Digi-Sense 20250-53, 20250-54 Instruction Manual
THE STANDARD IN PRECISION MEASUREMENT
User Manual
Industrial IP67-Rated Digital Multimeters
with NIST-Traceable Calibration
Model 20250-53
(4000 Count)
Model 20250-54
(4000 Count, True RMS)
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Introduction
Digi-Sense Industrial Digital Multimeters (model 20250-53;
TRMS model 20250-54) are a must-have on your electrical
tool belt—especially for those who need a rugged and
reliable meter. These versatile and simple-to-use units safely
measure the full range of common parameters including voltage,
current, resistance, capacitance, frequency, temperature, and
more. All this technology is packaged in a double-insulated
housing that meets IP67 requirements. The instruments are fully
tested and calibrated to NIST-traceable standards. Careful use of
the meter will provide years of reliable service.
Safety
Safety Warnings
The following safety information must be
observed to insure maximum personal safety
during the operation at this meter:
• Measurements beyond the maximum selected range
must not be attempted.
• Extreme care must be taken when measuring above 50 V,
especially on live bus-bars.
• To measure voltage, the instrument must not be switched
to a current or resistance range, or to the diode check or
buzzer position.
• Circuits must be de-energized and isolated before
carrying out resistance tests.
• The rotary function switch must only be turned after
removing test connections.
• All external voltages must be disconnected from the
instrument before removing the battery.
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• Test leads and prods must be in good order, clean, and
MAX
with no broken or cracked insulation.
• UK Safety Authorities recommend the use of fused test
leads when measuring voltage on high energy systems.
• Replacement fuses must be of the correct type and rating.
• The instrument must not be used if any part of it is damaged.
• Warnings and precautions must be read and understood
before an instrument is used. They must be observed during the operation of this instrument.
Safety used on this instrument are:
Caution: refer to accompanying notes.
This symbol indicates that the operator must refer
to an explanation in the manual to avoid personal
injury or damage to the meter.
Caution: risk of electric shock
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) 1000 VAC or VDC.
Equipment protected throughout by Double
Insulation (Class II)
Equipment complies with current EU directives.
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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 20250-54 only)
4. One 9 V battery
5. Carrying case
6. User manual
7. NIST-traceable calibration report with data
Meter Description (Model 20250-53)
1. NCV detection light
2. LCD with symbols
3. RANGE button
4. REL (Relative) button
5. MODE button
6. Rotary function switch
7. 10A (positive) jack
8. µA/mA jack
9. Hz% button
10. Data HOLD button
11. Backlight button
12. V Ω CAP •))) Hz% jack
13. COM (negative) jack
14. Tilt stand and battery
compartment are on
rear of unit
4
1
9
2
3
4
5
6
7
8
10
11
12
13
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Meter Description (Model 20250-54)
1. NCV detection light
2. LCD with symbols and
analog bar graph
3. Data HOLD button
4. RANGE button
5. MODE button
6. Rotary function switch
7. 10A (positive) jack
1
2
3
4
5
8. µA/mA jack
9. MAX/MIN button
10. PEAK button
11. Backlight button
12. V Ω CAP •))) Hz
Temp jack
6
7
8
13. COM (negative) jack
14. Tilt stand and battery
compartment are on rear of unit
Symbols and Annunciators
Continuity
•)))
Low battery
Diode test
HOLD Data HOLD
AUTO Autoranging
AC Alternating Current or Voltage
DC Direct Current or Voltage
V Volts
A, mA, µA Current range
9
10
11
12
13
14
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Setup and Operation
To turn on the instrument turn the rotary function switch
from the OFF position to any measurement range.
NOTE: For best battery life ALWAYS turn the rotary function
switch to the OFF position when the meter is not in use.
Meter has Auto power-off that automatically shuts the
meter off if 30 minutes elapse between uses.
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.
MODE Button
To select AC or DC measurement when Voltages, Amps,
mA , µA, Ω,
HOLD Button
The Data HOLD function allows the meter to "freeze" a
measurement for later reference.
1. Press the HOLD button to “freeze” the reading on the
display. The indicator “HOLD” will be appear in the
display.
2. Press the HOLD button to resume normal operation.
, •))), CAP, or Hz% are selected.
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