Dranetz-BMI DranTech PMIT User manual

User’s Guide
DranTech PMIT
Precision Milliohm Insulation Resistance Tester
Digital Multimeter and Data Logger
M227I
© 2007 Rev. A

2 DranTech PMIT User’s Guide
1Display(LCD)
2ON|OFFkey
Operating mode menu:
open submenus / acknowledge entries;
background illumination ON / OFF
3 DATA|CLEAR key for following functions: save measured
value, delete and MIN/MAX
Operating mode menu:
Selection of individual menu items
a
gainst direction of flow, increase values
4 MAN|AUTO key for manual measuring range selection
Operating mode menu: Selection of individual menu items
in direction of flow, decrease values
5 FUNC
key for selecting functions, start key INS measurement
Operating mode menu: Exit menu level and return to a higher level,
exit parameters configuration without saving data
6 Rotary selector switch for measuring function
7 Connector jacks *
8
Connector jacks for mains power battery charger NA HIT2x
(only with rechargeable batteries inserted)
*
⊥ Earthing input
S- Sense –, for 4-wire connection only with
Ω /m Ω /m Ω @ 1A
S+ Sense +, for 4-wire connection only with Ω/ m Ω /m Ω @1A
V;
Ω ; ° C, M Ω measurement input
Symbols used in the Digital Display
1 Main display with decimal point and polarity display
2 Auxiliary display with decimal point and polarity display
3 : Multimeter in continuous operation,
ON blinks at transmission frequency in transmission mode
4REM: Memory mode operation, disappears after communication
via the interface is ended by means of key or switch operation
5 ZERO: Zero balancing
6 MAN: Manual measuring range selection
7 Unit of measure (if blinking, refer to chapter 11.2 on page 16
and chapter 15 on page 26)
8 MIN/MAX: Display of smallest/largest recorded values
with time specification
9 : Acoustic signal enabled,
beeper is activated for corresponding function
10 :
Low rechargeable battery voltage (< 3.3 V), recharge
rechargeable batteries
Standard Equipment
1
2
3
4
5
6
8
7
7
max. 600 V !
Type 27I
Article Number M227B
Instrument: DranTech PMIT 27I
3 size AA NiMH Rechargeable Batteries •
KS17S measurement cable set •
operating instructions •
abbreviated operating instructions •
GH18 protective rubber cover with
carrying strap •
DKD calibration certificate •
Charging unit NA HIT2x •
Kelvin probes KC27 (1 set = 2 each) —
Hard case HC30 —
BD pack (including adapter, cable and
DranWin
®
10‚ software) —
1
10
9
64 53
7
8
2

DranTech PMIT User’s Guide 3
Table of Contents Page Page
1 Safety Features and Precautions ........................ 4
2 Initial Start-Up ....................................................5
3 Selecting Measuring Functions and Measuring
Ranges ................................................................... 6
3.1 Automatic Measuring Range Selection ........................... 6
3.2 Manual Measuring Range Selection ................................ 6
3.3 Quick Measurements ....................................................... 7
4 Triple Digital Display .......................................... 7
5 Measured Value Storage ..................................... 8
5.1 Measured Value Storage – Key Function “DATA”
(Hold/Compare) ............................................................... 8
6 Saving Minimum and Maximum Values
“MIN/MAX” with Time Stamp .......................... 9
7 Voltage and Frequency Measurement .............10
7.1 Voltage Measurement [V] ............................................. 10
7.1.1 Zero Balancing in the 3 V DC Measuring Range ..........10
7.1.2 Transient Overvoltages ..................................................10
7.2 Frequency Measurement [Hz] ....................................... 11
8 Resistance and Diode Measurements ............... 11
8.1 Resistance Measurement (2-wire connection) [Ω] ........ 11
8.1.1
Zero Balancing in the 300 Ω and 3 k Ω Measuring Ranges 11
8.2 Continuity Test during Resistance Measurement ......... 12
8.3 Diode Measurements .................................................... 12
9 Milliohm Measurement (4-Pole-Measurement) 13
9.1 Compensation of Cable Resistance ................................13
9.1.1 Measurement with Kelvin Probe KC27 ........................ 13
9.2 Thermovoltage Compensation .......................................13
9.3
Milliohm Measurement with 200 mA or 20 mA DC [m Ω ] 14
9.4 Milliohm Measurement with 1 A Pulsating Measuring
Current [mΩ@1 A]
(automatic thermovoltage correction in 3 … 300 m Ω range) 14
10 Temperature Measurement [ ° C] ...................... 14
11
Insulation Resistance Measurement [M Ω @...V] ....15
11.1 Preparing for Measurement ............................................15
11.2 Insulation Resistance Measurement ...............................16
11.3 Ending the Measurement and Discharging ....................16
12 Using the Menus – from the Initial InFO Menu to
Operating and Measuring Parameters ............17
12.1 Sampling rAtE ................................................................17
12.2 Saving Measured Values ................................................17
12.2.1MemoryMode –DATAKeyFunction (seealsochapter5.1)
17
12.2.2Memory Mode Operation – STORE Menu Function ....18
12.3
Querying Memory Occupancy – INFO  MEMO/OCCUP 18
12.4 Clearing the Memory – MEMO CLEAr ....................18
12.5 Activating the Default Values ........................................18
12.6 Transmission Mode Operation with RS 232 Interface ...19
13 Characteristic Values .........................................22
14 Maintenance .......................................................25
14.1 Rechargeable Batteries and Batteries .............................25
14.2 Fuses ...............................................................................26
14.3 Housing ..........................................................................26
14.4
Device Return and Environmentally Compatible Disposal 26
15 Multimeter Messages .........................................26
16 Accessories ..........................................................27
17 Repair and Replacement Parts Service,
DKD Calibration Lab and Rental Instrument
Service .................................................................27
18 Warranty .............................................................28
19 Product Support .................................................28

