Brymen BM173D User manual

USER'S MANUAL
BM173D
BM175D
BM176D
AC Clamp-on
Multimeter Series

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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.
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
UL Listed Probe Assembly 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.
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.
This Clamp-on meter is designed to directly apply around or remove from uninsulated
hazardous live conductors. But still, individual protective equipment must be used if
hazardous live parts in the installation where measurement is to be carried out could
be accessible.

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CAUTION
Disconnect the meter from the test points before changing meter functions.
INTERNATIONAL 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)
3Three-phase Alternating Current
Application around and removal from hazardous live conductors is permitted
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 2006/95/EC,
Electromagnetic compatibility directive 2004/108/EC and RoHS directive 2011/65/EU.

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3) PRODUCT DESCRIPTION
This user's manual uses only representative model(s) for illustrations. Please refer
specification details for function availability to each model.
1) Antenna area for Non-Contact EF-
Detection
2) Jaw center indicator, at where best
current accuracy is specified
3) Rotary Selector to turn the power
ON/OFF and Select a function
4) 3-5/6 digits 6000 counts Dual numeric
LCD display
5) Additional (third) input Jack for Phase
Rotation function
6) Input Jack for all functions EXCEPT
non-invasive ACA current functions
7) Common (Ground reference) Input Jack
for all functions EXCEPT non-invasive
ACA current functions
8) Push-buttons for special functions &
features.
9) Jaw trigger for opening the clamp jaw
10) Hand/Finger Barrier to indicate the limits of safe access of the meter
11) Clamp Jaw for AC current magnetic field pick up
12) Additional center indicator for AmpTipTM Low-current function, at where best
AmpTipTM current accuracy is specified

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4) OPERATION
Introduction
To realize swift simultaneous dual measurements, the meter uses two Analog-to-
Digital Converters (Duo) for its Clamp-on ACA functions (Upper-display readings) as
well as its Rotary-switch functions (Lower-display readings) separately. Clamp-on
ACA functions turn ON whenever the Rotary-switch function is turned ON.
Regular & AmpTipTM Clamp-on ACA functions
Defaults at Regular ACA function where best accuracy is specified at the jaw center
area. Press button momentarily to toggle to AmpTipTM ACA function where best
accuracy is specified near the jaw tip area for low-current small conductors below
10mm in diameter.
WARNING: Do not use the meter to measure currents above the rated frequency
(400Hz). Circulating currents may cause the magnetic circuits of the Jaws reach a
hazardous temperature.
CAUTION: (Application and Removal of the Clamp-on Jaws) Press the jaw trigger and
clamp the jaws around conductor(s) of only one single pole of a circuit for load current
measurements. Make sure the jaws are completely closed, or else it will introduce
measurement errors. Enclosing conductor(s) of more than one pole of a circuit may
result in differential current (like identifying leakage current) measurements. Align the
conductor(s) to the Jaws center indicators (Regular or AmpTip™indicators where
applicable) as much as possible to get the best measuring accuracy. For removal,
press the jaw trigger and remove the jaws from the conductor(s).
CAUTION: Adjacent current-carrying devices such as transformers, motors and
conductor wires may affect measurement accuracy. Keep the jaws away from them as
much as possible to minimize influence.
ACV, Line-Level Hz & EF-Detection (NCV) functions
Inputs, other than that of EF-Detection as described later on, are made via the test
lead terminals COM/+. Defaults at ACV Function. Press SELECT button momentarily
to select ACV, Hz, EF-H & EF-L functions in sequence.
WARNING: Before and after hazardous voltage measurements, test the voltage
function on a known source such as line voltage to determine proper meter functioning.

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Note:
ACV and Hz functions are equipped with digital low-pass filter, and are capable of
dealing with VFD (Variable Frequency Drives) signals for fundamental readings. It also
improves ACV and Hz reading stability being in most noisy electrical environments.
EF-Detection function with EF-H & EF-L Sensitivities
The detected Electric Field strength is indicated as a series of bar-graph segments on
the display together with variable beep tones. Two user selectable sensitivities are
available. In High Sensitivity range, the meter displays “EF-H” when it is ready. It is set
to better detect lower voltage signals. If it is too sensitive for your applications, press
SELECT button momentarily to use the Lower Sensitivity “EF-L”range.

