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-toread 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
Resistance, Continuity 250 Vrms for 15 sec max
10 A 250 V fast acting fuse (30 seconds
max every 15 minutes)
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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, resistance, 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, fixtures, 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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3
Safety Symbols
MAX
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 particularly hazardous voltages. For maximum safety,
the meter and its test leads should not be handled when these terminals are energized.
This symbol indicates that a device is protected
throughout by double insulation or reinforced
insulation.
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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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5
3
every
4
15 min.
F
2
10A
COM
MAX
V
RangeMode
Ω
C
μ
μ
C
1
AUTO
DC
AC
REL
F
5
6
7
8
9
Meter Description (Model 20250-50)
1. 2000-count LCD
2. Rotary function switch
1
3. 10 A (positive) jack
4. COM (negative) jack
5. Positive input jack
2
Note: Tilt stand and battery
compartment are on rear
of unit.
3
5
4
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.
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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 contacts 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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5. Touch the black test probe tip to the negative side of
the circuit and then touch the red test probe tip to the
positive side of the circuit.
6. Apply power to the circuit.
7. Read the current in the display. For mA DC measurements, reset the rotary function switch to successively
lower mA DC positions to obtain a higher resolution
reading. The display will indicate the proper decimal
point and value.
Model 20250-51: DC Current Measurement
1. Insert the black test lead banana plug into the negative
COM jack.
2. For current measurements up to 4000 µA DC, set the
rotary function switch to the µA position and insert the
red test lead banana plug into the (µA) jack.
3. For current measurements up to 400 mA DC, set the
rotary function switch to the mA range and insert the
red test lead banana plug into the (mA) jack.
4. For current measurements up to 10 A DC, set the rotary
function switch to the 10A position and insert the red
test lead banana plug into the 10 A jack.
5. Press the MODE button until “DC” appears in the display.
6. Remove power from the circuit under test, then open the
circuit at the point where you wish to measure current.
7. Touch the black test probe tip to the negative side of
the circuit; touch red test probe tip to the positive side.
8. Apply power to the circuit.
9. Read the current in the display. The display will indicate
the proper decimal point, value, and symbol.
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Model 20250-51: AC Current Measurement
WARNING: To avoid electric shock, do not measure
AC current on any circuit whose voltage exceeds
250 VAC.
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 4000 µA AC, set the
rotary function switch to the µA position and insert the
red test lead banana plug into the (µA) jack.
3. For current measurements up to 400 mA AC, set the
rotary function switch to the mA range and insert the red
test lead banana plug into the (mA) jack.
4. For current measurements up to 10 A AC, set the rotary
function switch to the 10A position and insert the red
test lead banana plug into the 10A jack.
5. Press the MODE button until “AC” appears in the display.
6. Remove power from the circuit under test, then open the
circuit at the point where you wish to measure current.
7. 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.
8. Apply power to the circuit.
9. Read the current in the display. The display will indicate
the proper decimal point, value, and symbol.
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Resistance Measurements
WARNING: To avoid electric shock, disconnect power
to the unit under test and discharge all capacitors
before taking any resistance measurements. Remove
the batteries and unplug the line cords.
Model 20250-50:
1. Set the rotary function switch to the highest
2. Insert the black test lead banana plug into the negative
COM jack and insert the red test lead banana plug into
the positive
3. Touch the test probe tips across the circuit or part under
test. It is best to disconnect one side of the part under
test so the rest of the circuit will not interfere with the
resistance reading.
4. Read the resistance in the display and then set the rotary
function switch to the lowest
than the actual or any anticipated resistance. The display
will indicate the proper decimal point and value.
Model 20250-51:
1. Set the rotary function switch to the
2. Insert the black test lead banana plug into the negative
COM jack and the red test lead banana plug into the
positive
3. Touch the test probe tips across the circuit or part under
test. It is best to disconnect one side of the part under
test so the rest of the circuit will not interfere with the
resistance reading.
