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BM22s, BM25s, BM25a & BM27s
USER'S MANUAL
1) PRODUCT DESCRIPTION
Note: Top of the line model is used as representative for illustration
purposes. Please refer to your respective model for function
availability.
1) LCD display
2) Rotary Selector to Select additional functions (Models 27s & 22s
only), and to turn the Power On or Off (Model 22s only). Model 25s
& 25a does not have a physical Rotary Selector.
3) Push-button to Select additional functions (all models), and to
switch the Power On or Off (Models 27s, 25s & 25a only)
4) Input for all functions, or otherwise specified. Red test lead for
positive (+) polarity and Black test lead for Ground reference (-)
2) 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. With test lead tip insulation CAP, the meter is protected, against the users, by 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 CAT III 300V & CAT II 600V (CAT II 450V for Model 25s &
25a). In case of removing test lead tip insulation CAP, to CAT II 600V (CAT II 450V for Model 25s & 25a) only.
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.
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 and probes for damaged insulation or exposed metal before using the
instrument. If any defects are found, replace them immediately.
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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
3) CENELEC DIRECTIVES
The instruments conform to CENELEC Low-voltage directive 2006/95/EC and Electromagnetic compatibility
directive 2004/108/EC
4) OPERATION
Note: All function operations described hereafter are via the Red test lead for positive (+) polarity and Black test
lead for Ground reference (-), or otherwise specified
Warning: Before and after hazardous voltage measurements, test the voltage function on a known source such as
line voltage to determine proper meter functioning.
4-1) FUNCTIONS IN “Auto V.” POSITION (Models 27s, 25s & 25a only)
-Quick Start (Models 27s, 25s & 25a only)
AutoCheckTM mode is the default function in “Auto V.” position. Press the SELECT button momentarily to select
and step through the functions: AutoCheckTM→Continuity→EF→ACV→DCV→→Hz→Cx→AutoCheckTM
-AutoCheckTM mode (Model 27s, 25s & 25a only)
This innovative AutoCheckTM feature automatically selects measurement function of DCV, ACV or Resistance ()
based on the input via the test leads.
●With no input, the meter displays “Auto” when it is ready.
●With no voltage signal but a resistance below 6M is present, the meter displays the resistance value. When
below 25 is present, the meter (Model 27s only) further gives a continuity beep tone.
●When a signal above the threshold of DC 1.2V or AC 1.5V up to the rated 600V (450V for Model 25s & 25a) is
present, the meter displays the appropriate voltage value in DC or AC, whichever larger in peak magnitude.
●Overload-Alert Feature: When above rated 600V (450V for Model 25s & 25a) is present, the meter displays
“OL” with a warning beep tone. Disconnect the test leads from the signal immediately to avoid hazards.
Note:
*Range-Lock Feature: When a measurement reading is being displayed in AutoCheckTM mode, press the
SELECT button momentarily 1 time can lock the function-range it was in. The LCD annunciator “ ” turns
off. Range-lock can speed up repetitive measurements. Press the SELECT button momentarily again to return to
AutoCheckTM mode.
*Hazardous-Alert: When making resistance measurements in AutoCheckTM mode, an unexpected display of
voltage readings alerts you that the part under test is still energized.
*AutoCheckTM nominal input impedances are slightly lower than that of common digital multimeters. They are, in
fact, more similar to that of most traditional analog multimeters. “LoZ” will display on the LCD to remind the users
in such cases. Although not likely, if such impedance might damage your circuits, use the common impedance (HiZ) voltage mode (Models 27s & 22s only) for making voltage measurements on them.
-Continuity, Audible With Symbolic Display (Models 27s, 25s & 25a only)
From AutoCheckTM with “Auto” being displayed, press the SELECT button momentarily 1 time to select Continuity
function. The meter displays a symbolic open-switch display “ ” when it is ready. Continuity is convenient for
checking wiring connections and operation of switches. A continuous beep tone with a symbolic closed-switch
display “ ” indicates a complete circuit. In noisy environments, it is helpful to “see” continuity measurements.
