BST CM5092 User manual

3 3/4 Digits Auto Range DMM with Capacitance and Frequency
OPERATION MANUAL
1. SAFETY RULES
This meter is designed and tested in accordance with EN publication 61010-1, pollution
degree II and installation category (overvoltage category) III 600V.
This meter has been tested according to the following EC Directives
♦89/336/EEC Electromagnetic Compatibility, EN61326
♦73/23/EEC Product safety law of Low Voltage Directive, EN61010-1
This meter is designed to be indoor use at temperature 5°C to 40°C and altitude up to
2,000m.
To ensure that the meter is used safely, follow all safety and operating instructions in
this operation manual. If the meter is not used as described in this operation manual,
the safety features of this meter might be impaired.
2. INTERNATIONAL SYMBOLS
Important information
Diode
see manual
Continuity
AC
Ground
DC
Double insulation
3. SPECIFICATIONS
3.1 General Specifications
Display
:
3 3/4 digit LCD with max. reading of 3999.
Polarity
:
Automatic, (-) negative polarity indication.
Zero adjustment
:
Automatic.
Over range indication
:
Only the MSD “OL” is displayed.
Power
:
9V NEDA 1604, JIS 006P, IEC6F22 battery x 1
Dimension
:
194(L) x 93(W) x 39.4(H)mm.
Net Weight
:
Approx. 400g. (Including battery).
3.2 Electrical Specifications
Accuracies are ±(% of reading + number of least significant digits) at 23°C ±5°C, <75% RH.
DC Voltage
Range
Resolution
Accuracy
Input Impedance
Overload Protection
400mV
0.1mV
±(1.0%+2)
10MΩ
600V DC/AC rms
(< 30 sec.)
4V
0.001V
±(0.8%+1)
40V
0.01V
400V
0.1V
600V
1V
DC
Milli-Voltage
400mV 0.1mV ±(1.0%+2) 10MΩ
600V DC/AC rms
(< 30 sec.)
AC Voltage
Range Resolution
Accuracy
Freq.
Range
Input
Impedance
Overload
Protection
400mV*
0.1mV
±(2.0%+5d)
40~
400Hz
10MΩ600V DC/AC rms
(< 30 sec.)
4V
0.001V
±(1.2%+3d)
40V
0.01V
400V
0.1V
600V
1V
DC Current
Range
Resolution
Accuracy
Voltage Drop
Overload Protection
400uA
0.1uA
±(1.0% + 5d)
400mV Fuse 500mA/600V
4000uA
1uA
40mA
0.01mA
400mA
0.1mA
4A
0.001A
±(1.2% + 5d)
400mV
Fuse 10A/600V
10A
0.01A
±(1.5% + 5d)
200mV
Fuse 10A/600V
AC Current
Range Resolution
Accuracy
Voltage
Drop
Freq.
Range
Overload
Protection
400uA
0.1uA
±(1.2% + 5d)
400mV 40-400Hz Fuse
500mA/600V
4000uA
1uA
40mA
0.01mA
400mA
0.1mA
4A
0.001A
±(1.5% + 5d)
400mV
40-400Hz
Fuse 10A/600V
10A
0.01A
±(2.0% + 5d)
200mV
40-400Hz
Fuse 10A/600V
Resistance
Range Resolution
Accuracy
Open circuit
voltage
Overload Protection
400Ω
0.1Ω
±(1.0%+2d) <700mV 600V DC/AC rms
(< 30 sec.)
4 kΩ
0.001 kΩ
40 kΩ
0.01 kΩ
400 kΩ
0.1 kΩ
4 MΩ
0.001 MΩ
30 MΩ
0.01 MΩ
±(2.0%+5d)
Diode Test
Forward Volt. Drop Test Current
Open circuit
voltage
Overload Protection
0-1.000V
Approx.
0.6mA
Max. 1.5V
600V DC/AC rms
(< 30 sec.)
Continuity
Test
Test range Test Current
Open circuit
Voltage
Overload Protection
Buzzer sounds when
resistance value ≦50Ω
Approx. 1mA Approx. 0.5V
600V DC/AC rms
(< 30 sec.)
Capacitance
Range
Resolution
Accuracy
Overload Protection
50.00nF
0.01nF
±(3.0%+5d) 600V DC/AC rms
(< 30 sec.)
500.0nF
0.1nF
5.000uF
0.001uF
50.00uF
0.01uF
100uF
0.1uF(15sec)
±(3.5%+5d)
Frequency
Range
Resolution
Accuracy
Overload protection
5Hz
0.001Hz
±(1.5% + 5d)
Vpp = 600mV
600V DC/AC rms
(< 30 sec.)