4. Read the resistance in the display. The display will
indicate the proper decimal point, value, and symbol.
Ω jack.
Ω position that is greater
Ω position.
Ω jack.
Ω position.
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Continuity Check
WARNING: To avoid electric shock, never measure
continuity on circuits or wires that have voltage on
them.
Model 20250-50:
1. Set the rotary function switch to the
2. Insert the black lead banana plug into the negative
COM jack and insert the red test lead banana plug into
the positive
3. Touch the test probe tips to the circuit or wire you wish
to check.
Ω jack.
position.
4. If the resistance is less than approximately 30
Model 20250-51:
1. Set the rotary function switch to the
2. Insert the black lead banana plug into the negative
3. Press the MODE button until the
4. Touch the test probe tips to the circuit or wire you wish
5. If the resistance is less than approximately 30
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audible signal will sound. If the circuit is open, the
display will indicate “1”.
position.
COM jack and the red test lead banana plug into the
positive
the display.
to check.
Ω jack.
symbol appears in
Ω, the
audible signal will sound. The display will also show the
actual resistance.
Ω, the
Diode Test
WARNING: To avoid electric shock, do not test any
diode that has voltage on it.
Model 20250-50:
1. Insert the black test lead banana plug into the negative
COM jack and the red test lead banana plug into the
positive diode jack.
2. Turn the rotary switch to the
3. Touch the test probes to the diode under test. Forward
voltage will indicate 400 to 700 mV. Reverse voltage will
indicate “I”. Shorted devices will indicate near 0 mV and
an open device will indicate “I” in both polarities.
Model 20250-51:
1. Set the rotary function switch to
2. Press the MODE button until the
the display.
3. Insert the black test lead banana plug into the negative
COM jack and the red test lead banana plug into the
positive diode jack.
4. Touch the test probe tips to the diode or semiconductor
junction you wish to test. Note the meter reading.
5. Reverse the probe polarity by switching probe position.
Note this reading.
position
position.
symbol appears in
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Diode Test
Model 20250-51 (continued):
6. The diode or junction can be evaluated as follows:
A. If one reading shows a value and the other reading
shows “OL”, the diode is good.
B. If both readings show “OL”, the device is open.
C. If both readings are very small or 0, the device is
shorted.
NOTE: The value indicated in the display during the diode
check is the forward voltage.
Frequency or % Duty Cycle Measurements
(Model 20250-51 only)
1. Set the rotary function switch to the Hz% position.
2. Insert the black lead banana plug into the negative
COM jack and the red test lead banana plug into the
positive Hz jack.
3. Press the MODE button to select “Hz” or “%”.
4. Touch the test probe tips to the circuit under test.
5. Read the frequency or % of duty cycle on the display.
Capacitance Measurement (Model 20250-51 only)
WARNING: To avoid electric shock, disconnect power
to the unit under test and discharge all capacitors
before taking any capacitance measurements. Remove
the batteries and unplug the line cords.
1. Set the function switch to the CAP position. “nF” and a
small value will appear in the display.
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2. Insert the black test lead banana plug into the negative
COM jack and the red test lead banana plug into the
positive CAP jack.
3. Touch the test leads to the capacitor to be tested. The
display will indicate the proper decimal point, value, and
symbol.
Temperature Measurement (Model 20250-51 only)
WARNING: To avoid electric shock, disconnect both
test probes from any source of voltage before making a temperature measurement.
1. If you wish to measure temperature in °F, set the rotary
function switch to the Temp °F range. If you wish to
measure temperature in °C, set the rotary function
switch to the Temp °C range.
2. 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.
3. Touch the temperature probe head to the part whose
temperature you wish to measure. Keep the probe
touching the part under test until the reading stabilizes
(about 30 seconds).
4. Read the temperature in the display. The digital reading
will indicate the proper decimal point and value.