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-Electric Field EF-Detection (Models 27s, 25s & 25a only)
From AutoCheckTM with “Auto” being displayed, press the SELECT button momentarily 2 times to select EFDetection feature. The meter displays “EF” when it is ready. Signal strength is indicated as a series of bar-graph
segments on the display and variable beep tones.
●Non-Contact EF-Detection: An antenna is located at the top left corner of the meter, which detects electric field
surrounds 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 sockets, use the Red (+) test probe for direct contact measurements.
-V and of AutoCheckTM In Manual Selection (Models 27s, 25s & 25a only)
From AutoCheckTM with “Auto” being displayed, press the SELECT button momentarily 3 times to select ACV, 4
times to select DCV and 5 times to select Resistance () functions of AutoCheckTM. Such selected function
remains auto-ranging.
-Frequency And Capacitance (Models 27s, 25s & 25a only)
From AutoCheckTM with “Auto” being displayed, press the SELECT button momentarily 6 times to select
Frequency (Hz), 7 times to select Capacitance (F) functions and 8 times to return to AutoCheckTM mode.
Note:
*Unlike the Line Level Hz Frequency function (for Model 27s only) as stated, this (Common) Hz Frequency
function is set only at the highest input sensitivity mainly for measuring small electronic signals of below 20VAC
rms.
4-2) OTHER FUNCTIONS
-DCV, ACV & Line-Level Hz functions (Model 27s only)
Rotate the rotary selector to the V position selects common impedance (Hi-Z) voltage measurements. DCV is the
default function. Press SELECT button momentarily to select ACV. The AC annunciator “ ” turns on. Press
momentarily again to activate the Line-Level Hz function.
Note:
*Line-Level Hz input sensitivity varies automatically with ACV range selected when Line-Level Hz is selected. AC
6V range has the highest and AC 600V range has the lowest sensitivity. Measuring the signal in ACV function
WHILE selecting Line-Level Hz function in that ACV range automatically sets the most appropriate sensitivity for
higher voltage applications. This can avoid electrical noises as in 110/220V line voltage applications for example. If
the reading shows zero due to insufficient signal levels, select Line-Level Hz function BEFORE making
measurements (at AC 6V range) will set the highest sensitivity.
-Diode & 600 functions (Model 27s only)
Rotate the rotary selector to the /600 position.
Diode test is the default function. The reading shows the approximate voltage drop across the test leads. 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), and the meter will
give a long beep as continuity warning. 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).
Press SELECT button momentarily selects the lowest 600 range for lower resistance measurements. It is an
extended range to complement the AutoCheckTM Resistance () function.
-DC-A & AC-A Micro-Amp functions (Model 27s only)
Rotate the rotary selector to the A position. The display-reading unit is in A although there is no unit
annunciator on the display. DC-A is the default function. There is no annunciator for DC. Press SELECT button
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momentarily to select AC-A. The AC annunciator “ ” turns on. These ranges, like other functions, are
protected up to the maximum rated voltages of the meter.
-DCV & ACV functions (Model 22s only)
Rotate the rotary selector to the V position selects common impedance (Hi-Z) voltage measurements. Press
SELECT button momentarily toggles between DCV and ACV. Annunciator “ ” turns on for DC, and “ ” turns
on for AC.
-Resistance, Continuity, Diode & Capacitance functions (Model 22s only)
Rotate the rotary selector to the / / / position. Resistance “”is the default function.
Press SELECT button momentarily selects Continuity function. The Audible annunciator “ ” turns on. Continuity
is convenient for checking wiring connections and operation of switches. A continuous beep tone indicates a
complete circuit.
Press SELECT button momentarily AGAIN selects Diode test function. The annunciator “ ” turns on. The
reading shows the approximate voltage drop across the test leads. 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).
Press SELECT button momentarily AGAIN selects Capacitance function.
-Frequency function (Model 22s only)
Rotate the rotary selector to the Hz position selects Frequency function.
*Unlike the Line Level Hz Frequency function (for Model 27s only) as stated, this (Common) Hz Frequency
function is set only at the highest input sensitivity mainly for measuring small electronic signals of below 20VAC
rms.
