General Technologies CT8030 User Manual
General Technologies Corp.
CT8030
Professional Automotive Digital Multimeter
1. SAFETY RULES
This meter is designed for indoor use at temperatures between 0°C to 40°C and
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altitudes up to 2,000m.
To ensure that the meter is used safely, follow all safety and operating instructions in
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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 if the meter or test leads look damaged ,or if you suspect that
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the meter is not operating properly.
When using the instrument, keep your ngers behind the nger guards on the plastic
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casing and probes.
Disconnect the live test lead before disconnecting the common test lead.
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Make sure power is off before cutting, desoldering, or breaking the circuit wires. Small
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amounts of current can be dangerous.
Do not apply more than 1000 VDC or 750V AC rms between a terminal and ground.
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To avoid electrical shock, use CAUTION when working above 60V DC or 25V AC rms.
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Such voltages pose a shock hazard.
Never make measurements with the battery cover off.
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To avoid electrical shock or damage to the meter, do not exceed the input limits.
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2. INTERNATIONAL SYMBOLS
Important information Dangerous Voltages
see manual Continuity
AC Ground
DC Double Insulation
3. TECHNICAL SPECIFICATIONS
3.1 General Specications
Display: LCD, 4¾ digits/40000 Counts (99999 for Hz
function) + 4 Digits/9999 Counts dual display
with 42 segments analog bargraph.
Polarity: Automatic, (-) negative polarity indication
Zero adjustment: Automatic
Sample rates
3¾ Digits: 5 times per Sec.
4¾ Digits: 1.25 times per Sec.
43 Seg. bar graph: 128 times per Sec
Over range indication: “
Operating Temperature: 0 to 35°C, 0 to 80% RH
0 to 50°C, 0 to 70% RH
Power Source: 9-volt battery type NEDA 1604, IEC6F22
Battery life: Approx. 70 hours. (w/ alkaline batteries)
Safety: Des igne d to co m ply wit h EN 6101 0-
E.M.C.: Meets EN55011 and EN582-1
Dimension: 7.32”x3.42”x1.39” or 186x87x35.5mm
without Holster
Weight: Approx. 13.8 Oz. or 390g (without Holster).
Accesories: User’s Manual, Test Leads, Back Probes,
OL” is displayed
1, UL3 111- 1, CSA C 22.2 No.1 010-1
and IEC1010-1 Installation category II,
Pollution degree 1
Alligator Clips, Protective Holster, Hard
Carriying Case, K-type Temperature Probe,
Inductive pick-up and 9V battery.
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3.2 Electrical Specications
Accuracies are ±(% of reading + number of least signicant digits) at 23°C
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±5°C, less than 75% RH. For DC/AC current measurement, the maximum
current of 10 A is for 30 Sec. with 5 min. cool down between measurements.
Function Range
40.00 mV
400.0 mV,
DC Voltage
AC Voltage
DC Current
AC Current
Resistance
Diode Test
Frequency
Multiport
Fuel
Injection
Single
Port Fuel
Injector
Tachometer
Dwell
4.000 mV,
40.00 V to
400.0 V
1000 V
40.00 mV
400.0 mV,
4.000 V,
40.00V,
400.0 V, 750V
40.00 mV
400.0 mV,
4.000 V,
40.00V,
400.0 V, 750V
40.00 mV
400.0 mV,
4.000 V,
40.00V,
400.0 V, 750V
4000 mA
10.00 A
4000 mA
10.00 A
4000 mA
10.00 A
4000 mA
10.00 A
40.00Ω
400.0Ω,
4.000 kΩ,
40.00 kΩ
400.00 kΩ
4.000 MΩ
40.00 MΩ
2.000 V
99.999 Hz to
20.000 kHz
0.05 - 250 mS
0.0 - 100 %
0.05 - 250 mS
0.0 - 100 %
120-20000 RPM
60-10000 RPM
0.0º - 360.0º 1.2º/krpm+1
0.0º - 100.0º 0.04º/krpm/cyl +2
A c c u -
racy
0.8%+6
0.1%+2
0.1%+4
1%+10
0.8%+4
3.5%+10
2.5%+5
4%+10
3.6%+8
1.2%+6
0.8%+4
1.2%+6
1.0%+3
2.5%+10
1.2%+3
3.5%+10
1.5%+5
0.5%+40
0.15%+4
0.15%+2
0.3%+2
1.5%+3
- < 3.2 V Test Voltage 600 Vrms
0.001%+4
0.04%/krpm +2
0.04%/krpm/cyl +2
2 RPM
Input
I m p e d -
ance
10 M
Ω,
30 pF
nominal
10 M
Ω,
30 pF
nominal
(100pF
nominal in
40 mV and
400 mV
Ranges)
0.03 V/A Voltage Burden
0.03 V/A Voltage Burden
<1.3 V Test Voltage
(<3.3 V in 40
400
Ω range)
1, 2, 20 and 200 Vrms
Selectable threshold
0.05mS+1
0.05mS+1
R e -
marks
50~60Hz
40 Hz to
1 kHz
1 kHz to
2 kHz
Ω and
Selectable
+/- Slope,
and
Number of
Cylinders
RPM 4
RPM 2
1 to 12
Cyl.
Overload
Protection
600 Vrms
600 Vrms
Fuse
Protected
Fuse
Protected
600 Vrms
600 Vrms
600 Vrms
600 Vrms
600 Vrms
Audible Continuity Tester
+
-
RPM
4
RPM
2
RPM
2
RPM
4
Audible threshold : between 10Ω, and 60Ω.