4 DranTech PMIT User’s Guide
1 Safety Features and Precautions
You have selected an instrument which provides you with high
levels of safety.
This instrument fulfills the requirements of the applicable
European and national EC guidelines. We confirm this with the
CE marking. The relevant declaration of conformity can be
obtained from Dranetz-BMI.
DranTech PMIT is manufactured and tested in accordance with
safety regulations IEC 61010–1:2001 / DIN EN 61010–1:2001 /
VDE 0411–1:2002. When used for its intended purpose, safety of
the operator, as well as that of the instrument, is assured. Their
safety is however not guaranteed, if the instrument is used
improperly or handled carelessly.
In order to maintain flawless technical safety conditions, and to
assure safe use, it is imperative that you read the operating
instructions thoroughly and carefully before placing your
instrument into service, and that you follow all instructions
contained therein.
Observe the following safety precautions:
• The instrument may only be operated by persons who are
capable of recognizing contact hazards and taking the
appropriate safety precautions. Contact hazards exist
anywhere, where voltages of greater than 33 V (RMS) may
occur.
• Avoid working alone when taking measurements which
involve contact hazards. Be certain that a second person is
present.
Attention!
!Maximum allowable voltage between any given
connector jack and earth is 600 V, category II.
Attention!
!Nominal system voltage may not exceed 600 V. Voltage
measurements may only be performed with the selector
switch set to the V or the V~ position.
If the multimeter sockets are confused with the sense
sockets, the instrument may be damaged and the
operator may be subjected to danger!
Attention!
!Contact hazard!
Dangerous voltages at the external jacks may be looped
through to the sense sockets during voltage
measurement. Therefore do not touch the sense sockets.
• Be prepared for the occurrence of unexpected voltages at
devices under test (e.g. defective devices). For example,
capacitors may be dangerously charged.
• Make certain that the measurement cables are in flawless
condition, e.g. no damage to insulation, no interruptions in
cables or plugs, etc.
• No measurements may be made with this instrument in
electrical circuits with corona discharge (high-voltage).
• Special care is required when measurements are made in HF
electrical circuits. Dangerous pulsating voltages may be
present.
• Measurements under moist ambient conditions, or with an
instrument with condensation moisture are not permitted.
• Be absolutely certain that the measuring ranges are not
overloaded beyond their allowable capacities. Limit values
are listed in chapter 13 on page 22.
• The instrument may only be used in power installations if the
electrical circuit is protected with a fuse or circuit breaker
with a maximum rating of 20 A, and the nominal voltage of
the installation does not exceed 600 V.
• Maximum allowable interference voltage between the jacks
(7) and earth briefly amounts to 600 V
RMS
in all selector
switch positions in the event of an error. The fuse blows at an
interference voltage value of > 3 V in the mΩrange.
• Be prepared for the occurrence of unexpected voltages at
devices under test (e.g. defective devices, after testing coil
resistance at contactors etc.), for example, capacitors may be
dangerously charged. In the interest of safety, always test for
the absence of voltage first with the selector switch in the
V and V~ positions.
• In order to avoid damage to the instrument when interference
voltages are applied (within allowable limit values), the mΩ
measuring circuit is equipped with an F1.6A/1000 V fuse,
which makes this measuring circuit highly resistive if
excessive current should occur in the event of a fault for the
duration of overloading.
• Do not plug the mains power battery charger into the
instrument if normal batteries have been installed instead of
rechargeable batteries.
Warning!
The instrument may not be operated in explosive
atmospheres, or connected to intrinsically safe electrical
circuits.

DranTech PMIT User’s Guide 5
Meanings of symbols on the instrument:
Warning concerning a source of danger
(attention: observe documentation!)
Ground
Mains power battery charger connection for
recharging Rechargeable Batteries
Continuous, doubled or reinforced
insulation
CAT II Measurement category II device
Indicates EC conformity
This device may not be disposed with the trash. For
further details on the WEEE marking, please refer to
our website www.dranetz-bmi.com and enter search
term “WEEE”.
DKD calibration certificate (red label):
Repair, Parts Replacement and Balancing
When the instrument is opened, voltage conducting parts may be
exposed. The instrument must be disconnected from the
measuring circuit before the performance of repairs, the
replacement of parts, or balancing. If balancing, maintenance or
repair of a live open instrument is required, this may only be
carried out by trained personnel who are familiar with the dangers
involved.
Defects and Extraordinary Strains
If it may be assumed that the instrument can no longer be
operated safely, it must be removed from service and secured
against unintentional use.
Safe operation can no longer be relied upon,
• If the instrument or the test probes are damaged
• If the instrument no longer functions
• After long periods of storage under unfavorable conditions
(e.g. humidity, dust, or excessive temperature), see “Ambient
Conditions,” page 24.
2 Initial Start-Up
Rechargeable Batteries or Batteries
Refer to chapter 14.1 regarding correct rechargeable battery or
battery installation.
Warning!
The mains power battery charger may not be connected if
normal batteries (which are not suited for recharging) have
been inserted: Danger of explosion!
Attention!
!As a result of internal voltage monitoring, the instrument
may respond as follows if the battery charge level is low:
– Cannot be switched on
– Shuts back down immediately
– Shuts back down immediately when a load is applied
in the mΩrange
If this is the case, replace or recharge the rechargeable
batteries.
Attention!
!The mains power battery charger may only be used to
recharge the rechargeable batteries!
Mains power battery chargers with an output voltage of
greater than 5 V may not be used. The milliohmmeter’s
internal voltage regulator might otherwise be destroyed. No
guarantee claims can be accepted if any mains power
battery charger other than the
NA HIT2x is used (available
as an accessory).
Switching the Instrument On Manually
➭Press the ON|OFF key.
As long as the key is held depressed, all of the segments at
the LCD are illuminated. The LCD is shown on page 2.
Power-up is acknowledged with a brief acoustic signal.
The
instrument is ready for use as soon as the key is released.
Switching the Instrument On with a PC
After transmission of a data frame from the PC, the multimeter is
switched on. See also chapter 12.6.
Switching the Instrument On Automatically
The multimeter is switched on automatically in the transmission
and memory modes.
Note!
Electrical discharge and high frequency interference may
cause incorrect displays to appear, and may disable the
measuring sequence. In such cases, switch the instrument
off and back on again in order to reset. If the problem
persists, briefly dislodge the rechargeable batteries from
the connector contacts.
!
+
Consecutive number
Registration number
Date of calibration (year - month)
German calibration service calibration laboratory
B0730
01-08
DKD-K-
19701

