5
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 BM27 and BM25 battery replacement:
*BM27 and BM25 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:
BM22: 3-3/4 digits 4000 counts; Updates 3 per second nominal
BM25 & BM27: 3-5/6 digits 6000 counts; Updates 5 per second nominal
Operating Temperature:
0
o
C ~ 40
o
C
Relative Humidity:
Maximum relative humidity 80% for temperature up to 31
o
C decreasing linearly to 50%
relative humidity at 40
o
C
Altitude:
Operating below 2000m
Storage Temperature:
-20
o
C ~ 60
o
C, < 80% R.H. (with battery removed)
Temperature Coefficient:
Nominal 0.15 x (specified accuracy)/
o
C @ (0
o
C ~ 18
o
C or 28
o
C ~ 40
o
C), or otherwise
specified
Sensing:
Average sensing
Pollution Degree:
2
Safety:
Meets IEC61010-1, UL61010B-1, CAN/CSA-C22.2 No. 1010.1-92
Transient Protection:
4kV lightning surge (1.2/50
µ
s)
6
Measurement Category:
BM22 & BM27: CAT II 600V and CAT III 300V
BM25: 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 ac 45d
Performance above 3V/m is not specified
Overload Protection:
BM22 & BM27: 600VDC & VAC rms
BM25: 450VDC & VAC rms
Low Battery:
Below approx. 2.4V
Power Supply:
3V standard button battery x 1 (IEC-CR2032; ANSI-NEDA-5004LC)
Power Consumption (typical):
BM22 & BM25: 2mA
BM27: 6mA for Voltage functions on Auto-V
Ω
position, and 2mA for other functions
APO Consumption (typical):
2.2
µ
A
APO Timing:
BM22: Idle for 30 minutes
BM25 & BM27: Idle for 3 minutes
Dimension / Weight:
L113mm x W53mm x H10.2mm / Approx. 78 gm
Special Features:
BM22: Data Hold, and 30ms MAX Hold
BM25 & BM27: AutoCheck
TM
(Automatic V &
Ω
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 number of digits) or otherwise specified @ 23
o
C +/- 5
o
C and less
than 75% R.H.
--------------------------------------------------------------------------- --------------------------------------------------------------------------
DC Voltage (BM25 & BM27)
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:
AutoCheck
TM
Lo-Z DCV: 160k
Ω
, 160pF nominal
BM27 Input Impedance:
AutoCheck
TM
Lo-Z DCV: 833k
Ω
(4.2k
Ω
when
displaying “Auto”), 90pF nominal
Hi-Z DCV: 5M
Ω
, 90pF nominal
NMRR: > 30dB @ 50Hz/60Hz
CMRR: > 100dB @ DC, 50Hz/60Hz; Rs=1k
Ω
DCV AutoCheck
TM
Threshold:
> +1.2VDC or < -0.6VDC nominal
1)
BM25 AutoCheck
TM
DCV only
2)
BM27 AutoCheck
TM
DCV only
3)
BM27 Hi-Z DCV only
DC Voltage (BM22)
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
Ω
Input Impedance: 10 M
Ω
, 30pF nominal; (1000M
Ω
for 400.0mV range)
7
AC Voltage (BM25 & BM27)
RANGE
Accuracy
50Hz -- 60Hz
6.000V, 60.00V, 450.0V
1)
,
600.0V
2)
1.5%+5d
CMRR: > 60dB @ DC to 60Hz, Rs=1k
Ω
BM25 Input Impedance:
AutoCheck
TM
Lo-Z ACV: 160k
Ω
, 160pF nominal
BM27 Input Impedance:
AutoCheckTM Lo-Z ACV: 833k
Ω
(4.2k
Ω
when
displaying “Auto”), 90pF nominal
Hi-Z ACV: 5M
Ω
, 90pF nominal
ACV AutoCheck
TM
Threshold:
> 1.5VAC (50/60Hz) nominal
1)
Range for BM25 only
2)
Range for BM27 only
AC Voltage (BM22)
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
Ω
, 30pF nominal
CMRR: > 60dB @ DC to 60Hz, Rs=1k
Ω
Capacitance (BM25 & BM27)
RANGE
1)
Accuracy
2)
100.0nF, 1000nF, 10.00
µ
F,
100.0
µ
F
3)
, 2000
µ
F
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 (BM22)
RANGE
1)
Accuracy
2)
500.0nF, 5.000
µ
F, 50.00
µ
F,
500.0
µ
F, 3000
µ
F
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 (BM25 & BM27)
RANGE
1)
Accuracy
600.0
Ω
2.0%+6d
2)
6.000k
Ω
1.2%+6d
2
)
60.00K
Ω
, 600.0K
Ω
1.0%+4d
6.000M
Ω
2.0%+4d
Open Circuit Voltage: 0.4VDC typical
1)
AutoCheck
TM
is for 6.000k
Ω
~ 6.000M
Ω
ranges;
600.0
Ω
is an independent range for BM27 only
2)
Add 40d to specified accuracy while reading is below
20% of range
Ohms (BM22)
RANGE
Accuracy
400.0
Ω
1.5%+6d
4.000K
Ω
, 40.00K
Ω
, 400.0K
Ω
1.0%+4d
4.000M
Ω
1.5%+4d
40.00M
Ω
2.5%+4d
Open Circuit Voltage: 0.4VDC typical
Hz Frequency (BM25
1)
& BM27
1) 2)
)
RANGE
Accuracy
Specified at
10.00Hz -- 30.00kHz
1) 2)
< 20V Sine-rms
10.00Hz -- 999.9Hz
2)
0.5%+4d
< 600V Sine-rms
Sensitivity (Sine-rms):
1)
Hz in Auto-V
Ω
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 (BM22)
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 (BM22 & BM27 only)
Test Current (Typical)
Open Circuit Voltage
0.25mA for BM22
0.48mA for BM27
< 1.6VDC
8
DC
µ
µ
µ
µ
A Current (BM27 only)
RANGE
Accuracy
Burden Voltage
400.0
µ
A
1.5%+3d
6mV/
µ
A
2000
µ
A
1.2%+3d
6mV/
µ
A
AC
µ
µ
µ
µ
A Current (BM27 only)
RANGE
Accuracy
Burden Voltage
50Hz -- 60Hz
400.0
µ
A
2.0%+3d
6mV/
µ
A
2000
µ
A
1.5%+3d
6mV/
µ
A
Audible Continuity Tester
Open Circuit Voltage: 0.4VDC typical
Audible Threshold:
BM25 & BM27: between 50
Ω
and 300
Ω
BM22: between 10
Ω
and 120
Ω
Non-Contact EF-Detection (BM25 & BM27)
Typical Voltage
Bar Graph Indication
15V to 55V
-
30V to 85V
- -
55V to 145V
- - -
85V to 190V
- - - -
above 120V
- - - - -
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
Guarantee
Elbro units are subject to strict quality controls. Nevertheless, we guarantee the unit against
functional faults for a period of 36 months (valid with receipt only).
•
Manufacturing and material faults will be corrected free of charge as long as the unit has
not been opened and has been returned to us.
•
Damage caused by mechanical influences or improper operation are excluded from
guarantee claims.
ELBRO LTD
•
Gewerbestrasse 4
•
P.O. Box 11
•
CH-8162 Steinmaur
•
Phone +41 44 854 73 00
Fax +41 44 854 73 01
•
e-mail:
•
www.elbro.com
P/N : 7M1C-0521-0007
