Circuit-test DLM-260 User manual

OPERATING INSTRUCTIONS
DLM-260
DIGITAL LCR METER
SPECIFICATIONS
Display: 3½digit liquid crystal display (LCD) with a
maximum reading of 1999.
Polarity: Automatic, positive implied, negative polarity
indication.
Overrange: (OL) or (-OL) is displayed.
Zero: Automatic.
Low battery indication: The “ ” is displayed when the
battery voltage drops below the operating level.
Measurement rate: 2.5 times per second, nominal.
Operating Environment: 0°C to 40°C at <70% R.H.
Storage Temperature: -20°C to 60°C, 0 to 80% R.H.
with battery removed from meter.
Accuracy: Stated accuracy at 23°C±5°C, <75% R.H.
Power: Single standard 9-volt battery, NEDA 1604, JIS
006P, IEC 6F22.
Battery life: 60 hours typical with carbon-zinc.
Dimensions: 200mm (H) x 90mm (W) x 40mm (D).
Weight: Approx. 14 oz. (400g) including battery.
Accessories: One pair test leads, one spare fuse installed,
9V battery (installed) and Operating Instructions.
DC VOLTS
Ranges: 20V
Accuracy: ±(2.0%rdg + 1dgt)
Input impedance: 1MΩ
Overload protection: 25V DC or AC rms
TEMPERATURE
Ranges: -20°C to 750°C
Resolution: 1°C
Accuracy:
±(2.0%rdg + 3dgts) on -20°C to 500°C
±(3.0%rdg + 2dgts) on 500°C to 750°C
DIODE TEST
Including: , continuity test
Test current: 1.0mA±0.6mA
Open voltage: 3.0VDC typical
Accuracy: ±(3.0%rdg +1dgt)
Continuity: <30dgts
Display: Forward junction voltage
Overload protection: 25V DC or AC rms
SIGNAL OUTPUT
Signal: +3V, -0.5V square wave, 50% duty
Voltage: Hi: +5V approx
Lo: -2V approx
Frequency: 2.5KHz square wave
Output impedance: 3.5KΩ
Overload protection: 25V DC or AC rms
FREQUENCY (Autoranging)
Ranges: 2KHz, 20KHz, 200KHz, 2000KHz, 15MHz
Accuracy: ±(0.1%rdg +1dgt)
Sensitivity: 1.0Vrms min (TTL signal)
Overload protection: 25V DC or AC rms
CAPACITANCE
Ranges: 200pF, 2nF, 20nF, 200nF, 2µF, 20µF, 200µF,
2000µF, 20mF
Accuracy:
±(2.0%rdg + 30dgts) on 200pF range
±(2.0%rdg + 10dgts) on 2nF to 20µF ranges
±(3.0%rdg + 10dgts) on 200µF to 20mF ranges
Test frequency:
1000Hz on 200pF to 20nF ranges
80Hz on 200nF to 2µF ranges
26Hz on 20µF range
10.5Hz on 200µF to 20mF ranges
Overload protection: 0.1A/250V fast blow fuse
Note: In lower range 200pF, 2nF subtract residual offset
reading from result with test leads opening.
RESISTANCE
Ranges: 200Ω, 2KΩ, 20KΩ, 200KΩ, 2000KΩ, 20MΩ,
200MΩ, 2000MΩ
Resolution: 200Ωrange 100mΩ
Accuracy:
±(0.3%rdg + 3dgts) on 200Ωrange
±(0.3%rdg + 1dgt) on 2KΩto 2000KΩranges
±(2.0%rdg + 2dgts) on 20MΩrange
±[(5.0%rdg - 10dgts) + 10dgts] on 200MΩto 2000MΩ
ranges
Open circuit volts:
3.0VDC on 200Ω, 200MΩ, 2000MΩranges
0.3VDC on other ranges
Overload protection: 25V DC or AC rms
INDUCTANCE
Ranges: 200µH, 2mH, 20mH, 200mH, 2H, 20H
Accuracy: ±(5.0%rdg + 3dgts)
Test frequency:
1000Hz on 200µH to 20mH ranges
80Hz on 200mH to 2H ranges
26Hz on 20H range
Overload protection: 0.1A/250V fast blow fuse
Note: In lower range 200µH, 2mH subtract residual
offset reading from result with test leads being
shorted.
