BST CM3604 Operation Manual

3 1/2 DIGIT DIGITAL MULTIMETER WITH
TRANSISTOR, FREQUENCY AND CAPACITANCE
OPERATION MANUAL
1. SAFETY RULES
 This meter is designed and tested in accordance with EN publication 61010-1,
installation category II overvoltage 600V. and pollution degree 2.
 This meter has been tested according to the following EMC Directives

89/336/EEC (EMC of Nov., 1992, Electromagnetic Compatibility)

73/23/EEC Product safety law of Low Voltage Directive, EN61010-1 (04,93)
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, please 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.
Do not use the meter when the meter or test lead looks damaged, or when you

suspect that the meter is not operating properly.
 When using the probes, keep your fingers behind the finger guards on the probes.
 Disconnect the live test lead before disconnecting the common test lead.
 Make sure power is off before cutting, unsoldering, or breaking the circuit. Small
amount of current can be dangerous.
 Do not apply more than 600Vdc or 600Vac rms between a terminal and earth ground.
To avoid electrical shock, use CAUTION when working above 60Vdc or 25Vac rms.

Such voltages pose a shock hazard.
 Never make measurements with the battery cover or bottom case off.
 To avoid electrical shock or damage to the meter, do not exceed the input limits.
2. INTERNATIONAL SYMBOLS
Important information
see manual
AC
DC
3. SPECIFICATION
3.1 General Specifications
Display : 3 1/2 digit LCD with maximum reading of 1999.
Polarity : Automatic, (-) negative polarity indication.
Zero adjustment : Automatic.
: Only the massage "1" is displayed.
Over range indication
Power : Single, standard 9 volt battery NEDA 1604, JIS 006P,
IEC6F22.
Auto Power Off : Approximate 15 minutes. (Pressing twice the Power
Key to resume).
Dimension : 94 (W) x 205 (H) x 62 (D) mm.
Weight : Approx. 620 g (including battery and packaging).
3.2 Electrical Specifications
Accuracies are  (% of reading + no. of least significant digits) at 23C  5C, <75% RH.
Range Resolution Accuracy
200mV 0.1mV
DC Voltage 2V 0.001V
(0.8% + 1)
20V 0.01V
200V 0.1V
600V 1V
Range Resolution Accuracy
2V 0.001V
(0.8% + 3)
20V 0.01V
AC Voltage
200V 0.1V
(1.2% + 3)
600V 1V
On 2V range, if short nor open the two test leads, display reading is 10 digits, this
10 digits should not be subtracted from measurement results.
Range Resolution Accuracy
2mA 0.001mA
(0.8% + 3)
DC Current 20mA 0.01mA
(1.0% + 3)
200mA 0.1mA
(2.0% + 5)
20A 0.01A
Range Resolution Accuracy
(1.2% + 3)
20mA 0.01mA
AC Current
(1.5% + 3)
200mA 0.1mA
(3.0% + 5)
20A 0.01A
Range Resolution Accuracy
200 0.1
2k 0.001k
(0.8% + 2)
20k 0.01k
200k 0.1k
Resistance
2M 0.001M
(1.0% + 2)
20M 0.01M
(5.0% + 10)
200M* 0.1M
On 200MΩ range, if short the two test leads, display reading is 10 digits, this 10
digits should be subtracted from measurement results.
Range Resolution
2nF 0.001nF
20nF 0.01nF
200nF 0.1nF
Capacitance
2F 0.001F
20F 0.01F
On 2nF range, if Cx socket without DUT, display reading is 10 digits, this 10 digits
should not be subtracted from measurement results.
Range Resolution
Frequency 2kHz 0.001kHz
(1.5% + 5)
20kHz 0.01kHz
Diode
Continuity
Ground
Double insulation
Overload
Input Impedance
Protection
250V DC/AC rms
10M
600V DC/AC rms
Input Impedance
Freq. Response
10M
Overload
40-400Hz Protection
600V DC/AC rms
Volt. drop
Overload
Protection
Fast 200mA/250V
200mV
Fused
15sec. Max. Unfused
Volt. Freq.
Overload Protection
drop Response
Fast 200mA/250V
200mV 40-400Hz Fused
15sec. Max. Unfused
Open circuit volt.
Overload
<0.7V
Protection
250VDC/AC rms
<30sec
<3V
Accuracy Test Freq.
(2.5% + 5)
400Hz
Accuracy
Overload Protection
Vmin > 150mV
250VDC/AC rms <30sec
Vmax < 10V
Test voltage Test current
Approx. 2.8V Approx. 1mA
Range Test current
Buzzer sounds when
Approx.
resistance value
≤ 60
Transistor Range hFE value
Test hFE 0-1000
4. PANEL DESCRIPTIONS
1) 3 1/2 digits LCD display
2) Power Key
3) Function selector
4) Rubber Holster
5) Hold Key
6) Transistor socket
