Brymen BM905s User manual

USER'S
MANUAL
BM905s
BM906s
BM907s
Versatile
Multimeters

1
1) SAFETY
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.
This manual contains information and warnings that must be followed for operating the
instrument safely and maintaining the instrument in a safe operating condition. If the
instrument is used in a manner not specified by the manufacturer, the protection
provided by the instrument may be impaired. The meter is intended only for indoor use.
The meter protection rating, against the users, is double insulation per
IEC/UL/EN61010-1 Ed. 3.0, IEC/EN61010-2-030 Ed. 1.0, IEC/EN61010-2-033 Ed. 1.0,
IEC/UL/EN61010-031 Ed. 1.1 and CAN/CSA-C22.2 No. 61010-1-12 Ed. 3.0 to
Category II 1000 Volts, CAT III 600Volts and CAT IV 300Volts AC & DC.
Terminals (to COM) measurement category:
V / A / mAA: Category II 1000V, Category III 600V and Category IV 300V AC & DC.
Per IEC61010-1 2nd Ed. (2001) Measurement Category
Measurement Category IV (CAT IV) is for measurements performed at the source of
the low-voltage installation. Examples are electricity meters and measurements on
primary overcurrent protection devices and ripple control units.
Measurement Category III (CAT III) is for measurements performed in the building
installation. Examples are measurements on distribution boards, 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, for example,
stationary motors with permanent connection to the fixed installation.
Measurement Category II (CAT II) is for measurements performed on circuits directly
connected to the low voltage installation. Examples are measurements on household
appliances, portable tools and similar equipment.

2
WARNING
To reduce the risk of fire or electric shock, do not expose this product to rain or
moisture. To avoid electrical shock hazard, observe the proper safety precautions
when working with voltages above 60 VDC or 30 VAC rms. These voltage levels pose
a potential shock hazard to the user. Do not touch test lead tips or the circuit being
tested while power is applied to the circuit being measured. Keep your fingers behind
the finger guards of the test leads during measurement. Inspect test leads, connectors,
and probes for damaged insulation or exposed metal before using the instrument. If
any defects are found, replace them immediately. Do not measure any current that
exceeds the current rating of the protection fuse(s). Do not attempt a current
measurement to any circuit where the open circuit voltage is above the protection
fuse(s) voltage rating(s). Suspected open circuit voltage should be checked with
voltage functions. Never attempt a voltage measurement with the test lead inserted into
the A/mA or A input jack. Only replace the blown fuse(s) with the proper rating as
specified in this manual. Only use the test lead provided with the equipment or UL
Listed Probe Assembly.
CAUTION
Disconnect the test leads from the test points before changing functions. Always set
the instrument to the highest range and work downward for an unknown value when
using manual ranging mode.
INTERNATIONAL ELECTRICAL SYMBOLS
! Caution ! Refer to the explanation in this Manual
Caution ! Risk of electric shock
Earth (Ground)
Double Insulation or Reinforced insulation
Fuse
AC--Alternating Current
DC--Direct Current
2) CENELEC DIRECTIVES
The instruments conform to CENELEC Low-voltage directive 2006/95/EC and
Electromagnetic compatibility directive 2004/108/EC

3
3) PRODUCT DESCRIPTION
This user's manual uses only representative model for illustrations. Please refer
specification details for function availability to each model.
1) 3-5/6 digits 6000
counts + 999 counts
dual display LCD
2) Push-buttons for
special functions &
features
3) Selector to turn the
Power On or Off and
select a function
4) Input Jack (+) for
10A (20A for 30sec)
current function
5) Input Jack (+) for all
functions EXCEPT
current (  A, mA, A)
functions
6) Common (Ground
reference) Input Jack
(-) for all functions
7) Input Jack (+) for
milli-amp and
micro-amp functions

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.
VFD-ACV +Hz & VFD-Hz (Line Level)
Function defaults at VFD-ACV +Hz. By default, voltage is set at 600V & 1000V two
auto-ranges to best cope with most Variable Frequency Drives (VFD) measurements.
High noise-rejection frequency measurement algorithm and Low-pass filter circuit are
permanently bundled with all the voltage and frequency function-ranges within this
rotary-switch position. Press the RANGE button momentarily to select other ranges
only when needed.
Hz Input sensitivity varies automatically with voltage range selected. 6V range has the
highest and 1000V range has the lowest. Press SELECT button momentarily toggles to
higher resolution VFD-Hz in main display. The display shows the selected voltage
range for about one second before displaying Hz readings. Pressing the RANGE
button momentarily repeatedly to display and select any other voltage range. If the Hz
reading becomes unstable, select higher voltage range to avoid electrical noise. If the
reading shows zero, select lower voltage range for better sensitivity.

