Motech MT 4080 Operating Manual

MT 4080

LCR METER

OPERATING MANUAL

Contents

1. INTRODUCTION ............................................................. 1

1.1 G

ENERAL

.......................................................................... 1

1.2 I

MPEDANCE PARAMETERS

................................................ 3

1.3 S

PECIFICATION

.................................................................. 6

1.4 A

CCESSORIES

................................................................. 19

2. OPERATION ................................................................... 20

2.1 P

HYSICAL DESCRIPTION

................................................. 20

2.2 M

AKING MEASUREMENT

............................................... 21

2.2.1 Battery Replacement ...............................................................21

2.2.2 Battery Recharging/AC operation.......................................... 22

2.2.3 Open and Short Calibration ................................................... 23

2.2.4 Display Speed.......................................................................... 24

2.2.5 Relative Mode ......................................................................... 24

2.2.6 Range Hold ............................................................................. 24

2.2.7 DC Resistance Measurement.................................................. 25

2.2.8 AC Impedance Measurement.................................................. 25

2.2.9 Capacitance Measurement .....................................................25

2.2.10 Inductance Measurement........................................................ 26

2.3 A

CCESSORY OPERATION

................................................. 27

3. INFRARED OPERATION............................................. 29

3.1 C

OMMAND SYNTAX

........................................................ 30

3.2 C

OMMANDS

.................................................................... 31

4. APPLICATION ............................................................... 39

4.1 T

EST LEADS CONNECTION

............................................. 39

4.2 O

PEN/SHORT COMPENSATION

........................................ 44

4.3 S

ELECTING THE SERIES OR PARALLEL MODE

................. 46

5. WARRANTY INFORMATION ..................................... 49

6. SAFETY PRECAUTION ............................................... 51

1

1. Introduction

1.1 General

The MT4080 is a high accuracy handheld LCR meter that can
perform the inductor, capacitor and resistor measurement up to
100KHz within 0.2% basic accuracy. It is the most advanced
handheld AC/DC impedance measurement instrument to date. The
MT4080 can help engineers and students to understand the
characteristic of electronics components. It is also of great
assistance to those people who want to do the quality control of the
electronics components.

The instrument is auto or manual ranging. Test frequencies of
100Hz, 120Hz, 1KHz, 10KHz or 100KHz (MT4080A only) may
be selected on all applicable ranges. The test voltages of
50mVrms, 0.25Vrms, 1Vrms or 1VDC (DCR only) may also be
selected on all applicable ranges. The dual display feature permits
simultaneous measurements.

Components can be measured in the series or parallel mode as
desired; the more standard method is automatically selected first
but can be overridden.

The highly versatile MT4080 can perform virtually all the
functions of most bench type LCR bridges. With a basic accuracy
of 0.2%, this economical LCR meter may be adequately
substituted for a more expensive LCR bridge in many situations.
The meter is powered from two AA Batteries and is supplied with
an AC to DC charging adapter and two AA Ni-Mh Rechargeable

2

Batteries.

The instrument has applications in electronic engineering labs,
production facilities, service shops, and schools. It can be used to
check ESR values of capacitors, sort values, select precision values,
measure unmarked and unknown inductors, capacitors or resistors,
and to measure capacitance, inductance, or resistance of cables,
switches, circuit board foils, etc.

The key features are as following:



Test condition:

1 Frequency : 100Hz / 120Hz / 1KHz / 10KHz /

100KHz (MT4080A only)

2. Level : 1Vrms / 0.25Vrms / 50mVrms /
1VDC (DCR only)



Measurement Parameters : Z, Ls, Lp, Cs, Cp,

DCR, ESR, D, Q and

θ



Basic Accuracy: 0.2%



Dual Liquid Crystal Display



Fast/Slow Measurement



Auto Range or Range Hold



Infrared Interface Communication



Open/Short Calibration



Primary Parameters Display:

Z : AC Impedance
DCR : DC Resistance
Ls : Serial Inductance
Lp : Parallel Inductance
Cs : Serial Capacitance
Cp : Parallel Capacitance

3



Second Parameter Display:

θ

: Phase Angle
ESR : Equivalence Serial Resistance
D : Dissipation Factor
Q : Quality Factor



Combinations of Display:

Serial Mode : Z –

θ

, Cs – D, Cs – Q, Cs – ESR, Ls –

D, Ls – Q, Ls – ESR

Parallel Mode : Cp – D, Cp – Q, Lp – D, Lp – Q

1.2 Impedance Parameters

Due to the different testing signals on the impedance measurement
instrument, there are DC impedance and AC impedance. The
common digital multi-meter can only measure the DC impedance,
but the MT4080 can do both. It is a very important issue to
understand the impedance parameters of the electronic component.

When we analysis the impedance by the impedance measurement
plane (Figure 1.1). It can be visualized by the real element on the
X-axis and the imaginary element on the y-axis. This impedance
measurement plane can also be seen as the polar coordinates. The

Z is the magnitude and the

θ

is the phase of the impedance.

4

(

)

()

()

()

()

Ohm

Reactance

Resistance

Impedance

1

22

=Ω

=

=

=















==

+==

Ω∠=+=

−

S

S

s

s

s

sss

ss

X

R

Z

R

X

TanSinZX

XRZCosZR

ZjXRZ

θθ

θ

θ

There are two different types of reactance: Inductive (X

L

) and

Capacitive (X

C

). It can be defined as follows:

Also, there are quality factor (Q) and the dissipation factor (D) that
need to be discussed. For component, the quality factor serves as a
measure of the reactance purity. In the real world, there is always

s

X

s

R

(

)

sX,RZ

s

Z

θ

Imaginary Axis

Real Axis

Figure 1.1

)(

)(tan

2

11

)(tan2

HzFrequencyf

FceCapaciC

fCC

X

HceInducLfLLX

C

L

=

===

=

==

πω

π

ω

5

some associated resistance that dissipates power, decreasing the
amount of energy that can be recovered. The quality factor can be
defined as the ratio of the stored energy (reactance) and the
dissipated energy (resistance). Q is generally used for inductors
and D for capacitors.