WARNING: To avoid electric shock, be sure the
thermocouple has been removed before changing to
another measurement function.
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MODE Button (Model 20250-51 only)
To select DC/AC, Diode/Continuity, or Hz/%Duty functions.
RANGE Button (Model 20250-51 only)
When the meter is first turned on, it automatically defaults
to Autoranging. This automatically selects the best range
for the measurements being made and is generally the
optimal mode for most measurements. For measurement
situations requiring that a range be manually selected,
perform the following:
1. Press the RANGE button. The “AUTO” display
indicator will turn off.
2. Press the RANGE button again to step through the
available ranges until you select the range you want.
3. Press and hold the RANGE button for 2 seconds to exit
the manual ranging mode and return to autoranging.
Data HOLD Button (Model 20250-51 only)
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 again to resume normal
operation.
REL Button (Model 20250-51 only)
The relative measurement feature allows you to make
measurements relative to a stored reference value.
A reference voltage, current, etc., can be stored and
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measurements made in comparison to that value. The
displayed value is the difference between the reference
value and the measured value.
1. Perform any measurement as described in the manual.
2. Press the RELATIVE button to store the reading in the
display and the "REL" indicator will appear on the
display.
3. The display will now indicate the difference between
the stored value and the measured value.
4. Press the RELATIVE button again to resume normal
operation.
Battery Test (Model 20250-50 only)
1. Insert the black test lead banana plug into the negative
COM jack and the red test lead banana plug into the
positive V jack.
2. Set the rotary function switch to the 1.5 V BATT or
9 V BATT position.
3. Connect the red test lead to the positive side of the
battery and the black test lead to the negative side of
the battery.
4. Read the voltage in the display and use guidelines:
Type Good Weak Bad
9 V battery >8.2 V 7.2 to 8.2 V <7.2 V
1.5 V battery >1.35 V 1.22 to 1.35 V <1.22 V
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Specifications
Accuracy is given at 65 to 83°F (18 to 28°C), less
than 70% RH.
DC Voltage (Autoranging for model 20250-51 only)
Range Resolution Accuracy
20250-50 20250-51 20250-50 20250-51 20250-50 20250-51
200 mV 400.0 mV 0.1 mV 0.1 mV
2000 mV 4.000 V 1 mV 1 mV
20 V 40.00 V 10 mV 10 mV
200 V 400.0 V 100 mV 100 mV
600 V 600 V 1 V 1 V
Input impedance: 7.8 MΩ
Maximum input: 600 V DC or 600 V AC RMS
AC Voltage
(Autoranging, except 400 mV, for model 20250-51 only)
Range Resolution Accuracy
20250-50 20250-51 20250-50 20250-51 20250-50 20250-51
— 400.0 mV — 0.1 mV —
— 4.000 V — 1 mV —
40.00 V — 10 mV —
200.0 V 400.0 V 100 mV 100 mV
600 V 600 V 1 V 1 V
Input impedance: 7.8 MΩ
Frequency range: 50 to 60 Hz (20250-50), 50 to 400 Hz (20250-51)
Maximum input: 600 V DC or 600 V AC RMS
±(0.5% rdg
+ 2 dgts)
±(0.5% rdg
+ 2 dgts)
±(0.5% rdg
+ 2 dgts)
±(0.8% rdg
+ 2 dgts)
±(0.8% rdg
+ 2 dgts)
±1.2% rdg
