Parma VAF-A User manual

ё
РА1.007.001РЭ-001
PARMA Ltd. Saint Petersburg
VOLTAMPEREPHASOMETER
«Parma ВАФ-А»
OPERATING MANUAL
РА1.007.001РЭ
ФГУ

РА1.007.001РЭ-001
27
PARMA Ltd.

РА1.007.001РЭ-001
26
PARMA Ltd.
РА1.007.001РЭ-001
3
PARMA Ltd.
Appearance of “Parma VAF-A” voltamperephasometer
with its accessories

РА1.007.001РЭ-001
4
PARMA Ltd.
ATTENTION!
Study the present document before using the device. In connec-
tion with constant process of improvement the changes in design may
be made, which don’t influence technical characteristics of the device,
but are not described in the present document.
РА1.007.001РЭ-001
25
PARMA Ltd.
8.4 Package is to comply with GOST 22261, group 4 as for exposure to
mechanic environmental factors.
8.5 Overall dimensions in packing are 330x235x105 mm.
8.6 Gross weight is no less than 3 kg.
8.7 The device is suitable for the use in the sphere of state metrological
supervision in case when there are two unopened seals on its housing (on the right
and on the left) belonging to the manufacturer-enterprise and a Gosstandart body
carrying out verification of the device.
8.8 The device sealing has been carried out by a sealing tape identify-
ing the opening.
Do not open the seals!
9 TRANSPORTATION AND STORAGE
9.1 Conditions and order of transportation and storage are to comply
with GOST 22261.

РА1.007.001РЭ-001
24
PARMA Ltd.
7.6.7.9 Turn the clamp so that to place the marking plate in upper
position and repeat the measurements.
7.6.7.10 Turn off all clamps.
7.6.7.11 Make parallel connection of the outer voltage of the system
to the terminals of reference and measurement channels of voltage. Set the
output voltage of UPPU-1M system on 100 V. Measure the phase shift.
7.6.7.12 Change places of the wires of one of the channels and re-
peat the measurements.
7.6.7.13 VAF is considered to pass the tests if the range of voltage-
current, current-current, voltage-voltage phase shift is between –180 and
+180 and the permissible reduced error doesn’t exceed the value determined
in p. 7.1.
7.6.8 Verification of effective range and measurement error of fre-
quency measurement.
7.6.8.1 Set the output voltage of UPPU-1M system on 100 – 400
V. Set the frequency of outer signal on 45 Hz. Measure the frequency. Re-
peat measurements at the following frequencies: 50, 55, 60, 65 Hz.
7.6.8.2 VAF is considered to pass the tests if the range of effective
value of alternating voltage frequency is 45-65 Hz and the relative permissi-
ble error doesn’t exceed the value determined in p. 7.1.
7.7 Presentation of verification results
7.7.1 Verification results are presented as a report.
7.7.2 During initial verification positive result is marked in a device
logbook.
7.7.3 During periodical verification positive result is presented in a
verification-certificate in established order.
7.7.4 The devices are not permitted for use without release verifica-
tion.
7.8 Verification interval
7.8.1 Verification is made one time a year.
8 MARKING, PACKING AND SEALING.
8.1 The following data is marked on a device: name, type, manufac-
turer’s trade mark, national compatibility mark (after type registration), serial num-
ber, year of release, designation of input and output circuits, nominal voltage, type
of current and power supply frequency, class of electric injure protection, warning
marks in according with GOST 26104.
8.2 The following data is marked on a package: name and type of an
article, serial number, manufacturer’s trade mark and name, specifications’ num-
ber.
8.3 Package is to comply with GOST 22261, group 4 as for exposure to
climate environmental factors.
РА1.007.001РЭ-001
5
PARMA Ltd.
CONTENTS
1 Normative References ...................................................................... 6
2 Definitions, Designations and Abbreviations ...................................... 6
3 Safety Requirements ........................................................................ 7
4 Description of the Device and Principles of its Operation.................... 7
4.1 Purpose......................................................................................... 7
4.2 Operation conditions....................................................................... 8
4.3 Electric power supply and consumption requirements...................... 8
4.4 Electric strength and insulation resistance....................................... 9
4.5 Service requirements in overload conditions.................................... 9
4.6 Technical data................................................................................ 9
4.7 Design and operation of the device............................................... 10
5 Preparation for usage ..................................................................... 13
6 Operation Order ............................................................................. 14
6.1 Location of tuning and switching control ........................................ 14
6.2 Measurement order...................................................................... 14
7 Device Verification (Check of Calibration)........................................ 20
7.1 Standardized Methrological Characteristics................................... 20
7.2 Operations of Verification.............................................................. 20
7.3 Safety requirements ..................................................................... 21
7.4 Verification conditions................................................................... 21
7.5 Facilities for verification ................................................................ 22
7.6 Verification conduction.................................................................. 22
7.7 Presentation of verification results................................................. 24
7.8 Verification interval....................................................................... 24
8 Marking, packing and sealing.......................................................... 24
9 Transportation and Storage............................................................. 25