There are two types of the circuit mode. One is series mode, the
other is parallel mode. See Figure 1.2 to find out the relation of the
series and parallel mode.

pp

p

p

p

p

sss

s

s

s

RC

L

R

X

R

G

B

RCR

L

R

X

D

Q

ω

ω

ω

ω

δ

===

=

===

==

1

tan

11

6

1.3 Specification



LCD Display Range:

Parameter Range

Z

0.000

Ω

to 9999 MΩ
L 0.000 µH to 9999 H
C 0.000 pF to 9999 F

DCR

0.000

Ω

to 9999 MΩ

ESR

0.000

Ω

to 9999 Ω

D 0.000 to 9999
Q 0.000 to 9999

θ

-180.0

°

to 180.0

°

Figure 1.2

Real and imaginary components are serial

ss

jXRZ

+

=

Rs jX

s

Real and imaginary components are Parallel

G=1/R

p

j

B=1/jX

p

jBGY

+

=

j

X

p

R

p

P

jX

1

P

R

1

Y +=

7



Accuracy (Ae):

Z Accuracy:

|Zx|

Freq.

20M ~

10M

(

Ω

)

10M ~

1M
(Ω)

1M ~
100K

(Ω)

100K ~

10

(Ω)

10 ~ 1

(Ω)

1 ~ 0.1

(Ω)
DCR
100Hz
120Hz
1KHz

2%

±

1



1%

±

1

10KHz

5%

±

1



2%

±

1

0.5%

±

1

0.2%

±

1

0.5%

±

1

1%

±

1



100KHz
(4080A)

NA

5%

±

1



2%

±

1 0.4%

±

1

2%

±

1 5%±1



Note : 1. The accuracy applies when the test level is set to 1Vrms.

2

.Ae

multiplies 1.25 when the test level is set to
250mVrms.
3

.Ae

multiplies 1.50 when the test level is set to 50mVrms.

4.When measuring L and C, multiply

Ae

by

2

1 Dx+

if

the Dx

＞

0.1.



: Ae is not specified if the test level is set to 50mV.

8

C Accuracy :

79.57
pF

|

159.1
pF

159.1
pF

|

1.591
nF

1.591
nF

|

15.91
nF

15.91
nF

|

159.1
uF

159.1
uF

|

1591

uF

1591

uF

|

15.91
mF

100Hz

2% ± 1

X

1% ± 1 0.5%

±

1

0.2%

±

1

0.5%

±

1

1% ± 1

X

66.31
pF

|

132.6
pF

132.6
pF

|

1.326
nF

1.326
nF

|

13.26
nF

13.26
nF

|

132.6
uF

132.6
uF

|

1326

uF

1326

uF

|

13.26
mF

120Hz

2%

±

1

X

1% ± 1 0.5%

±

1

0.2%

±

1

0.5%

±

1

1% ± 1

X

7.957
pF

|

15.91
pF

15.91
pF

|

159.1
pF

159.1
pF

|

1.591
nF

1.591
nF

|

15.91
uF

15.91
uF

|

159.1
uF

159.1
uF

|

1.591

mF

1KHz

2%

±

1

X

1% ± 1 0.5%

±

1

0.2%

±

1

0.5%

±

1

1% ± 1

X

0.795
pF

|

1.591
pF

1.591
pF

|

15.91
pF

15.91
pF

|

159.1
pF

159.1
pF

|

1.591
uF

1.591
uF

|

15.91
uF

15.91
uF

|

159.1
uF

10KHz

5% ± 1

X

2% ± 1 0.5%

±

1

0.2%

±

1

0.5%

±

1

1% ± 1

X

NA 0.159

pF

|

1.591
pF

1.591
pF

|

15.91
pF

15.91
pF

|

159.1
nF

159.1
nF

|

1.591
uF

1.591
uF

|

15.91
uF

100KHz
(4080A)

NA 5%

±

1

X

2%± 1 0.4%

±

1

2%± 1 5% ± 1

X

9

L Accuracy :

31.83
KH

|

15.91
KH

15.91
KH

|

1591

H

1591

H

|

159.1
H

159.1
H

|

15.91

mH

15.91
mH

|

1.591
mH

1.591
mH

|

159.1

uH

100Hz

2%

±

1

X

1% ± 1 0.5%

±

1

0.2%

±

1

0.5%

±

1

1% ± 1

X

26.52
KH

|

13.26
KH

13.26
KH

|

1326

H

1326

H

|

132.6
H

132.6
H

|

13.26

mH

13.26
mH

|

1.326
mH

1.326
mH

|

132.6

uH

120Hz

2%

±

1

X

1% ± 1 0.5%

±

1

0.2%

±

1

0.5%

±

1

1% ± 1

X

3.183
KH

|

1.591
KH

1.591
KH

|

159.1

H

159.1
H

|

15.91
H

15.91
H

|

1.591

mH

1.591
mH

|

159.1

uH

159.1
uH

|

15.91
uH

1KHz

2% ± 1

X

1% ± 1 0.5%

±

1

0.2%

±

1

0.5%

±

1

1% ± 1

X

318.3
H

|

159.1
H

159.1
H

|

15.91
H

15.91
H

|

1.591
H

1.591
H

|

159.1

uH

159.1
uH

|

15.91
uH

15.91
uH

|

1.591
uH

10KHz

5%

±

1

X

2% ± 1 0.5%

±

1

0.2%

±

1

0.5%

±

1

1% ± 1

X

31.83
H

|

15.91
H

15.91
H

|

1.591
H

1.591
H

|

159.1

mH

159.1
mH

|

15.91

uH

15.91
uH

|

1.591
uH

1.591
uH

|

0.159
uH

100KHz
(4080A)

NA 5%

±

1

X

2%± 1 0.4%

±

1

2%± 1 5% ± 1

X

10

D Accuracy :

|Zx|

Freq.