6 DranTech PMIT User’s Guide
Setting Time and Date
See chapter 12 on page 17.
Switching the Instrument Off Manually
➭Press and hold the ON|OFF key until OFF appears at the
display.
Shutdown is acknowledged with two, brief acoustic signals.
Switching the Instrument Off Automatically – SLEEP MODE
The instrument is switched off automatically if none of the keys
or the rotary switch are activated for approximately 10 minutes.
Shutdown is acknowledged with a brief acoustic signal.
Transmission mode: In this case, checking is first performed to
determine whether or not the sampling rate has been set to a value
of greater than 10 s. The instrument is switched off after 10
minutes, but the instrument is reactivated 10 s before data is to be
saved to memory. The instrument is then switched back off again.
In the transmission mode, the instrument can be manually
activated with the ON|OFF key. After activation of this type, the
instrument returns to the “SLEEP MODE”.
If the instrument is to be fully shut down, it must first be activated
and then switched off with the ON|OFF key. This ends both
memory mode and transmission mode operation.
We recommend setting the instrument to continuous operation for
transmission mode operation.
The continuous operation mode is not effected by automatic
shutdown.
Disabling Automatic Shutdown
The instrument can be set to continuous operation.
➭Press and hold the FUNC key and then switch the instrument
on by pressing the ON|OFF key. Continuous operation is
indicated at the display with the symbol.
Switching LCD Illumination On and Off
➭Briefly press the ON|OFF key after the instrument has
already been switched on.
Illumination is switched off automatically after approximately 2
minutes.
Note: Electrical discharge and high frequency interference may
cause incorrect displays to appear, and may disable the measuring
sequence. In such cases, switch the instrument off and back on
again in order to reset. If the problem persists, briefly dislodge the
rechargeable batteries or batteries from the connector contacts.
Disconnect the instrument from the measuring circuit before
opening and refer to chapter 14.1, “Rechargeable Batteries and
Batteries”!
3 Selecting Measuring Functions and Measuring
Ranges
3.1 Automatic Measuring Range Selection
The multimeter is equipped with auto-ranging for all measuring
ranges, except for temperature measurement, and diode and
continuity testing. Auto-ranging is active as soon as the
multimeter is switched on. The instrument automatically selects
the measuring range which allows for highest possible resolution
for the applied quantity. When the instrument is switched to
frequency measurement, the previously selected voltage
measuring range remains active.
The instrument automatically switches to the next highest or next
lowest measuring range for the following measured quantities:
3.2 Manual Measuring Range Selection
Auto-ranging can be deactivated and measuring ranges can be
selected manually in accordance with the following table.
The manual mode is deactivated by pressing and holding the
MAN|AUTO key (approx. 1 s), by activating the rotary switch,
or by switching the instrument off and then back on again.
Automatic range selection is disabled as long as the
MIN/MAX function is active.
Measuring Ranges Resolu-
tion
Switching to next
highest range
at ±(... d +1 d)
Switching to next
lowest range
at ±(... d -1 d)
V~, V , Hz, Ω, mΩ,
30 / 300 mΩat 1 A 4¾ 31,000 2800
3 mΩ@1A, MΩ@...V 3¾ 3100 280
⇓
MAN|
AUTO
Function
Acknow-
ledgement
Dis-
play
Acoust.
Signal
short Manual mode active:
utilized measuring range is fixed MAN 1 x
short
Range switching sequence for:
V: 3 V →30 V →300 V →600 V → 3V→…
Hz: 300 Hz →3kHz→300 Hz → …
Ω: 30 M Ω→ 300 Ω→ 3k Ω→ 30 k Ω→ 300k Ω→ 3M Ω→ …
mΩ:30mΩ→300 mΩ→3Ω→30 Ω→30 mΩ→…
mΩ@1A: 3 mΩ→30 mΩ→300 mΩ→3mΩ→…
MAN 1 x
long Return to automatic range selection
—
2 x

DranTech PMIT User’s Guide 7
3.3 Quick Measurements
If you wish to perform quicker measurements than those possible
with the automatic measuring range selection function,make sure
to establish the appropriate measuring range:
• by manual measuring range selection, i. e. by selecting the
measuring range with the best resolution, see chapter 3.2.
or
• via DATA function, see chapter 5. After the first measure-
ment, the proper measuring range will be automatically
determined so that measurements are performed more rapidly
from the second measured value onwards.
With both functions, the established measuring range is main-
tained for the subsequent series mode measurments.
4 Triple Digital Display
The three digital displays (1 main display and 2 auxiliary
displays) show the measured value with decimal and plus or
minus sign. The selected unit of measure is displayed as well. A
minus sign appears to the left of the value during the
measurement of zero-frequency quantities, if the plus pole of the
measured quantity is applied to the “⊥” input.
“OL” (overload) appears if the measuring range upper limit is
exceeded for the following measured quantities:
V AC, V DC, Hz, Ω,
, mΩ, 30 / 300 mΩat 1 A: 30999
3 mΩat 1 A, , MΩ
@ ...V: 3099
The digital display is refreshed at different frequencies for the
various measured quantities.
The main display appears immediately after the multimeter is
switched on, but the auxiliary displays have to be activated by
pressing the DATA|CLEAR key (except for position MΩ@...V,
where the auxiliary displays appear immediately upon selecting
the function).
This assures that any undefined existing condition which
prevailed when measurement was started is not continuously
displayed as a maximum value, e.g. no-load operation.
In the following flowcharts, the initial displays are highlighted
through the use of a bold border line.
23.000
MIN MAX
10.000 24.000
V
Auxiliary Display MIN
Main Display
Auxiliary Display MAX

