Jensen JTM-69A Manuale utente
User’s Guide
True RMS Digital Multimeter
Model JTM-69A
Introduction Jensen 69A
Congratulations on your purchase of Jensen’s JTM-69A true rms Digital
Multimeter. This autoranging meter measures AC/DC Voltage, AC/DC
Current, Resistance, Capacitance, Frequency, Duty Cycle, Temperature,
Diode Test and Continuity. Proper use and care of this meter will provide
many years of reliable service.
Safety
International Safety Symbols
This symbol, adjacent to another symbol or terminal,
indicates the user must refer to the manual for further
information.
This symbol, adjacent to a terminal, indicates that, under
normal use, hazardous voltages may be present
Double insulation
Overvoltage Catagory III
This meter meets the IEC 610-1-95 standard for OVERVOLTAGE
CATEGORY III. Cat III meters are protected against overvoltage
transients in fixed installation at the distribution level. Examples include
switches in the fixed installation and some equipment for industrial use
with permanent connection to the fixed installation.
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Safety Precautions
1. Improper use of this meter can cause damage, shock, injury or
death. Read and understand this user manual before operating the
meter.
2. Make sure any covers or battery doors are properly closed and
secured.
3. Always remove the test leads before replacing the battery or fuses.
4. Inspect the condition of the test leads and the meter itself for any
damage before operating the meter. Repair any damage before
use.
5. Do not exceed the maximum rated input limits.
6. Use great care when making measurements if the voltages are
greater than 25VAC rms or 35VDC. These voltages are considered
a shock hazard.
7. Always discharge capacitors and remove power from the device
under test before performing Capacitance, Diode, Resistance or
Continuity tests.
8. Remove the battery from the meter if the meter is to be stored for
long periods.
9. To avoid electric shock, do not measure AC current on any circuit
whose voltage exceeds 250V AC.
10. Voltage checks on electrical outlets can be difficult and misleading
because of the uncertainty of connection to the electrical contacts.
Other means should be used to ensure that the terminals are not
"live".
Input Limits
Function Maximum Input
V DC, VAC 1000V DC/ 600V AC
Ohms, Capacitance, Diode,
Frequency, Continuity 250V DC/AC
mA DC/AC 400mA DC/AC
10A DC/AC 10A DC/AC (30seconds max
every 15 minutes)
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Specifications
Function Range Resolution Accuracy
400mV 0.1mV ±(0.5% reading + 2 digits)
4V 0.001V
40V 0.01V
400V 0.1V ±(1.0% reading + 2 digits)
DC Voltage
600V 1V ±(1.5% reading + 2 digits)
400mV 0.1mV ±(1.0% reading + 70 digits)
4V 0.001V
±(1.0% reading + 3 digits)
40V 0.01V
400V 0.1V ±(1.2% reading + 3 digits)
AC Voltage
50/60Hz
600V 1V ±(2.0% reading + 4 digits)
400μA 0.1μA
4000μA 1μA
40mA 0.01mA
400mA 0.1mA
±(1.5% reading + 3 digits)
DC Current
10A 0.01A
±(2.5% reading + 5 digits)
400μA 0.1μA
4000μA 1μA
40mA 0.01mA
400mA 0.1mA
±(1.8% reading + 5 digits)
AC Current
50/60Hz
10A 0.01A
±(3.0% reading + 7 digits)
400Ω0.1Ω±(1.0% reading + 4 digits)
4kΩ0.001kΩ±(1.0% reading + 2 digits)
40kΩ0.01kΩ
400kΩ0.1kΩ
4MΩ0.001MΩ±(1.2% reading + 2 digits)
Resistance
40MΩ0.01MΩ±(2.0% reading + 5 digits)
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4nF 0.001nF
±(5.0% reading + 10digits)
40nF 0.01nF
±(5.0% reading + 7 digits)
400nF 0.1nF ±(3.0% reading + 5 digits)
4μF 0.001μF
40μF 0.01μF ±(3.5% reading + 5 digits)
Capacitance
200μF 0.1μF ±(5.0% reading + 5 digits)
9.999Hz 0.001Hz
99.99Hz 0.01Hz ±(1.5% reading + 5 digits)
999.9Hz 0.1Hz
9.999kHz 0.001kHz
99.99kHz 0.01kHz
999.9kHz 0.1kHz
±(1.2% reading + 2 digits)
9.999MHz 0.001MHz ±(1.5% reading + 4 digits)
Frequency
Sensitivity: 0.8V rms min. @ 20% to 80% duty cycle
and <100kHz; 5Vrms min @ 20% to 80% duty cycle
and > 100kHz.
Function Range Resolution Accuracy
Duty Cycle 0.1 to 99.9% 0.1% ±(1.2% reading + 2 digits)
Pulse width: 100μs - 100ms
Frequency: 5Hz to 150kHz
Temp °F -4 to 1400°F 1°F
Temp °C -20 to 760°C1°C ±(3.0% reading + 3 digits)
(meter only, probe accuracy
not included)
NOTE: Accuracy is stated at 65oF to 83oF (18oC to 28oC) and less than
70% RH.
