values, including DC bias, less than 1100mVpeak
5)For model 885, unspecified at bandwidth > 500Hz
VFD AC Voltage
RANGE Accuracy 1)
10Hz ~ 45Hz
600.0V 4.0% + 5d
45Hz ~ 200Hz
600.0V 2.5% + 5d
200Hz ~ 440Hz
600.0V 9.0% + 5d 2)
Input impedance: 10M, 110pF nominal
1)Unspecified for fundamental frequency > 440Hz
2)Accuracy linearly decreases from 2.5% + 5d @200Hz to 9.0% + 5d @440Hz

19
DC Voltage
RANGE Accuracy
Model 887 Model 885
60.00mV 0.2% + 3d 0.3% + 3d
600.0mV, 6.000V, 60.00V 0.1% + 2d 0.2% + 2d
60.00mV, 600.0V, 1000V 0.2% + 3d 0.3% + 3d
Input impedance: 10M, 110pF nominal
Ohms
RANGE 1) Accuracy
Model 887 Model 885
60.00 2) 0.5% + 5d 0.6% + 5d
600.0 0.2% + 3d 0.3% + 3d
6.000k, 60.00k 0.2% + 2d 0.3% + 2d
600.0k 0.3% + 2d 0.4% + 2d
6.000M 3) 1% + 3d 1.5% + 3d
60.00M 4) 1.5% + 6d 5) 6) 2% + 6d 5) 6)
1)Open Circuit Voltage: 1.7VDC typical
2)Specified assumes input lead resistance been offset by REL or Shrt (short) feature
3)Constant Test Current: 0.2A Typical
4)Constant Test Current: 0.02A Typical
5)Add 1% @ >20M
6)Add 2% @ operation temperature >35oC
Audible Continuity Tester
Audible threshold: between 20 and 350
Response time: < 30ms
Diode Tester
Range Accuracy Test Current (Typical)
Open Circuit Voltage
2.700V 1.5% + 4d 0.4mA < 2.8 VDC