РА1.007.001РЭ-001
6
PARMA Ltd.
The present Operating Manual is intended for study of technical data,
device, operation principle and rules of application of voltamperephasometer
“Parma ВАФ-A”.
1 NORMATIVE REFERENCES
GOST 12.3.019-80. Electric tests and measurements. General safety
requirements.
GOST 14254-80 (IEC 529-76(2-83)) Electric articles. Casings. Protec-
tion levels. Designations. Test methods.
GOST 22261-94 Facilities of measurements of electric and magnetic
values. General Specifications.
GOST 26104-89 (IEC 348-78) Electronic measurement facilities.
Safety specifications, test methods.
GOST 29254-91 Electromagnetic compatibility of technical compo-
nents. Equipment for process measurement and control. Noise immunity
specifications and test methods.
GOST R 51318.22-99 (CISPR 22-97) Electromagnetic compatibility
of technical equipment. Radio disturbance from information technology
equipment. Limits and test methods.
GOST R 51317.4.2-99 (IEC 61000-4-2-95) Electromagnetic compati-
bility of technical equipment. Immunity to electrostatic dis-
charge.Requirements and test methods.
GOST R 51317.4.4-99 (IEC 61000-4-4-95) Electromagnetic compati-
bility of technical equipment. Immunity to electrical fast transient/ burst. Re-
quirements and test methods.
GOST 29073-91 Electromagnetic compatibility of technical equipment
for process measurement and control. Electromagnetic noise immunity.
General provisions.
2 DEFINITIONS, DESIGNATIONS AND ABBREVIA-
TIONS
The present Service Instructions contain the following terms:
Device - Voltamperephasometer “Parma ВАФ-A”.
GOST - Russian State Standards.
Measuring Clamp - current measuring clamp for measurment chan-
nel. Identified by serial numbers to be represented on the display at switch-
ing on of the device, on the side of the corresponding channel. Or by serial
numbers designated in the device logbook.
Reference Clamp - current measuring clamp for reference channel.
Identifying the same way as Measuring Clamp.
Us (Is) - Maximum scale value of voltage (current).
РА1.007.001РЭ-001
23
PARMA Ltd.
7.6.4.4 VAF is considered to pass the test if the range of effective
value of direct voltage is 0.0 – 460 V and the relative permissible error
doesn’t exceed the value determined in p. 7.1.
7.6.5 Verification of effective range and measurement error of
effective value of alternating voltage measurement.
7.6.5.1 Connect the device to UPPU-1M system.
7.6.5.2 Set input voltage frequency on 50 Hz.
7.6.5.3 Switch the device on and make sure that zero value of
voltage is shown on indicator.
7.6.5.4 Make measurements in the following range points: 10, 100,
200, 300, 460 V.
7.6.5.5 VAF is considered to pass the test if the range of effective
value of alternating voltage is 0.0-460 V and the relative permissible error
doesn’t exceed the value determined in p. 7.1.
7.6.6 Verification of effective range and measurement error of
alternating current measurement.
7.6.6.1 Connect the device to UPPU-1M system.
7.6.6.2 Set the frequency of output voltage on 50 Hz.
7.6.6.3 Switch the device on and make sure that zero value of cur-
rent is shown on indicator.
7.6.6.4 Make measurements in the following range points: 100 mA,
1, 3, 5, 7.5, 10.0 A.
7.6.6.5 VAF is considered to pass the test if the range of effective
value of alternating current strength and the relative permissible error doesn’t
exceed the value determined in p. 7.1.
7.6.7 Verification of effective range and measurement error of
phase shift measurement.
7.6.7.1 Connect the device to UPPU-1M system, connect voltage
supplied to terminals of reference channel and join clip-on instrument of
measurement channel to lead wire. Install clamp, marking plate in down
position.
7.6.7.2 Set the frequency of output current and voltage on 50 Hz.
7.6.7.3 Set the output voltage of UPPU-1M system on 100 V, out-
put current on 5 A, current-voltage phase shift equal to zero. Control phase
shift by phase shift meter F2-34.
7.6.7.4 Measure the phase shift.
7.6.7.5 Repeat the measurement for 90 and 180 degree phase
shift.
7.6.7.6 Turn off the voltage.
7.6.7.7 Join clamp of reference channel. Install both clamps on
lead wire of the system in the same manner.
7.6.7.8 Measure the phase shift.