20M ~

10M

(Ω)

10M ~

1M
(Ω)

1M ~
100K

(Ω)

100K ~

10

(Ω)

10 ~ 1

(Ω)

1 ~ 0.1

(Ω)

100Hz

120Hz

1KHz

±

0.020



±

0.010

10KHz

±

0.050



±

0.020

±

0.005 ±0.002 ±0.005 ±0.010



100KHz
(4080A)

NA

±

0.050



±

0.020 ±0.004 ±0.020 ±0.050



θ Accuracy :

|Zx|

Freq.

20M ~

10M

(Ω)

10M ~

1M
(Ω)

1M ~
100K

(Ω)

100K ~

10

(Ω)

10 ~ 1

(Ω)

1 ~ 0.1

(Ω)

100Hz

120Hz

1KHz

±

1.046



±

0.523

10KHz

±

2.615



±

1.046

±

0.261 ±0.105 ±0.261 ±0.523



100KHz
(4080A)

NA

±

2.615



±

1.046 ±0.209 ±1.046 ±2.615



11

Z Accuracy:

As shown in table 1.

C Accuracy:

Cxf

Zx

⋅⋅⋅

=

π

2

1

C

Ae

= Ae of |Zx|
f : Test Frequency (Hz)
Cx : Measured Capacitance Value (F)

|Zx| : Measured Impedance Value (

Ω

)

Accuracy applies when Dx (measured D value)

≦

0.1

When Dx > 0.1, multiply C

Ae

by

2

1 Dx+

Example:
Test Condition:
Frequency : 1KHz
Level : 1Vrms
Speed : Slow
DUT : 100nF
Then

Ω=

⋅⋅⋅⋅

=

⋅⋅⋅

=

−

1590

10100102

1

2

1

93

π

π

Cxf

Zx

Refer to the accuracy table, get C

Ae

=±0.2%

12

L Accuracy:

LxfZx ⋅⋅⋅=

π

2

L

Ae

= Ae of |Zx|
f : Test Frequency (Hz)
Lx : Measured Inductance Value (H)

|Zx| : Measured Impedance Value (

Ω

)

Accuracy applies when Dx (measured D value)

≦

0.1

When Dx > 0.1, multiply L

Ae

by

2

1 Dx+

Example:
Test Condition:
Frequency : 1KHz
Level : 1Vrms
Speed : Slow
DUT : 1mH
Then

Ω=⋅⋅⋅=

⋅⋅⋅=

−

283.610102

2

33

π

π

LxfZx

Refer to the accuracy table, get L

Ae

=±0.5%

ESR Accuracy:

100

Ae

XxESR

Ae

⋅±=

Cxf

LxfXx

⋅⋅⋅

=⋅⋅⋅=

π

π

2

1

2

13

ESRAe = Ae of |Zx|
f : Test Frequency (Hz)

Xx : Measured Reactance Value (

Ω

)
Lx : Measured Inductance Value (H)
Cx : Measured Capacitance Value (F)
Accuracy applies when Dx (measured D value)

≦

0.1

Example:
Test Condition:
Frequency : 1KHz
Level : 1Vrms
Speed : Slow
DUT : 100nF
Then

Ω=

⋅⋅⋅⋅

=

⋅⋅⋅

=

−

1590

10100102

1

2

1

93

π

π

Cxf

Zx

Refer to the accuracy table, get
C

Ae

=±0.2%,

Ω±=⋅±= 18.3

100

Ae

XxESR

Ae

D Accuracy:

100

Ae

D

Ae

±=

14

DAe = Ae of |Zx|
Accuracy applies when Dx (measured D value)

≦

0.1

When Dx > 0.1, multiply Dx by (1+Dx)

Example:
Test Condition:
Frequency : 1KHz
Level : 1Vrms
Speed : Slow
DUT : 100nF
Then

Ω=

⋅⋅⋅⋅

=

⋅⋅⋅

=

−

1590

10100102

1

2

1

93

π

π

Cxf

Zx

Refer to the accuracy table, get
C

Ae

=±0.2%,

002.0

100

±=⋅±=

Ae

D

Ae

Q Accuracy:

DeQx

DeQx

Ae

Q

⋅

⋅

±=

m1

2

Q

Ae

= Ae of |Zx|
Qx : Measured Quality Factor Value
De : Relative D Accuracy

15

Accuracy applies when

1

<

⋅

DeQx

Example:
Test Condition:
Frequency : 1KHz
Level : 1Vrms
Speed : Slow
DUT : 1mH
Then

Ω=⋅⋅⋅=

⋅⋅⋅=

−

283.610102

2

33

π

π

LxfZx

Refer to the accuracy table, get
L

Ae

=±0.5%,

005.0

100

±=⋅±=

Ae

De

If measured Qx = 20
Then

1.01

2

1

2

m

m

±=

⋅

⋅

±=

DeQx

DeQx

Q

Ae

θ

Accuracy:

100

Ae

π

180

e ⋅=θ

16

Example:
Test Condition:
Frequency : 1KHz
Level : 1Vrms
Speed : Slow
DUT : 100nF
Then

Ω=

⋅⋅⋅⋅

=

⋅⋅⋅

=

−

1590

10100102

1

2

1

93

π

π

Cxf

Zx

Refer to the accuracy table, get
Z

Ae

=±0.2%,

deg115.0

100

2.0180

100

Ae180

Ae

±=⋅

π

±=

⋅

π

±=θ



Testing Signal:
Level Accuracy : ± 5%
Frequency Accuracy : 0.1%



Output Impedance : 100Ω ± 5%



Measuring Speed:
Fast : 4.5 meas. / sec.
Slow : 2.5 meas. / sec.

