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20250-60
Instruction Manual
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User manual
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Digi-Sense 20250-60 User manual

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THE STANDARD IN PRECISION MEASUREMENT
User Manual
Insulation Tester
Model 20250-60
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Introduction
The Digi-Sense Insulation Tester (Model 20250-60) is versatile and easy to use. The instrument is a must-have on your electrical tool belt. It safely measures insulation resistance of electrical devices such as cables or motor coils up to 4000 MΩ, as well as providing a means of measuring AC/DC voltages and circuit continuity. Careful use of this meter will provide years of reliable service.
Safety Precautions
•
Read the following safety information carefully before attempting to operate or service the meter.
• To avoid damages to the instrument do not apply the
signals which exceed the maximum limits shown in the technical specifications tables.
• Do not use the meter or test leads if they look damaged.
Use extreme caution when working around bare conductors or bus bars.
• Accidental contact with the conductor could result in
electric shock.
• Use the meter only as specified in this manual; otherwise,
the protection provided by the meter may be impaired.
• Read the operating instructions before use and follow
all safety Information.
• Caution when working with voltages above 60 VDC or
30 VAC RMS. Such voltages pose a shock hazard.
• Before taking resistance measurements or testing
acoustic continuity, disconnect circuit from main power supply and all loads from the circuit.
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Safety Symbols
Caution refer to this manual before using the meter.
Dangerous voltages.
Meter is protected throughout by double insulation or reinforced insulation.
CE Compliance with EN-61010-1 Note: When servicing, use only specified replacement
parts.
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 probes
3. Carrying case
4. Six AA batteries
5. User manual
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Meter Description
750V
1000V
Insulation Tester
400
125V
250V
500V
1000V
TEST
LOBAT
HV
(1)
POL1
(2)
(1)
OHM
BZ
(2)
(2)
POL2
4
(1)
BAR
1
8
5
1
2
3 4
6
7
8
9
10
CEM
DT-5505
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1. Digital display
2. Data Hold button; Max./Min.
3. Lock button
4. Backlight button; Zero
5. Test button
6. Rotary function switch
7. VΩ Jack
8. COM input jack
9. Pothook
10. Battery cover / flip stand
How It Works
How to Connect Test Leads
When the rotary function switch is on MΩ range, 400 Ω/BZ, ACV, or DCV, connect the red test lead into the VΩ terminal and the black lead into the COM terminal.
Test Leads Check
Set the range select switch to the 400 Ω range. With the tip and alligator clip of the test leads connected, the indicator should read 00.0 Ω. When the leads are not connected, the display will read infinity indicated by “OL“. This will ensure that test leads are in good working condition.
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Rotary Function Switch Positions
Turn the tester on by selecting any measurement setting.
HOLD Max/Min Button
Instant-pressing the HOLD button the first time will hold the values at that instant in the primary display. Pressing it a second time will return it to current reading. Pressing and holding the button for 2 seconds will allow reading the MAX value, and an additional instant-pressing will switch it to display the MIN measured value. These can be toggled by instant-pressing the button. To go back to reading current values, press and hold the button again for 2 seconds.
Lock Button Used when testing insulation resistance. Press the
LOCK button and then push down the TEST button.
This will apply the high-voltage source and display the test result. Pressing the TEST button again will shut off the high-voltage and exit from the insulation resistance testing.
Test Button
Used when testing insulation resistance. Pressing the TEST button will apply the high-voltage source and display the test result. Pressing the TEST button again will shut off the high-voltage and exit from the insulation resistance testing.
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Zero/Light Button
Instant-pressing the ZERO/LIGHT button will zero the pri­mary display (mainly used for 400 Ω, the low resistance testing). Instant-pressing the button a second time will return the display to current reading. Pressing and holding the button for 2 seconds will cause the LCD backlight to turn on. Pressing the button again for 2 seconds will cause the backlight to turn off. The backlight will turn off auto­matically after 15 seconds.
Display Descriptions
• Primary display indicates the current function testing
values.
• Secondary display shows the output DCV while you test
the insulation resistance, and the battery voltage while the ACV.
• Analog bar indicates the current function testing value
shown in the primary display.
•
symbol flashes frequently if the voltage is over
30 V when testing the insulation resistance.
• •))) symbol ashes frequently and the buzzer warns
continually if the outside voltage is over 30 V when testing the insulation resistance. This symbol also indicates when resistance measured ≤35 Ω and the buzzer sounds continuously.