OPERATION
However, electrical noise or intense electromagnetic
fields in the equipment may disturb the measurement cir-
cuit. Measuring instruments will also respond to unwanted
signals that may be present within the measurement circuit.
Users should exercise care and take appropriate precau-
tions to avoid misleading results when making measure-
ments in the presence of electronic interference.
Voltage Measurements
1. Connect the red test lead to the DCV-DIODE-Hz “+”
jack and the black test lead to the DCV-DIODE-Hz “−”
jack.
2. Set the Function/Range switch to the DC 20V range.
3. Connect the test leads to the device or circuit being
measured.
4. For dc, a (−) sign is displayed for negative polarity,
positive polarity is implied.
Temperature Measurements
WARNING
Remove test leads being measured.
1. Set the Function/Range switch to the “°C” position.
2. Connect a type k thermocouple to the jack on the in-
strument. Place the probe or thermocouple tip on or in
the material to be measured and take the temperature
reading directly from the display.
Diode Tests and Continuity Measurements
1. Connect the red test lead to the DCV-DIODE-Hz “+”
jack and the black test lead to the DCV-DIODE-Hz “−”
jack.
2. Set the Function/Range switch to the position.
3. Turn off power to the circuit under test.
4. Touch probes to diodes. A forward-voltage drop on
diode. Microwave diode about 0.6VDC typical.
5. Reverse probes. If the diode is good, display rending
“OL”.
6. If the junction is measured in a circuit and a low reading
is obtained with both lead connections, the junction may
be shunted by a resistance of less than 1kΩ. In this case
the diode must be disconnected from the circuit for ac-
curate testing.
7. If display reading <30dgts, the beeper sounds continu-
ously.
Signal Output
1. Set the Function/Range switch to the “ ” position.
2. Connect the red test lead to the DCV-DIODE-Hz “+”
jack and the black test lead to the DCV-DIODE-Hz “−”
jack.
3. Connect the test leads to the points of signal input.

Frequency Measurements
1. Set the Function/Range switch to the Hz position.
2. Connect the red test lead to the DCV-DIODE-Hz “+”
jack and the black test lead to the DCV-DIODE-Hz “−”
jack.
3. Connect the test leads to the point of measurement and
read the frequency from the display.
Capacitance
1. Discharge capacitors before trying to measure it.
2. Set the Range to the desired F range.
3. Insert the leads directly in to socket or test leads sockets.
4. Never apply an external voltage to sockets or damage to
the meter may result.
5. Read the capacitance directly from the display.
Note: In lower range 200pF, 2nF subtract residual offset
reading from result with test leads opening
Resistance
1. Set the Range to the desired “Ω” resistance range.
2. Never apply an external voltage to the sockets or dam-
age to the meter may result.
3. Insert the leads directly in to socket or test leads sockets.
4. Read the Resistance directly from the display.
WARNING
The accuracy of the functions might be slightly affected,
when exposed to a radiated electromagnetic field
environment, e.g., radio, telephone or similar.
Inductance
1. Set the Ranges to the desired H range.
2. Never apply an external voltage to the sockets damage
to the meter may result.
3. Insert the inductor leads directly into sockets or test
leads sockets.
4. Read the inductance directly from the display.
Note: In lower range 200µH, 2mH subtract residual
offset reading from result with test leads being
shorted.
MAINTENANCE
WARNING
Remove test leads before changing battery or fuse or
performing any servicing.
Battery Replacement
Power is supplied by a 9 volt “transistor” battery.
(NEDA 1604 IEC 6F22). The “ ” appears on the LCD
display when replacement is needed. To replace the battery,
remove the two screws from the back of the meter and lift
off the battery case. Remove the battery from battery con-
tacts.
Fuse Replacement
If no capacitance and inductance measurements are pos-
sible, check for a blown overload protection fuse. For
access to fuses, remove the two screws from the back of
the meter and lift off the battery case. Replace F1 only
with the original type 0.1A/250V, fast acting fuse.
Cleaning
Periodically wipe the case with a damp cloth and deter-
gent, do not use abrasives or solvents.
V1. 043008