17



General:
Temperature : 0

°

C to 70°C (Operating)

-20

°

C to 70°C (Storage)
Relative Humidity : Up to 85%
Battery Type : 2 AA size Ni-Mh or Alkaline
Battery Charge : Constant current 150mA

approximately
Battery Operating Time : 2.5 Hours typical
AC Operation : 110/220V AC, 60/50Hz with

proper adapter
Low Power Warning : under 2.2V
Dimensions : 174mm x 86mm x 48mm (L x W

x H) 6.9” x 3.4” x 1.9”
Weight : 470g

Considerations

Test Frequency. The test frequency is user selectable and can be
changed. Generally, a 1kHz test signal is used to measure
capacitors that are 0.01uF or smaller and a 120Hz test signal is
used for capacitors that are 10uF or larger. Typically a 1 kHz test
signal is used to measure inductors that are used in audio and RF
(radio frequency) circuits. This is because these components
operate at higher frequencies and require that they be measured at
a higher frequency of 1kHz. Generally, inductors below 2mH
should be measured at 1 kHz and inductors above 200H should be
measured at 120Hz.

It is best to check with the component manufacturer’s data sheet to
determine the best test frequency for the device.

18

Charged Capacitors. Always discharge any capacitor prior to
making a measurement since a charged capacitor may seriously
damage the meter.

Effect Of High D on Accuracy.

A low D (Dissipation Factor)
reading is desirable. Electrolytic capacitors inherently have a
higher dissipation factor due to their normally high internal
leakage characteristics. If the D (Dissipation Factor) is excessive,
the capacitance measurement accuracy may be degraded.

It is best to check with the component manufacturers data sheet to
determine the desirable D value of a good component.

Combining Autoranging and Manual Ranging Operation

.
Combining autoranging and manual ranging is a very convenient
way to gain the advantage of both modes. Starting in the
autoranging mode, insert or connect the inductor to be measured,
The instrument quickly steps to the correct range for measurement.
Next, press the

RANGE key to switch to the manual

ranging
mode. The instrument will be on the correct range. The display will
indicate whether a calibration needs to be performed to obtain
optimum accuracy. If not, take the reading. If so, perform the
calibration then take the reading, This method combines the speed
of autoranging and the accuracy of manual ranging and is very
easy and simple to perform.

Series Vs Parallel Measurement (for Inductors).

The MT4080
normally measures inductance in the series equivalent mode. The
series mode displays the more accurate measurement in most cases.

19

The series equivalent mode is essential for obtaining an accurate Q
reading of low Q inductors. Where ohmic losses are most
significant, the series equivalent mode is preferred. However,
there are cases where the parallel equivalent mode may be more
appropriate. For iron core inductors operating at higher frequencies
where hysteresis and eddy currents become significant,
measurement in the parallel equivalent mode is preferred.

1.4 Accessories



Operating Manual 1 pc



2 AA Size Ni-Mh Rechargeable Batteries 2 pcs



Shorting Bar 1 pc



AC to DC Adapter 1 pc



TL08A SMD Test Probe (Optional)



TL08B 4-Wire Test Clip (Optional)



TL08C Kelvin Clip (Optional)



Carrying Case (Optional)

20

2. Operation

2.1 Physical Description

G UA RDPOTH POTL

CUR UARDCUR GLH

1. Infrared Port 2. Primary Parameter Display

3. Secondary Parameter Display 4. Low Battery Indicator

5. Model Number 6. Power Switch

7. Relative Key 8. Measurement Level Key

9. Open/Short Calibration Key 10. Measurement Frequency Key

11. Display Update Speed Key

12. D/Q/

θ

/ESR Function Key

13. Range Hold Key 14. L/C/Z/DCR Function Key

15. Battery Charge Indicator 16. DC Adapter Input Jack

17. Guard Terminal 18. HPOT/HCUR Terminal

19. LPOT/LCUR Terminal 20. Battery Compartment

21

2.2 Making Measurement

2.2.1 Battery Replacement
When the LOW BATTERY INDICATOR lights up during normal

operation, the batteries in the MT4080 should be replaced or
recharged to maintain proper operation. Please perform the
following steps to change the batteries:

1. Remove the battery hatch by unscrewing the screw of the

battery compartment.

2. Take out the old batteries and insert the new batteries into the

battery compartment. Please watch out for battery polarity
when installing new batteries.

3. Replace the battery hatch by reversing the procedure used to

remove it.

1 Screws

2

Battery Compartment

Hatch
3 Batteries
4 Norm/Ni-Mh Switch
5 Back Case
6 Tilt Stand

Battery Replacement

22

2.2.2 Battery Recharging/AC operation

Caution

!

Only the MT4080 standard accessory AC to DC adapter
can be used with MT4080. Other battery eliminator or charger
may result in damage to MT4080.

The MT4080 works on external AC power or internal batteries.
To power the MT4080 with AC source, make sure that the
MT4080 is off, then plug one end of the AC to DC adapter into the
DC jack on the right side of the instrument and the other end into
an AC outlet.