8 DranTech PMIT User’s Guide
5 Measured Value Storage
The DranTech PMIT provides two entirely different options for
storing data:
• Measured Value Memory – DATA Key Function:
Each time a measuring point is contacted, a measured value
is stored in accordance with a defined condition (see chapter
5.1).
• Memory Mode Operation – STORE Menu Function:
After activating the STORE menu function, all measured
values are saved in accordance with the selected sampling
rate. Memory mode operation is ended manually using the
same menu function, see chapter 12.2.
In both cases, saved measured values can be read out with the
help of DranWin
®
10 PC software (as of version 5.22). However,
read-out is only possible if a USB-HIT adapter has been plugged
into the DranTech PMIT and connected to the PC with an inter-
face cable.
5.1 Measured Value Storage – Key Function “DATA”
(Hold/Compare)
Measured values can be automatically “frozen” with the DATA
hold function. This is useful when, for example, contacting the
measuring points with the test probes requires your full attention.
Memory should be cleared before starting a measurement series
with the DATA key function.
This assures, on the one hand, that adequate memory capacity is
available and, on the other hand, that only data from the last mea-
surement series are read out in a contiguous fashion. Check cur-
rent memory occupancy to this end:
INFO MEMO/OCCUP
Clear memory if required: MEMO CLEAr.
After the measured value has been applied and the corresponding
“condition” from the table below has been fulfilled, the measured
value appears at the left-hand auxiliary display and 2 acoustic
signals are generated. At the same time, “MAN” appears,
indicating that the measuring range is now fixed. The test probes
can now be removed from the measuring points, and the
measured value can be read from the auxiliary display. If the
measured value is less than the value specified in the table, the
instrument is reactivated for storage of the next value and “data”
blinks at the display. The measured value is saved to non-volatile
memory, which is acknowledged by an acoustic signal in each
case.
Comparison of measurement values (DATA Compare)
If the newly stored measurement value deviates less than 0.33%
of the measuring range from the first measurement value, the
acoustic signal (DATA Compare) sounds twice.
If it deviates more than 0.33% from the measuring range, only a
brief signal sonds.
1)
Reactivation results from falling short of specified measured value limits.
2)
When a measurement value is stored for the first time as a reference value, the
acoustic signal sounds twice.
For subsequent data hold, two acoustic signals are only generated if the currently
frozen value deviates from the fist saved value by less than 0.33% of the measuring
range, depending upon resolution.
Key
R = measuring range, MV = measured value
As long as the DATA function is active, the measuring ranges
should not be changed manually.
The DATA function is deactivated if the DATA|CLEAR key is
pressed and held (approx. 1 s), by turning the rotary switch or by
switching the instrument off and back on again.
Function
DATA
⇓
DATA
Condition Response at Instrument
Measur-
ing Func-
tion
Measurement
Value
Sub-Display Acoustic
Signal
Meas.
Value
dAtA
Switch on brief
is
displayed
brief
Store
(stabilized
measure-
ment value)
V, Hz > 10% of MR is
displayed brief
2x
2)
Ω,
0L
Reactivate
1)
V, Hz < 10% of MR stored
meas.
value blinks
Ω,
0L
Switch to
function
MIN/MAX brief see Table chapter 6
Quit long is
deleted is deleted 2x
Acoustic Signal
30.000
20.000 dAtA
V
30.000
MIN MAX
20.000 30.000
V
DATA
DATA
MAN

DranTech PMIT User’s Guide 9
6 Saving Minimum and Maximum Values
“MIN/MAX”
with Time Stamp
Minimum and maximum values can be displayed at the auxiliary
displays for long-term observation of measured quantities.
➭Press the DATA|CLEAR key twice: Current MIN and MAX
values appear at the auxiliary displays.
Automatic range selection is disabled as long as the
MIN/MAX function is active.
➭Press the DATA|CLEAR key once again for a display of the
minimum value and the time of its occurrence.
➭Press the DATA|CLEAR key once again for a display of the
maximum value and the time of its occurrence.
The MIN and MAX values are deleted by pressing and holding
the DATA|CLEAR key (approx. 1 s), by turning the rotary
switch, or by switching the instrument off and back on again.
Note!
No new MIN/MAX values are calculated for a period of
2 to 4 seconds after the measuring range has been
changed (depending upon measuring function), in order
to allow measured values to settle in.
Function
MIN/MAX
⇓
DATA
MIN and MAX
Measured Values /
Time of
Measurement
Response from Instrument
Display Acoustic
Signal
Main Display Aux.
Display
1.
Save 2 x short are
saved Current
measured
value
MIN
and
MAX 1 x
2.
Save and
Display
short are
saved
t and
MIN 1 x
short t and
MAX 1 x
3.
Return to
1short are saved same as 1 sameas 11 x
Stop long are deleted is deleted is
deleted 2 x
CLEAR
long
MIN
MAX
tMIN MIN
tMAX
MAX
Current Measured Value
Current Measured Value
Current Measured Value
Current Measured Value
DATA
short
30.000
V
30.000
10.000 data
V
30.000
MIN MAX
10.000 30.000
V
30.000
MIN
09:20:05 10.000
V
30.000
MAX
09:20:05 30.000
V
DATA
DATA
DATA
DATA
MAN
MAN
MAN
blinks

10 DranTech PMIT User’s Guide
7 Voltage and Frequency Measurement
7.1 Voltage Measurement [V]
➭Select voltage type V or V~/Hz with the rotary selector
switch as appropriate for the measured quantity.
➭Connect the measurement cables as shown.
The “⊥” connector jack should be grounded.
➭The V~/Hz selector switch position: Each time the FUNC
key is pressed, voltage and frequency measurement are
alternately selected, and switching is acknowledged with an
acoustic signal. The respective measured quantity is
displayed at the LCD.
Note!
An intermittent acoustic signal warns the operator if the
measured value exceeds the upper range limit in the
600 V range.
Attention!
!Make sure that a current measuring function (Ω, mΩ,
MΩ) or a C measuring function (°) hasnot been selected
when the multimeter is connected for voltage
measurement!
If fuse blowing limits are exceeded as a result of
operator error, both the operator and the instrument are
in danger!
7.1.1 Zero Balancing in the 3 V DC Measuring Range
➭Select the 3 V measuring range.
➭Plug the measuring cables into the instrument and connect
the free ends to each other.
➭Press the FUNC key.
The instrument acknowledges zero balancing with an acoustic
signal, and “0.0000 V” and the “ZERO” symbol appear at the
display. The voltage value measured at the moment the key is
pressed serves as a reference value (2000 digits). It is
automatically subtracted from all subsequent measured values. If
the measuring range is changed (MAN key), the ZERO function
only remains active (at the display and in memory) for the
selected measuring range.
➭Zero balancing can be deleted:
– By once again pressing and holding the FUNC key, which is
acknowledged with two acoustic signals
(ZERO is deleted in the display)
– By switching the instrument off
7.1.2 Transient Overvoltages
The multimeter is protected against transient overvoltages of up
to 4 kV with rise times of 1.2, and halftimes of 50 μs. For
measurements at transformers or motors with long pulse
durations etc., we recommend the use of our KS30 measuring
adapter. It provides protection against transient overvoltages of
up to 6 kV with rise times of 10, and halftimes of 1000 μs. It has a
continuous load capacity of 1200 V
RMS
. Additional influence
error caused by the KS30 measuring adapter amounts to
approximately –2%.
FUNC FUNC
V
Hz
V~
Hz
226.000
050.00
mΩS+S–
VΩ°C
– (+)
~
+ (–)
~
max. 600 V (3 kHz)
V: 0.1 mV …600 V
Hz: 1 Hz
…3kHz
Measuring Ranges:

