Microtest 6375 User manual

LCR METER
6375 / 6376 /
6377 / 6378/ 6379
1.0
User Manual

CONTENTS
1. SAFETY.............................................................................................................................1–1
1.1 General...........................................................................................................................1–1
1.2 AC Power Supply..........................................................................................................1–1
1.3 Adjustment, Maintenance and Repair............................................................................1–2
1.4 Static Electricity ............................................................................................................1–2
2. INTRODUCTION..............................................................................................................2–1
3. INSTALLATION...............................................................................................................3–1
3.1 AC Line Connections ....................................................................................................3–1
3.2 Measurement Connections.............................................................................................3–1
4. OPERATION.....................................................................................................................4–1
4.1 The Rear Panel...............................................................................................................4–1
4.1.1 Voltage Selector......................................................................................................4–1
4.1.2 IEC Socket and Fuse Holder...................................................................................4–1
4.1.3 Rear Panel Control Connections.............................................................................4–2
4.1.4 DC 5V Out..............................................................................................................4–2
4.1.5 GPIB Connector......................................................................................................4–2
4.1.6 Switching the Instrument ON..................................................................................4–3
4.1.7 Switching the Instrument OFF................................................................................4–3
4.2 The Front Panel .............................................................................................................4–4
4.2.1 The Soft Keys..........................................................................................................4–4
4.2.2 The Navigation Keys...............................................................................................4–5
4.2.3 The Control Keys....................................................................................................4–5
4.2.4 The Data Entry Keypad...........................................................................................4–6
4.3 Trimming........................................................................................................................4–8
4.3.1 Performing an O/C Trimor S/C Trim.. ...................................................................4–9
4.4 Measuring a Component..............................................................................................4–10
4.4.1 Example................................................................................................................4–11
4.4.2 MEASUREMENT MODE Parameters.................................................................4–12
5. ADVANCED OPERATION.............................................................................................5–1
5.1 Two-, Three- and Four-Terminal Connections...............................................................5–1
5.2 Measurement of Very Small Capacitors.........................................................................5–1
5.3 Measurement of Very Small Inductors...........................................................................5–1
5.4 Measurement of Iron-Cored and Ferrite Inductors.........................................................5–2
5.5 MULTI STEP MODE....................................................................................................5–3
5.5.1 MULTI STEP –Set.................................................................................................5–3
5.5.2 MULTI STEP –Run...............................................................................................5–4
5.6 The STATUS Page.........................................................................................................5–5
5.6.1 The STATUS Page Parameters................................................................................5–5
6. GENERAL PURPOSE INTERFACE BUS (GPIB)......................................................6–1

6.1 GPIB Control.................................................................................................................6–1
6.1.1 Introduction.............................................................................................................6–1
6.1.2 Interface Specification.............................................................................................6–1
6.1.3 Changing GPIB Address .........................................................................................6–1
6.1.4 Message Syntax.......................................................................................................6–2
6.1.5 Data Output.............................................................................................................6–5
6.1.6 Status Reporting......................................................................................................6–6
6.1.7 Common Commands.............................................................................................6–11
6.1.8 Standard Operation Status Commands..................................................................6–12
6.2 6375 Series Device-Specific Commands......................................................................6–13
6.2.1 Command Summary..............................................................................................6–13
6.3 Example Programs .......................................................................................................6–37
6.3.1 Example 1 .............................................................................................................6–38
6.3.2 Example 2 .............................................................................................................6–39
6.3.3 Example 3 .............................................................................................................6–39
6.3.4 Example 4 .............................................................................................................6–41
7. 6375 SERIES SPECIFICATION.....................................................................................7–1
7.1 Measurement Parameters................................................................................................7–1
7.2 Test Conditions..............................................................................................................7–1
7.2.1 AC Drive.................................................................................................................7–1
7.3 Measurement Speeds......................................................................................................7–2
7.4 Display Range................................................................................................................7–3
7.5 Modes Of Operation ......................................................................................................7–3
7.5.1 MEASUREMENT..................................................................................................7–3
7.5.2 MULTI-STEP..........................................................................................................7–3
7.6 Measurement Connections.............................................................................................7–3
7.7 Measurement Accuracy..................................................................................................7–3
7.8 Accuracy Chart...............................................................................................................7–5
7.8.1 |Z| Accuracy Chart...................................................................................................7–5
7.8.2 |Z| vs L, C Chart ......................................................................................................7–6
7.8.3 |Z|, |Y|, L, C, R, X, G and B Accuracy.....................................................................7–7
7.8.4 D Accuracy..............................................................................................................7–7
7.8.5 Q Accuracy..............................................................................................................7–7
7.9 General...........................................................................................................................7–9
7.9.1 Power Supply..........................................................................................................7–9
7.9.2 Display....................................................................................................................7–9
7.9.3 Remote Control.......................................................................................................7–9
7.9.4 Remote Trigger........................................................................................................7–9
7.9.5 Mechanical..............................................................................................................7–9
7.10 Environmental Conditions ...........................................................................................7–9
7.10.1 Temperature Range................................................................................................7–9
7.10.2 Relative Humidity .................................................................................................7–9
7.10.3 Altitude...............................................................................................................7–10
7.10.4 Installation Category...........................................................................................7–10
7.10.5 Pollution Degree.................................................................................................7–10
7.10.6 Safety..................................................................................................................7–10
7.10.7 EMC....................................................................................................................7–10

8. THEORY REFERENCE..................................................................................................8–1
8.1 Abbreviations.................................................................................................................8–1
8.2 Formulae........................................................................................................................8–1
8.3 Series/Parallel Conversions ...........................................................................................8–2
8.4 Polar Derivations ...........................................................................................................8–2
9. MAINTENANCE, SUPPORT AND SERVICES ...........................................................9–1
9.1 Guarantee.......................................................................................................................9–1
9.2 Maintenance...................................................................................................................9–1
9.2.1 Cleaning..................................................................................................................9–1
9.2.2 Safety Checks .........................................................................................................9–1
9.3 Support and Service.......................................................................................................9–2

1–1
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 and the associated sales organizations accept no responsibility for personal or
material damage, nor for any consequential damage that results from irresponsible or
unspecified operation or misuse of this equipment.
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

1–2
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.
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:

1–3
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 1M.
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 suppliers packaging until required for use.