General Technologies CT8027 User Manual

General Technologies Corp.

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 600 VDC or 600V 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 Specifications

Display: 4 digits LCD, max. of 9999 display
Polarity: Automatic, (-) negative polarity indication
Zero adjustment: Automatic
Sample rate: 0.25 Sec., 0.05 Sec. for bar graph
Over range indication: “OL” is displayed
Power: 9-volt battery type NEDA 1604, IEC6F22
Battery life: Approx. 70 hours. (w/ alkaline batteries)
Dimension: 5.9”x2.95”x1.34” or 150x75x34 mm.
Weight: Approx. 8.9 Oz. or 252g (with battery).
Accesories: User’s Manual, Test Leads, Protective

Holster, Ha rd carriying ca se, K- type
temperature probe, Inductive pick-up and
9V battery.

3.2 Electrical Specifications

Accuracies are ±(% of reading + number of least signicant 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.

CT8027

Professional Automotive Digital Multimeter

Function Range Accuracy

0.5%+6

0.5%+2

0.8%+2

1.5%+5

- < 3.5 V Test Voltage 600 Vrms

0.01%+2

0.04%/krpm +2

0.04%/krpm/cyl +2

2 RPM

2%+1

2%+2

Resistance

Diode Test

Frequency

Fuel

Injector

Tachometer

Dwell

Temperature

999.9Ω

9.999 kΩ,

99.99 kΩ

999.9 kΩ,

4.000 MΩ

40.00 MΩ

9.999 V

999.9Hz to

20.0 kHz

0.05 - 250 mS

0.0 - 100 %

0.05 - 250 mS

0.0 - 100 %

120-20000 RPM

60-10000 RPM

30-5000 RPM

0.0º - 360.0º 1.2º/krpm+1

0.0º - 100.0º 0.04º/krpm/cyl +2

-20º to 300ºC 3ºC+1

301º to 500ºC

0º to 572ºF 6ºF+2

573º to 932ºF

4. OPERATION

4.1 Instrument Description

1) Case

2) 4 Digit LCD display

3) Secondary Functions Button

4) Auto/Manual Select

5) Function Switch

6) Current Measurment Input

7) Common Input

8) Measurements Input

9) Trigger and Rel. Button

10) Hold and Max/Min. Button

Input

Impedance

-

1, 2, 20 and 200 Vrms

Selectable threshold

0.05mS+1

0.05mS+1

K-Type Thermocouple

1

2

3
4

5

6

Probe

Remarks

1.3 V

Max. Test

Voltage

(2.7 V in

999.9Ω
range)

Selectable

+/- Slope,

and

Number of

Cylinders

RPM 4

RPM 2

RPM 2M

1 to 12

Cyl.

Overload

Protection

600 Vrms

600 Vrms

600 Vrms

600 Vrms

600 Vrms

600 Vrms

10
9

8

7

Function Range Accuracy

999.9 mV,

DC Voltage

AC Voltage

DC Current

AC Current

9.999 V,
99,99V

600 V 0.3%+5

999.9 mV 2.5%+5 10 MΩ,

9.999 mV,

99.99 V

4000 mA

10.00 A

4000 mA

10.00 A

0.3%+3

2.5%+5 50~500Hz

1.2%+6

0.8%+4

2.5%+10

1.2%+3

Input

Impedance

10 MΩ,

16MΩ for

999.9 mV
range

16MΩ for

999.9 mV
range

0.03V/A
Burden

Voltage

0.03V/A
Burden

Voltage

Remarks

- 600 Vrms

50~200Hz

-

-

Overload

Protection

600 Vrms

10 A - 250V

Fast Acting

Fuse

10 A - 250V

Fast Acting

Fuse

4.2 Display Description

Autoranging Hold

Auto Power Off

Record

Function

Max./Min.

and Average

Bar Graph/Trigger Polarity

Digital

Readout

Analog

Bar Graph

Low Battery

Relative
Measurement

Bar Graph
Overflow

4.3 Measurement Procedures

CAUTION: Maximum Input Voltage is 600Vrms,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.

Measuring
resistance
and
continuity

M e as u r in g

Voltages

The measurement will be shown in the LCD Display when the

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probe are connected. For Continuity Test a continuous beeping
sound indicates that the measured resistance is < 100 Ω.

4.3.4 Frequency measurement

Connect the black test lead to the “COM” socket and red test lead

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to the “+” socket.
Set the FUNCTION switch to the “ V Hz” function.

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The instrument default to VDC measurement. To measure

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frequency press the SELECT button momentarily twice, and the
Hz will appear on the display.

Connect the read probe into the “+” input and the black probe

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into the “COM” input.
When the frequency function is selected, the trigger level defaults

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to 1 Volt. If the readings are unstable or if there is not reading at
all, it maybe be necesary to change the trigger level. To change
the trigger level, press the “RANGE” button once to display the
selected level, and then press the “RANGE” button within 1
second. Every time the button is pressed the trigger level will
change to the next value (1V, 2V, 20V and 200V).

Connect the test leads across the source or circuit under

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measurement. Readout will show on the LCD display.

4.3.5 Tach (RPM) Measurement

4.3.1 DC/AC Voltage measurement

Connect the black test lead to the “COM” socket and red test lead

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to the “+” socket.
Set the FUNCTION switch to the “ V Hz” function.

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The instrument default to DC measurement. To measure AC

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Voltages press the SELECT button momentarily.

• Connect the read probe into the “+” input and the black probe

into the “COM” input.
Connect the test leads across the source or load under

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measurement. Readout will show on the LCD display.

4.3.2 DC Current measurement

Connect the black test lead to the “COM” socket and red test lead

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to the “A mA” input connector. .
Set the FUNCTION switch to the “mA A ” function.

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Connect the test leads in series with the source or load under

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measurement.
The instrument default to DC measurement. To measure AC

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Current press the SELECT button momentarily.
Connect the test leads in series with the source or load under

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measurement. Readout will show on the LCD display.

4.3.3 Resistance measurement and Continuity Test

CAUTION: Maximum Input Voltage for this function is 600 Vrms

do not exceed this rating to avoid personal injuries or
damage to the instrument. Also ensure there is no
power applied to the component or circuit and all
capacitors are discharged.

Connect the black test lead to the “COM” socket and red test lead

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to the “+” socket.
Set the FUNCTION switch to the “Ω ” position. The instrument

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will default to Resistance measurement, to select the Continuity
Test function press the “SELECT” button momentarily.

Connect the test leads across the componet or circuit under

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measurement.

Taking Tach

Readings

Connect the black lead plug of the inductive pick-up into the

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“COM” socket and red lead plug to the “+” socket.

Set the FUNCTION switch to the position.

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Press the SELECT button to select through “RPM ” for 4

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strockes, “RPM ” for 2 strockes and DIS, and “RPM M” for 2
strockes with waste spark ignition system engines.

Open the Inductive Pick-up clamp and insert a spark plug wire

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inside, observing that the arrow on the Inductive Pick-up points
to the spark plug, and then close the clamp making sure that the
clamp jaws are completely close. The RPM will be shown in the
LCD Display when the engine is running.

4.3.6 Dwell Angle Measurement

Connect the black test lead to the “COM” socket and red test lead

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to the “+” socket.
Set the FUNCTION switch to the “ %” position, and press

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the SELECT button once to select the Dwell function.
The Number of cylinders defaults to 4 (4-\). Press the “Cylinder

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/RANGE” switch to display the cylinders setting, and immediately
press the button again to select the number of cylinders (1
through 12) of the engine under test.