Microtest 7700 User manual

IMPULSE / SURGE TESTER
7700 / 7710 / 7720
User Manual
Issue B
3rd May 2006
Part Nº 9H7700

1–1
Contents
1. SAFETY............................................................................................................................1–4
1.1 General ..........................................................................................................................1–4
1.2 AC Power Supply..........................................................................................................1–5
1.3 Adjustment, Maintenance and Repair ...........................................................................1–5
1.4 Static Electricity............................................................................................................1–6
2. INTRODUCTION............................................................................................................2-1
2.1 Package and Accessories............................................................................................... 2-1
2.1.1 7700....................................................................................................................... 2-1
2.1.2 7710....................................................................................................................... 2-1
2.1.3 7720....................................................................................................................... 2-1
3. INSTALLATION.............................................................................................................3-1
3.1 AC Line Connections.................................................................................................... 3-1
3.2 Location ........................................................................................................................ 3-1
3.3 Measurement Connections............................................................................................ 3-1
3.4 Safety Interlock ............................................................................................................. 3-2
4. OPERATION....................................................................................................................4-1
4.1 The Front Panel............................................................................................................. 4-1
4.2 The Rear Panel .............................................................................................................. 4-2
4.3 Product Identification.................................................................................................... 4-3
4.3.1 Ready State............................................................................................................ 4-3
4.4 Keyboard....................................................................................................................... 4-3
4.4.1 System Control...................................................................................................... 4-3
4.4.2 Function................................................................................................................. 4-3
4.4.3 Edit ........................................................................................................................ 4-3
4.4.4 Enter ...................................................................................................................... 4-4
4.4.5 Test ........................................................................................................................ 4-4
4.4.6 Screen Soft Keys ................................................................................................... 4-4
4.5 Function Menu .............................................................................................................. 4-4
4.5.1 Self–Test................................................................................................................ 4-4
4.5.2 SYS. INFO ............................................................................................................ 4-5
4.5.3 H/V CAL. and H/V TEST..................................................................................... 4-5
4.6 System Setup Menu ...................................................................................................... 4-5
4.6.1 SYSTEM ............................................................................................................... 4-6
4.6.2 GRAPHICS ........................................................................................................... 4-8
4.6.3 DATE TIME ......................................................................................................... 4-9
4.6.4 PASSWORD ......................................................................................................... 4-9
4.7 Test Programs ............................................................................................................. 4-10
4.7.1 File Menu ............................................................................................................ 4-10
4.7.2 Filename Character Entry.................................................................................... 4-10
4.7.3 Creating a Test Program File............................................................................... 4-10
4.7.4 Edit an Existing Test Program............................................................................. 4-11
4.7.5 Deleting a Test Program...................................................................................... 4-11

1–2
4.7.6 Sorting ................................................................................................................. 4-11
4.7.7 View Mode .......................................................................................................... 4-12
5. TESTING A NEW COMPONENT ................................................................................5-1
5.1 Create a New Test Program File ................................................................................... 5-1
5.2 Test Voltage .................................................................................................................. 5-1
5.2.1 Example of Establishing the Test Voltage ............................................................ 5-1
5.3 Test Mode Menu ........................................................................................................... 5-1
5.3.1 Test Mode.............................................................................................................. 5-1
5.3.2 Dummy Pulse ........................................................................................................ 5-2
5.3.3 Testing Pulse ......................................................................................................... 5-2
5.4 Creating the Standard Waveform.................................................................................. 5-2
5.4.1 Safety Interlock ..................................................................................................... 5-2
5.4.2 Learning a Component .......................................................................................... 5-2
5.5 Selecting the Test Parameters ....................................................................................... 5-3
5.6 Setting the Test Parameters ........................................................................................... 5-3
5.6.1 Waveform Area Size Setup ................................................................................... 5-4
5.6.2 Differential Area Size Setup.................................................................................. 5-4
5.6.3 Flutter Value Setup................................................................................................ 5-5
5.6.4 Waveform Comparison Setup ............................................................................... 5-6
5.6.5 Optimizing the Test Parameter Settings ................................................................ 5-7
6. COMPONENT TESTING...............................................................................................6-1
6.1 Test Statistics ................................................................................................................ 6-2
7. REMOTE CONTROL.....................................................................................................7-1
7.1 Serial Port...................................................................................................................... 7-1
7.1.1 Protocol ................................................................................................................. 7-1
7.1.2 Serial Port Connections ......................................................................................... 7-1
7.1.3 REMOTE CONTROL SIGNAL ......................................................................... 7-1
7.1.4 Commands............................................................................................................. 7-2
7.2 Handler Port .................................................................................................................. 7-4
7.2.1 Pin Assignment...................................................................................................... 7-4
7.2.2 Port Timing............................................................................................................ 7-5
8. THEORY OF OPERATION...........................................................................................8-1
8.1 Applied Pulse ................................................................................................................ 8-1
8.2 Why Use Impulse Testing? ........................................................................................... 8-1
9. HIGH VOLTAGE CALIBRATION & TEST...............................................................9-1
9.1 High Voltage Calibration .............................................................................................. 9-1
9.2 High Voltage Test ......................................................................................................... 9-2
10. SPECIFICATION......................................................................................................... 10–1
10.1 Measurement Ports..................................................................................................... 10–1
10.2 Advanced Functions................................................................................................... 10–1
10.3 Testing Functions ....................................................................................................... 10–1
10.4 Voltage Pulse ............................................................................................................. 10–1
10.5 Measuring Time ......................................................................................................... 10–1