There is a small slide switch inside the battery compartment
called Battery Select Switch. If the Ni-Mh or Ni-Cd rechargeable
batteries are installed in MT4080, set the Battery Select Switch to
"Ni-Mh" position. The Ni-Mh or Ni-Cd batteries can be recharged
when the instrument is operated by AC source. The LED for
indicating battery charging will light on. If the non-rechargeable
batteries (such as alkaline batteries) are installed in MT4080, set
the Battery Select Switch to "NORM" position for disconnecting
the charging circuit to the batteries.

Warning

The Battery Select Switch must be set in the "NORM"
position when using non-rechargeable batteries.
Non-rechargeable batteries may explode if the AC adapter is
used with non-rechargeable batteries. Warranty is voided if
this happened.

23

2.2.3 Open and Short Calibration

The MT4080 provides open/short calibration capability so the
user can get better accuracy in measuring high and low impedance.
We recommend that the user performs open/short calibration if the
test level or frequency have been changed.



Open Calibration
First, remaining the measurement terminals at the open status.
Press the CAL key shortly (no more than two second), the
LCD will display:

This calibration takes about 10 seconds. After it is finished, the
MT4080 will beep to show that the calibration is done.



Short Calibration
To perform the short calibration, insert the Shorting Bar into
the measurement terminals. Press the CAL key for more than
two second, the LCD will display:

This calibration takes about 10 seconds. After it is finished, the
MT4080 will beep to show that the calibration is done.

24

2.2.4 Display Speed

The MT4080 provide two different display speeds (Fast/Slow). It
is controlled by the Speed key. When the speed is set to fast, the
display will update 4.5 readings every second. When the speed is
set to slow, it’s only 2.5 readings per second.

2.2.5 Relative Mode

The relative mode lets the user to make quick sort of a bunch of
components. First, insert the standard value component to get the
standard value reading. (Approximately 5 seconds in Fast Mode to
get a stable reading.) Then, press the Relative key, the primary
display will reset to zero. Remove the standard value component
and insert the unknown component, the LCD will show the value
that is the difference between the standard value and unknown
value.

2.2.6 Range Hold

To set the range hold, insert a standard component in that
measurement range. (Approximately 5 seconds in Fast Mode to get
a stable reading.) Then, by pressing the Range Hold key it will
hold the range within 0.5 to 2 times of the current measurement
range. When the Range Hold is press the LCD display:

25

2.2.7 DC Resistance Measurement

The DC resistance measurement measures the resistance of an
unknown component by 1VDC. Select the L/C/Z/DCR key to
make the DCR measurement. The LCD display:

2.2.8 AC Impedance Measurement

The AC impedance measurement measures the Z of an unknown
device. Select the L/C/Z/DCR key to make the Z measurement.
The LCD display:

The testing level and frequency can by selected by pressing the

Level key and Frequency key, respectively.

2.2.9 Capacitance Measurement

To measure the capacitance of a component, select the L/C/Z/DCR
key to Cs or Cp mode. Due to the circuit structure, there are two
modes can by selected (Serial Mode – Cs and Parallel Mode – Cp).
If the serial mode (Cs) is selected, the D, Q and ESR can be shown
on the secondary display. If the parallel mode (Cp) is selected, only

26

the D and Q can be shown on the secondary display. The following
shows some examples of capacitance measurement:

The testing level and frequency can by selected by pressing the

Level key and Frequency key, respectively.

2.2.10 Inductance Measurement

Select the L/C/Z/DCR key to Ls or Lp mode for measuring the
inductance in serial mode or parallel mode. If the serial mode (Ls)
is selected, the D, Q and ESR can be shown on the secondary
display. If the parallel mode (Lp) is selected, only the D and Q can
be shown on the secondary display. The following shows some
examples of capacitance measurement:

The testing level and frequency can by selected by pressing the

Level key and Frequency key, respectively.

27

2.3 Accessory Operation

Follow the figures below to attach the test probes for making
measurement.

Shorting Bar

TL08A SMD Test Probe

28

H

H

P

C

C

L

L

P

TL08B 4-Wire Test Clip

TL08C Kelvin Clip

29

3. Infrared Operation

There are three operation modes in the infrared operation of
MT4080. They are

Normal, Remote

and

Remote Binning

modes.



Normal

:

The

Normal

mode is the default power on local mode. Press

the

Normal

keys to switch back to local operation from

Remote

or

Remote Binning

modes.



Remote

:

In the

Remote

mode, the MT4080 is capable of communicating
to infrared equipped PC or terminal through the build-in
infrared interface. The connection setting is as follow:
Transmission Mode : Half Duplex
Baud Rate : 9600
Parity Bit : None
Data Bits : 8
Stop Bit : 1
Handshake : None
In this mode, the keyboard and LCD will be locked. And, the
MT4080 measurement is controlled by the external program
through the infrared port.



Remote Binning

:

In the

Remote Binning

mode, the “RMT” on the LCD will
flash. The MT4080 performs a TALK ONLY instrument.
Which means, the measurement of MT4080 is controlled by
instrument keys, but the measured value will display on the
LCD as well as output to the infrared port. By this way, the
user can purchase the optional application program provided by
Motech to obtain the GO/NO GO comparator and the
component sorting comparator.

30

3.1 Command Syntax

The command syntax of MT4080 is as following:

COMMAND(?) (PARAMETER)

The format of COMMAND and PARAMETER is as following:

1. There is at least one space between COMMAND and
PARAMETER.

2. The PARAMETER should use only ASCII string not numerical
code.

3. Value parameter can be integer, floating or exponent with the
unit. For example:
50mV

0.05V

5.0e1mV

4. The question mark (?) at the end of COMMAND means a
query or measure back command. For example:
“CpD” sets the measurement mode to Cp and D.
“CpD?” sets the measurement mode to Cp and D as well as
measures the values and send it back.

