User Manual

5068 InsCal
Insulation Tester Calibrator

Version 2.5
11-22

Time Electronics Ltd

Unit 5, TON Business Park, 2-8 Morley Road,
Tonbridge, Kent, TN9 1RA, United Kingdom.
T: +44 (0) 1732 355993 | F: +44 (0) 1732 350198
mail@timeelectronics.co.uk | www.timeelectronics.com
© 2022 Time Electronics Ltd.
All rights reserved.
Nothing from this manual may be multiplied, or made public in any form or manner, either
electronically or hard copy, without prior written consent from Time Electronics Ltd.
This also applies to any schematics, drawings and diagrams contained herein.

This manual provides operating and safety instructions for the Time Electronics product.
To ensure correct operation and safety, please follow the instructions in this manual.
Time Electronics reserves the right to change the contents, specifications and other
information contained in this manual without notice.
Time Electronics
5068 Insulation Tester Calibrator User Manual

Contents
1 General Description....................................................................................................................... 4
2 Supplied Items ............................................................................................................................... 5
3 Specifications ................................................................................................................................ 6
3.1 Technical Specification .......................................................................................................................... 6
3.2 General Specification ............................................................................................................................ 6
3.3 Ordering Information .............................................................................................................................. 6

4 Controls .......................................................................................................................................... 7
4.1 Descriptions of Controls ........................................................................................................................ 7

5 Operation........................................................................................................................................ 8
5.1 Operational Guidelines .......................................................................................................................... 8
5.2 Typical Operation Procedure ................................................................................................................. 9
5.2.1 Initial Setup ........................................................................................................................................................ 9
5.2.2 Voltage Measurement...................................................................................................................................... 10
5.2.3 Current Measurement ...................................................................................................................................... 11
5.2.4 Insulation Resistance Verification .................................................................................................................... 12
5.2.5 Example Connection........................................................................................................................................ 13
5.2.6 Low Resistance Verification............................................................................................................................. 13

6 Warranty and Servicing............................................................................................................... 14

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Time Electronics
5068 Insulation Tester Calibrator User Manual

1 General Description

This 5068 provides all the equipment necessary to test and calibrate insulation test sets and
megohm meters. It consists of:

• 9 high precision selectable spot insulation resistances.

• 4 low resistance spot values.
• A continuity test function.
• A dual range voltmeter.
• A dual range milliamp meter.
It is constructed from very high insulation materials, including its case and is fully isolated
from any external circuits including the mains supply.
The switch in the insulation resistance selection circuit is constructed from special high
voltage low leakage wafers and are self-cleaning, so should require no maintenance.
The insulation test section of the instrument, including the leads provided have been tested
for safety up to 2.5 kilovolts. The maximum safe voltage is limited by any probes or
connectors the end user may fit.
The insulation sections of the instrument may be used separately but the user must be
aware that they have a common earth which will prohibit two of the sections being used in
the same circuit. The low resistance section is independent.

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5068 Insulation Tester Calibrator User Manual

2 Supplied Items
5068 InsCal Insulation Tester Calibration System

Accessories supplied:
Test Lead Wallet Low resistance test leads 2.5 kV test leads Battery charger

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5068 Insulation Tester Calibrator User Manual

3 Specifications
3.1 Technical Specification
Insulation Resistance

Spot Value Ω 100 kΩ 500 kΩ 1 MΩ 10 MΩ 200 MΩ 250 MΩ 400 MΩ 1 GΩ 10 GΩ

Accuracy ±1% ±1% ±1% ±1% ±1% ±1% ±1% ±1% ±5%

Max Voltage 500 V 500 V 1 kV 1 kV 1 kV 1 kV 1 kV 1 kV 2.5 kV

Temp. Coefficient 250 ppm

Switches are a purpose-built design, with break-before-make, silver plated, self-cleaning contacts.

Low Resistance
4 spot values ............... 1 Ω, 10 Ω, 100 Ω and 1 kΩ, 1 %, 0.5 W, TC 50 ppm.

Volt-Meter
Low Range ................. 0 to 1.999 kV, resolution 1 V; 1 % of full-scale reading.
High Range ................. 0 to 2.5 kV, resolution 10 V; 1 % of full-scale reading.
At 2.5 kV the humidity limit should be below 50%.
Terminal impedance ... 1 GΩ.

