Aegis CZ20055 User manual

INSULATION TESTER
User Guide
CZ20055
Insulation Tester
V
0-ADJ
0
0
0
50
V
V
CZ20055-DRW02-01

1
SAFETY INFORMATION
Read the following safety information carefully before attempting
to operate or service the meter.
To avoid damage to the instrument do not apply voltages that
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 60V DC or 30V AC
RMS. Such voltages pose a shock hazard.
Before taking resistance measurements or testing continuity,
disconnect circuit from main power supply and all loads from the
circuit.

2
Safety symbols:
Caution refer to this manual before using the meter.
Dangerous voltages.
Meter is protected throughout by double insulation or
reinforced insulation.
CE Comply with EN-61010-1
When servicing, use only specified replacement parts.
1. SPECIFICATIONS
1-1General 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 & Cleaning:
①Repairs or servicing not covered in this manual should only be
performed by qualified personnel.
②Periodically wipe the case with a dry cloth. Do not use
abrasives or solvents on this instrument.

3
Measurement Range 3Ω, 500Ω, 20MΩ/50V,
40MΩ/100V,200MΩ/500V, 600V/ACV,
Operating Temperature: 0ºC to 40ºC (32ºF to 104ºF) and 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.
1-2Electrical Specifications
Accuracies are specified as:
±(…% of reading +…digits) at 23ºC±5ºC,below 80% RH.
OHMS
Range
Resolution
Accuracy
MIN. open
Circuit
Voltage
MIN circuit
current
3Ω
0.05Ω
+3%
4.1V
200mA
500Ω
1Ω
4.1V

4
AC Voltage (40Hz~400Hz)
Range
Resolution
Accuracy
Input Impedance
Overload
Protection
600V
20V
+5%
1.2MΩ
600Vrms
Meg OHMS
Range
+5%
+10%
Terminal Voltage
100MΩ/250V
250KΩ~5MΩ
5MΩ~100MΩ
250V+10%~-0%
200MΩ/500V
0.5MΩ~10MΩ
10MΩ~200MΩ
500V+10%~-0%
400MΩ/1000V
1MΩ~200MΩ
20MΩ~400MΩ
1000V+10%~-0%
Range
Test Current
Short circuit current
100MΩ/250V
1mA
250KΩ(load)
About 1.3mA
200MΩ/500V
500KΩ(load)
400MΩ/1000V
1MΩ(load)

5
2. PARTS & CONTROLS
①Point needle
②Battery check Button
③0-Adjust Button
④Backlight Button
⑤Test Button
⑥Rotary Function switch
⑦VΩ Jack
⑧COM input jack
⑨Belt hook
⑩Battery Cover
10
9
1
2
3
4
5
6
78
Insulation Tester
V
0-ADJ
V
V

6
3. Operational Guidelines
1. Before using this tester, always read the safety warnings and
test methods described in the instruction manual thoroughly and
completely.
1-1. Set the range selector switch to the “BATT.CHECK” position
，press “TEST” Button and “Batt.check” Button make certain that
the meter pointer stays in the “BATT. GOOD” area.
1-2. Without pressing the test button, connect the test leads to the
instrument and set the range selector switch to the desired range
position. When making continuity tests (3Ω and 500Ω ranges), short
the test leads first, then press the test button and adjust the ohms
ADJ dial to zero the reading.
2. Testing
DANGER! Before testing, make certain that the circuit under
test is NOT live. Testing on a live circuit may cause damage
to the instrument and pose a shock hazard to the user

7
(1) Check for Dead
Circuit (Voltage Warning)
Test Button
OFF
(Up position)
Live circuit warning lamp
lights up and beeper
sounds where the circuit
is LIVE. Without pressing
the test button connect the
test leads to the circuit
under test. If there is an
AC voltage present the
pointer will deflect to
indicate the value in
addition to the above
warnings.
(2) Insulation & Continuity
Testing
ON Read insulation resistance
and continuity on the
Megohm and ohm scales
appropriate for the range
switch position selected
(ohm zero adjust before
continuity testing). Read
directly for 500V insulation
range, multiply by 0.5 for
250V range and multiply
by 2 for 1000V range.

8
(3) Discharging
Capacitance in Circuit
Tested
OFF Be aware of any
capacitance charged up in
the circuit immediately after
insulation testing. This is
very dangerous. With the
test leads connected to the
circuit, release the test
button. Any charge on the
circuit will be discharged.
This will be seen as the
pointer on the volts scale
moves to the zero position.

9
4. Battery Replacement
1, When the battery is low ,the six 1.5V ‘AA’ batteries must be
replaced.
2, Turn the meter off and remove the test leads
3, Unsnap the tilt stand from the rear of the meter
4, Remove the four Phillips head screws holding the battery cover
5, Remove the battery compartment cover
6, Replace the batteries observing polarity
7, Attach the rear cover and secure the screws.
8, Reattach the tilt stand

10
5. Contact Details
Australia
Aegis
Unit 9, 173-181 Rooks Road
Vermont Victoria 3133
Tel [phone]
[e-mail]
www.aegis.net.au
New Zealand
Aegis Instruments
Suite 103, 6 Leonard Isitt Drive
Level 1, Quad 7
Auckland Airport, 2022, New Zealand
Tel [phone]
[e-mail]
www.aegis.net.nz