DranTech PMIT User’s Guide 11
7.2 Frequency Measurement [Hz]
➭Select the V~/Hz measuring function with the rotary selector
switch.
➭Apply the measured quantity as described under voltage
measurement.
➭Briefly press the FUNC key in order to measure frequency.
The frequency values appears at the main display. The
frequency measuring range can be selected subsequently by
pressing MAN|AUTO. The previously selected voltage
measuring range remains active.
➭The instrument can be switched from frequency
measurement back to alternating voltage measurement by
pressing the FUNC key once again. This selection is
acknowledged with an acoustic signal.
Note!
Frequency measurement is only possible if the measuring
signal passes through zero (AC coupling).
8 Resistance and Diode Measurements
8.1 Resistance Measurement (2-wire connection) [Ω]
➭Make sure that the device under test is voltage-free (see
chapter 7.1). Interference voltages distort measurement
results and damage the instrument!
➭Set the rotary selector switch to “Ω”.
➭Connect the device under test as shown.
Note!
High Impedance Measurements in the 3 MΩ/30 MΩ
Range
In the event of extremely high resistances the capacitive
influence of the person performing the measurement and/
or the measuring cable may distort the measured value.
Use therefore short or shielded measurement cables.
8.1.1 Zero Balancing in the 300 Ωand 3 kΩMeasuring Ranges
Cable and contact resistances can be eliminated for the
measurement of small resistance values in the 300 Ωand 3 kΩ
ranges by means of zero balancing:
➭Plug the measuring cables into the instrument and connect
the free ends to each other.
➭Press the FUNC key.
The instrument acknowledges zero balancing with an acoustic
signal, and “000.00 Ω” or “0.0000 kΩ” and the “ZERO” symbol
appear at the display. The resistance value measured at the
moment the key is pressed serves as a reference value (max. 20 Ω,
or 200 Ω, or 2000 digits). It is automatically subtracted from all
subsequent measured values. If the measuring range is changed
(MAN|AUTO key), the ZERO function remains active (at the
display and in memory).
➭Zero balancing can be deleted:
– By once again pressing and holding the FUNC key, which is
acknowledged with two acoustic signals,
– By switching the instrument off.
0.L
kΩ
FUNC
0.5435
di odE
V
FUNC
000.0
Short
Ω
FUNC
Ω
mΩS+S–
VΩ°C
R
x
Voltage Drop
Ω: 10 mΩ…30 MΩ
Overall measuring range:
+–

12 DranTech PMIT User’s Guide
8.2 Continuity Test during Resistance Measurement
If the “acoustic signal ” function is activated and the 0 ... 310 Ω
measuring range is selected, a continuous acoustic signal is
generated by the instrument within a range of 0 to approx. 10 Ω.
Overflow “0L” is displayed where Rd > 310 Ω.
Activating and Deactivating Continuity Testing (acoustic signal)
➭Set the rotary selector switch to “Ω//”.
➭Repeatedly press the FUNC key until and “Short”appear
at the display, provided the connector jacks are open (Display
0.L).
➭Connect the measurement cables to the device under test.
➭The instrument is switched to resistance measurement by
pressing the FUNC key once again.
8.3 Diode Measurements
➭Make sure that the device under test is voltage-free (see
chapter 7.1). Interference voltages distort measurement
results!
➭Set the rotary selector switch to “Ω//”.
➭Briefly press the FUNC key for diode measurement. Unit of
measure “V” and “diode” are then displayed if the connector
jacks are open (Display 0.L).
➭Connect the device under test as shown.
Conducting Direction and Short-Circuit
The instrument displays conducting-state voltage in volts. As
long as voltage drop does not exceed the maximum display value
of 3 V, several series connected components or reference diodes
can be tested.
Reverse Direction or Interruption
Overload (.0L) is displayed at the instrument for diode
measurements where Ud > 3.1 V. Measuring current is always a
constant current of approximately 1 mA.
Note!
Resistors and semiconductors which are connected in
parallel to the diode distort measurement results!
mΩS+S–
VΩ°C
Conducting Direction
Reverse Direction