1–3
10.6 Waveform Resolution .................................................................................................10–1
10.7 Display/Audio .............................................................................................................10–2
10.8 Interface ......................................................................................................................10–2
10.9 Memory.......................................................................................................................10–2
10.10 Power Supply .........................................................................................................10–2
10.11 Accessories.............................................................................................................10–2
10.12 Thermo/Humility....................................................................................................10–2
10.13 Size.........................................................................................................................10–2
10.14 Weight ....................................................................................................................10–2
10.15 Options ...................................................................................................................10–3
11. MAINTENANCE, SUPPORT AND SERVICES........................................................11-1
11.1 Guarantee .................................................................................................................... 11-1
11.2 Maintenance ................................................................................................................ 11-1
11.2.1 Cleaning .............................................................................................................. 11-1
11.2.2 Safety Checks...................................................................................................... 11-1
11.3 Support and Service .................................................................................................... 11-2

1–4
1. Safety
1.1 General
This equipment has been designed to meet the requirements of EN61010-1 ‘Safety requirements
for electrical equipment for measurement, control & laboratory use’ and has left the factory in a
safe condition.
The following definitions in EN61010-1 are applicable:
OPERATOR Person operating equipment for its intended purpose.
Note: The OPERATOR should have received training
appropriate for this purpose.
RESPONSIBLE BODY Individual or group responsible for the use and maintenance
of equipment and for ensuring that operators are adequately
trained.
The RESPONSIBLE BODY must ensure that this equipment is only used in the manner
specified. If it is not used in such a manner, the protection provided by the equipment may be
impaired.
This product is not intended for use in atmospheres which are explosive, corrosive or adversely
polluted (e.g. containing conductive or excessive dust). It is not intended for use in safety
critical or medical applications.
The equipment can cause hazards if not used in accordance with these instructions. Read them
carefully and follow them in all respects.
Do not use the equipment if it is damaged. In such circumstances the equipment must be
made inoperative and secured against any unintentional operation.
MICROTEST ELECTRONICS and the associated sales organizations accept no
responsibility for personal or material damage, or for any consequential damage that
results from irresponsible or unspecified operation or misuse of this equipment.

1–5
1.2 AC Power Supply
Power cable and connector requirements vary between countries. Always use a cable that
conforms to local regulations, terminated in an IEC320 connector at the instrument end.
If it is necessary to fit a suitable AC power plug to the power cable, the user must observe the
following colour codes:
WIRE EUROPEAN N. AMERICAN
LIVE BROWN BLACK
NEUTRAL BLUE WHITE
GROUND GREEN/YELLOW GREEN
The user must also ensure that the protective ground lead would be the last to break should the
cable be subject to excessive strain.
If the plug is fused, a 3-amp fuse should be fitted.
If the power cable electrical connection to the AC power plug is through screw terminals then,
to ensure reliable connections, any solder tinning of the cable wires must be removed before
fitting the plug.
Before switching on the equipment, ensure that it is set to the voltage of the local AC power
supply.
WARNING!
Any interruption of the protective ground conductor inside or outside the equipment or
disconnection of the protective ground terminal is likely to make the equipment dangerous.
Intentional interruption is prohibited.
1.3 Adjustment, Maintenance and Repair
WARNING!
The equipment must be disconnected from all voltage sources before it is opened for any
adjustment, replacement, maintenance, or repair.
When the equipment is connected to the local AC power supply, internal terminals may be live
and the opening of the covers or removal of parts (except those to which access can be gained
by hand) is likely to expose live parts.