+ 10 dgts
+0.5% rdg
+ 2 dgts
+1.2% rdg
+ 2 dgts
+1.5% rdg
+ 2 dgts
±1.5% rdg
± 15 dgts
±1.2% rdg
± 3 dgts
±1.5% rdg
± 3 dgts
±2.0% rdg
± 4 dgts
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DC Current
(Autoranging, µA and mA, for model 20250-51 only)
Range Resolution Accuracy
20250-50 20250-51 20250-50 20250-51 20250-50 20250-51
— 400.0 µA — 0.1 µA —
2000 µA 4000 µA 1 µA 1 µA
20.00 mA 40.00 mA 10 µA 10 µA
200.0 mA 400.0 mA 100 µA 100 µA
10 A 10 A 10 mA 10 mA
±1.0% rdg
+ 2 dgts
±1.2% rdg
+ 2 dgts
±2.0% rdg
+ 2 dgts
±1.0% rdg
± 3 dgts
±1.5% rdg
± 3 dgts
±2.5% rdg
± 5 dgts
Overload protection (20250-50): 0.2 A / 250 V and 10 A / 250 V fuse
Overload protection (20250-51): 0.5 A / 250 V and 10 A / 250 V fuse
Maximum input (20250-50): 200 mA DC on µA / mA ranges,
10 A DC on 10 A range
Maximum input (20250-51): 400 mA DC or 400 mA AC RMS on
µA / mA ranges, 10 A DC or AC RMS on 10 A range
AC Current for model 20250-51 only
(Autoranging for µA and mA)
Range Resolution Accuracy
400.0 µA 0.1 µA ±1.5% rdg ± 5 dgts
4000 µA 1 µA
400.0 mA 100 µA
10 A 10 mA ±3.0% rdg ± 7 dgts
Overload protection: 0.5 A / 250 V and 10 A / 250 V fuse
Frequency range: 50 to 400 Hz
Maximum input: 400 mA DC or 400 mA AC RMS on
µA / mA ranges, 10 A DC or AC RMS on 10 A range
±1.8% rdg ± 5 dgts40.00 mA 10 µA
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Resistance (Autoranging for model 20250-51 only)
Range Resolution Accuracy
20250-50 20250-51 20250-50 20250-51 20250-50 20250-51
200.0 Ω 400.0 Ω 0.1 Ω 0.1 Ω
2.000 kΩ 4.000 kΩ 1 Ω 1 Ω
20.00 kΩ 40.00 kΩ 10 Ω 10 Ω
200.0 kΩ 400.0 kΩ 100 Ω 100 Ω
2.000 MΩ 4.000 MΩ 1 kΩ 1 kΩ
— 40.00 MΩ — 10 kΩ —
±0.8% rdg
+ 2 dgts
±0.8% rdg
+ 2 dgts
±0.8% rdg
+ 2 dgts
±0.8% rdg
+ 2 dgts
±1.0% rdg
+ 2 dgts
±1.2% rdg
±1.0% rdg
±1.2% rdg
±2.0% rdg
Input protection: 250 V DC or 250 V AC RMS
Capacitance for model 20250-51 only (Autoranging)
Range Resolution Accuracy
4.000 nF 1 pF ±5.0% rdg ± 50 dgts
40.00 nF 10 pF ±5.0% rdg ± 7 dgts
400.0 nF 0.1 nF
40.00 µF 10 nF
200.0 µF 0.1 µF ±5.0% rdg ± 5 dgts
±3.0% rdg ± 5 dgts4.000 µF 1 nF
Input protection: 250 V DC or 250 V AC RMS
Frequency for model 20250-51 only (Autoranging)
Range Resolution Accuracy
9.999 Hz 0.001 Hz
99.99 Hz 0.01 Hz
999.9 Hz 0.1 Hz
9.999 kHz 1 Hz
99.99 kHz 10 Hz
999.9 kHz 100 Hz
9.999 MHz 1 kHz ±1.5% rdg ± 4 dgts
Sensitivity: >0.5 V RMS while ≤1 MHz; >3 V RMS while >1 MHz
Overload protection: 250 V DC or AC RMS
±1.5% rdg ± 5 dgts
±1.2% rdg ± 3 dgts
± 4 dgts
± 2 dgts
± 2 dgts
± 3 dgts
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Duty Cycle for model 20250-51 only
Range Resolution Accuracy
0.1 to 99.9% 0.1% ±1.2% rdg ± 2 dgts
Pulse width: >100 µs, <100 ms
Frequency width: 5 Hz to 150 kHz
Sensitivity: >0.5 V RMS
Overload protection: 250 V DC or AC RMS
Temperature for model 20250-51 only
Range Resolution Accuracy
–4 to +1400°F 1°F
–20 to +760°C 1°C
±3% rdg ± 9°F/5°C
Sensor: type K thermocouple
Overload protection: 250 V DC or AC RMS
Diode Test for both models 20250-50 and 20250-51
Test current Resolution Accuracy
0.3 mA typical 1 mV ±10% rdg ± 5 dgts
Open circuit voltage: 1.5 V DC typical
Overload protection: 250 V DC or AC RMS
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Audible Continuity