• Lock button is pushed down while testing the insulation
resistance and the
• LOBAT shows when the voltage drops below 7.5 V.
symbol is indicated.
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• Max, Min stands for the maximum or the minimum.
• ZERO stands for digital zero adjusting.
• HOLD button is pressed for the primary display.
• AC, DC is the indicator for the voltage property.
• V, MΩ, Ω are the measured dimension units.
Setup and Operation
Insulation Resistance Measurements
1. Turn the function switch from the OFF position to the left
(4000 MΩ/1000 V, 4000 MΩ/500 V, 4000 MΩ/250 V, or 1000 MΩ/125 V) and chose one of the voltage blocks. There are 4 ranges: 4 MΩ, 40 MΩ, 400 MΩ, and 4000 MΩ that can be switched automatically for every voltage block.
2. Connect the test leads to the line to be tested.
3. Push down and hold the TEST button, or press the LOCK keystroke first and then the TEST button. If there is a voltage on the circuit already that is over 30 VAC/DC, the instrument will not apply a source voltage and instead display >30 V on the LCD, the symbol buzzer will sound. If the circuit under test does not have a voltage over 30 V on it, the source voltage will be applied and the insulation resistance in MΩ indicated in the primary display and on the analog bar. On the sec­ondary display, the tested insulation voltage in V (DC) is indicated, the symbol sound.
flashes, and the buzzer will
flashes, and the
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4. The test is completed by letting go of the TEST button or pushing down the TEST button if in the LOCK mode. This will shut off the high-voltage. The test resistance value will be shown in the primary display and held. The secondary display will show the insulation voltage remaining in the circuit.
5. The instrument will discharge the balance of the test voltage automatically through the inner switch of the meter.
6. Turning the rotary function switch will automatically exit from a testing status.
Low Resistance (Continuity) Measurements
1. Set the range switch to 400 Ω/BZ position.
2. Connect the red test lead to the VΩ terminal and black to the COM terminal.
3. Connect the tips of the test leads to both ends of the circuit under test. Read the resistance in Ω on the LCD. The two ranges (40.00 MΩ/400.0 MΩ) can be switched automatically; the resistance in Ω flashes in the primary display and also shows on the analog bar.
4. An impedance on circuit below approximately ≤35 Ω, will be indicated by a continuous beep.
5. The test current of a test resistance at 0Ω is 200 to 220 mA.
6. The high voltage symbol indicates >30 V, and the buzzer sounds if the voltage (AC/DC) is <30 V.
flashes, the primary display
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AC/DC Voltage Measurements
1. Set the range switch to ACV or DCV position.
2. Connect red test lead to VΩ terminal and black test lead to terminal COM.
3. Connect test leads IN PARALLEL to the circuit being
measured.
4. Read the voltage value on LCD.
Battery Saver (Sleep Mode)
The meter will automatically enter the sleep mode if there is no function change or button press for 10 minutes, but exits sleep mode as soon as you turn the rotary function switch or push down any button.
Power Tools and Small Appliances
This test would also apply to other similar equipment that have a line cord. For double insulated power tools, the megohmmeter lead shown connected to the housing would be connected to some metal part of the tool (e.g. chuck, blade).
Note: The switch of the device under test must be in the ON position and the main power should be disconnected.
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Motors AC - Disconnect the motor from the line by disconnecting
the wires at the motor terminals or by opening the main switch. If the main switch is used and the motor also has a starter then the starter must be held, by some means, in the ON position. In the latter case, the measured resistance will include the resistance of the motor, wire and all other components between the motor and the main switch. If a low insulation resistance reading is indicated, the motor and other components should be checked individually. If the motor is disconnected at the motor terminals, connect one megohmmeter lead to the grounded motor housing and the other lead to one of the motor leads.
DC - Disconnect the motor from the line. To test the brush ring field coils and armature, connect one megohmmeter lead to the grounded motor housing and the other lead to the brush on the commutator. If a low insulation resistance reading is indicated, raise the brushes off the commutator and separately test the armature, field coils and brush ring by connecting one megohmmeter lead to each of them individually, leaving the other connected to the grounded motor housing.
Note: The above also applies to DC generators.