1–6
Capacitors inside the equipment may still be charged even if the equipment has been
disconnected from all voltage sources.
Any adjustment, maintenance, or repair of the opened equipment under voltage must be carried
out by a skilled person who is aware of the hazards involved.
Service personnel should be trained against unexpected hazards.
Ensure that only fuses with the required rated current and of the specified type are used for
replacement. The use of makeshift fuses and short-circuiting of fuse holders is prohibited.
1.4 Static Electricity
The unit supplied uses static-sensitive devices. Service personnel should be alerted to
components which require handling precautions to avoid damage by static electrical discharge.
Before handling circuit board assemblies containing these components, personnel should
observe the following precautions:
1) The work surface should be a conductive grounded mat.
2) Soldering irons must be grounded and tools must be in contact with a conductive surface to
ground when not in use.
3) Any person handling static-sensitive parts must wear a wrist strap which provides a leaky
path to ground, impedance not greater than 1MΩ.
4) Components or circuit board assemblies must be stored in or on conductive foam or mat
while work is in progress.
5) New components should be kept in the supplier’s packaging until required for use

2-1
2. Introduction
The 7700 series of Winding Testers provide a non-destructive way to test windings using a high
voltage pulse of between 500V and 10kV. By comparing the decay waveforms with a standard
winding, deviation in core material, number of turns, shorted turns, and insulation breakdown
can be identified.
The tester’s measurement, display and control facilities include:
•memory for up to 200 standard windings
•auto learn for standard windings
•waveform area, differential area, flutter and waveform comparison
•full statistics for each winding stored in memory
•output of measurements and statistics to an Epson-compatible printer
•built-in High Voltage calibration and test
•the unit may be locked in test mode
2.1 Package and Accessories
2.1.1 7700
•7700 Impulse Winding Tester
•2 terminal
•Power cord and Connector
2.1.2 7710
•7700 Impulse Winding Tester
•2 terminal
•Power cord and Connector
2.1.3 7720
• 7720 Impulse Winding Tester
• 8 terminal
• Power cord and Connector

3-1
3. Installation
3.1 AC Line Connections
The unit is provided with a power cable capable of carrying the input current for both 115V and
230V operation. This cable should be connected via a suitable connector to the local AC power
supply. The colour code employed is as follows:
WIRE EUROPEAN N. AMERICAN
LIVE BROWN BLACK
NEUTRAL BLUE WHITE
GROUND GREEN/YELLOW GREEN
Figure 3-1 AC Power Cable Codes
The supply voltage setting can be checked by looking on the rear panel next to the power inlet
socket. Ensure that the unit is not connected to the power supply. Adjust the switch to read the
required voltage. No adjustment is required for variation of supply frequency.
Before connecting the AC power, read the precautions listed under section 1.2 AC Power
Supply.
The power switch is located on the left of the front panel.
The instrument is not suitable for battery operation.
3.2 Location
The instrument is intended for use on the bench. The power modules are fan cooled and care
must be taken not to restrict any of the air paths. Ensure that the unit is located in an area
appropriate for the hazardous voltages produced when testing components. See sections 3.3 and
3.4.
3.3 Measurement Connections
WARNING!
This equipment is intended for use by suitably trained and competent persons.
This product is capable of having hazardous voltages (up to 10kV) on its terminals in
normal use. Appropriate safety precautions should be taken.
This product can cause hazards if it is not used in accordance with these instructions.
Read them carefully and follow them in all respects. Double check connections to the unit
before use.

3-2
DO NOT USE THIS EQUIPMENT IF IT IS DAMAGED.
For maximum user safety, it recommended that a safety interlock is used.
3.4 Safety Interlock
WARNING!
HIGH VOLTAGE
This product is capable of having hazardous voltages (up to 10kV) on its terminals in
normal use. Appropriate safety precautions should be taken.
A high voltage pulse, or pulses, is applied during testing. The front panel High Voltage
(H.V.) LED will light whenever a high voltage pulse is applied to the component under test.
ENSURE THAT THE COMPONENT UNDER TEST AND TEST LEAD
TERMINATIONS CANNOT BE TOUCHED DURING THE TEST CYCLE.
The High Voltage (H.V.) output is inhibited until the safety interlock circuit is complete. The
terminal fixture for the winding under test should be placed within ahousing with an interlocked
door controlled by a circuit such as that shown in Figure 3-2.
Resistor R should be < 1k.
Figure 3-2 Typical High.Voltage(H.V.) Interlock Fixture
When the fixture door is closed, and the micro switch therefore made, the High Voltage output
is activated via the relay. The relay also energizes an AC supply for a solenoid which can be
used to lock the door while the High Voltage output is on.