General Technologies CT8025 User Manual
General Technologies Corp.
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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
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rms. 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: 3-1/2 digits LCD, max. of 1999 display
Polarity: Automatic, (-) negative polarity indication
Zero adjustment: Automatic
Sample rate: 0.5 Sec.
Over range indication: “1” or “-1” is displayed
Power: 9-volt battery type NEDA 1604, IEC6F22
Battery life: Approx. 50 hours. (w/ alkaline batteries)
Dimension: 5.55”x2.71”x1.41” or 141x 69x36 mm.
Weight: Approx. 6.7 Oz or 190g (with battery).
Accesories: User’s Manual, Test Leads, Protective
Holster, Soft Pouch, K-type temperature
probe and 9V battery
3.2 Electrical Specifications
Accuracies are ±(% of reading + number of least significant
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digits) at 23°C ±5°C, less than 75% RH.
CT8025
Automotive Digital Multimeter
Function Range Accuracy
Temperature
ºF Version
Dwell Angle
Continuity
Diode Test
32 to 104ºF
-40 to 752ºF
752 to 1832ºF
3 to 8 Cyl.
0-120º
Buzzer sounds when <100Ω
Test Current:1.0±0.6mA Test Voltage: 2.4 V Max.
3.0%+1 Built in Sensor
0.75%+3
3.0%+10
1.5%+2
Input
Impedance
K-Type Thermocouple
0.1º Resoultion
Test Voltage: 2.4 V Max.
Remarks
Probe
4. OPERATION
4.1 Instrument Description
1) Case
2) 3-1/2 Digit LCD display
3) Power OFF position
4) Tachometer function
5) Function/Range Switch
6) Temperature function
7) Resistance function
8) Temperature probe socket
9) Input and common connector
10) DC Voltage function
11) AC Voltage function
12) DC Current function
13) Dwell function
4.2 Measurement Procedures
CAUTION: Maximum Input Voltage is 600Vrms,do not exceed
this rating to avoid personal injuries or damage to
the instrument. The range FUNCTION/RANGE
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.
Overload
Protection
250 Vp-p
250 Vrms
250 Vrms
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Function Range Accuracy
DC Voltage 20V, 600V 0.8%+2
AC Voltage 600V 1.5%+5
10A
2000Ω, 20kΩ
200kΩ, 2MΩ
20MΩ
500 to 10000
RPM
DC Current
Resistance
Tachometer
2.0%+5 -
0.8%+3 -
1.5%+5 -
3.0%+10 -
0.8%+2 Test time: 20 Sec. 250Vp-p
Input
Impedance
1 MΩ
450 KΩ
Remarks
40~400Hz 600 Vp-p
3.2V
max. test
Voltge
Overload
Protection
- 600 Vp-p
10 A - 250V
Fuse
250 Vp-p
4.2.1 DC Voltage measurement
Connect the black test lead to the “COM” socket and red test lead
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to the “V Ω” socket.
Set the FUNCTION/RANGE switch to the desired range in the
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“V ” function. If the voltage range is not known beforehand, set
the switch to the highest range and work down as needed.
Connect the test leads across the source or load under
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measurement.
The measurement and polarity will be shown the LCD Display
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when the probe are connected.
4.2.2 AC Voltage measurement
Connect the black test lead to the “COM” socket and red test lead
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to the “V Ω” socket.
Set the FUNCTION/RANGE switch to the desired range in the
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“V ” function.
Connect the test leads across the source or load under
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measurement.
The measurement will be shown in the LCD Display when the
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probe are connected.
4.2.3 DC Current measurement
Connect the black test lead to the “COM” socket and red test lead
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to the “A” input connector. .
Set the FUNCTION/RANGE switch to the “A ” function.
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Connect the test leads in series with the source or load under
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measurement.
The measurement and polarity of the current will be shown the
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LCD Display when the current is flowing through the instrument.
4.2.4 Resistance measurement
CAUTION: Maximum Input Voltage for this function is 250 Vrms
for less than 10 Sec., 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 “V Ω” socket.