4-3) OTHER FEATURES
-Power On & Off
For Models 27s, 25s & 25a, press and hold the SELECT button for 1 second and then release to turn the power
ON or OFF. Press and hold the SELECT button for approximately 6 seconds to master reset the system to the
default stage if in case the meter hangs up unexpectedly.
For Model 22s, rotate the rotary selector to turn the power ON or OFF.
-Auto Power Off
Models 27s, 25s & 25a turn off intelligently after approximately 3 minutes of idle measurement readings and no
button/switch activities. Model 22s turns off automatically after approximately 30 minutes of only no button/switch
activities.
-HOLD and 30ms MAX features (Model 22s only)
The Hold feature freezes the display for later viewing. Press the HOLD (MAX ) button momentarily to activate
or to exit the Hold feature.
The Max feature captures voltage signals that have durations as short as 30ms (milliseconds) within a single
range, and has automatic up range capability. This mode is available in DCV & ACV functions. Press the HOLD
(MAX ) button for 1 second or more to activate or to exit the Max feature.
-Auto-ranging
If the function selected has more than one range, the meter will auto-range to the best range and resolution. No
manual ranging is required.
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5) MAINTENANCE
WARNING
To avoid electrical shock, disconnect test leads from live circuits before opening the case. Do not operate with
open case.
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 battery and store it separately
Trouble Shooting
If the instrument fails to operate, check battery, leads, etc., and replace as necessary. Double check operating
procedure as described in this user’s manual
If the instrument voltage-resistance input has subjected to high voltage transient (mostly caused by lightning or
switching surge to your system) by accident or abnormal conditions of operation, the series fusible resistors will be
blown off (become high impedance) like fuses to protect the user and the instrument. Most measuring functions
through this input will then be open circuit. The series fusible resistors and the spark gaps should then be replaced
by qualified technician. Refer to the LIMITED WARRANTY section for obtaining warranty or repairing service.
Battery replacement
If the meter starts up with persistent resetting display or with low battery icon turns on, replace the battery
ASAP. The meter uses one 3V coin battery IEC-CR2032.
Before opening the case bottom, make sure the meter is switched off to avoid abrupt power reset to a running
meter system. Disconnect test leads from live circuits. Loosen the screw from the case bottom. Lift the end of the
case bottom nearest the input test leads until it unsnaps from the case top. Replace the battery. Observe battery
polarities with positive (+) faces up (towards the case bottom). Replace the case bottom, and ensure that the snap
on the case top (near the LCD side) is engaged. Re-fasten the screw.
Note for Models 27s, 25s & 25a battery replacement:
*Models 27s, 25s & 25a use micro-controller (like a computer) to run the meter system. WHEN THE METER IS
POWER-ON, intermittence battery power failure (fast intermittence battery contact interval in the order of
millisecond) may cause the meter reset/re-startup abnormally. Simply press and hold the SELECT button for
approximately 6 seconds to master reset the system if such a situation occurs.
6) SPECIFICATION
GENERAL SPECIFICATIONS
Display & Update Rate:
Model 22s: 3-3/4 digits 4000 counts; Updates 3 per second nominal
Models 25a, 25s & 27s: 3-5/6 digits 6000 counts; Updates 5 per second nominal
Operating Temperature: 0oC ~ 40oC
Relative Humidity: Maximum relative humidity 80% for temperature up to 31oC decreasing linearly to 50%
relative humidity at 40oC
Altitude: Operating below 2000m