5
ACV +Hz & Hz (Line Level)
All the voltage and frequency function-ranges within this rotary-switch position are set
at regular frequency response without employing LPF. Function defaults at ACV +Hz. Hz
Input sensitivity varies automatically with voltage range selected. 6V range has the
highest and 1000V range has the lowest. Press SELECT button momentarily toggles to
higher resolution Hz in main display. The display shows the selected voltage range for
about one second before displaying Hz readings. Pressing the RANGE button
momentarily repeatedly to display and select any other voltage range. If the Hz reading
becomes unstable, select higher voltage range to avoid electrical noise. If the reading
shows zero, select lower voltage range for better sensitivity.
DCmV, ACmV +Hz & Hz (Logic Level)
Function defaults at DCmV. Press the SELECT button momentarily to select the
subject functions in sequence. Hz (Logic Level) is set at the highest available sensitivity
for logic level frequency measurements.

6
DCV
Turn rotary switch to DCV function position directly.

7
 Resistance, Continuity
Defaults at . Press SELECT button momentarily to select Continuity function
which is convenient for checking wiring connections and operation of switches. A
continuous beep tone indicates a complete wire.
CAUTION
Using Resistance, Continuity, Diode or Capacitance 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 measurement
reading.
Capacitance
Defaults at . Press SELECT button momentarily 2 times to select Capacitance
function. Relative zero mode can be used to zero out the parasitic capacitance of
the leads and the internal protection circuitry of the meter when measuring low
capacitance in the order of Pico Farad (pF).
CAUTION
Discharge capacitors before making any measurement. Large value capacitors should
be discharged through an appropriate resistance load

8
Diode test
Defaults at . Press SELECT button momentarily 3 times to select Diode test
function. 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).
Temperature (Model 906s & 907s only)
Defaults at oC. Press SELECT button momentarily to select oF function.
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
Electric Field EF-Detection
Model 905 defaults at E.F. function. Models 906s & 907s default at oC. Press SELECT
button momentarily 2 times to select E.F. function. The meter displays “E.F.” when it is
ready. Signal strength is indicated as a series of bar-graph segments on the display
plus variable beep tones.
●Non-Contact EF-Detection: An antenna is located along the top end of the meter,
which detects electric field surrounding current-carrying conductors. It is ideal for
tracing live wiring connections, locating wiring breakage and to distinguish between live
or earth connections.
●Probe-Contact EF-Detection: For more precise indication of live wires, such as
distinguishing between live and ground connections, use the Red (+) test probe for
direct contact measurements.
A, mA, and A Current functions
Function defaults DC. Press SELECT button momentarily to select AC +Hz. Hz Input
sensitivity varies automatically with current range selected. 600A range has the
highest and 10A range has the lowest. Press SELECT button momentarily further
select higher resolution Hz in main display. The display shows the selected current
range for about one second before displaying Hz readings. Pressing the RANGE
button momentarily repeatedly to display and select any other current range. If the Hz

10
reading becomes unstable, select higher current range to avoid electrical noise. If
the reading shows zero, select lower current range for better sensitivity.
CAUTION
When measuring a 3-phase system, special attention should be taken to the
phase-to-phase voltage which is significantly higher than the phase-to-earth voltage.
To avoid exceeding the voltage rating of the protection fuse(s) accidentally, always
consider the phase-to-phase voltage as the working voltage for the protection fuse(s).
5ms CREST-MAX capture mode
Press 5ms-MAX (HOLD) button for 1 second or more to activate CREST-MAX
capture (Instantaneous Peak-Hold) mode to capture signal peak of voltage or current in
duration as short as 5ms. The LCD “C” & “MAX” turn on. Press the button momentarily
again can toggle the combination use of HOLD feature. Press the button for 1 second
or more to exit CREST-MAX capture mode. Auto-ranging and Auto-Power-Off are
disabled automatically in this mode.
Backlighted LCD display (Model 907s only)
Press the SELECT button for 1 second or more to toggle the LCD backlight. The
backlight will also be turned off automatically after 32 seconds to extend battery life.
Hold
The HOLD feature freezes the display for later view. Press the HOLD button
momentarily to toggle the HOLD feature.