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●Non-Contact EF-Detection (NCV): An antenna is located along the top-right end of
the stationary clamp jaw, which detects electric field surrounding energized
conductors. It is ideal for tracing live wiring connections, locating wiring breakages and
to distinguish between live and earth connections.
●Probe-Contact EF-Detection: For more precise indication of live wires, such as
distinguishing between Live and Ground connections, use direct contact testing with
one single test-probe via an input terminal. The COM terminal (Black) has the best
sensitivity.

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DCV function
Inputs are made via the test lead terminals COM/+.
WARNING: Before and after hazardous voltage measurements, test the voltage
function on a known source such as line voltage to determine proper meter functioning.

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Resistance & Continuity functions
Inputs are made via the test lead terminals COM/+. Defaults at Resistance. Press
SELECT button momentarily to toggle between the subject functions.
Continuity function is convenient for checking wiring connections and operation of
switches. The meter provides Audible as well as Visible results. A continuous beep
tone, together with two flashing LCD icons and , indicates a complete wire. This
further improves ease of use especially in noisy working environments.
CAUTION
Using Resistance or Continuity function in a live circuit will produce false results and
may damage the meter. In many cases, the suspected component(s) must be
disconnected from the circuit to obtain an accurate measurement result.

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Capacitance & Diode functions
Inputs are made via the test lead terminals COM/+. Defaults at Capacitance. Press
SELECT button momentarily to toggle between the subject functions. (For Model
173D, Capacitance and Diode functions are located in different rotary switch positions.)
Note
When using 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).
CAUTION
1. Using Capacitance or Diode function in a live circuit will produce false results and
may damage the meter. In many cases, the suspected component(s) must be

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disconnected from the circuit to obtain an accurate measurement reading.
2. When using Capacitance function, discharge capacitor(s) before making any
measurements. Large value capacitors should be discharged through an appropriate
resistance load
Temperature function (Models 176D & 175D only)
Inputs are made via the test lead terminals COM/+. Press SELECT button momentarily
to toggle between oC(Celsius) and oF(Fahrenheit).
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 type-K standard mini plug temperature
probes.

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DCA Current function (Models 176D & 175D only)
Inputs are made via the test lead terminals COM/+.
Application Notes on Flame Sensors:
The DCAfunction is designed especially for HVAC/R flame sensor applications. The
0.1A resolution is useful for identifying the minute current changes in flame detector
applications. Flame signal current check should indicate steady flame signal of at least
2A for a rectification type, or 1.5A for an ultraviolet type (8A for self checking
systems). If a flame signal current with inadequate strength or fluctuation beyond 10%,
check the following to avoid the risk of unwanted flame relay dropout:
For gas or oil flames (Minipeeper):
Low supply voltage
Detector location
Defective detector wiring
Dirty viewing windows
Faulty Minipeeper
For oil flames (Photocell):
Detector location & wiring
Smoky flame or poorly adjusted air shutter
Faulty Photocell
Temperature over 165 oF (74 oC) at photocell
For gas flames (Flame Rod):
Ignition interference (A flame signal current difference with the ignition both on and
off greater than 0.5A indicates the presence of ignition interference)
Insufficient ground (must be at least 4 times the detector area)
Flame lifting off burner head (ground), or not continuously in contact with the flame
rod
Temperature in excess of 600 oF (316 oC) at the flame electrode insulator causing
short to ground.

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& 3-Phase Rotation function (Model 176D only)
Inputs are made via the test lead terminals L1/L2/L3. Phase Rotation directions are
indicated as symbolic movements by the LCD segments. Defaults at . Press
SELECT button momentarily toggles between and modes.
: Hi-sensitivity mode, which detects relatively low signal outputs generated from
motor spinning, for checking phase connections of Motors.
: Normal-sensitivity mode for identifying phase sequence of Electricity Supply.
CAUTION
Proper Rotation detection relies on solid signal connection to all three test lead
terminals simultaneously. Any single disconnection will lead to detection failure and
may produce false indication. To verify signal connection and hence proper meter
indication, swap any two connects (to the meter) to check for meter indication of
reverse movement

