Socket & See DIT 400 User manual

01/05
USER
GUIDE
DIT 400
DIGITAL INSULATION AND
CONTINUITY TESTER

Caution
We strongly advise reading and understanding this guide before the
instrument is used. In particular note the safety issues that follow:-
Your tester is for use on dead circuits only. Although your Socket &
See instrument is fully protected against accidental connection to a
live circuit it always pays 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 - Socket & See 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 live circuit) -
if this fuse does blow replace it with the correct type F 500mA fast
blow ceramic 500V). It is located inside the batttery compartment.
BS EN
61010-1

Batteries
Because of storage isssues your DIT 400 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
batteries observing correct ploarity. 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 Overview
If you are experienced in using insulation and continuity testers your
DIT 400 will power up and default to a mode you are totally familiar
with (we call it ’CERT’ - Certification mode).
If you are experienced we suggest you use this mode (the tester will
always default to this mode when you power up) for the first few
jobs to familiarise yourself with how quickly your Socket & See
DIT 400 works.
Then we believe you will want to explore our SFS
(Super Fast System mode) since if you think the
’CERT’ mode is fast - SFS delivers super fast results
based on
GO-NO-GO technology. SFS ’looks’ straight at a value - in the case
of insulation for example the value is 2MΩ(as recommended in
most codes of practice).
If the insulation value is below 2MΩ(bad) the display will show
<1.99MΩand give an audible warning tone.
If the insulation is above 2MΩ(good) the display will show
>2.00MΩand give a continuous tone.
This will typically take less than one second saving you time and
greatly extending battery life. You will find the same SFS system
operates for Continuity Testing.

1.
Live Circuit
2.
LCD Display
3.
Power
ON/OFF
(including
Intelligent
Auto Power
Off)
4.
Insulation
Test
5.
Insulation
Test Voltage
250V
500V
1000V
6.
Continuity
Test
7.
CERT
(Certification)
SFS (Super
Fast System)
Mode
8. Continuity
Test Lead Null
9.
Briefly Push to
Test (Instant)
plus
Push and Hold
for 2 seconds
for Auto Test
(Hands Free)
Operation - A Detailed View

LIVE CIRCUIT WARNING
1. 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 DIT 400 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.
This is how the display will look when you first power up the
instrument.

Overview of the Display
A. Fuse Broken DO NOT PROCEED
B. >Greater Than / <Less Than
C. Battery Condition ( = good).
D. Test Mode - SFS - Super Fast System or CERT - Certification
E. Measuring Mode - INS - Insulation or CONT - Continuity
F. Insulation DC Volts Test Pressure - 250 - 500 - 1000V DC
G. Measuring Units - MΩ - Insulation - Ω - Continuity
H. Nul Function - (Continuity only) Nuls and stores Ohms value of
the test leads for the testing sesssion you are in (automatically
resets to zero on switch off)
I. Auto Test (Hands Free) Selected
D
H
C
B
A
E
F
G
I

3. Power ON/OFF - Pressing and releasing this button turns the
DIT 400 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 DIT 400
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 with the
exception of the above systems
1000V DC for circuits above 500V
(SELV = Separated Extra-Low Voltage. PELV = Protective Extra-Low Voltage).
6. Selects Continuity Test Mode.
7. CERT/SFS Mode (Certification/Super Fast System) - This is the
heart of your Socket & See DIT 400 tester. (On switch on your
DIT 400 defaults to Certification mode. In CERT (Certification)
mode the DIT 400 will record results (with accuracy FULLY
COMPLIANT with BSEN 61557). To allow completion of
certificates requiring recording and logging of absolute values for
insulation or continuity testing.
In SFS (Super Fast System) mode the DIT 400 uses NEW
Patented Technology to deliver a super fast result. It does this by
going straight to the critical measurement point of 2MΩ as
recommended in codes of practice.
Insulation test less than 1.99MΩgives a bad result (FAIL) and
greater than 2.0MΩgood (PASS).
SFS Continuity Test is less than 2Ωgood (PASS) higher than 2Ω
bad (FAIL)

If there is a FAIL result in SFS mode a quick switch to CERT
mode will reveal the extent of the problem. In addition an
audible signal clearly indicates PASS or FAIL.
8. 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
9 is pressed - the value is is reset to zero after Power OFF (or
Auto Power OFF) is selected.
9.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
point your DIT 400 will carry out an automatic test and capture
the result for as long as the probes are held in contact. Hands
Free works in Insulation Cert Mode only.
A brief push on the Test button unlocks Hands Free mode.
At Socket & See our Engineers constantly look for improvement. If there
is any aspect of your Socket & See tester you would like to comment
on please visit our website at www.socketandsee.co.uk or email
[email protected] or Free Fax at 0800 7831385 with any suggestions.
We promise all communications will be acknowledged. We value
YOUR opinion.

Insulation Test Ranges
Accuracy (Cert mode)
Test Voltage Ranges (Auto Range) Tolerance (@200C)
0.01 to 9.99MΩ±3% ±1 digit
250V 10.0 to 99.9MΩ±3% ±1 digit
100 to 199MΩ±6% ±1 digit
0.01 to 9.99MΩ±3% ±1 digit
500V 10.0 to 99.9MΩ±3% ±1 digit
100 to 199MΩ±3% ±1 digit
200 to 499MΩ±6% ±1 digit
0.01 to 9.99MΩ±3% ±1 digit
1000V 10.0 to 99.9MΩ±3% ±1 digit
100 to 399MΩ±3% ±1 digit
400 to 999MΩ±6% ±1 digit
Output Voltage (Cert and SFS mode)
Voltage Load Output Current Tolerance
250 250kΩ1 mA -0% +20%
500 50kΩ1 mA -0% +20%
1000 1MΩ1 mA -0% +20%
Short circuit current (in to 2kΩ) <2mA
Typical Test Time (cert mode) (10MΩ) <2 sec
Typical Test Time (SFS mode) (10MΩ) <1 sec
SFS Threshold 2MΩ

Continuity Test Ranges
Accuracy (Cert mode)
Ranges (Auto Range) Tolerance (@ 200C)
0.00 to 9.99 Ω±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
Typical Test Time (SFS mode) (2Ω) <1 sec
SFS Threshold 10 Ω
Power
4 x AA alkaline batteries (not included)
Battery Life (BS EN 61557) > 5000 tests @ 500V test
voltage
Environmental
Operating Temperature Range 00C to 400C
Storage Temperature Range -100C to 600C
Size 157mm x 89mm x 39mm
Weight 400g

Socket & See Limited.
Rankine Road, Basingstoke
RG24 8PP, United Kingdom.
Tel [phone]
Fax [phone]
e-mail: [email protected]
www.socketandsee.co.uk
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