5. The COMMAND and PARAMETER can be either upper or
lower case. But the unit to describe the value in the
PARAMETER should have different between milli (m) and
mega (M). For example:
1mV equals 0.001V.
1MV equals 1000000V.

6. The “end of command” character should placed at the end.
There are:
ASCII CR (0DH) or
ASCII LF (0AH)

31

3.2 Commands

Measurement Setting (or Querying) Command

There are 17 measurement setting (or querying) commands. They
are as following:



DCR(?)

DC resistance measurement mode setting or

querying command.



CpRp(?)

Parallel capacitance and parallel resistance

measurement mode setting or querying command.



CpQ(?)

Parallel capacitance and quality factor

measurement mode setting or querying command.



CpD(?)

Parallel capacitance and dissipation factor

measurement mode setting or querying command.



CsRs(?)

Serial capacitance and serial resistance

measurement mode setting or querying command.



CsQ(?)

Serial capacitance and quality factor measurement

mode setting or querying command.



CsD(?)

Serial capacitance and dissipation factor

measurement mode setting or querying command.



LpRp(?)

Parallel inductance and parallel resistance

measurement mode setting or querying command.



LpQ(?)

Parallel inductance and quality factor measurement

mode setting or querying command.



LpD(?)

Parallel inductance and dissipation factor

measurement mode setting or querying command.



LsRs(?)

Serial inductance and serial resistance

measurement mode setting or querying command.



LsQ(?)

Serial inductance and quality factor measurement

mode setting or querying command.



LsD(?)

Serial inductance and dissipation factor

measurement mode setting or querying command.

32



RsXs(?)

Serial resistance and serial reactance measurement

mode setting or querying command.



RpXp(?)

Parallel resistance and parallel reactance

measurement mode setting or querying command.



ZTD(?)

Impedance and angle (Deg) measurement mode

setting or querying command.



ZTR(?)

Impedance and angle (Rad) measurement mode

setting or querying command.
Example:
CPD (

set to Cp-D measurement mode)

CPD?

0.22724 0.12840 (

return value

)

DCR?

5.1029 (

return value

)

*IDN?

Queries and identifies the MT4080. This command is used to
identify the basic information of MT4080. The return value has
four fields separated by comma (,). The total length will not greater
than 100 characters. The four fields are:

1. Manufacturer Name

2. Model Number

3. Serial Number

4. Firmware Number
Example:

MOTECH,MT4080A,123456789,4.096

33

*RST

Resets the MT4080 to the power on default status. The default
status is:
1KHz 1Vrms SLOW CpD uF mH Ohm
After the MT4080 is reset, it will beep once and returns the
“BEEP” string back.

ASC

Sets the format of the return value. This command sets the ASCII
string return or the numerical code.
PARAMET ER:
ON ASCII string
OFF Numerical code
Example:
ASC ON
FREQ?
1KHz (

return value

)

ASC OFF
FREQ?

2 (

return value

)

CORR OPEN

Performs the open calibration. This command sets the MT4080 to
do the open calibration. After the calibration is done, the MT4080
will beep once and returns the “BEEP” string back.

CORR SHORT

Performs the short calibration. This command sets the MT4080 to
do the short calibration. After the calibration is done, the MT4080
will beep once and returns the “BEEP” string back.

34

FREQ(?) PARAMETER

Sets (queries) the measurement frequency.



FREQ PARAMETER

Sets the measurement frequency according to the parameter.
There is no return value.
PARAMET ER:

ASCII string Numerical code
100Hz 0
120Hz 1
1KHz 2
10KHz 3
100KHz 4

Example:

FREQ 100KHz



FREQ?

Returns the current measurement frequency setting.
Example:

ASC ON
FREQ?
1KHz (

return value

)

ASC OFF
FREQ?
2 (

return value

)

LEV(?) PARAMETER

Sets (queries) the measurement level.



LEV PARAMETER

Sets the measurement level according to the parameter. There
is no return value.

35

PARAMET ER:

ASCII string Numerical code
1VDC 0
1Vrms 1
250mVrms 2
50mVrms 3

Example:

LEV 1V



LEV?

Returns the current measurement level setting.
Example:
ASC ON
LEV?
1Vrms (

return value

)

ASC OFF
LEV?
1 (

return value

)

MODE?

Queries the measurement mode. Six fields will be returned.

1. Frequency

2. Level

3. Speed

4. Measurement mode

5. Unit of primary display

6. Unit of secondary display
The existence of field 6 depends on the measurement mode. For
example, there’s no field 6 if the measurement mode is DCR. The
separation between fields is space (ASCII 20H).

36

Example:
ASC ON
CPD
MODE?
1KHz 1Vrms SLOW CpD uF (

return value

)

ASC ON
CPRP
MODE?
1KHz 1Vrms SLOW CpRp uF Ohm (

return value

)

RANG(?) PARAMETER

Sets (queries) the measurement unit.



RANG PARAMETER

Sets the measurement unit according to the parameter. There is
no return value.
PARAMET ER:

ASCII string Numerical code
pF 0
nF 1
uF 2
mF 3
F 4
nH 8
uH 9
mH 10
H 11
KH 12
mOhm 17
Ohm 18
KOhm 19
MOhm 20

Example:

RANG pF

37



RANG?

Returns the current measurement unit setting.
Example:

ASC ON
RANG?
pF (

return value

)

ASC OFF
RANG?
0 (

return value

)

READ?