Audible threshold (20250-50): less than 30; Test current: <1 mA
Audible threshold (20250-51): less than 150; Test current: <0.3 mA
Overload protection: 250 V DC or AC RMS
Compliance: EN61010-1
Insulation: Class 2, Double insulation
Overvoltage category: CAT III 600 V
Display: 2000 count (20250-50), 4000 counts (20250-51) LCD with
function indication
Polarity: Automatic, (–) negative polarity indication
Overrange indication: “1” displayed (20250-50),
“OL” displayed (20250-51)
Low-battery indication: “BAT” displayed
Measurement rate: 2 times per second, nominal
Operating environment: 32 to 122°F (0 to 50°C) at <70% RH
Storage temperature: –4 to 140°F (–20 to 60°C) at <80% RH
For inside use, max height: 7000 ft (2000 m)
Power: One 9 V alkaline battery
Auto power-off: Approximately after 15 minutes of inactivity
(model 20250-51 only)
Weight: 9 oz (255 g)
Dimensions: 5
7
⁄8" x 23⁄4" x 17⁄8" (15 x 7 x 4.8 cm)
Safety: For indoor use and in accordance with Overvoltage
Category II, Pollution Degree 2. Category II includes local level,
appliance, portable equipment, etc., with transient overvoltages
less than Overvoltage Category III.
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Maintenance, Recalibration, and Repair
Cleaning and Storage
• The meter should be cleaned with a damp cloth and
mild detergent when necessary. Do not use solvents or
abrasives.
• Store the meter in an area with moderate temperature
and humidity.
Battery Replacement
WARNING: To avoid electric shock, disconnect the
test leads from any source of voltage before removing the battery door.
1. When the batteries become exhausted or drop below the
operating voltage, “BAT” will appear in the right-hand
side of the LCD. The battery should be replaced.
2. Disconnect the test leads from the meter.
3. Open the battery door by loosening the screw using a
Phillips head screwdriver.
4. Insert the battery into battery holder, observing the
correct polarity.
5. Put the battery door back in place. Secure with the two
screws.
6. Dispose of the old battery properly.
WARNING: To avoid electric shock, do not operate
your meter until the battery door is in place and
fastened securely.
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Notes . . .
26
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Notes . . .
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It is recommended that Digi-Sense products are calibrated
annually to ensure proper function and accurate measure-
ments; however, your quality system or regulatory body
may require more frequent calibrations.
To schedule your recalibration, please contact InnoCal,
an ISO 17025 calibration laboratory accredited by A2LA.
Phone: 1-866-INNOCAL (1-866-466-6225)
Fax: 1-847-327-2993
E-mail: sales@innocalsolutions.com
Web: InnoCalSolutions.com
For Product and Ordering Information, Contact:
Toll-Free: 1-800-323-4340
Phone: 1-847-549-7600
Fax: 1-847-247-2929
ColeParmer.com/Digi-Sense
1065DGMAN_20250-50, -51
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Toll-Free: 1-800-358-5525
Phone: 1-847-327-2000
Fax: 1-847-327-2700
Davis.com/Digi-Sense
Manual Part No. 00101-86
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