ES 550 User manual

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#550 DIGITAL INSULATION TESTER
INSTRUCTIONMANUAL
SAFETY INFORMATION
Read the following safety information carefully before attempting to operate or service the meter.
To avoid damaging the instrument, do not apply signals which exceed the maximum limits shown in the
technical specications 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 specied 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 60V DC or 30V AC 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.
Safety symbols:
Caution refer to this manual before using the meter.
Dangerous voltages.
Meter is protected throughout by double insulation or reinforced insulation.
When servicing, use only speciedreplacement parts.
CE Comply with EN-61010-1
1. SPECIFICATIONS
1-1 General Information
Environment conditions: ①Installation Categories II
②Pollution Degree 2
③Altitude up to 2000 meters
④Indoor use only
⑤Relatively humidity 80% max.
⑥Operation Ambient 0~40ºC
Maintenance& Clearing: ①Repairs orservicing not covered in this
manual should only be performed by qualied personnel.
②Periodicallywipe the case with a dry cloth.Do not use abrasives orsolvents on this
instrument.
Display: Large LCD with dual display
Measurement Range: 200Ω, 200k Ω, 200M Ω/250V, 200MΩ/500V,
2000M Ω/1000V, 750V/ACV, 1000V/DCV.
Sampling Rate: 2.5 times per second.
Zero Adjustment: Automatic adjustment.
Over Range Indicator: Number 1 of highest digit is displayed.
LowBattery Indication: The “ “ symbol is displayed when the battery
voltage becomes too low.
Operating Temperature: 0ºC to 40ºC (32ºF to 104ºF)

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Operating Humidity below 80%RH
Storage Temperature: -10ºC to 60ºC (14ºF to 140ºF)
and Humidity below 70% RH
Power source: DC9V (6x1.5V Size “AA” battery or Equivalent)
Dimensions: 200(L)x 92(W) x 50(H) mm
Weight: Approx 700g include battery
Accessories: Test leads ,6pcs battery, Carrying case, manual.
1-2 Electrical Specications
Accuracies are specied in the way:
±(…% of reading +…digits) at 23ºC ±5ºC,below 80% RH.
OHMS
Range Resolution Accuracy Max. open
Circuit Voltage
Overload
Protection
200 Ω0.1 Ω4.5V
200kΩ0.1k Ω
+(1%+2)
3.0V
250Vrms
Continuity Beeper
Range Resolution Operation
Resistance
Max.openCircuit
Voltage
Overload
Protection
•))) 0.1 ΩResistance ≤40Ω4.5V 250Vrms
Short circuit current ≤200mA
DC Voltage
Range Resolution Accuracy Input Impedance Overload
Protection
1000V 1V + (0.8%+3) 10M Ω1000Vrms
AC Voltage (40Hz~400Hz)
Range Resolution Accuracy Input Impedance Overload
Protection
750V 1V + (1.2%+10) 10MΩ750Vrms
Meg OHMS
Range Resolution Accuracy Terminal Voltage
200M Ω/250V 0.1MΩ250V +10%~-0%
200M Ω/500V 0.1MΩ500V +10%~-0%
0~1000M Ω/1000V
+(3%+5)
1000~2000M Ω
/1000V
1MΩ
+(5%+5)
1000V +10%~-0%
Range Test Current Short circuit current
200M Ω/250V 250KΩ(load)
200M Ω/500V 500 K Ω(load)
0~1000M Ω/1000V
1000~2000M Ω
/1000V
1mA
1MΩ
≤1mA