50Hz
0.01Hz
500Hz
0.1Hz
5kHz
1Hz
50kHz
10Hz
100kHz
100Hz
*ACmV only available in manual-range
4. PANEL DESCRIPTIONS
1. LCD display
2. HOLD key
3. Multifunction key
4. RANGE key
5. Yellow key
6. Multifunction Selector
7. Current input terminal (10A)
8. Input terminal
9. Current input terminal (uA, mA)
10. Common input terminal
5. OPERATION
!
WARNING
1) When measuring voltage ensure that the instrument is not connected or switched to a
current, resistance, frequency, duty cycle, capacitance or diode/ continuity check range.
Always ensure that the correct terminals are used for the type of measurement to be
made.
2) Use extreme care when measuring voltage above 50V, especially from sources where
high energy exists.
3) Avoid making connections to “live” circuits whenever possible.
4) Before performing resistance, capacitance, diode or continuity test, ensure that the circuit
under test is de-energised.
5) Always ensure that the correct function and range is selected. If in doubt about the correct
range, start with the highest and work downwards.
6) Extreme care should be taken when using the instrument to conjunction with a current
transformer connected to the terminals. High voltage may be produced at the terminals if
an open circuit occurs.
7) Ensure that the test leads and prods are in good condition with no damage to the
insulation.
8) Take care not to exceed the overload limits as given in the specifications.
5.1 DC and AC voltage measurement
1. Connect the black test lead to the “COM” terminal and red test lead to the “
VHz %
”
terminal.
2. Set the multifunction selector to position and connect the test leads across the
source or load under measurement.
3. Using the yellow key to select AC voltage mode. The icon “~“ must be shown on the
display.
4. Connect the test leads across the source or load under measurement.
5.2 DC milli-voltage measurement
1. Connect the black test lead to the “COM” terminal and red test lead to the “
VHz %
”
terminal.
2. Set the multifunction selector to
mV
position and connect the test leads across the
source or load under measurement.
3. Connect the test leads across the source or load under measurement.
5.3 DC and AC current measurement
1. Connect the black test lead to the “COM” terminal and red test lead to the “
mAA
”
terminal for measurement up to 400mA.
2. Set the multifunction selector to desired current range position.
3. Connect the test leads in series with the current source to be measured.
4. Using the yellow key to select AC current mode. The icon “~“ must be shown on the
display.
5. For current measurement from 400mA to 10A (fused) follow generally the above
procedure but connect the red test lead to “10A” terminal.
!
CAUTION: Max. input over-load: 600V rms < 10sec.
5.4 Resistance measurement
1. Connect the black test lead to the “COM” terminal and red test lead to the “
VHz %
”
terminal.
2. Set the multifunction selector to position.
3. Connect the test leads across the circuit to be tested.
!
CAUTION: Ensure that the circuit to be tested is “dead”.
Max. input overload: 600V rms < 30sec.
5.5 Diode test
1. Connect the black test lead to the “COM” terminal and red test lead to the “
VHz %
”
terminal.
2. Set the multifunction selector to position.
3. Using the yellow key select a function. The icon “ “ must be shown on the display.
4. Push on the meter and connect the black and red test leads to the cathode (-) and anode
(+) ends of the diode to be tested respectively.
5. Read the forward voltage drop (junction) value from the display. When the forward biased
is open, the display will shows overload ‘.OL’ .
!
CAUTION: Max. input overload: 600V rms < 30sec.
5.6 Continuity test
1. Connect the black test lead to the “COM” terminal and red test lead to the “
VHz %
”
terminal.
2. Set the multifunction selector to position.
3. Using the select key select a function. The icon “ “ must be shown on the display.
4. Connect the test leads across the circuit to be tested, if the resistance less than 50Ω,
buzzer will be activated.
!
CAUTION: Max. input overload: 600V rms < 30sec.
5.7 Frequency measurement
1. Connect the black test lead to the “COM” terminal and red test lead to the “ ”
terminal.
2. Set the multifunction selector to Hz % position
!
!

3. Connect the test leads across the source under measurement.
CAUTION: Max. input over-load : 600V rms < 30sec.
5.8 Capacitance measurement
1. Connect the black test lead to the “COM” terminal and red test lead to the “ ”
terminal.
2. Set the multifunction selector to position.
3. When the reading does not display zero value, you can manually set the zero by pressing
multifunction key.