DranTech PMIT User’s Guide 13
9 Milliohm Measurement (4-Pole-Measurement)
9.1 Compensation of Cable Resistance
Electrical resistance is a dipole quantity which can generally only
be measured using two poles. This is accomplished by directing a
measuring current of predetermined magnitude through the
device under test, and measuring the resultant voltage drop. The
respective resistance value is derived from the quotient of these
two values.
The two points between which voltage is measured are decisive
as regards the results of the measurement. All resistances between
these two points add to the measured resistance value. These
include contact resistance, as well as cable resistance. If a very
low resistance value needs to be measured, for example contact
resistance at a contactor with a value of only a few milliohms, the
points between which voltage is measured must be moved out of
the measuring instrument and positioned as closely as possible to
the device under test. For this reason, the measuring instrument is
equipped with separate jacks for current feed and voltage
measurement. This type of 4-pole connection is known as
connection according to Kelvin.
KC27 Kelvin probes (available as accessories) allow for easy,
correct connection.
9.1.1 Measurement with Kelvin Probe KC27
9.2 Thermovoltage Compensation
Thermovoltages which occur as a result of material and
temperature differences may distort measurement results. For this
reason, the instrument is equipped with automatic thermovoltage
compensation in the relevant measuring ranges.
Note!
If the measuring current is interrupted during 4-wire-
mΩ-measurement or if the fuse is defective, the message
“leads open” flashes on the display.
If fuse is defective, see chapter 14.2.
VΩ°C
m
Ω
S+S–
red
black
black
Milliohm measurement on con-
ductor bars, welds, coils up to 1
H, etc. with Kelvin probe KC27
Direct the spring-loaded test
probes inward towards the DUT,
if possible, as they are connected
via the red plugs with S
+
or S
–
(Sense) .
01.180
mΩ
FUNC
MAN
00.010
tErMoC
m
FUNC
01.170
m
FUNC
mΩ
Ω
Ω
ZERO
MAN
MAN
Measure
Thermo-
voltage
Thermo-
voltage
Compensated
Measurement
Results
long
30 mΩ
∗
/300 mΩ
∗
at 200 mA
Measuring Ranges:
MAN
FUNC
3Ω/30Ωat 20 mA
mΩS+S–
VΩ°C
R
x
Voltage Drop Measuring Current
mΩ: 0,001 mΩ…30 Ω
Overall Measuring Range:
+–
Measurement Cables,
KC27
Note:
When using KC27
always set red plug at
S
+
or S
–
, respectively.

14 DranTech PMIT User’s Guide
9.3 Milliohm Measurement with 200 mA or 20 mA DC [mΩ]
➭Make sure that the device under test is voltage-free (see
chapter 7.1). Interference voltages distort measurement
results!
➭Set the rotary selector switch to “mΩ”.
➭Connect the device under test as shown.
KC27 Kelvin probes (available as accessories) allow for easy,
correct connection.
Resistance at the current jacks should amount to < 1 Ω.
➭If applicable, select the desired measuring range using the
MAN|AUTO key: 30 mΩ, 300 mΩ, 3 Ωor 30 Ω.
This measuring method is suitable for resistances with
inductances of up to 1 H.
Thermovoltage Correction in the 30/300 mΩRange
➭Press the FUNC key in order to measure thermovoltage. Wait
until the measured value has settled in. This may take several
seconds, depending upon inductivity. Then press the FUNC
key once again in order to return to the milliohm measuring
function. All future measurement result will be corrected
based upon the previously measured thermovoltage value.
ZERO appears at the display in order to indicate active
compensation.
Measurements at Inductive Devices
Coils in motors, choke ballasts and contactors are highly
inductive. Changes in current at inductive devices, including
switching the milliohmmeter on and off or changing the
measuring range, result in a corresponding voltage change. These
changes may be of significant magnitude, and may result in
arcing under unfavorable conditions. The milliohmmeter is
protected against arcing by means of suitable voltage arrestors.
9.4 Milliohm Measurement with 1 A Pulsating Measuring
Current [mΩ@1 A]
(automatic thermovoltage correction in 3 … 300 m Ω range)
➭Make sure that the device under test is voltage-free (see
chapter 7.1). Interference voltages distort measurement
results!
➭Set the rotary selector switch to “mΩ@1A”.
➭Connect the device under test as shown.
KC27 Kelvin probes (available as accessories) allow for easy,
correct connection.
Resistance at the current jacks should amount to < 0.2 Ω.
➭If applicable, select the desired measuring range using the
MAN|AUTO key: 3 mΩ, (30 mΩor 300 mΩ)
Thermovoltage is compensated automatically.
Note!
Due to high current consumption during this
measurement, NiMH rechargeable batteries should be
installed and the NA HIT2x mains power battery charger
should be used.
10 Temperature Measurement [ ° C]
Resistance thermometers (available as accessories) are used for
temperature measurement. A 2-pole measurement is utilized.
Cable resistance is set to 0.1 Ωas a default value.
Selecting Temperature Unit of Measure and Sensor Type
➭Set the rotary selector switch to “°C”. Press FUNC to access
the selection menu for temperature unit of measure and
sensor type. SEnSr and SELCt are displayed.
➭Press the FUNC key to select the desired temperature unit of
measure: °C or °F.
➭Select the sensor type (RTD) with the keys.
➭Connect the sensor to the two jacks (see diagram).
Note!
The selected temperature unit of measure and sensor type
remain unchanged after exiting the function, and when
the instrument is switched off.
0023.2
°C
SEnSr
Pt1000 SELCt
°C

Pt100
FUNC
FUNC
00.10
tEMP
Ω


Cable
Resistance

Pt1000 (TF220)
Ni100
Ni1000
0 …50 Ω

+
Pt1000

FUNC
RTD
°C / °F
rLEAd

DranTech PMIT User’s Guide 15
Adjusting Cable Resistance
➭After selecting a resistance thermometer, the measurement
display is accessed by pressing the key.
➭The menu for cable resistance adjustment is opened by
simultaneously pressing the and keys. RLEAd and tEMP
are displayed.
➭The decade (i.e. the position of the digit to be changed) is
selected with the keys, and the respective digit is set
with the keys.
➭The menu is exited upon acknowledging the last digit by
pressing the key, whereupon the measuring display
returns. The cable resistance value remains in memory. The
default value is 0.1 Ω. Entry is limited to a range of 0 to 50 Ω.
Note!
The selected cable resistance value remains unchanged
after exiting the function, and when the instrument is
switched off.
11 Insulation Resistance Measurement [M Ω @...V]
11.1 Preparing for Measurement
Note!
High-resistance measurements
In the event of extremely high resistances the capacitive
influence of the person performing the measurement and/
or the measuring cable may distort the measured value.
Use therefore short or shielded measurement cables.
The measurement cables may not come into contact with
one another during high-resistance insulation
measurements.
➭Set the rotary selector switch to “MΩ@50V”, “100V”,
“250V” or “500V”, depending upon the desired test voltage.
➭Connect the DUT as shown on the next page.
Note!
Interference voltage
The rotary selector switch may only be set to MΩ@...V
for insulation resistance measurement
(not for voltage measurement).
However, if interference voltage is inadvertently applied
with the switch in this position, it is displayed at the
bottom left. Insulation resistances may only be measured
on voltage-free objects.
If an interference voltage of >50 V is present, insulation
resistance measurement is disabled. The LCD continues to
display the interference voltage value. If a voltage of greater than
610 V is present, an acoustic signal is generated as well.
mΩS+S–
VΩ°C
RTD
see chapter 14
Measuring Range:
-- - - -
V
-000 250 V
MΩ @
50 ... 500V
10 . 29
V
023 250 V
MΩ
Selected Test Voltage
Displays test voltage
as long as key is depressed
R
ISO
FUNC MAN
+
FUNC
Continuous
Measurement
Measuring voltage
/Residual voltage
approx. 2% accuracy
Nominal/
test voltage