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Diode Test Test current of 0.3mA maximum, open
circuit voltage 1.5V DC typical
Continuity Check Audible signal will sound if the resistance is
less than approximately 30Ω, test current
<0.7mA
Temperature sensor Requires type K thermocouple
Input Impedance 7.5MΩ(VDC and VAC)
AC Bandwidth 40 to 400Hz
Display 4000 count backlit Liquid Crystal
Overrange indication “OL” is displayed
Polarity Automatic (no indication for positive
polarity); Minus (-) sign for negative polarity.
Measurement Rate 2 times per second, nominal
Auto Power Off Meter automatically shuts down after 15
minutes of inactivity
Low Battery Indication “BAT” is displayed if battery voltage drops
below operating voltage
Battery One 9V battery; NEDA 1604, IEC 6F22
Fuses mA, μA and Temperature ranges;
0.5A/250V fast blow
10A range, 10A/250V fast blow
Operating Temperature 32oF to 122oF (0oC to 50oC)
Storage Temperature -4oF to 140oF (-20oC to 60oC)
Relative Humidity <70% operating, <80% storage
Operating Altitude 7000ft (2000 meters) maximum.
Weight 7 oz. (200g).
Size 6” x 3” x 1.75” (15.25x 7.6x 4.45cm)
Safety For indoor use and in accordance with the
requirements for double insulation to
IEC1010-1 (1995); EN61010-1 (1995)
Overvoltage Category III.
Meter Description
1. Liquid Crystal Display
2. Range button
3. Hz/Duty Cycle button
4. Mode button
5. Rotary Function switch
6. COM jack
7. 10A Current jack
8. Hold button
9. Relative button
10. Backlight button
11. Positive input jack
Note: Tilt stand, fuse and battery compartment are on rear of unit.
Symbols
AC Alternating current or voltage
DC Direct current or voltage
•))) Continuity
Diode test
mV, V millivolt, volt (voltage)
Ω, KΩ, MΩ ohm, kilohm, megohm (resistance)
µA, mA, A microamp, milliamp, Amp (current)
nF, uF nanofarad, microfarad (capacitance)
Hz kHz hertz, kilohertz (frequency)
% % duty cycle
OF, OC Degrees Fahrenheit, Centigrade (temperature)
AUTO Autorange
BAT Low battery
HOLD Display hold
REL Relative
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Operating Instructions
AC or DC Voltage Measurements
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1. Insert the black test lead banana plug into the
negative COM jack and the red test lead banana
plug into the positive Vjack.
2. Turn the rotary switch to the VAC or VDC
position.
3. Touch the test probes to the circuit under test
and read the voltage on the display.
Note: Pressing the Hz/% button while in the voltaget
function will switch the display to frequency or d
C Current M
ut
AC or D easurements
s on the 10A scale for
V
y cycle
CAUTION: Do not make current measurement
longer than 30 seconds every 15 minutes. Exceeding 30 seconds may
cause damage to the meter and/or the test leads.
1. Insert the black test lead banana plug into the negative COM jack
A
position.
test and read
while in the current function will switch
and the red test lead banana plug into the;
a. Positive uA/mA jack for currents to 400m
b. Positive 10A jack for currents to 10A
2. Turn the rotary switch to the uA, mA or A
3. Press the MODE button to select AC or DC current
4. Touch the test probes in series with the circuit under
the current on the display.
Note: Pressing the Hz/% button
the display to frequency or duty cycle
Resistance Measurements
WARNING: To avoid electric shock, disconnect power to the unit
under test and discharge all capacitors before taking any resistance
measurements.
1. Insert the black test lead banana plug into the
negative COM jack and the red test lead banana
plug into the positive Ωjack.
Ω
2. Turn the rotary switch to the Ωposition.
3. Touch the test probes to the circuit or device
under test and read the resistance on the display.
Capacitance Measurements
WARNING: To avoid electric shock, disconnect power to the unit
under test and discharge all capacitors before taking any capacitance
measurements.
Cap
1. Insert the black test lead banana plug into the
negative COM jack and the red test lead banana
plug into the positive CAP jack.
2. Turn the rotary switch to the CAP position.
3. Touch the test probes to the circuit or device
under test and read the capacitance on the
display.
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Frequency or Duty Cycle Measurements
Hz
1. Insert the black test lead banana plug into the
negative COM jack and the red test lead banana
plug into the positive HZ jack.
2. Turn the rotary switch to the FREQ % position.
3. Press the Hz/% button to select “Hz” or “%”.
4. Touch the test probes to the circuit or under test
and read the frequency or duty cycle on the
display.
Continuity Measurements
1. Insert the black test lead banana plug into the negative COM jack
and the red test lead banana plug into the positive Ωjack.
2. Turn the rotary switch to the •))) position.
3. Press the MODE button until “•)))” appears in the display.
4. Touch the test probes to the circuit or device under test. If the
resistance is less than approximately 30Ωthe buzzer will sound
and the resistance appears on the display.
Note: The meter automatically holds the 400Ωrange when continuity is
selected
Temperature Measurements
1. Insert the type K thermocouple probe black test
lead banana plug into the negative COM jack and
the red test lead banana plug into the positive
Temp jack..
2. Turn the rotary switch to the oCor oFposition.
3. Read the temperature on the display.
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