4. Connect the black and red test probes to the cathode (-) and anode (+) ends of the
capacitor to be tested respectively.
CAUTION: Ensure that the capacitor to be tested is “de-energized”.
Max. input over-load : 600V rms < 30sec.
5.9 Duty Cycle measurement
1. Connect the black test lead to the “COM” socket and red test lead to the “ ”socket.
2. Set the function selector to Hz % position.
3. Using the multifunction key select a % function. The icon “%“ must be shown on the
display.
4. Connect the test leads into the points of the circuit under test; the duty cycle ratio will be
displayed.
CAUTION: Max. input over-load : 600V rms < 30sec.
5.10 Auto power off
Automatic POWER OFF extends the life of the battery by turning the meter off automatically if
no rotary function switch is operated for about 45minutes. The power will be resumed by
pressing the HOLD key.
5.11 Data hold
The HOLD key is used to hold data during measurement and to switches ON and OFF the
display back light. Press the key once, reading will be held. Re-press the key reading will
resume active.
5.12 Manual range select
The RANGE key is used to select the auto ranging mode or manual ranging mode (except
DC mV, frequency, duty cycle and capacitance measurement). By pressing this key, the
instrument will go to manual ranging mode, the symbol “Auto” on the display will be disappear.
Press the key to select the desired range. Pressing the key more than 1 second, the
instrument will be going back to auto ranging mode.
6. MAINTENANCE
CAUTION
BEFORE ATTEMPTING BATTERY REMOVAL OR REPLACEMENT, DISCONNECT
TEST LEADS OR PROBES FROM ANY ENERGISED CIRCUITS TO AVOID SHOCK
HAZARD.
6.1 Fitting and replacing the battery
1. Ensure that the instrument is not connected to any external circuit, push the selector to
OFF position and remove the test leads from the terminals.
2. Remove four screws of the back case.
3. Replace the spent battery with the same type and rating.
4. Reinstate the back case, tighten and securing screw.
6.2 Cleaning
Periodically wipe the case with a soft damp cloth and mild household cleanser. Do not use
abrasives or solvents. Ensure that no water gets inside the equipment to prevent possible
shorts and damage.
7. ACCESSORIES
The accessories contained inside the packaging are the following:

Pair of test leads – P-B
Instruction manual
Carrying Case

Single, standard 9 volt battery NEDA
1604, JIS 006P, IEC6F22.
8. SERVICE
8.1 Warranty Conditions
This meter is guaranteed against any material fault or manufacturer’s defect, in accordance
with the general conditions of sale. During the warranty period (one year), faulty parts may be
replaced, with the manufacturer reserving the right to decide either to repair or replace the
product.
In the event of returning the meter to the after-sales service or to a regional branch, the
outward transport is payable by the customer. The delivery must be agreed in advance with
consignee.
For delivery indicate, by means of an enclosed note, as clear as possible, the reasons for
returning it. Use only the original packing.
Any damage caused by shipment using NOT the original packaging will be charged in any
case to the consignor.
The manufacturer will not be responsible for any damage to persons or things.
The warranty does not apply to the following cases:
Accessories and battery are not included in warranty.
Repairs following unsuitable use of the meter or by combining the latter with incompatible
meter or accessories.
Repairs resulting from incorrect shipping.
Repairs resulting from servicing carried out by a person not approved by the company.
Modifications to the meter without explicit authorisation from our technical department.
Adaptation to a particular application not provided for by the definition of the meter or by
the instruction manual.
The contents of this manual may not be reproduced in any form whatsoever without the
manufacturer’s authorization.
Our products are patented. The logotypes are registered. We reserve the right to
modify specifications and prices as part of technological developments which might
be necessary.
8.2 Service
If the meter should not work properly, before contacting the DEALER OR THE SERVICE
CENTRE, check the battery condition, the test leads, etc., Change them if necessary.
If the meter still does not work, check if your operating procedure agrees with the description
in this manual.
In the event of returning the meter, it must be re-sent to the after-sales service (at address or
to a regional branch), the outward transport is payable by the customer. The delivery must be
agreed in advance with consignee.
For delivery indicate the reasons for returning it. (By means of an enclosed note, as clear as
possible). Use only the original packing.
Any damage caused by delivery with NO original packaging will be charged in any case to the
consignor.
FOR TECHNICAL ASSISTANCE,
PLEASE CONTACT:
CM5092 (short form)
REV1JUL.07
!
Remarks: Due to our policy of continual product development, we reserve the
right to amend the specifications of the mentioned products without notice.
!
!