16 DranTech PMIT User’s Guide
Note!
Testing the Measurement Cables
Initial testing should be performed by short-circuiting the
measurement cables using their test probes. The
instrument must display nearly 0 Ω. A broken
measurement cable can be detected in this way.
Attention!
!Do not touch the conductive ends of the test probes
when the instrument has been activated for the
measurement of insulation resistance.
You may otherwise be exposed to a current of 1.5 mA
(limited in the measuring instrument), and although this
is not life endangering, the resulting electrical shock is
quite discernible.
If, on the other hand, measurement is being performed
on a capacitive device under test, for example a cable, it
may be charged to approximately ±600 V, depending
upon the selected nominal voltage.
Touching the device under test after measurement has
been performed may be life endangering in this case!
11.2 Insulation Resistance Measurement
➭Press and hold the FUNC key until the display settles in, in
order to measure insulation resistance.
Attention!
!The selected and displayed test voltage blinks during
measurement.
Attention: Contact hazard!
Current voltage at the device under test appears at the
interference or residual voltage display during measurement. This
value is slightly less than nominal voltage.
Insulation resistance measurement is ended by releasing the
FUNC key.
Auto-ranging is active during insulation resistance measurement.
Manual measuring range selection is not possible.
Note!
The instrument’s rechargeable batteries are rapidly
depleted during insulation resistance measurement. Only
hold the multifunction key depressed as long as is
actually necessary. The continuous measurement
described below should only be performed if absolutely
necessary.
Use NiMH rechargeable batteries only.
Continuous Measurement
➭Activation: Briefly press the multifunction key and the
MAN|AUTO key simultaneously. This is acknowledged
with an acoustic signal.
➭Deactivation: Briefly press the multifunction key.
11.3 Ending the Measurement and Discharging
After measurement has been completed, any remaining residual
voltage is displayed which may result from cable capacitance.
These charges are quickly dispersed by means of two internal
resistors with a value of 2 MΩ. However, contact to the device
under test must be maintained. The falling voltage value can be
observed at the interference or residual voltage display.
Do not disconnect the device under test until the voltage value
has dropped to below 25 V!
mΩS+S–
MΩ
R
ISO
U
Measured
(50 to 500V)
Ω: 10 kΩ…3GΩ
Measuring Range:
!

DranTech PMIT User’s Guide 17
12 Using the Menus – from the Initial INF0 Menu to
Operating and Measuring Parameters
Menu-driven operation via the initial “InF0” menu allows the
user to query online help, activate the memory and query memory
occupancy, activate the interface and configure device
parameters.
➭The initial “InF0”menu is accessed by simultaneously
pressing and holding the FUNC and ON|OFF keys with the
instrument switched on, until “InF0”appears at the display.
➭The display can be switched from the main “InF0”menu to
the other main menus including “StorE”, “MEMo”, “SEnd”
and “SEt”, and then back to the “InF0”menu, by repeatedly
pressing the  keys.
➭After accessing the desired main menu, the associated
submenus are opened by activating the key.
➭The desired parameter or the desired function is selected by
repeatedly pressing the  keys.
➭Acknowledge with the key in order to change the
corresponding parameter or parameters.
➭After the desired digit has been selected with the  keys
and the value has been adjusted with the  keys, the next
digit is accessed with the key, or the display is returned to
the start menu or switched to the next submenu.
➭The measuring mode is started by repeatedly pressing the
FUNC key until the measuring display appears.
➭The multimeter is switched off by pressing and holding the
ON|OFF key until the display goes blank.
The following pages include an overview of the menu structure.
12.1 Sampling rAtE
The sampling rate specifies the time interval after which the
respective measured value is transmitted to the interface or to
measured value memory.
Certain sampling rate limit values apply to various measured
quantities, and these may not be exceeded (see table below).
12.2 Saving Measured Values
DranTech PMIT provides two entirely different options for stor-
ing data:
• Measured Value Memory – DATA Key Function:
Each time a measuring point is contacted, a measured value
is stored in accordance with a defined condition (see chapter
5.1 and chapter 12.2.1).
• Memory Mode Operation – STORE Menu Function:
After activating the STORE menu function, all measured
values are saved in accordance with the selected sampling
rate. Memory mode operation is ended manually using the
same menu function.
In both cases, saved measured values can be read out with the
help of DranWin
®
10 PC software (as of version 5.22). However,
read-out is only possible if a USB-HIT adapter has been plugged
into the DranTech PMIT and connected to the PC with an inter-
face cable.
12.2.1
Memory Mode – DATA Key Function (see also chapter 5.1)
The instrument is equipped with a measured value memory
(32 kB) which is synchronized with a quartz movement, and has
an average capacity of 1000 measured values. Minimum capacity
is 800 measured values and maximum capacity is 1200 measured
values.
Data are stored and can be transmitted directly to a PC with the
DranWin
®
10 software. Date and time must be reset if the
rechargeable batteries are depleted or the batteries or
rechargeable batteries are replaced.
Measured values are stored in so-called blocks. Measured values
resulting from the same measuring function are saved to the same
block.
Only absolute values and absolute time stamps can be saved, i.e.
no relative or Δvalues, and no relative time stamps.
Memory content can only be read out with the help of a PC, a
USB-HIT adapter, and DranWin
®
10 analysis software.
Stored measurement data blocks are retained even if the
instrument is without voltage supply.
Preparing for Memory Mode Operation
➭First set the sampling rate for memory mode operation, and
then start memory mode operation.
The sampling rate can also be changed during memory mode
operation.
➭First select the desired measuring function and an appropriate
measuring range.
➭Check the rechargeable battery charge level before starting
long-term measurement recordings (see chapter 14.1 on page
25). Connect the mains power battery charger if applicable.
Measured Quantity Sampling Rate
V0.5s
V∼, 0.5 s
mΩ, Ω
, °C (Pt100, Pt1000) 0.5 s
Hz 1 s
mΩ@1A 1.5 s