7) Input and common socket
8) Capacitor socket
5. OPERATION
!
WARNING
1) When measuring voltage ensure that the instrument is not connected or switched to a
current or resistance or temperature or to the diode check/continuity 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) When conducting current measurements ensure that the circuit is not "live" before
opening it in order to connect the test leads.
5) Before conducting resistance measurements or continuity / diode test, ensure that the
circuit under test is de-energised.
6) Always ensure that the correct function and range is selected. If in doubt about the
correct range, starts with the highest and works downwards.
7) 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.
8) Ensure that the test leads and probes are in good condition with no damage to the
insulation.
9) Take care not to exceed the over-load limits as given in the specifications.
10) Fuse for replacement must be of the correct type and rating.
5.1 DC and AC Voltage measurement
1) Connect the black test lead to the "COM" socket and red test lead to the "
V
2) Set the function selector to " " or "
3) Connect the test leads across the source or loads under measurement.
5.2 DC Current measurement
1) Connect the black test lead to the "COM" socket and red test lead to the "
measurement up to 200mA.
2) Set the function selector to desired resistance range "
3) Connect the test leads in series with the current source to be measured.
4) For current measurement from 200mA to 20A (Unfused) follow generally the above
procedure but connect the red test lead to "20A" socket.
5.3 AC Current measurement
1) Connect the black test lead to the "COM" socket and red test lead to the "
measurement up to 200mA.
2) Set the function selector to desired resistance range "
3) Connect the test leads in series with the current source to be measured.
4) For current measurement from 200mA to 20A (Unfused) follow generally the above
procedure but connect the red test lead to "20A" socket.
5.4 Resistance measurement
1) Connect the black test lead to the "COM" socket and red test lead to the "
2) Set the function selector to desired resistance range  position
3) Connect the leads across the circuit to be tested.
!
CAUTION: Ensure that the circuit to be tested is "dead".
Maximum input over-load : 250V rms < 30sec.
5.5 Diode test
1) Connect the black test lead to the "COM" socket and red test lead to the "
2) Set the function selector to (same as
3) Connect the black and red test leads to the cathode (-) and anode (+) ends of the diode
to be tested respectively.
4) Read the forward voltage drop (junction) value from the display. If reverse connected the
test leads to diode, display shows over-load.
5.6 Continuity test
1) Connect the black test lead to the "COM" socket and red test lead to the "
2) Set the function selector to (same as
3) Connect the leads across the circuit to be tested, if the resistance less than or equal to
approx. 60, buzzer will be activated.
! CAUTION: Ensure that the circuit to be tested is "dead".
Maximum input over-load : 250V rms < 30sec.
5.7 Transistor hFE test
1) Set the function selector to "hFE" position.
2) Determine whether the transistor is of NPN or PNP type and locate the E, B and C leads.
insert the leads into the proper holes in the socket "
3) The display will read the approximate hFE value at the test condition of base current 10μ
Open circuit Volt.
2.8V
Open circuit Volt.
2.8V
1.0mA
Test volt.(Vce)
Approx. 2.8V
1
2
POWER HOLD
200k
2M 20k
20M 2k
200M
200
V
200mV
hFE
2V

20 F 20V
 200V
2 F
3 600V
200nF
20nF 600V
2nF
200V
A
2mA
20V
20mA
2V
V
A 200mA 2k
Hz
20A 20k
20A 200mA 20mA
8
NPN
PNP
Cx
600V
MAX
mA
20A V COM
kHz
MAX CAT II
200mA MAX 600V
FUSED
20A 15 sec. MAX
UNFUSED
" position to measure DCV or ACV.
A
" position.
A
" position.
) position.
) position.
"
N P N
on the front panel.
P N P
Overload
Protection
250VDC/AC rms
<30sec
Base current
Approx. 10μA
4
5
6
7
" socket.
mA " socket for
mA " socket for
" socket.
" socket.
" socket.