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Using the Hi-sensitivity mode for Motors:
Connect to the Motor as illustrated. Be sure the electricity supply is removed. From the
perspective of looking down the shaft of the motor, speed-spin it clockwise to generate
sufficient signal strength for proper meter detection. If the meter indicates a clockwise
movement, the motor leads connected to L1, L2 and L3 of the meter are L1, L2 and L3
(also known as R, S and T) respectively. If the meter indicates a counter-clockwise
movement, swap any two connects between the meter and motor. Then retest.
Using the Normal mode for Electricity Supply:
Connect to the Electricity Supply as illustrated. If the meter indicates a clockwise
movement, the phases connected to L1, L2 and L3 of the meter are L1, L2 and L3
(also known as R, S and T) respectively. If the meter indicates a counter-clockwise
movement, swap any two connects between the meter and phases. Then retest.
Connect the above mentioned L1, L2 and L3 of a Motor and that of the Electricity
Supply respectively should be able to get a clockwise motor movement.
Using the Complementary Beeper feature:
The Complementary Beeper feature can be selected in Power-up option. Press and
hold the button while turning the meter on to enable. When the LCD segments
indicate a clockwise movement, the beeper sounds a single long beep per segment
cycle. When the segments indicate a counter clockwise movement, the beeper sounds
3 short beeps per segment cycle.
Hold feature
Hold feature freezes the display for later view. LCD “ ” turns on. Press the HOLD
button momentarily to toggle the hold feature.
80ms PEAK-RMS mode for Clamp-on ACA functions
Press button for one second or more to toggle the PEAK-RMS mode. It
captures RMS values of inrush current in duration as short as 80ms. LCD annuciator
“P-RMS”turns on. Auto-Power-Off is disabled automatically in this mode.
LCD display Backlight
Press the SELECT button for 1 second or more to toggle the LCD backlight on/off. The
backlight will also be turned off automatically after 20 minutes to extend battery life.
Intelligent Auto-Power-Off (APO)

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The Auto-Power-off (APO) mode turns the meter off automatically to extend battery life
after approximately 32 minutes of no specified activities, where applicable:
1) Rotary switch or push button operations
2) Significant measuring readings of above 8.5% of ranges
3) Non-OL readings for Resistance, Continuity or Diode function
4) Non-zero readings for Hz function
5) Significant movement indication as in Phase Rotation functions
In other words, the meter will intelligently avoid entering the APO mode when it is in
normal measurements. To wake up the meter from APO, press the SELECT button
momentarily and release, 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
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 or battery door.
Do not operate with open case or battery door.
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 open fuses to protect the user and
the meter. Most measuring functions through this terminal might then be open circuit.
Such components should only be replaced by qualified technician. Refer to the
LIMITED WARRANTY section for obtaining warranty or repairing service.

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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. 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.
Battery replacement
The meter uses standard 1.5V AAA Size (IEC R03) battery X 2
Loosen the 2 captive screws from the battery cover case. Lift the battery cover case.
Replace the batteries. Replace battery cover case. Re-fasten the screws.

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GENERAL SPECIFICATIONS
Display: 3-5/6 digits 6000 counts; dual display
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: nominal 0.15 x (specified accuracy)/ C @(0C -- 18C or
28C -- 40C), or otherwise specified
Sensing: True RMS
Safety: Double insulation per UL/IEC/EN61010-1 Ed. 3.0, CAN/CSA C22.2 No. 61010-
1 Ed. 3.0, UL/IEC/EN61010-2-032 Ed. 3.0, UL/IEC/EN61010-2-033 Ed. 1.0 to CAT III
600V and CAT IV 300V AC & DC
Transient Protection: 6.0kV (1.2/50s surge)
Overload Protections:
Clamp-on jaws: 600A rms continuous
“ + ” & COM Terminals (all other functions): 600VDC/VAC rms
E.M.C.: Meets EN61326-1:2013
Temperature function at 80MHz ~ 150MHz:
In an RF field of 1V/m:
Total Accuracy = Specified Accuracy + 25 digits
Other functions:
In an RF field of 3V/m:
Total Accuracy = Specified Accuracy + 20 digits
Power Supply: 1.5V AAA Size battery X 2
Power Consumption: 6.2mA typical
Low Battery Indication:
Below approx. 2.85V for Capacitance & Hz
Below approx. 2.5V for other functions
APO Timing: Idle for 32 minutes approx.
APO Consumption: 5A typical
Dimension (LxWxH): 217 x 76 x 37mm
Weight: 186gm
Jaw opening & Conductor diameter : 30mm max