11
Relative Zero ( ) mode
Relative zero allows the user to offset the meter consecutive measurements with the
main display displaying reading as the reference value. Press the button
momentarily to toggle relative zero mode.
Manual or Auto-ranging
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 step through the ranges. Press and hold the button for 1
second or more to resume auto-ranging.
Note: Manual ranging feature is not available in Hz and functions.
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.
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 A, mA, or A input jacks when any
other function (like voltage function) is selected.
Auto-Power-Off (APO)
The Auto-Power-Off (APO) mode turns the meter off automatically to extend battery life
after approximately 34 minutes of no rotary switch or push button operations. To wake
up the meter from APO, press the SELECT 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 (APO) feature. Turn the rotary switch OFF and then back on to
resume.

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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.
Accuracy and 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. If self-diagnostic
message “C_Er” is being displayed while powering on, some meter ranges might be
largely out of specifications. To avoid mis-leading measurements, stop using the meter
and send it for re-calibration. Refer to the LIMITED WARRANTY section for obtaining
calibration, repairing or warranty service.
Cleaning and Storage
Periodically wipe the case with a damp cloth and mild detergent; do not use abrasives
or solvents. If the meter is not to be used for periods of longer than 60 days, remove
the batteries and store them separately
Trouble Shooting
If the instrument fails to operate, check batteries and test leads etc., and replace as
necessary. Double check operating procedure as described in this user’s manual.
If the instrument voltage-resistance input terminal has subjected to high voltage
transient (caused by lightning or switching surge to the system under test) by accident
or abnormal conditions of operation, the protective impedance components in series
might be blown off (become high impedance) like fuses to protect the user and the
instrument. Most measuring functions through this terminal will then be open circuit.
Such components should then be replaced by qualified technician. Refer to the
LIMITED WARRANTY section for obtaining warranty or repairing service.

13
Battery and Fuse replacement
Battery use:
Standard 1.5V AAA Size (NEDA 24A or IEC LR03) battery X 2
Fuses use:
Fuse (FS1) for AmA current input:
0.4A/1000V ac & dc, IR 30kA, F fuse, or better; Dimension: 6 x 32 mm
Fuse (FS2) for A current input:
11A/1000V ac & dc, IR 20kA, F fuse, or better; Dimension: 10 x 38 mm
Battery replacement for models with
battery access door:
Loosen the 2 screws from the
battery access door of the case
bottom. Lift the battery access door
and thus the battery compartment
up. Replace the battery. Re-fasten
the screws.
Fuse replacement (and also Battery
replacement for splash proof version
without battery access door):
Loosen the 4 screws from the case
bottom. Lift the end of the case
bottom nearest the input jacks until it
unsnaps from the case top. Replace
the blown fuse(s) and/or the battery.
Replace the case bottom, and
ensure that all the gaskets are
properly seated and the two snaps
on the case top (near the LCD side)
are engaged. Re-fasten the screws.

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6) GENERAL SPECIFICATIONS
Display: 3-5/6 digits 6000 counts + 3 digits 999 counts dual display LCD
Polarity: Automatic
Update Rate: 5 per second nominal;
Operating Temperature: 0C to 40C
Relative Humidity: Maximum relative humidity 80% for temperature up to 31C
decreasing linearly to 50% relative humidity at 40C
Pollution degree: 2
Storage Temperature: -20C to 60C, < 80% R.H. (with battery removed)
Altitude: Operating below 2000m
Temperature Coefficient (T.C.): nominal 0.15 x (specified accuracy)/ C @(0C --
18C or 28C -- 40C), or otherwise specified
Sensing: Average sensing for models 905s & 906s;True RMS for model 907s
Safety: Double insulation per IEC/UL/EN61010-1 Ed. 3.0, IEC/EN61010-2-030 Ed. 1.0,
IEC/EN61010-2-033 Ed. 1.0, IEC/UL/EN61010-031 Ed. 1.1 and CAN/CSA-C22.2 No.
61010-1-12 Ed. 3.0 to Category II 1000V, CAT III 600V and CAT IV 300V AC & DC
Transient Protection: 6kV (1.2/50s surge)
Terminals (to COM) Measurement Category:
V / A / mAA : Category II 1000V, CAT III 600V and CAT IV 300V AC & DC.
E.M.C. : Meets EN61326-1:2006 (EN55022, EN61000-3-2, EN61000-3-3,
EN61000-4-2, EN61000-4-3, EN61000-4-4, , EN61000-4-5, EN61000-4-6,
EN61000-4-8, EN61000-4-11)
In an RF field of 3V/m:
Capacitance function is not specified
Other function ranges:
Total Accuracy = Specified Accuracy + 100 digits
Performance above 3V/m is not specified
Overload Protection:
uA & mA : 0.4A/1000V DC/AC rms, IR 30kA, F fuse
A : 11A/1000V DC/AC rms, IR 20kA, F fuse
V : 1100V DC/AC rms
mV,  & others : 1000V DC/AC rms
Power Supply: 1.5V AAA Size battery X 2
Power Consumption: 5.4mA typical
Low Battery: Below approx. 2.4V
APO Timing: Idle for 34 minutes
APO Consumption: 10A typical
Dimension: L186mm X W87mm X H35.5mm; L198mm X W97mm X H55mm with