18 DranTech PMIT User’s Guide
12.2.2 Memory Mode Operation – STORE Menu Function
➭First set the sampling rate for memory mode operation, and
then start memory mode operation.
The sampling rate can also be changed during memory mode
operation.
➭First select the desired measuring function and an appropriate
measuring range.
➭Check the rechargeable battery charge level before starting
long-term measurement recordings, see chapter 14.1 on page
25. Connect the charger if necessary.
Starting Memory Mode Operation with Menu Functions
➭Open the “Operating Mode” menu (refer to the menu dia-
gram) and select the StorE function.
➭Now activate the key to open the start menu for memory
mode operation: StArt blinks.
Activate the key once again in order to start memory mode
operation: REM appears at the display.
➭Press the key in order to switch to the measuring function.
A new memory block is created when another measuring function
is selected with the rotary switch or the FUNC key. Data storage
then continues automatically. The “SLEEP MODE” is still active,
i.e. the device is switched on and off automatically at sampling
rates of long duration
(see chapter 2).
When memory capacity has been exhausted, MEMO FULL
appears at the display, and an acoustic signal is generated
simultaneously. The signal can be deactivated by pressing any
key.
REM Display
The REM symbol indicates that memory mode operation has
been activated via menu function STORE.
Press the key if you wish to monitor the measured values also
during the memory process.
The “STORE” function cannot be started while the “DATA”
function is activated.
Exiting Memory Mode Operation with Menu Functions
➭Select the StorE menu.
➭Activate the key: StOP blinks.
➭Activate the key once again: the auxiliary displays are
cleared. Memory mode operation has now been deactivated.
➭Press the key in order to return to the measuring function.
➭Memory mode operation can also be exited by switching the
instrument off.
12.3 Querying Memory Occupancy – INFO MEMO/OCCUP
Memory occupancy can be queried from the “InF0”menu. The
main display shows current occupancy as a percentage between
001 and 100%
12.4 Clearing the Memory – MEMO CLEAr
Attention!
!This function deletes all measured values from memory.
This function cannot be performed during memory mode;
bUSY
MEMO
is displayed instead of CLEAR.
12.5 Activating the Default Values
Previously entered changes can be undone, and the default
settings can be reactivated. This may be advisable after the
occurrence of software or hardware errors.
➭Simultaneously press and hold the FUNC, MAN|AUTO and
DATA|CLEAR keys, and switch the instrument on with the
ON|OFFkey.

DranTech PMIT User’s Guide 19
12.6 Transmission Mode Operation with RS 232 Interface
The DranTech PMIT is equipped with a bi-directional infrared
interface for the transmission of measurement data to a PC. Data
are transferred optically through the instrument housing by means
of infrared light to an interface adapter (accessory USB-HIT),
which is attached to the instrument. The adapter’s RS 232
interface allows for the establishment of a connection to the PC
via an interface cable. Beyond this, commands and parameters
can be transmitted from the PC to the instrument as well. The
following functions can be executed:
• Configuration and read-out of measuring parameters
• Measuring function and measuring range selection
• Start measurements
• Read out measured values
Activating the Interface
The interface is switched on manually as described below for
transmission mode operation. The instrument continuously
transmits measurement data to the PC via the interface adapter in
this operating mode. The interface is activated automatically by
the PC for receiving operation (i.e. the instrument receives data
from the PC).
Starting Transmission with Menu Functions
InFO SEnd StArt 
The symbol blinks at the display in order to indicate interface
operation.
Automatic Activation and Deactivation of the Transmission
Mode
If the sampling rate is 20 s or longer, the display is switched off
automatically between samples in order to prolong rechargeable
battery or battery service life.
Exception: continuous operation
As soon as an event occurs, the display is automatically switched
back on.
Configuring Interface Parameters
Addr – Address
If several instruments are connected to the PC via interface
adapters, an unique address must be assigned to each device.
Address 1 should be used for the first device, address 2 for the
second etc. If only one multimeter is utilized, an address between
1 and 14 should be used.
Address 15 is not used for addressing, i.e. the device with address
15 always responds, regardless of the actual address.

20 DranTech PMIT User’s Guide
Main Menus and Submenus
1nF0
MEMO
+
SEnd
SEt
2x
FUNC ON



Clear
YES no



Selection must blink:
YES: delete memory
no: do not delete

Selection
acknowledge
SEnd
0FF/0n StArt/StOP



StArt blinks
 Activate:
Transmission mode active

StOP blinks
 Activate:
no Transmission mode
Current
Status
3.9
bAtt
V
8 01
MEM0 oCCuP
t im e
12 : 58 : 08
d a t e
15 08 .02
SEt
rAtE


See next page for
more submenus


Rechargeable Current Time Current Date
↵
 
Delete Memory Menu (see chapter 12.4)
Transmission Mode (see chapter 12.6)
Configure Device Parameters (see chapter 12.1)
Query Information
!
Memory
Occupancy
(see chapter 12.3)
t C a l
15 08 .02
Calibration Date
t a d J
15 08 .02
Balancing Date
blinks does not blink
“ EMPtY” appears at the display
 
StorE StorE
0FF/0n StArt/StOP


Memory Mode Menu

StArt blinks
 Activate:
Memory mode active

StOP blinks
 Activate:
Memory mode inactive
REM is displayed REM is displayed

Duringmemory
mode the
memory cannot
be deleted,
bUSY
MEMO
is
displayed
instead of
CLEAr.
Charge Level
Battery