Time Electronics 5068 Ins-Cal User manual

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: [phone] | F: [phone]
[e-mail] | 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.

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5068 Insulation Tester Calibrator User Manual
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Contents
1General Description.......................................................................................................................4
2Supplied Items ...............................................................................................................................5
3Specifications ................................................................................................................................6
3.1 Technical Specification..........................................................................................................................6
3.2 General Specification ............................................................................................................................6
3.3 Ordering Information.............................................................................................................................. 6
4Controls..........................................................................................................................................7
4.1 Descriptions of Controls ........................................................................................................................7
5Operation........................................................................................................................................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
6Warranty and Servicing............................................................................................................... 14

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1General 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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2Supplied 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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3Specifications
3.1 Technical Specification
Insulation Resistance
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)
Spot Value Ω100 kΩ500 kΩ1 MΩ10 MΩ200 MΩ250 MΩ400 MΩ1 GΩ10 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

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4Controls
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 kΩto 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).
Low resistance
connection sockets
4 mm recessed UUT
connection sockets
V/I meter
On/Off button
V/I meter
charging
socket
Voltage/Current
meter
V or I range
selection button
Function selector and
insulation resistance
setting knob

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5Operation
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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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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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.