BST CM5092 Operation 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
!
see manual
AC
DC
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.
Range Resolution
400mV 0.1mV
4V 0.001V
DC Voltage
40V 0.01V
400V 0.1V
600V 1V
DC
400mV 0.1mV
Milli-Voltage
Range Resolution
400mV* 0.1mV
AC Voltage 4V 0.001V
40V 0.01V
400V 0.1V
600V 1V
Range Resolution
400uA 0.1uA
4000uA 1uA
40mA 0.01mA
DC Current
400mA 0.1mA
4A 0.001A
10A 0.01A
Range Resolution
400uA 0.1uA
4000uA 1uA
AC Current
40mA 0.01mA
400mA 0.1mA
4A 0.001A
10A 0.01A
Range Resolution
400Ω 0.1Ω
4 kΩ 0.001 kΩ
Resistance
40 kΩ 0.01 kΩ
400 kΩ 0.1 kΩ
4 MΩ 0.001 MΩ
30 MΩ 0.01 MΩ
Forward Volt. Drop
Diode Test
0-1.000V
Test range
Continuity
Test Buzzer sounds when
resistance value ≦50Ω
Range Resolution
50.00nF 0.01nF
500.0nF 0.1nF
Capacitance
5.000uF 0.001uF
50.00uF 0.01uF
100uF 0.1uF(15sec)
Range Resolution
5Hz 0.001Hz
50Hz 0.01Hz
Frequency 500Hz 0.1Hz
5kHz 1Hz
50kHz 10Hz
100kHz 100Hz
*ACmV only available in manual-range
Diode
Continuity
Ground
Double insulation
Accuracy Input Impedance Overload Protection
±(1.0%+2)
600V DC/AC rms
10MΩ
±(0.8%+1)
600V DC/AC rms
±(1.0%+2) 10MΩ
Freq. Input
Accuracy
Range Impedance
±(2.0%+5d)
40~ 600V DC/AC rms
10MΩ
400Hz
±(1.2%+3d)
Accuracy Voltage Drop Overload Protection
±(1.0% + 5d) 400mV Fuse 500mA/600V
400mV Fuse 10A/600V
±(1.2% + 5d)
200mV Fuse 10A/600V
±(1.5% + 5d)
Voltage Freq.
Accuracy
Drop Range
±(1.2% + 5d) 400mV 40-400Hz
400mV 40-400Hz Fuse 10A/600V
±(1.5% + 5d)
Fuse 10A/600V
±(2.0% + 5d) 200mV 40-400Hz
Open circuit
Accuracy Overload Protection
voltage
±(1.0%+2d) 600V DC/AC rms
<700mV
±(2.0%+5d)
Open circuit
Test Current Overload Protection
voltage
Approx. 600V DC/AC rms
Max. 1.5V
0.6mA
Open circuit
Test Current Overload Protection
Voltage
600V DC/AC rms
Approx. 1mA Approx. 0.5V
Accuracy Overload Protection
±(3.0%+5d) 600V DC/AC rms
(< 30 sec.)
±(3.5%+5d)
Accuracy Overload protection
±(1.5% + 5d) 600V DC/AC rms
Vpp = 600mV (< 30 sec.)
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
(< 30 sec.)
1. Connect the black test lead to the "COM" terminal and red test lead to the "
terminal.
2. Set the multifunction selector to
(< 30 sec.)
source or load under measurement.
Overload
3. Using the yellow key to select AC voltage mode. The icon "~" must be shown on the
Protection display.
4. Connect the test leads across the source or load under measurement.
5.2 DC milli-voltage measurement
(< 30 sec.)
1. Connect the black test lead to the "COM" terminal and red test lead to the "
terminal.
2. Set the multifunction selector to
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 "
terminal for measurement up to 400mA.
2. Set the multifunction selector to desired current range position.
Overload
3. Connect the test leads in series with the current source to be measured.
Protection
4. Using the yellow key to select AC current mode. The icon "~" must be shown on the
display.
Fuse
5. For current measurement from 400mA to 10A (fused) follow generally the above
500mA/600V
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 "
terminal.
2. Set the multifunction selector to
3. Connect the test leads across the circuit to be tested.
!
CAUTION:
(< 30 sec.)
5.5 Diode test
1. Connect the black test lead to the "COM" terminal and red test lead to the "
terminal.
(< 30 sec.) 2. Set the multifunction selector to
3. Using the yellow key select a
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
(< 30 sec.)
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 "
terminal.
2. Set the multifunction selector to
3. Using the select key select a
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
!
position and connect the test leads across the
mV
position and connect the test leads across the
position.
Ensure that the circuit to be tested is "dead".
Max. input overload: 600V rms < 30sec.
position.
function. The icon " " must be shown on the display.
position.
function. The icon " " must be shown on the display.
V Hz %
"
V Hz %
"
A mA
"
V Hz %
"
V Hz %
"
V Hz %
"
"