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Accessories: Test lead set, User's manual, Soft carrying pouch, Bkp60 banana plug
K-type thermocouple (Models 175D & 176D only), Alligator Clip set (Model 176D only)
Optional Purchase Accessories: BKB32 banana plug to type-K socket plug adaptor
(Models 175D & 176D only)
Special Features: AmpTipTM low-current range; Display Hold; EF-Detection (NCV);
Backlighted LCD; 80ms Peak-RMS mode for inrush current; 3-Phase Rotation
detection (Models 176D only)
Electrical Specifications
Accuracy is (% reading digits + number of digits) or otherwise specified, at 23C 
5C.
Maximum Crest Factor < 2.5 : 1 at full scale & < 5 : 1 at half scale or otherwise
specified, and with frequency components within the specified frequency bandwidth for
non-sinusoidal waveforms.
DC Voltage
RANGE
Accuracy
600.0V
1.0% + 5d
Input Impedance: 10M, 100 pF nominal
AC Voltage (with Digital Low Pass Filter)
RANGE
Accuracy
50Hz ~ 60Hz
600.0V
1.0% + 5d
Input Impedance: 10M, 100 pF nominal
Ohm
RANGE
Accuracy
600.0, 6.000K, 60.00K
1.0% + 5d
600.0K1), 6000K2)
1.2% + 5d
Open Circuit Voltage: 1.7VDC typical
1)Test Current: 2A typical
2)Test Current: 0.2A typical

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Audible Continuity Tester
Audible Threshold: Between 10and 250
Response time: 32ms approx.
Capacitance
RANGE
Accuracy 1)
200.0F, 2500F
2.0% + 4d
1)Accuracies with film capacitor or better
Diode Tester
RANGE
Accuracy
3.000V
1.5% + 5d
Test Current: 0.3mA typical
Open Circuit Voltage: < 3.5VDC typical
DCA (Models 175D & 176D only)
RANGE
Accuracy
Burden Voltage
200.0A, 2000A
1.0% + 5d
3.5mV/A
Temperature (Models 175D & 176D only)
RANGE
Accuracy 1) 2)
-40.0 oC ~ 99.9 oC
1.0% + 0.8oC
100 oC ~ 400 oC
1.0% + 1oC
-40.0 oF ~ 99.9 oF
1.0% + 1.5oF
100 oF ~752 oF
1.0% + 2oF
1)K-type thermocouple range & accuracy not included
2)Accuracies assume meter interior has the same temperature of the ambient
(isothermal stage) for a correct junction voltage compensation. Allow enough time to
reach the isothermal stage for a significant change of ambient temperature. It can take
up to an hour for changes > 5°C.

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AmpTipTM Clamp-on ACA
RANGE
Accuracy 1) 2) 3) 4)
50Hz ~ 60Hz
60.00A
1.5% + 5d
1)Induced error from adjacent current-carrying conductor: <0.06A/A
2)Induced error from ACV measurement < 0.60A /kV @50/60Hz
3)Add 10d to the specified accuracy @ < 6A
4)Induced non-zero residual while beeper turns on: < 20d
Regular Clamp-on ACA
RANGE
Accuracy 1) 2) 3) 4)
50Hz ~ 100Hz
60.00A 5), 600.0A
1.8% + 5d
100Hz ~ 400Hz
60.00A 5), 600.0A
2.0% + 5d
1)Induced error from adjacent current-carrying conductor: <0.06A/A
2) Induced error from ACV measurement < 0.60A /kV @50/60Hz
3)Specified accuracy is for measurements made at the jaw center. When the conductor
is not positioned at the jaw center, add 2% to specified accuracy for position errors
4)Induced non-zero residual while beeper turns on: < 20d
5)Add 10d to specified accuracy @ < 6A
80ms PEAK-RMS for Clamp-on ACA functions
Response: 80ms to > 90% of specifications, and is specified from 2% of range.
Hz Line Level Frequency
Function
Sensitivity (Sine RMS) 1)
Range
600V
50V
5.00Hz ~ 999.9Hz
Accuracy: 1%+5d
1)DC-bias, if any, not more than 50% of Sine RMS