РА1.007.001РЭ-001
22
PARMA Ltd.
7.5 Facilities for verification
7.5.1 Megger F-4101, accuracy class 2.5.
7.5.2 Universal semi-automatic test system UPPU-1M. Voltage
and current tuning range is 750 V; 10 A, error 0,03%.
7.5.3 Voltmeter testing device V1-13. Range is up to 1000 V, er-
ror 32 mV.
7.5.4 Phase shift meter F2-34. Phase shift measurement range
is 0 – 360 deg, error 0.01 deg.
7.5.5 Note: Other types of measurement facilities are permissi-
ble, providing stipulated accuracy of measurement and verified (cali-
brated) in stipulated order.
7.6 Verification conduction
7.6.1 External examination
7.6.1.1 During external examination it is necessary to make sure
that marking conforms to specifications requirements and there are no visible
damages of case, power supply cord and plug, input commutation contacts,
connector assembly and cable. To check joint of jaws of clamps and make
sure that the surfaces are clean.
7.6.2 Determination of insulation resistance
7.6.2.1 Insulation resistance measurement is made with megger at
a fixed voltage of 1000 V.
7.6.2.2 Measurement is made between input contacts, joint to-
gether and contacts of power supply plug, joint together.
7.6.2.3 Insulation resistance is to be no less than 2.6 MW.
7.6.3 Try-out
7.6.3.1 Connect the device to three-phase alternating current sys-
tem, three phase conductors are to be connected with red terminals A, B, C
of the device.
7.6.3.2 Switch on the device. When shifting the connection of con-
ductors on terminals A, B, C make sure that the display shows “Direct phase
alternation” and “Reverse phase alternation”.
7.6.4 Verification of effective range and measurement error of
direct voltage measurement
7.6.4.1 Connect the device to V1-13 system.
7.6.4.2 Switch on the device on and make sure that zero value of
voltage is shown on indicator.
7.6.4.3 Make measurements in the following range points: 10, 100,
200, 300, 460 V.
РА1.007.001РЭ-001
7
PARMA Ltd.
Um (Im) - Measured value of voltage (current).
3 SAFETY REQUIREMENTS
3.1 The device belongs to class II according to GOST 26104 re-
garding electric injury protection.
3.2 Protection level of the device case according to GOST 14254-
80 (IEC 529) is IP54.
3.3 Only persons who had got safety instructions and studied the
present Manual are permitted to work with the device.
3.4 It is prohibited to switch input circuits of the device with voltage
in the researched circuits.
3.5 Switching on the researching circuits one should make all the
operations with one hand.
3.6 Defining the phase alternation order the device automatically
connects A, B, C inputs as a “star”, the resistance between any two “star”
rays being 2 MW. Unused terminals (“cold” in phases A and C) are com-
pletely disconnected.
4 DESCRIPTION OF THE DEVICE AND PRINCIPLES
OF ITS OPERATION
4.1 Purpose
4.1.1 Voltamperephasometer “Parma ВАФ-A”, TU4221-006-
31920409-2004 is a completely automatic universal device.
4.1.2 The device is intended for measurement of direct voltage,
effective value of voltage and current of sinusoidal alternating current with
simultaneous calculation of active and reactive power in a circuit, meas-
urement of frequency, voltage-voltage, current-current (if the device is
completed with two clamp), current-voltage phase shift and determination
of phase alternation order in three-phase systems with midpoint or with-
out it.
4.1.3 The device may be used for complex protection tests of
generators, transformers and lines, in current and voltage transformer cir-
cuits, as well as for adjustment of phase-sensitive relay protection
schemes and so on.
4.1.4 The device is designed in accordance with requirements of
GOST 22261 and current GSI (State System for Ensuring for Uniformity
of Measurments) standards.
4.1.5 The device OKP code is 42 21 99.