Set the FUNCTION/RANGE switch to the desired range in the
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“Ω” function. If the resistancege range is not known beforehand,
set the switch to the highest range and work down as needed.
Connect the test leads across the componet or circuit under
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measurement.
The measurement will be shown in the LCD Display when the
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probe are connected.
4.2.5 Tach (RPM) Measurement
CAUTION: Maximum Input Voltage for this function is 250 Vrms
for less than 10 Sec., do not exceed this rating to
avoid personal injuries or damage to the instrument.
Connect the black test lead to the “COM” socket and red test lead
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to the “V Ω” socket.
Set the FUNCTION/RANGE switch to the corresponding number
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of cylinders of the engine to test in the “TACH” function.
Connect the black test lead to to the vehicle ground or negative
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(-) terminal of the battery, and the red test lead to the breaker
point of the distributor or negative (-) terminal of the ignition coil.
The RPM will be shown in the LCD Display when the engine is
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running.
4.2.6 Dwell Angle Measurement
CAUTION: Maximum Input Voltage for this function is 250 Vrms
for less than 10 Sec., do not exceed this rating to
avoid personal injuries or damage to the instrument.
Connect the black test lead to the “COM” socket and red test lead
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to the “V Ω” socket.
Set the FUNCTION/RANGE switch to the corresponding number
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of cylinders of the engine to test in the “Dwell” function.
Connect the black test lead to to the vehicle ground or negative
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(-) terminal of the battery, and the red test lead to the breaker
point of the distributor or negative (-) terminal of the ignition coil.
The Dwell angle will be shown in the LCD Display when the
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engine is running.
When the Function/Range switch is set to the “TEMP” position,
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and no external thermocouple is connected, the meter will
automatically measure ambient temperature.
4.3 Other Functions
4.3.1 Diode/Continuity test
CAUTION: Maximum Input Voltage for this function is 250
Vrms for less than 10 Sec., do not exceed this
rating to avoid personal injuries or damage to the
instrument. Also ensure there is no power applied
to the diode.
Connect the black test lead to the “COM” socket and red test lead
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to the “V Ω” socket.
Set the FUNCTION/RANGE switch to the “2000 ” within the
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Ω function.
For diode testing proceed to connect the test leads across the
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diode observing the polarity: red probe to the anode (+) of the
diode and black test lead to the cathode (-) .
For continuity test proceed to connect the test leads across the
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circuit or component, the buzzer will sound if the circuit resistance
is below 100Ω.
5. MAINTENANCE
CAUTION: Before attempting battery removal or replacement,
disconnect test leads and remove the instrument
from any energized circuit to avoid shock hazard.
5.1 Battery Replacement
To replace the battery, remove the screw of the back Battery Cover
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(back of the case) and remove the battery.
Replace with a new 9 V alkaline battery type NEDA 1604 or
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IEC6F22 observing the proper polarity from the diagram on the
label inside the battery compartment.
Reinstall the battery cover and tighten the securing screw.
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5.2 Fuse replacement
Remove the screw of the back Battery Cover (back of the case)
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and remove the battery.
Remove the screws at the bottom of the case and of the battery
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compartment.
Replace new fuse only with the identical type and rating.
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F2=10A: Type IEC60127-2 orUL248-14 (6.3x25.4mm)
fast acting fuse, rated at 10A/250V.
Reinstall the back cover, and replace the four screws,
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Reinstall the battery observing the polarity on the battery compart-
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ment label, the battery cover and tighten the securing screw.
5.3 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 instrument to prevent possible shorts and damage.
6. WARRANTY
One year limited warranty, excluding batteries and fuses. For details see Standard Warranty Information in our webpage or request
a printed copy.
4.2.6 Temperature Measurement
Set the FUNCTION/RANGE switch to the “TEMP” position.
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Connect the K-type thermocouple probe connector into the
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Temperature socket observing the polarity of the connector and
socket.
General Technologies Corp.
#121 - 7350 72nd Street Tel.: (604) 952-6699
Delta, BC Fax: (604) 952-6690
Canada V4G 1H9 www.generaltechnologies.net
© Copyright 2001 General Technologies
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