Digi-Sense 20250-50 Manuel utilisateur
THE STANDARD IN PRECISION MEASUREMENT
User Manual
Compact Digital Multimeters
with NIST-Traceable Calibration
Model 20250-50
(2000 count, manual ranging)
Model 20250-51
(4000 count, autoranging)
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Introduction
Digi-Sense Compact Digital Multimeters (manual ranging
model 20250-50; autoranging model 20250-51) are a
must-have on your electrical tool belt. These versatile and
simple-to-use DMMs safely measure common ranges of
voltage, current, and resistance, and are packaged in a very
convenient compact size. Large display provides easy-to-
read measurements. The instruments are fully tested and
calibrated to NIST-traceable standards. Careful use of the
meter will provide years of reliable service.
Safety
These meters have been designed for safe use, but must
be operated with caution. The rules listed below must be
carefully followed for safe operation.
• NEVER apply voltage or current to the meter that exceeds
the specified maximum:
Input Limits
Function Maximum Input
VAC 600 V DC/AC
V DC or V AC 600 V DC/AC, 200 Vrms on 200 mV range
mA DC 200 mA 250 V fast acting fuse
A DC 10 A 250 V fast acting fuse (30 seconds
max every 15 minutes)
Resistance, Continuity 250 Vrms for 15 sec max
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• USE EXTREME CAUTION when working with
high voltages.
• DO NOT measure voltage if the voltage on the "COM"
input jack exceeds 500 V above earth ground.
• NEVER connect the meter leads across a voltage source
while the rotary function switch is in the current, resis-
tance, or diode mode. Doing so can damage the meter.
• ALWAYS discharge filter capacitors in power supplies and
disconnect the power when making resistance or diode
tests.
• ALWAYS turn off the power and disconnect the test leads
before opening the doors to replace the batteries.
• NEVER operate the meter unless the back cover and the
battery and fuse doors are in place and fastened securely.
• NEVER use the meter if the meter or test leads look
damaged, or if you suspect that the meter is not operating
properly.
• NEVER ground yourself when taking electrical measure-
ments. Do not touch exposed metal pipes, outlets, fix-
tures, etc., which might be at ground potential. Keep your
body isolated from ground by using dry clothing, rubber
shoes, rubber mats, or any approved insulating material.
• ALWAYS use caution when working above 60 V dc or
30 V ac rms. Such voltages pose a shock hazard.
• ALWAYS keep your fingers behind the finger guards
on the probes.
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Safety Symbols
This symbol adjacent to another symbol,
terminal or operating device indicates that the
operator must refer to an explanation in the User
Manual to avoid personal injury or damage to
the meter.
This WARNING symbol indicates a potentially
hazardous situation, which if not avoided, could
result in death or serious injury.
This CAUTION symbol indicates a potentially
hazardous situation, which if not avoided, may
result damage to the product.
This symbol advises the user that the terminal(s)
so marked must not be connected to a circuit
point at which the voltage with respect to earth
ground exceeds (in this case) 500 VAC or VDC.
This symbol adjacent to one or more terminals
identifies them as being associated with ranges
that may, in normal use, be subjected to particu-
larly hazardous voltages. For maximum safety,
the meter and its test leads should not be han-
dled when these terminals are energized.
This symbol indicates that a device is protected
throughout by double insulation or reinforced
insulation.
MAX
500V
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Unpacking
Check individual parts against the list of items below. If
anything is missing or damaged, please contact your
instrument supplier immediately.
1. Instrument
2. Test leads
3. One type K temperature probe (model 20250-51 only)
4. One 9 V battery
5. Carrying case
6. User manual
7. NIST-traceable calibration report with data
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3
every
4
15 min.
F
2
10A COM
M AX
V
RangeMode
Ω
C
μ
μ
C
1
AUTO
DC
AC
REL F
5
6
78
9
Meter Description (Model 20250-50)
1. 2000-count LCD
2. Rotary function switch
3. 10 A (positive) jack
4. COM (negative) jack
5. Positive input jack
Note: Tilt stand and battery
compartment are on rear
of unit.
Meter Description (Model 20250-51)
1. 4000-count LCD with symbols
2. Rotary function switch
3. 10 A (positive) jack
4. COM (negative) input jack
5. Positive input jack
6. MODE button
7. Range button
8. Data HOLD button
9. Relative (REL) button
Note: Tilt stand and battery
compartment are on rear of unit.