Returns the measurement value. This command will perform a
measurement according to the current measurement mode and
return the measured value.
Example:
CPD
READ?

0.22724 0.12840 (

return value

)

DCR
READ?

5.1029 (

return value

)
The “DCR” measurement will send only one measured value. The
other measurement modes will send two measured values
separated by space (ASCII 20H).

38

SPEED(?) PARAMETER

Sets (queries) the measurement speed.



SPEED PARAMETER

Sets the measurement speed according to the parameter.
There is no return value.
PARAMET ER:
ASCII string Numerical code
SLOW 0
FAST 1
Example:

SPEED FAST



SPEED?

Returns the current measurement speed setting.
Example:

ASC ON
SPEED?
SLOW (

return value

)

ASC OFF
SPEED?
0 (

return value

)

39

4. Application

4.1 Test Leads Connection

Auto balancing bridge has four terminals (H

CUR

, H

POT

, L

CUR

and

L

POT

) to connect to the device under test (DUT). It is important to
understand what connection method will affect the measurement
accuracy.



2-Terminal (2T)
2-Terminal is the easiest way to connect the DUT, but it
contents many errors that are the inductor and resistor as well
as the parasitic capacitor of the test leads (Figure 3.1). Due to
these errors in measurement, the effective impedance

measurement range will be limited at 100

Ω

to 10KΩ.

R

H

CUR

H

POT

DUT

(b) BLOCK DIAGRAM

DUT

V

A

Co

o

L

o

R

o

L

o

(a) CONNECTION

(c) TYPICAL IMPEDANCE MEASUREMENT RANGE(£[)

2T

1m 10m 100m 1 10 1K 10K 100K 1M100 10M

L

POT

L

CUR

Figure 3.1

40



3-Terminal (3T)
3-Terminal uses coaxial cable to reduce the effect of the
parasitic capacitor (Figure 3.2). The shield of the coaxial cable
should connect to guard of the instrument to increase the

measurement range up to 10M

Ω

.

DUT

V

A

(d) 2T CONNECTION WITH SHILDING

H

CUR

H

POT

DUT

(b) BLOCK DIAGRAM

DUT

V

A

Co

R

o

L

o

R

o

L

o

Co doesn't
effect
measurement
result

(a) CONNECTION

(c) TYPICAL IMPEDANCE MEASUREMENT RANGE(£[)

3T

1m 10m 100m 1 10 1K 10K 100K 1M100 10M

L

POT

L

CUR

Figure 3.2

41



4-Terminal (4T)
4-Terminal connection reduces the effect of the test lead
resistance (Figure 3.3). This connection can improve the

measurement range down to 10m

Ω

. However, the effect of the

test lead inductance can’t be eliminated.

H

CUR

H

POT

DUT

(b) BLOCK DIAGRAM

DUT

V

A

(a) CONNECTION

(c) TYPICAL IMPEDANCE MEASUREMENT RANGE (£[)

4T

1m 10m 100m 1 10 1K 10K 100K 1M100 10M

L

POT

L

CUR

Figure 3.3



5-Terminal (5T)
5-Terminal connection is the combination of 3T and 4T (Figure

3.4). It has four coaxial cables. Due to the advantage of the 3T
and 4T, this connection can widely increase the measurement

range for 10m

Ω

to 10MΩ.

42

(d) WRONG 4T CONNECTION

H

POT

DUT

(b) BLOCK DIAGRAM

(a) CONNECTION

(c) TYPICAL IMPEDANCE MEASUREMENT RANGE (£[)

5T

1m 10m 100m 1 10 1K 10K 100K 1M100 10M

H

CUR

DUT

V

A

DUT

V

A

L

POT

L

CUR

Figure 3.4



4-Terminal Path (4TP)
4-Terminal Path connection solves the problem that caused by
the test lead inductance. 4TP uses four coaxial cables to isolate
the current path and the voltage sense cable (Figure 3.5). The
return current will flow through the coaxial cable as well as the
shield. Therefore, the magnetic flux that generated by internal
conductor will cancel out the magnetic flux generated by

43

external conductor (shield). The 4TP connection increases the
measurement range from 1m

Ω

to 10MΩ.

(b) BLOCK DIAGRAM

(a) CONNECTION

DUT

V

A

(c) TYPICAL IMPEDANCE

MEASUREMENT RANGE(£[)

4T

1m 10m100m 1 10 1K 10K 100K 1M100 10M

H

POT

DUT

H

CUR

L

CUR

L

POT

H

POT

DUT

H

CUR

L

CUR

L

POT

(d) 4T CONNECTION WITH SHILDING

Figure 3.5



Eliminating the Effect of the Parasitic Capacitor
When measuring the high impedance component (i.e. low
capacitor), the parasitic capacitor becomes an important issue
(Figure 3.6). In figure 3.6(a), the parasitic capacitor Cd is
paralleled to DUT as well as the Ci and Ch. To correct this
problem, add a guard plane (Figure 3.6(b)) in between H and L
terminals to break the Cd. If the guard plane is connected to
instrument guard, the effect of Ci and Ch will be removed.

44

(a) Parastic Effect

H

CUR

H

POT

L

POT

L

CUR

Cd

Connection

Point

DUT

C

h

C

l

Ground

(b) Guard Plant reduces

Parastic Effect

H

CUR

H

POT

L

POT

L

CUR

Guard

Plant

Figure 3.6

4.2 Open/Short Compensation

For those precision impedance measuring instrument, the open and
short compensation need to be used to reduce the parasitic effect of
the test fixture. The parasitic effect of the test fixture can be treated
like the simple passive components in figure 3.7(a). When the

DUT is open, the instrument gets the conductance Yp = Gp + j

ω

Cp

(Figure 3.7(b)). When the DUT is short, the instrument gets the
impedance Zs = Rs + j

ω

Ls (Figure 3.7(c)). After the open and
short compensation, Yp and Zs are for calculating the real Zdut
(Figure 3.7(d)).