РА1.007.001РЭ-001
8
PARMA Ltd.
4.2 Operation conditions
4.2.1 Normal conditions of use of the device according to GOST
22261.
4.2.2 Nominal temperature of ambient air is 20°C. Admissible de-
viation of ambient air temperature is ±5°C.
4.2.3 Service use conditions related to mechanical exposure ac-
cording to group 4, GOST 22261.
4.2.4 Service use conditions related to environmental climate fac-
tors exposure:
− Ambient air temperature from –20 to +55°C;
− Relative air humidity 90% at 30°C;
− Atmospheric pressure between 84 and 106 kPa.
4.2.5 Electromagnetic compatibility conditions Radio noises of the de-
vice correspond to GOST P 51318.22.
The device belongs to equipment class A.
The device has immunity to the following types of noises:
− Electrostatic discharge according to GOST R 51317.4.2;
− Electrical fast transient/ burst according to GOST R 51317.4.4;
− Microsecond pulse disturbance according to GOST 29254;
− Dynamic voltage changes in power network according to GOST
29254.
“B” quality criterion according to GOST 29073 during noise immunity
tests.
Rigidity degree 2 during noise immunity tests.
4.3 Electric power supply and consumption requirements
upply-line voltage, V 220±40
Supply-line frequency, Hz 45-52
Non-linear distortion of supply-line voltage, % no more than 15
Maximum consumed power, no more than W:
From network power source 3
From battery source 0.5.
Direct current power supply voltage is 6 V (4 galvanic cells R14P
(AR)/SIZE C/1.5 V/SUM-2). Battery supply is switching automatically when
network supply cable connector is removed from a jack.
РА1.007.001РЭ-001
21
PARMA Ltd.
Operation is made
during
Names of operations
Point
number
Initial
Verifi-
cation
Periodical
Verifi-
cation
External Examination 7.6.1 + +
Electric insulation resistance test 7.6.2 + -
Try-out 7.6.3 + +
Verification of effective range and
measurement error of direct
voltage measurement.
7.6.4
+
+
Verification of effective range and
measurement error of effective
value of alternating voltage
measurement.
7.6.5
+
+
Verification of effective range and
measurement error of alternating
current measurement.
7.6.6
+
+
Verification of effective range and
measurement error of phase shift
measurement.
7.6.7
+
+
Verification of effective range and
measurement error of frequency
measurement.
7.6.8
+
+
7.3 Safety requirements
7.3.1 Safety requirements when making measurements accord-
ing to GOST 12.3.019.
7.4 Verification conditions
7.4.1 Verification is carried out in normal operation conditions.
7.4.2 Normal device operation conditions according to
GOST22261.
7.4.3 Nominal temperature of ambient air is 20°C. Permissible am-
bient air temperature deviation is ±5°C.