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Response time: 200μs.
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O2 Sensor Tester
Application : For O2 Sensor dynamic test
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Main Display : Symbolic waveform display of O2 Sensor
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Mini display : Cross count per second parameter.
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Sweep Rate : 10 per second.
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Alternator tester
dynamic output.
A beep sound will alert the user on each
signicant cross count edge
4.2 Display Description
15. : These annunciators indicate trigger level status.
4.3 Measurement Procedures
CAUTION: Maximum Input Voltage is 750Vrms,do not exceed
this rating to avoid personal injuries or damage to the
instrument. The FUNCTION switch should be set to
the range you want to test before the operation.
CAUTION: Always ensure that the correct terminals are used for
the type of measurement to be made. Avoid making
connections to “live” circuits whenever possible.When
making current measurements ensure that the circuit
is not “live” before opening it in order to connect the
test leads.
4.3.1 DC/AC Voltage Measurement
Application : For quick go / no go test on alternators
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Threshold : The display indicates "bad" and the
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Fault Code Detector
Application : For blink type fault code detection
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Display : The display indicates a symbolic pulse and
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Threshold : 4.5VDC with selectable positive or negative
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DTC (Diagnostic Trouble Code) Decoder
Application : A replacement of the Impulse Counter Scan
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beeper turns on when the measured
ripple voltage is greater than 0.45VAC.
the beeper turns on when the blink code
pulse is detected.
pulse trigger (by ±Trigger button).
Tool as specified in the Mercedes-Benz
Diagnostic Trouble Code Reference Guide
to scan the DTC Code readout automatically
on the Mercedes-Benz car series.
4. OPERATION
4.1 Instrument Description
: Input Socket for all functions except Current and TACH
8-
functions.
16.
17.
18.
19. DATA : Main digital readings of data being measured.
20.
21.
22.
23.
24.
25.
: These annunciators indicate positive ( ) or negative
( ) Trigger Slope is selected.
: Negative polarity symbol.
:
annunciator indicates direct current (DC) is selected.
annunciator indicates alternating current (AC) is selected.
: This annunciator indicates Auto Power Off is enabled.
: This annunciator indicates Autoranging.
: Low Battery alert, replace the battery as soon as possible
to ensure accuracy.
: This annunciator indicates the Alternator tester function
is selected.
: This annunciator indicates data HOLD function is activated.
: This annunciator indicates the Record function is activated.
Set rotary switch to position.
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Default at DC. Press SELECT button momentarily to select AC,
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and press again to select
Insert red ( ) test lead into jack and black ( ) test lead into
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COM input jack.
Connect test leads to voltage source and observe the digital display
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for the readout.
Hz if required.
1- LCD Display: 4-3/4digit 40000 count 4 digits 9999 count dual display.
2-
3- : Pushbutton to select Auto/Manual ranging in most
4-
5- : Pushbutton. Press momentarily to turn on the display
6- Rotary Switch: Turns the power ON and OFF and selects
7-
: Pushbutton, press momentarily to select trigger levels,
or press and hold for 1 second to toggle between positive and
negative trigger slopes.
functions, or number of cylinders in Dwell function.
: Pushbutton to select relative zero and relative
percentage change.
backlight, or press and hold for 1 second to recall stored data.
measuring functions.
COM Input Socket: Common (Ground Reference) Input
connector for all functions except TACH function.
mA A/RPM : Input Jack ( ) for current function, and
9-
ground reference (
RPM : INPUT JACK ( ) FOR RPM FUNCTION
10-
11-
12- : Pushbutton. press momentarily to select secondary
13- : Pushbutton. press momentarily to toggle between
14- : Pushbutton. press momentarily to toggle between
Page 2
: Pushbutton. Press momentarily to activate hold, or
press and hold for 1 second to store the data displayed for
later recall
functions, or press and hold for 1 second to erase all stored
datas
40,000 and 4000 counts modes, or press and hold for 1
second to activate record function
and
second to activate Crest function
) input Jack for RPM function.
in RPM function, or press and hold for 1
26.
: This annunciator indicates the Crest function is activated.
27.
28.
29.
30.
31.
: This annunciator indicates the Fault Code Detector
function is activated.
: This annunciators indicate MAX (Maximum), MIN
(Minimum), MAX-MIN (Maximum minus Minimum), or AVG
(Average) reading is being displayed.
DATA : Secondary display for Dual Display data.
kHz : These annunciators indicate the function being selected
and/or the appropriate measurement units.
: Analog bar graph with overload ag, polarity and scale.
Set rotary switch to position for voltage application below
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0.4V with similar operation procedures.
Refer (4-2) for enabling dual display RPM function.
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Hz Function: 4 trigger levels selectable through the LEVEL push
button for advanced applications in this function. Also refer to section
5.8 of this manuals for more details.
4.3.2 DUAL DISPLAY RPM Function
Set the meter to the corresponding primary function. See note
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below for function availability.
Press button to toggle to
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engine, or to
Insert output plug of inductive pick up with the positive (red) into
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RPM
Clamp the inductive pick up to a spark plug wire with the arrow
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sign facing the spark plug. Make sure that the pick up jaws are
completely closed.
Observe the secondary digital display for RPM readings.
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Page 3
jack and the negative (black) into the RPM jack.
for 4-stroke engine.
for 2-stroke and DIS
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