Storage Temperature: -20oC ~ 60oC, < 80% R.H. (with battery removed)
Temperature Coefficient: Nominal 0.15 x (specified accuracy)/ oC @ (0oC ~ 18oC or 28oC ~ 40oC), or otherwise
specified
Sensing: Average sensing
Pollution Degree: 2
Safety: Meets 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
Transient Protection: 4kV lightning surge (1.2/50s)
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Measurement Category:
Models 22s & 27s: CAT II 600V and CAT III 300V
Model 25s & 25a: CAT II 450V and CAT III 300V
E.M.C.: Meets EN61326 (1997, 1998/A1), EN61000- 4-2 (1995), & EN61000-4-3 (1996)
In an RF Field of 3V/m:
Capacitance function is not specified
Other function ranges:
Total accuracy = Specified accuracy + 45d
Performance above 3V/m is not specified
Overload Protection:
Models 22s & 27s: 920VDC & VAC rms
Model 25s & 25a: 855VDC & VAC rms
Low Battery: Below approx. 2.4V
Power Supply: 3V standard button battery x 1 (IEC-CR2032; ANSI-NEDA-5004LC)
Power Consumption (typical):
Model 22s, 25s & 25a: 2mA
Model 27s: 6mA for Voltage functions on Auto-V position, and 2mA for other functions
APO Consumption (typical): 2.2A
APO Timing:
Model 22s: Idle for 30 minutes
Model 25a, 25s & 27s: Idle for 3 minutes
Dimension / Weight: L113mm x W53mm x H10.2mm / Approx. 78 gm
Special Features:
Model 22s: Data Hold, and 30ms MAX Hold
Model 25a, 25s & 27s: AutoCheckTM (Automatic V & Selection), and EF-Detection
Accessories: Battery installed, and User’s manual
Optional Accessories: BH-20R protective holster, and BSC-20 soft carrying pouch
Electrical Specification
Accuracy is given as +/- (% of reading digits + number of digits) or otherwise specified @ 23oC +/- 5oC and less
than 75% R.H.
----------------------------------------------------------------------- -----------------------------------------------------------------------DC Voltage (Models 25a, 25s & 27s)
RANGE
Accuracy
6.000V
0.5%+3d
60.00V
1.0%+5d
450.0V
1)
1.2%+5d
600.0V
2)
2.0%+5d
600.0V
3)
1.5%+5d
BM25 Input Impedance:
AutoCheckTM Lo-Z DCV: 160k, 160pF nominal
BM27 Input Impedance:
AutoCheckTM Lo-Z DCV: 833k (4.2k when
displaying “Auto”), 90pF nominal
Hi-Z DCV: 5M, 90pF nominal
NMRR: > 30dB @ 50Hz/60Hz
CMRR: > 100dB @ DC, 50Hz/60Hz; Rs=1k
DCV AutoCheckTM Threshold:
> +1.2VDC or < -0.6VDC nominal
1)
BM25 AutoCheckTM DCV only
2)
BM27 AutoCheckTM DCV only
3)
BM27 Hi-Z DCV only
DC Voltage (Model 22s)
RANGE
Accuracy
400.0mV
1.0%+2d
4.000V, 40.00V, 400.0V
2.0%+2d
600V
2.5%+4d
NMRR: > 50dB @ 50Hz/60Hz
CMRR: > 120dB @ DC, 50Hz/60Hz; Rs=1k
Input Impedance: 10 M, 30pF nominal; (1000M
for 400.0mV range)
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AC Voltage (Models 25a, 25s & 27s)
RANGE
Accuracy
50Hz -- 60Hz
6.000V, 60.00V, 450.0V
1)
,
600.0V
2)
1.5%+5d
CMRR: > 60dB @ DC to 60Hz, Rs=1k
BM25 Input Impedance:
AutoCheckTM Lo-Z ACV: 160k, 160pF nominal
BM27 Input Impedance:
AutoCheckTM Lo-Z ACV: 833k (4.2k when
displaying “Auto”), 90pF nominal
Hi-Z ACV: 5M, 90pF nominal
ACV AutoCheckTM Threshold:
> 1.5VAC (50/60Hz) nominal
1)
Range for BM25 only
2)
Range for BM27 only
AC Voltage (Model 22s)
RANGE
Accuracy
50Hz -- 60Hz
4.000V, 40.00V, 400.0V
2.0%+5d
60Hz -- 500Hz
4.000V, 40.00V, 400.0V
3.0%+5d
50Hz -- 500Hz
600V
3.5%+5d
Input Impedance: 10 M, 30pF nominal
CMRR: > 60dB @ DC to 60Hz, Rs=1k
Capacitance (Models 25a, 25s & 27s)
RANGE
1)
Accuracy
2)
100.0nF, 1000nF, 10.00F,
100.0F
3)
, 2000F
4)
3.5%+6d
5)
1)
Accuracy below 50nF is not specified
2)
Accuracies with film capacitor or better
3)
BM25 top range. Updates > 1 minute on large values
4)
BM27 only. Updates > 1 minute on large values
5)
Specified with battery voltage above 2.8V (half full
battery). Accuracy decreases gradually to 12% at
low battery warning voltage of approx 2.4V
Capacitance (Model 22s)
RANGE
1)
Accuracy
2)
500.0nF, 5.000F, 50.00F,
500.0F, 3000F
3)
3.5%+6d
4)
1)
Additional 50.00nF range accuracy is not specified.