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+
AA
BATT
BATT
200
TEST
200k
V1000
Ω
Ω
8
4
3
+
+
+
+
AA
AA
AA
+
AA
AA
750 V
2. PARTS & CONTROLS
①Digital Display
②Data Hold Button
③Lock Button
④Backlight Button
⑤Test Button
⑥Rotary Functionswitch
⑦V ΩJack
⑧COM input jack
⑨Pothook
⑩Battery Cover
3. BATTERY REPLACEMENT
3-1 How to connect test leads.
a). On M ΩRange: Connect the red test lead into the “V Ω” terminal and the black lead into the “COM” terminal.
b) On 200 Ωand ACV Range: Connect the red test lead into the “ V Ω” terminal and the black lead into terminal
“COM”
3-2 BatteryCheck-UP & Replacement
a) When battery power is not sucient, LCD will display the low battery symbol. “ “ Replacement of 6 new
batteries, type 1.5V size “AA” is required.
b). Place back the battery cover and four the screws.
3-3 Test leads check
Set the range select switch to the 200Ωrange. 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 innity indicated by “1”. This
will ensure that test lead are in good working condition.
4. INSULATION RESISTANCE MEASUREMENTS
a). Measurements at200M Ω/250V
This is the voltage used for the majority of insulation resistance tests on normal installation requirement. To
measure insulation resistance, press the test button to power on the tester. The LCD will display the insulation
resistance. Section VII indicated that subdivision of large installations might be necessary because of the large
number of parallel insulation resistance.In such a case, an installation may be divided into sections, each being
separately tested. Each section must have not less than fty outlets, an outlet being a switch, socket, lighting
point etc. A switched socket counts as one outlet. The minimum acceptable insulation resistance is 1M Ω.
For a large installation, the capacitance of the insulation will be high, and it will take longer for it to become
charged by the direct testing voltage. Care must be taken not to take a reading until there is a steady reading,

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indicating that the charging process is complete.
Note: The charge stored in the insulation will be discharged automatically when the test button is released.
Be careful not to turn the range switch knob while the test button is pressed, or the instrument will be damaged.
b). Measurements at 2000M Ω/1000V
Some specications require testing at 1000V. This voltage must also be selected where the supply voltage of
the installation is between 500V and 1000V. First, set the range switch to 1000V and then proceed as indicated
in an above 500V test. The above note also applies to testing at1000V. In addition the following applies.
Note: Make sure that the circuit under test does not include components which will be damaged by the applied
1000V. Many normal components of an installation are likely to be damaged if tested at 1000V. Examples are
power factor correction capacitors, low voltage mineral insulated cables, electronic light dimmers, electronic
ballasts and starters for uorescent lamps etc…
c). Lock power on Feature
For hands free operation a lock power on feature is incorporated on the press to test button. Set the LOCK
button to lock test voltage. Pressing it again will switch the LOCK function o.
5. LOW RESISTANCE (CONTINUITY) MEASUREMENTS
a). Set the range switch to the 200 Ωposition.
b). Connect the red test lead to the V Ωterminal and black to the COM terminal.
c). Connect the tips of the test leads to both ends of the circuit under test. Read resistance in Ωon the LCD.
d). When the resistance on the circuit is below approximately 40 Ω, it will be indicated by a continuous beep.
6. AC/DC VOLTAGE MEASUREMENTS
a). Set the range switch to ACV or DCV position
b). Connect red test lead to “ V Ω” terminal and black test lead to terminal “COM”.
b) Connect test prods of test leads IN PARALLEL to the circuit being measured.
c) Read the voltage value on LCD.
7. POWER TOOLS AND SMALL APPLIANCES
This test would also apply to other similar equipment that has a line cord. For double insulated power tools, the
megohmmeter lead shown connected to the housing would be connected to some metal part lf the tool (e.g.
chuck, blade).
Note: The switch of the device must be in the “ON” position and the main power should be disconnected.
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 weakness 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 rigging, eld coils and armature - connect one
megohmmeter lead to the grounded motor housing and the other lead to the brush on the commutator. If the
resistance measurement indicates a weakness, raise the brushes o the commutator and separately test the
armature, eld coils and brush rigging by connecting one megohmmeter lead to each of them individually, leaving
the other connected to the grounded motor housing. The above also applies to DC Generators.

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CABLES
Disconnect the cable from the line. Also disconnect opposite end to avoid errors due to leakage from other
equipment. Check each conductor to ground and /or lead sheath by connecting one megohmmeter lead to a
ground and /or lead sheather and the other megohmmeter lead to each of the conductors in turn. Check
insulation resistance between conductors by connecting megohmmeter leads to conductors in pairs.
For after sale service, please send to:
Electronic Specialties, Inc.
139 Elizabeth Ln.
Genoa City, WI 53128
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