15
holster
Weight: 340 gm; 430 gm with holster
Accessories: Test leads (pair), holster, batteries installed, user's manual
Optional Accessories (Models 907s & 906s only): Bkp60 banana plug K-type
thermocouple, BKB32 banana plug to type-K socket plug adaptor
Special Features: VFD-V & VFD-Hz in Dual Display; Backlighted LCD (Model 907s
only); 5ms CREST-MAX Capture mode (Peak Hold); Auto-ranging Relative-Zero mode;
Display Hold; EF-Detection (NCV); Beep-JackTM input warning
Electrical Specifications
Accuracy is (% reading digits + number of digits) or otherwise specified, at 23C 
5C & less than 75% relative humidity.
True RMS model 907s AC voltage & AC current accuracies are specified from 5 % to
100 % of range or otherwise specified. Maximum Crest Factor <1.65:1 at full scale & <
3.30:1 at half scale, and with frequency components fall within the specified frequency
bandwidth for non-sinusoidal waveforms.
DC Voltage
RANGE Accuracy
60.00 mV 0.6%+3d
600.0mV, 0.3%+3d
6.000V, 1.2%+3d
60.00V 0.6%+3d
600.0V, 1000V 1.0%+3d
Input impedance: 10M, 50 pF nominal
AC Voltage
RANGE Accuracy
50Hz ~ 500Hz
60.00 mV 1.3% + 5d
600.0mV, 1.0% + 5d
6.000V 2.0% + 5d
60.00V 1.3% + 5d
600.0V, 1000V 2.0% + 5d
Input impedance: 10M, 50 pF nominal
VFD-Voltage (LPF-ACV)
RANGE Accuracy 1)
10.0Hz ~ 20.0Hz
6.000V, 60.00V, 600.0V,
1000V 3.5% +8d
20.0Hz ~ 200Hz
6.000V, 60.00V, 600.0V,
1000V 2.5% +8d
200Hz ~ 400Hz 2)
6.000V, 60.00V, 600.0V,
1000V 7.0% + 8d
Input impedance: 10M, 50 pF nominal
1)Not specified for fundamental frequency >
400Hz
2)Accuracy linearly decreases from 2.5% +
8d @ 200Hz to 7.0% + 8d @ 400Hz
Crest-MAX Capture (V & A only)
Accuracy: Specified accuracy plus 250

16
digits for changes > 5ms in duration
Ohm
RANGE 1) Accuracy
600.0, 0.8%+8d
6.000K, 60.00K,
600.0K 0.6%+4d
6.000M 1.5%+5d
60.00M 2.5%+5d
Open Circuit Voltage: 0.45VDC typical
Audible Continuity Tester
Audible Threshold:
between 10 and 120
Response time: <32ms
Capacitance
RANGE Accuracy 1)
60.00nF 2), 600.0nF,
6.000F, 2.0%+5d
60.00F, 600.0F 3) 3.5%+5d
3000F 3) 4.0%+5d
1)Accuracies with film capacitor or better
2)Accuracy unspecified
3)T.C.: 0.25 x specified accuracy / oC @ 0
~ 18 oC, 28 ~ 40 oC
Diode Tester
RANGE: 1.000V
Test Current: 0.2mA typical
Open Circuit Voltage: < 1.8VDC typical
DC Current
RANGE Accuracy
Burden
Voltage
600.0A 1.2% + 5d 0.25mV/A
6000A 1.0% + 3d 0.25mV/A
60.00mA 2.0% + 5d 4.0mV/mA
600.0mA 1.5% + 3d 4.0mV/mA
6.000A 1.5% + 5d 0.045V/A
9.00A 1) 1.2% + 3d 0.045V/A
1)10A continuous, >10A to 20A for 30
seconds max with 5 minutes cool down
interval
AC Current
RANGE Accuracy 1)
Burden
Voltage
50Hz -- 500Hz
600.0A 2.0% + 6d 0.25mV/A
6000A 1.5% + 5d 0.25mV/A
60.00mA 2.5% + 6d 4.0mV/mA
600.0mA 2.1% + 5d 4.0mV/mA
6.000A 2.0% + 6d 0.045V/A
9.00A 1) 1.8% + 5d 0.045V/A
1)10A continuous, >10A to 20A for 30
seconds max with 5 minutes cool down
interval
Temperature (Models 906s & 907s
only)
RANGE Accuracy
-50 oC ~ 1000 oC 1% + 3d
-58 oF ~ 1832 oF 1% + 6d
K type thermocouple range & accuracy
not included