2)
Accuracies with film capacitor or better.
3)
Updates > 1 minute on large values
4)
Specified with battery voltage above 2.8V (half full
battery). Accuracy decreases gradually to 12% at
low battery warning voltage of approx 2.4V
Ohms (Models 25a, 25s & 27s)
RANGE
1)
Accuracy
600.0
2.0%+6d
2)
6.000k
1.2%+6d 2)
60.00K, 600.0K
1.0%+4d
6.000M
2.0%+4d
Open Circuit Voltage: 0.4VDC typical
1)
AutoCheckTM is for 6.000k ~ 6.000M ranges;
600.0 is an independent range for BM27 only
2)
Add 40d to specified accuracy while reading is below
20% of range
Ohms (Model 22s)
RANGE
Accuracy
400.0
1.5%+6d
4.000K, 40.00K, 400.0K
1.0%+4d
4.000M
1.5%+4d
40.00M
2.5%+4d
Open Circuit Voltage: 0.4VDC typical
Hz Frequency (Models 25a
1)
, 25s
1)
& 27s
1) 2)
)
RANGE
Accuracy
Specified at
10.00Hz -- 30.00kHz
1) 2)
0.5%+4d
< 20V Sine-rms
10.00Hz -- 999.9Hz
2)
< 600V Sine-rms
Sensitivity (Sine-rms):
1)
Hz in Auto-V position: > 3V
2)
Line-level Hz in V position (BM27 only):
@ 6.000VAC range: > 3V
@ 60.00VAC range: > 6V
@ 600.0VAC range: > 60V
Hz Frequency (Model 22s)
RANGE
1)
Accuracy
5.000Hz -- 1.000MHz
0.5%+4d
1)
Specified at Input Voltage < 20VAC rms
Input Signal: Sine-wave, or Square-wave with duty
cycle > 40% & < 70%
Sensitivity (V-peak):
5Hz -- 100kHz : > 1.3Vp
100kHz -- 500kHz : > 2.2Vp
500kHz -- 1MHz : > 4.2Vp
Diode Tester (Models 25a, 25s & 27s only)
Test Current (Typical)
Open Circuit Voltage
0.25mA for BM22
0.48mA for BM27
< 1.6VDC
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DC A Current (Model 27s only)
RANGE
Accuracy
Burden Voltage
400.0A
1.5%+3d
6mV/A
2000A
1.2%+3d
6mV/A
AC A Current (Model 27s only)
RANGE
Accuracy
Burden Voltage
50Hz -- 60Hz
400.0A
2.0%+3d
6mV/A
2000A
1.5%+3d
6mV/A
Audible Continuity Tester
Open Circuit Voltage: 0.4VDC typical
Audible Threshold:
Models 25a, 25s & 27s: between 50 and 300
Model 22s: between 10 and 120
Non-Contact EF-Detection (Models 25a, 25s & 27s)
Threshold Voltage Between
Bar Graph
BM25
BM27
15V & 55V
20V & 80V
-
30V & 85V
45V & 125V
- -
45V & 145V
70V & 215V
- - -
75V & 190V
120V & 285V
- - - -
105V & up
170V & up
- - - - -
Indication: Bar graph segments & audible beep tones
proportional to the field strength
Detection Frequency: 50/60Hz
Detection Antenna: Top left corner of the meter
Probe-Contact EF-Detection: For more precise
indication of live wires, use the Red (+) probe for
direct contact measurements
------------------------------------------------------------------------- ------------------------------------------------------------------------
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:+886 2 2226 3396
FAX:+886 2 2225 0025
http://www.brymen.com
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