1
2
3
4
5
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Symbols and Annunciators
Continuity
BAT Low battery
Diode
AC Alternating Current or Voltage
DC Direct Current or Voltage
HOLD Data HOLD (model 20250-51)
AUTO Autoranging (model 20250-51)
Setup and Operation
WARNING: Risk of electrocution. High-voltage circuits,
both AC and DC, are very dangerous and should be
measured with great care.
1. ALWAYS turn the rotary function switch to the OFF
position when the meter is not in use. This meter has
Auto Power-Off that automatically shuts the meter OFF
if 15 minutes elapse between uses.
2. If “OL” appears in the display during a measurement,
the value exceeds the range you have selected. Change
to a higher range.
NOTE: On some low AC and DC voltage ranges, with the
test leads not connected to a device, the display may show
a random, changing reading. This is normal and is caused
by the high-input sensitivity. The reading will stabilize and
give a proper measurement when connected to a circuit.
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AC/DC Voltage Measurements
CAUTION: Do not measure AC/ DC voltages if a motor
on the circuit is being switched ON or OFF. Large
voltage surges may occur that can damage the meter.
Model 20250-50: AC Voltage Measurement
WARNING: Risk of Electrocution. The probe tips may
not be long enough to contact the live parts inside
some 240 V outlets for appliances because the con-
tacts are recessed deep in the outlets. As a result, the
reading may show 0 volts when the outlet actually has
voltage on it. Make sure the probe tips are touching
the metal contacts inside the outlet before assuming
that no voltage is present.
CAUTION: Do not measure AC voltages if a motor on
the circuit is being switched ON or OFF. Large voltage
surges may occur that can damage the meter.
1. Set the rotary function switch to the highest V AC
position.
2. Insert the black test lead banana plug into the negative
COM jack and insert red test lead banana plug into the
positive V jack.
3. Touch the black test probe tip to the negative side of the
circuit and touch the red test probe tip to the positive
side of the circuit.
4. Read the voltage in the display. Reset the rotary function
switch to successively lower V AC positions to obtain a
higher resolution reading. The display will indicate the
proper decimal point and value.
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Model 20250-50: DC Voltage Measurement
1. Set the rotary function switch to the highest V DC
position.
2. Insert the black test lead banana plug into the negative
COM jack and insert the red test lead banana plug into
the positive V jack.
3. Touch the black test probe tip to the negative side of the
circuit and touch the red test probe tip to the positive
side of the circuit.
4. Read the voltage in the display. Reset the function switch
to successively lower V DC positions to obtain a higher
resolution reading. The display will indicate the proper
decimal point and value. If the polarity is reversed, the
display will show (–) minus before the value.
Model 20250-51: AC Voltage Measurement
1. Set the rotary function switch to the V AC position.
2. Insert the black test lead banana plug into the negative
COM jack and the red test lead banana plug into the
positive V jack.
3. Touch the test probe tips to the circuit under test.
4. Read the voltage on the display. The display will indicate
the proper decimal point, value, and symbol (AC, V, etc.).
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Model 20250-51: DC Voltage Measurement
1. Set the rotary function switch to the V DC position
(“mV” will appear in the display).
2. Insert the black test lead banana plug into the negative
COM jack and the red test lead banana plug into the
positive V jack.
3. Touch the test probe tips to the circuit under test. Be
sure to observe the correct polarity (red lead to positive,
black lead to negative).
4. Read the voltage in the display. The display will indicate
the proper decimal point and value. If the polarity is
reversed, the display will show (–) minus before the
value.
AC/DC Current Measurements
Model 20250-50: DC Current Measurement
CAUTION: Do not make current measurements on the
10A scale for longer than 30 seconds. Exceeding 30
seconds may cause damage to meter and test leads.
1. Insert the black test lead banana plug into the negative
COM jack.
2. For current measurements up to 200 mA DC, set the
rotary function switch to the highest DC mA position and
insert the red test lead banana plug into the (mA) jack.
3. For current measurements up to 10 A DC, set the rotary
function switch to the 10 A range and insert the red test
lead banana plug into the (10 A) jack.
4. Remove power from the circuit under test, then open up
circuit at the point where you wish to measure current.
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