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Maintenance and Repair
Repairs or servicing not covered in this manual should only be performed by qualified personnel. Periodically wipe the case with a dry cloth. Do not use abrasives or solvents on this instrument.
Battery Replacement
1. When the battery power is not sufficient for proper operation, the LCD will display batteries need to be replaced. The instrument requires six AA alkaline batteries.
2. Remove the four screws from the batter cover to access and replace the batteries.
indicating that
Specifications
Environment conditions
• Installation categoriesⅢIII
• Pollution degree 2
• Altitude up to 2000 meters
• Indoor use only
• Relative humidity 80% Max.
• Operation ambient 0 to 40ºC
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Specifications (Continued)
Display: Large LCD with dual display Measurement Range: 4000 MΩ/125 V, 4000 MΩ/250 V,
4000 MΩ/500 V, 4000 MΩ/1000 V, 400 Ω/BZ, 1000 V/DCV, 750 V/ACV
Sampling Rate: 2.5 times per second Zero Adjustment: Automatic adjustment Overrange Indicator: “OL“ of highest digit is displayed Low Battery Indication: The
battery voltage drop below the operating voltage
Operating Temperature: 32 to 104ºF (0 to 40ºC) and humidity below 80% RH
Storage Temperature: 14 to 140ºF (-10 to 60ºC) and humidity below 70% RH
Power Source: DC 9 V (six AA batteries or equivalent) Dimensions (L x W x H): 7 Weight: Approx 25 oz (700 g) including battery Electrical Specifications: Accuracies are specified in the
way: ±(% of reading + digits) at 23ºC ± 5ºC, below 80% RH
is displayed when the
7
⁄8" x 35⁄8" x 2" (20 x 9.2 x 5 cm)
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OHMS
Range Resolution Accuracy
40.00 Ω 0.01 Ω
400.0 Ω 0.1 Ω 5.8 V
Continuity Beeper
Range Resolution
•))) 0.01 Ω
Short
circuit
current
DC Voltage
Range Resolution Accuracy
1000 V 1 V ±(0.8% +3) 10 MΩ 1000 Vrms
AC Voltage (40 Hz to 400 Hz)
Range Resolution Accuracy
750 V 1 V ±(1.2% +10) 10 MΩ 750 Vrms
±(1.2% +3)
Operation resistance
Resistance
≤35 Ω
Max. open-circuit
voltage
5.8 V
Max. open-circuit
voltage
5.8 V 250 Vrms
200 mA
Input
impedance
Input
impedance
Overload
protection
250 Vrms
Overload
protection
Overload
protection
Overload
protection
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Meg OHMS
Terminal
voltage
125 V
(0% to +10%)
250 V
(0% to +10%)
500 V
(0% to +10%)
1000 V
(0% to +10%)
Range Resolution Accuracy
0.125 to 4.000 MΩ 0.001 MΩ ±(2% +10)
4.001 to 40.00 MΩ 0.01 MΩ ±(2% +10)
40.01 to 400.0 MΩ 0.1 MΩ ±(4% +5)
400.1 to 4000 MΩ 1 MΩ ±(5% +5)
0.250 to 4.000 MΩ 0.00 1MΩ ±(2% +10)
4.001 to 40.00 MΩ 0.0 1MΩ ±(2% +10)
40.01 to 400.0 MΩ 0.1 MΩ ±(3% +5)
400.1 to 4000 MΩ 1 MΩ ±(4% +5)
0.500 to 4.000 MΩ 0.001 MΩ ±(2% +10)
4.001 to 40.00 MΩ 0.01 MΩ ±(2% +10)
40.01 to 400.0 MΩ 0.1 MΩ ±(2% +5)
400.1 to 4000 MΩ 1 MΩ ±(4% +5)
1.000 to 4.000 MΩ 0.001 MΩ ±(3% +10)
4.001 to 40.00 MΩ 0.01 MΩ ±(2% +10)
40.01 to 400.0 MΩ 0.1 MΩ ±(2% +5)
400.1 to 4000 MΩ 1 MΩ ±(4% +5)
Test
current
1 mA @
load
125 kΩ
1 mA @
load
250 kΩ
1 mA @
load
500 kΩ
1 mA @
load
1 MΩ
Short
circuit
current
≤1 mA
≤1 mA
≤1 mA
≤1 mA
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