Milli-Amp Meter
Low Range ................. 0 to 2 mA; 1 % of full-scale reading.
High Range ................. 0 to 20 mA; 1 % of full-scale reading.
Terminal impedance ... 447 Ω (this includes the discharge resistor for short circuit test).

3.2 General Specification

Power .......................... Internal battery, 6 V re-chargeable NiMH, >150hrs between charges.
Dimensions/Weight ..... W 270 x H 175 x D 246 mm / 2.1 kg.
Supplied with............... High voltage safety connection leads (2.5 kV). Low resistance leads.
Mains battery re-charger (230 V 50 Hz).

3.3 Ordering Information

5068 ............................ Insulation Tester Calibrator (InsCal)
C189 ........................... Traceable calibration certificate (Factory)
C112 ........................... Accredited calibration certificate (ISO 17025)

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Time Electronics
5068 Insulation Tester Calibrator User Manual

4 Controls
V/I meter Function selector and
Voltage/Current V or I range
charging insulation resistance
meter selection button
socket setting knob

V/I meter
On/Off button

4 mm recessed UUT Low resistance

connection sockets connection sockets

4.1 Descriptions of Controls

• On/Off Button: To power the voltage/current meter on or off.
• Charging socket. A socket to recharge the 5068 voltage/current meter.
• Voltage/Current meter: Displays the O/C voltage or S/C current when used.
• V or I range Selection button: Select the range to use for the V or I measure function.
• Function selector and insulation resistance setting knob: Use to select the required
function or the insulation resistance spot values from 100 kΩ to 10 GΩ.
• Low resistance connection sockets: Spot values used individually: 1Ω, 10Ω, 100Ω, 1 kΩ.
• 4 mm Recessed Sockets: Used to connect the 5068 to the insulation tester (UUT).

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Time Electronics
5068 Insulation Tester Calibrator User Manual

5 Operation
5.1 Operational Guidelines
Notes:
1. UUT: stands for Unit Under Test (i.e. the insulation tester or the megohm meter).
2. Wherever possible use the manufacturer of the UUT’s supplied test leads.

The 5068 can measure test voltages generated by a UUT up to 2.5 kV.
Be aware that the test voltage for high resistance measurements is dangerous and can
cause electric shock!

Always remove the battery charger leads from both the 5068 and the UUT before
starting the calibration setup.

Use only the measuring leads supplied with the UUT or those supplied with the 5068.
When checking high resistance values the leads may pick up electrical interference,
which can cause a disturbance to the readings obtained. Some manufactures fit a
guard connection for use with dedicated leads, this will stabilise the readings.

It is not recommended to operate the resistance dial switch while a test is made. This
will not automatically do any damage but may cause arcing and create transients which
could give false readings on the UUT display due to the fact that the switch is break-
before-make between each resistor. This will ensure that contact arc is suppressed
with high relative humidity.

Avoid opening the 5068 case lid in the rain or in steamy conditions for the moisture
will impair the readings.

Observe safety at all times and if possible, carry out the tests in a low humidity
environment.

Note: Insulation testers will vary, and the controls may be different than those referenced in this manual.
However, the testing principles should still apply.

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5068 Insulation Tester Calibrator User Manual

5.2 Typical Operation Procedure

5.2.1 Initial Setup
1) Check the battery on both 5068 V/I Meter and Insulation Tester.
Make sure their batteries are fully charged.

2) Complete the setup procedure for the insulation tester (UUT).

3) Connect the selected test leads to the 4 mm recessed sockets of the 5068.

NOTE: If the UUT’s own test leads are available, use them as first choice.

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5068 Insulation Tester Calibrator User Manual

5.2.2 Voltage Measurement

The 5068 voltmeter will display the voltage output from the insulation tester.
Perform the following procedure to measure the voltage.
1) Adjust the pointer at zero on the UUT (Analogue meter display, if required).

2) On the 5068, select the O/C VOLTS function using the rotator knob.

3) Using range selection button under the display, choose the required
voltage range of 1.999 kV or 2.50 kV.

4) Using the selected high voltage test leads, connect the 5068 to the UUT, observing their
polarities.

5) Select voltage range on UUT, and press the test button.

6) When the reading has stabilised, record the O/C voltage reading on the 5068 voltmeter.

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Time Electronics
5068 Insulation Tester Calibrator User Manual

5.2.3 Current Measurement

The 5068 current meter will display the equivalent current output of the Insulation tester.
Perform the following procedure to measure the current.