45

H

CUR

H

POT

L

CUR

L

POT

Zdut

C

o

R

s

L

s

G

o

Z

m

Redundant
Impedance

(Z

s

)

Parastic
Conductance

(Y

o

)

Parastic of the Test Fixture

(a) Parastic Effect of the Test Fixture

H

CUR

H

POT

L

CUR

L

POT

C

o

R

s

L

s

G

o

(b) OPEN Measurement

Y

o

OPEN

Y

o

= Go + j£sC

o

1

(R

s

+ j£s<< )

G

o

+j£sC

o

H

CUR

H

POT

L

CUR

L

POT

C

o

R

s

L

s

G

o

(c) SHORT Measurement

Z

s

SHORT

Zs = Rs + j£sL

s

Figure 3.7

46

Z

m

Y

o

Zdut

Zm - Z

s

Zdut =
1-(Z

m-Zs)Yo

(d) Compensation Equation

Z

s

Figure 3.7 (Continued)

4.3 Selecting the Series or Parallel Mode

According to different measuring requirement, there are series
and parallel modes to describe the measurement result. It is
depending on the high or low impedance value to decide what
mode to be used.



Capacitor
The impedance and capacitance in the capacitor are negatively
proportional. Therefore, the large capacitor means the low
impedance, the small capacitor means the high impedance.
Figure 3.8 shows the equivalent circuit of capacitor. If the
capacitor is small, the Rp is more important than the Rs. If the
capacitor is large, the Rs shouldn’t be avoided. Hence, uses
parallel mode to measure low capacitor and series mode to
measure high capacitor.

47



Inductor
The impedance and inductive in the inductor are positively
proportional. Therefore, the large inductor equals to the high
impedance and vice versa. Figure 3.9 shows the equivalent
circuit of inductor. If the inductor is small, the Rs is more
important than the Rp. If the inductor is large, the Rp should be
taking care of. So, uses series mode to measure low inductor
and parallel mode to measure high inductor.

Small capacitor
(High impedance)

R

P

C

R

S

Effect

No Effect

Large capacitor
(Low impedance)

R

P

C

R

S

Effect

No Effect

Figure 3.8

48

Figure 3.9

Small inductor
(Low impedance)

R

P

L

R

S

Large inductor
(High impedance)

Effect

No Effect

R

P

L

R

S

No Effect

Effect

49

5. Warranty Information

ONE-YEAR-LIMITED WARRANTY

MOTECH INDUSTRIES INC. (MOTECH) warrants to the
original user or purchaser that the unit is free from any defects in
material or workmanship for a period of one year from the date of
purchase. If any defect is discovered within the warranty period,
MOTECH will repair or replace the unit, subject to verification of
the defect or malfunction, upon delivery or prepaid shipment to
MOTECH.

This warranty does not apply to defects or to physical damage
resulting from abuse, neglect, accident, improper repair, alteration,
or unreasonable use of the unit, resulting in (but not limited to)
cracked or broken case or parts, or to units damaged by excessive
heat. Except upon initial purchase, this warranty does not cover
finish or appearance items nor does it cover items damaged in
shipment to MOTECH for repair or calibration.

To receive service under this warranty, you must include proof of
purchase, including date and place of purchase, (a copy of your
purchase receipt) or MOTECH will not be responsible for repairs
or replacement of the unit under warranty.

Any applicable implied warranties, including warranties of
merchant ability and fitness for a particular use, are hereby limited
to one year from the date of purchase. Consequential or
incidental damages resulting from loss of use, or from a breach of
any applicable express or implied warranties are hereby excluded.

50

The warranty is in lieu of all other agreements and warranties,
general or special, express or implied no representative or person is
authorized to assume for us any other liability in connection with
the sale or use of this MOTECH product.

51

6. Safety Precaution

SAFETY CONSIDERATIONS

The MT4080 LCR Meter has been designed and tested according
to Class 1A 1B or 2 according to IEC479-1 and IEC 721-3-3,
Safety requirement for Electronic Measuring Apparatus.

SAFETY PRECAUTIONS
SAFETY NOTES

The following general safety precautions must be observed during
all phases of operation, service, and repair of this instrument.
Failure to comply with these precautions or with specific warnings
elsewhere in this manual violates safety standards of design,
manufacture, and intended use of the instrument.
The manufacturer assumes no liability for the customer‘s failure to
comply with these requirements.

BEFORE APPLYING POWER

!

Verify that the product is set to match the available line voltage is
installed.

52

SAFETY SYMBOLS

Caution, risk of electric shock

Earth ground symbol

Equipment protected throughout by double
insulation or reinforced insulation

!

Caution (refer to accompanying documents)

DO NOT SUBSTITUTE PARTS OR MODIFY
INSTRUMENT

Because of the danger of introducing additional hazards, do not
install substitute parts or perform any unauthorized modification to
the instrument. Return the instrument to a qualified dealer for
service and repair to ensure that safety features are maintained.

INSTRUMENTS THAT APPEAR DAMAGED OR
DEFECTIVE SHOULD BE MADE INOPERATIVE AND
SECURED AGAINST UNINTENDED OPERATION UNTIL
THEY CAN BE REPAIRED BY QUALIFIED SERVICE
PERSONNAL.

ZOM-408MT-1