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www.kewtechcorp.com
KTD30
Digital Insulation and
Continuity Tester
User Manual
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Caution
Before using your KTD30 please read these instructions; in particular note the safety
issues that follow:
Your tester is for use on dead circuits only. Although your Kewtech instrument is fully
protected against accidental connection to a live circuit it is essential to check the
circuit is dead before working on it.
Your tester is equipped with a very convenient auto test (hands free) feature but do not
touch the lead tips when using this feature.
There may be capacitance on the circuit being tested (a longer than normal test time
will indicate this condition). Your tester will automatically discharge this but do not
disconnect the test leads until this auto discharge has completed.
On the subject of test leads, always check for damaged leads or croc clips - Kewtech
replacement lead sets are inexpensive and easy to obtain.
The continuity circuit is fuse protected against accidental connection to mains (unlikely
as there will be a warning to indicate a live circuit) - if this fuse does blow replace it
with the correct type F 500mA fast blow ceramic 500V. It is located inside the battery
compartment.
BS EN 61010-1
Batteries
Because of storage issues your tester is not supplied with batteries.
ALWAYS REMOVE THE TEST LEADS BEFORE REPLACING BATTERIES.
Just 4 AA cells are required (alkaline recommended). The battery compartment is at the
the back of the instrument, remove the screw (do not lose it) – slide the battery cover
off and carefully insert the batteries observing correct polarity. Replace cover and fix
screw back in. 4 good quality AA alkaline cells should give 5000 tests at 500V DC.
Note: Access to the protective fuse is also gained through the battery compartment.
Always replace with the correct type – F 500mA Fast Blow Ceramic 500V.
Operation – a Detailed View of the KTD30
1 Live Circuit
2 LCD Display
3 Power ON/OFF
(including
Intelligent Auto
Power Off)
6 Continuity Test
5 Insulation Test
Voltage 250V
500V 1000V
4 Insulation Test
7 Continuity Test
Lead Null
8 Briefly Pust to Test
(Instant) plus Push and
Hold for 2 seconds for
Auto Test (Hands Free)
The Kewtech KTD30 Loop Impedence Tester is designed for use by suitably
qualified personnel familiar with electrical supply systems.
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This is how the display will look when you first power up the instrument.
3 Power ON/OFF – Pressing and releasing this button turns the KTD30 on –
holding down for longer than 2 seconds turns the unit off (plus Auto Power Off is
incorporated).
4 This button selects Insulation Testing Mode (your KTD30 defaults to Insulation Test
500V DC on Power On).
5 This allows selection of insulation test voltage 250V DC for SELV and PELV circuits
500V DC (default) for circuits up to and including 500V and 1000V for circuits
abouve 500V
(SELV = Separated Extra-Low Voltage. PELV = Protective Extra-Low Voltage).
6 Selects Continuity Test Mode.
7 Continuity Test Lead NULL – In order to give accurate continuity resistance results
your tester will record the resistance of the test leads – store it and automatically
subtract the stored value from any continuity measurement being made. To NULL
the leads hold the test lead tips together very firmly with one hand and press the
NULL Button – the result will be displayed – continuity testing will then subtract this
stored value whenever Test Button 8 is pressed – the value is reset to zero after
Power OFF (or Auto Power OFF) is selected.
8 The Push To Test Button performs two functions:
A brief push (less than one second) initiates the test and automatically captures the
result (which stays on screen until the next test, Power OFF or Mode change). For
Auto Test the button is held down for longer than 2 seconds at which point is
displayed in the LCD – you now have Hands Free – when the probes are touched
onto any two test points your KTD30 will carry out an automatic test and capture
the result for as long as the probes are held in contact.
A brief push on the Test button unlocks Hands Free mode.
Overview of the Display
A Fuse Broken DO NOT PROCEED
B > Greater Than / < Less Than
C Battery Condition = good. = 1/2. Flashing = replace.
D TestMode – CERT – Certification
E Measuring Mode – INS – Insulation or CONT – Continuity
F Insulation DC Volts Test Voltage – 250 – 500-1000V DC
G Measuring Units – MΩ – Insulation – Ω – Continuity
H Null Function – (Continuity only) Nulls and stores Ohms value of the test
leads for the testing session you are in (automatically resets to zero on
switch off)
I AutoTest (Hands Free) Selected
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LIVE CIRCUIT WARNING If this is alight – DO NOT PROCEED you are
connected to a live circuit. This useful indicator will also show if a (capacitive)
circuit under test is fully discharged before disconnecting any test leads.
2 LCD Display. When power up (Power ON/OFF) is selected your Kewtech KTD30
will default to symbols CERT, INS, 500V this means it is ready to perform a 500V
insulation test in Certification mode and it will do this test when you briefly press
button 8.
1 LIVE CIRCUIT WARNING If this is alight – DO NOT PROCEED you are
connected to a live circuit. This useful indicator will also show if a (capacitive)
circuit under test is fully discharged before disconnecting any test leads.
2 LCD Display. When power up (Power ON/OFF) is selected your Socket &
See PDIT 360 will default to symbols CERT, INS, 500V this means it is ready
to perform a 500V insulation test in Certification mode and it will do this test
when you briefly hit button 9.
500V
M
Ω
CERT INS
Overview of the Display
500V
250V
M
Ω
CERT
NUL
CONT INS
A
B
C
H
D
E
F
G
I
1000V
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Continuity Test Ranges
Accuracy (Cert mode)
Ranges (Auto Range)
Tolerance (@ 20°C)
0.00 to 9.99Ω
±3% ±2 digits
10.0 to 99.9Ω ±3% ±2 digits
100 to 999Ω ±3% ±2 digits
Open Circuit Voltage >4V, <10V
Short Circuit Current >200mA
Zero offset Adjust (Test Lead Null) 2Ω
Typical Test Time (Cert mode) (2Ω) <2 sec
Power
4 × AA alkaline batteries (not included)
Battery Life (BS EN 61557) > 5000 tests @ 500V test voltage
Environmental
Operating Temperature Range 0°C to 40°C
Storage Temperature Range –10°C to 60°C
Size 157mm × 89mm × 39mm
Weight 400g
Insulation Test Ranges
Accuracy (Cert mode)
Test Voltage
Ranges (Auto Range) Tolerance (@200C)
250V
0.01 to 9.99MΩ ±3% ±1 digit
10.0 to 99.9MΩ ±3% ±1 digit
100 to 199MΩ ±6% ±1 digit
500V
0.01 to 9.99MΩ ±3% ±1 digit
10.0 to 99.9MΩ ±3% ±1 digit
100 to 199MΩ ±3% ±1 digit
200 to 499MΩ ±6% ±1 digit
1000V
0.01 to 9.99MΩ ±3% ±1 digit
10.0 to 99.9MΩ ±3% ±1 digit
100 to 399MΩ ±3% ±1 digit
400 to 999MΩ ±6% ±1 digit
Output Voltage
Voltage Load
Output Current Tolerance
250 250kΩ
1 mA –0% +20%
500 500kΩ
1 mA –0% +20%
1000 1MΩ
1 mA –0% +20%
Short circuit current (in to 2kΩ) <2mA
Typical Test Time (cert mode) (10MΩ) <2 sec
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www.kewtechcorp.com
Kewtech Corporation Limited
Midas House, Unit 2b, Stones Courtyard, High Street, Chesham, Bucks HP5 1DE
T: 01494 792 212
F: 01494 791 826
E: sales@kewtechcorp.com
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