17
Hz Line Level Frequency
(Dual Display)
AC Range
Sensitivity
(Sine RMS) Range
600mV 0.1V 10Hz~100kHz
6V 0.6V 10Hz~10kHz
60V 6V 10Hz~50kHz
600V 60V 10Hz~50kHz
1000V 600V 45Hz~10kHz
VFD 6V 0.6V~2.1V 1) 10Hz~400Hz
VFD 60V 6V~21V 1) 10Hz~400Hz
VFD 600V 60V~210V 1) 10Hz~400Hz
600A 60A 10Hz~10kHz
6000A 600A 10Hz~10kHz
60mA 6mA 10Hz~10kHz
600mA 60mA 10Hz~10kHz
6A 0.6A 20Hz~3kHz
9A 6A 20Hz~3kHz
Accuracy: 0.2%+4d
1)VFD sensitivity linearly decreases from
10% F.S. @ 200Hz to 35% F.S. @ 400Hz
Hz Logic Level Frequency
RANGE Accuracy 1)
5.000Hz ~ 300.0KHz 0.2%+4d
1)Accuracy is specified at < 20VAC rms
Input Signal : Square wave with duty
cycle > 40% & < 70%, or Sine wave
Sensitivity :
5Hz--20Hz : > 1Vrms Sine wave;
20Hz--300kHz : > 2.6Vp; or 1.9Vrms
Sine wave
Non-Contact EF-Detection
Typical Voltage Bar-
Graph
Indication
20V (tolerance: 10V ~ 36V) -
55V (tolerance: 23V ~ 83V) - -
110V (tolerance: 59V ~ 165V) - - -
220V (tolerance:124V ~ 330V) - - - -
440V (tolerance:250V & 1000V)
- - - - -
Indication: Bar-graph segments & audible
beep tones proportional to the field
strength
Detection Frequency: 50/60Hz
Detection Antenna: Top end of the meter
Probe-Contact EF-Detection: For more
precise indication of live wires, such as
distinguishing between live and ground
connections, use the Red (+) test probe
for direct contact measurement

18
- NOTE -

LIMITED WARRANTY
BRYMEN warrants to the original product purchaser that each product it manufactures
will be free from defects in material and workmanship under normal use and service
within a period of one year from the date of purchase. BRYMEN's warranty does not
apply to accessories, fuses, fusible resistors, spark gaps, batteries or any product
which, in BRYMEN's opinion, has been misused, altered, neglected, or damaged by
accident or abnormal conditions of operation or handling.
To obtain warranty service, contact your nearest BRYMEN authorized agent or send
the product, with proof of purchase and description of the difficulty, postage and
insurance prepaid, to BRYMEN TECHNOLOGY CORPORATION. BRYMEN assumes
no risk for damage in transit. BRYMEN will, at its option, repair or replace the
defective product free of charge. However, if BRYMEN determines that the failure
was caused by misused, altered, neglected, or damaged by accident or abnormal
conditions of operation or handling, you will be billed for the repair.
THIS WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ALL OTHER WARRANTIES,
EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED
WARRANTY OR MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
OR USE. BRYMEN WILL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT,
INCIDENTAL OR CONSEQUENTIAL DAMAGES.
BRYMEN TECHNOLOGY CORPORATION
TEL: [phone]
FAX: [phone]
http://www.brymen.com
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