1) On the 5068, select the S/C CURRENT function using the rotator knob.

2) Using range selection button under the display, choose the required
current range: 2 mA or 20 mA.

3) Press the test button on the UUT, and record the current reading on the 5069 display.
Ensure the output of the UUT is turned off after test.

4) Return the 5068 setting to O/C Voltage, and repeat the Voltage Measurement
procedure above (5.2.2). This is to check the voltage has recovered. Switch off the
output from the UUT.

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5068 Insulation Tester Calibrator User Manual

5.2.4 Insulation Resistance Verification

Note: The O/C V and S/C I display can be turned off when using the resistance function to conserve
the meter battery life.

1. Using the rotator knob of 5068, select the required Resistance Spot value.

2. Note the allowed voltage of the spot value resistances shown on the 5068 panel.

Ensure that the voltage set on the UUT does not exceed this voltage rating.

Important Note: Wherever possible use the test leads supplied with the UUT.

5) Press the test button on the UUT. Please note on the higher resistance ranges, due to
the very low currents present, the display on the UUT may fluctuate and take time to
settle, please follow any precautions given by the tester manufacturer.

6) Proceed and record all test results, noting the allowed errors of the 5068 and also for
that of the UUT.

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5068 Insulation Tester Calibrator User Manual

5.2.5 Example Connection

5.2.6 Low Resistance Verification

Using the Low Resistance section of the 5068 in conjunction with the supplied low voltage
test lead set, the continuity feature of the UUT can be tested and verified.
The low resistance accuracy of the UUT can also be verified.
Connect the UUT to the low resistance terminals to test set point values at 1, 10, 100, 1 kΩ

Please note that the power dissipation of these resistors is limited to 0.5 W.

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Time Electronics
5068 Insulation Tester Calibrator User Manual

6 Warranty and Servicing

Warranty
The Time Electronics products carry a one-year manufacturer’s warranty as standard.
Time Electronics products are designed and manufactured to the highest standards and
specifications to assure the quality and performance required by all sectors of industry.
Time Electronics products are fully guaranteed against faulty materials and workmanship.
Should this product be found to be defective, please contact us using the below details.
Inform us of the product type, serial number, and details of any fault and/or the service
required. Please retain the supplier invoice as proof of purchase.
This warranty does not apply to defects resulting from action of the user such as misuse,
operation outside of specification, improper maintenance or repair, or unauthorized
modification. Time Electronics’ total liability is limited to repair or replacement of the product.
Note that if Time Electronics determine that the fault on a returned product has been caused
by the user, we will contact the customer before proceeding with any repair.

Calibration and Repair Services

Time Electronics offers repair and calibration services for all the products we make and sell.
Routine maintenance by the manufacturer ensures optimal performance and condition of the
product. Periodic traceable or accredited calibration is available.

Contacting Time Electronics

Online:
Please visit www.timeelectronics.com and select Support Request from the Contact links.
From this page you will be able to send information to the Time Electronics service team
who will help and support you.
By phone:
+44 (0) 1732 355993
By email:
mail@timeelectronics.co.uk

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Time Electronics
5068 Insulation Tester Calibrator User Manual

Returning Instruments
Prior to returning your product please contact Time Electronics. We will issue a return
merchandise authorization (RMA) number that is to accompany the goods returning.
Further instructions will also be issued prior to shipment. When returning instruments, please
ensure that they have been adequately packed, preferably in the original packing supplied.
Time Electronics Ltd will not accept responsibility for units returned damaged.
Please ensure that all units have details of the service required and all relevant paperwork.

Send the instrument, shipping charges paid to:

Time Electronics Ltd

Unit 5, TON Business Park, 2-8 Morley Road,
Tonbridge, Kent, TN9 1RA.
United Kingdom.

Tel: +44(0)1732 355993

Fax: +44(0)1732 350198

Email: mail@timeelectronics.co.uk
Web Site: www.timeelectronics.com

Disposal of your old equipment

1. When this crossed-out wheeled bin symbol is attached to a product it means the product is
covered by the European Directive 2002/96/EC.
2. All electrical and electronic products should be disposed of separately from the municipal
waste stream via designated collection facilities appointed by the government or the local
authorities.
3. The correct disposal of your old appliance will help prevent potential negative consequences
for the environment and human health.
4. For more detailed information about disposal of your old appliance, please contact your city
office, waste disposal service or return to Time Electronics.

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