РА1.007.001РЭ-001
20
PARMA Ltd.
7 DEVICE VERIFICATION (CHECK OF CALIBRATION)
7.1 Standardized Methrological Characteristics
7.1.1 Effective Range:
− Effective value of alternating voltage, V 0-460.0
− Direct voltage, V 0-460.0
− Effective value of alternating current, A 0-10.00
− Voltage-voltage, current-current, voltage-current phase shift, deg-
180 - +180
− Frequencies of voltage and alternative current strength, Hz 45-65
7.1.2 Limit of permissible relative measurement error:
− Direct voltage, % ±[1+0.1(Ur/Um-1)]
− Effective value of alternative current, % ±[1+0.1(Ur/Um-1)]
− Effective value of alternative current, % ±[1+0.1(Ir/Im-1)]
− Frequencies of voltage and alternative current, % ±0.1
Limit of permissible reduced error of measurement:
− Voltage-voltage, current-current, voltage-current (with the voltage of
more than 30 V and current of more than 100 mA) phase shift, % ±1
7.2 Operations of Verification
7.2.1 Operations carried out during Initial and Periodical Verifica-
tion are presented in table 1.
Table 1
РА1.007.001РЭ-001
9
PARMA Ltd.
4.4 Electric strength and insulation resistance
4.4.1 Electric strength and insulation resistance conforms to GOST
26104 requirements.
4.4.2 Insulation resistance between short-circuits or equivalent cir-
cuits, insulated from the case of the device, on the one hand, and the other cir-
cuits accessible for external touch and device case, on the other hand, are no
less than 2.6 MW.
4.4.3 Electric insulation between network circuits and equivalent cir-
cuits can withstand test voltage of effective value of 2 kV, frequency of 50 Hz
during 1 minute without damage.
4.4.4 Electric insulation between network circuits and equivalent cir-
cuits and the case of the device can withstand test voltage of effective value of
4 kV, frequency of 50 Hz during 1 minute without damage.
4.5 Service requirements in overload conditions
4.5.1 The device can withstand overload of 2*Us voltage during 1 minute,
where Uk is a final value of a measured voltage range.
4.5.2 The device can withstand overload of 2*Is current during 1 minute,
where Ik is a final value of range of a measured strength of current.
4.6 Technical data
4.6.1 Guaranteed technical data
Range of measurement:
− Effective value of alternating voltage, V 0-460.0
− Direct voltage, V 0-460.0
− Effective value of alternating current, A 0-10.00
− Voltage-voltage, current-current, voltage-current phase shift, deg-
180 - +180
− Active (reactive) power, W (VAr) 0-4600
− Frequencies of voltage and alternative current, Hz 45-65
4.6.2 Limit of permissible relative measurement error:
− Direct voltage, % ±[1+0.1(Us/Um-1)]
− Effective value of alternative voltage, % ±[1+0.1(Us/Um-1)]
− Effective value of alternative current, % ±[1+0.1(Is/Im-1)]
− Frequencies of voltage and alternative current, % ±0.1
4.6.3 Limit of permissible reduced measurement error:
− Voltage-voltage, current-current, voltage-current
− (with the voltage of more than 30 V and current
− of more than 100 mA) phase shift, % ±1
− Active (reactive) power, % ±3
4.6.4 Reference technical data.
The device determines phase alternation order in three-phase sys-
tem.
Limiting value of voltage to be shown on display is no less than, V 600
Input resistance of voltage channels, no less than, MW 1

РА1.007.001РЭ-001
10
PARMA Ltd.
Opening of magnetic circuit of clamps 9±0.5
Mass, no more than, kg 1
Dimensions, no more than, mm 190x70x160
4.7 Design and operation of the device
4.7.1 Design
4.7.1.1 Appearance of the device is shown on fig. 1. The device is
in insulated case made of impact resistant plastic. It is portable and placed in
a soft bag with a belt, used for storage of accessories as well. The case con-
sists of: an upper cover (1) and a base (2), connected with four screws, and
two sides, front (3) and back (4) ones. On the back side there is a cover for
placing of autonomous power-supply battery. On the front panel (3) there is a
power switch (5), display lighting button (6), double terminal (7) for connec-
tion of phase (A) voltage signal or Uref, single terminal (8) for connection of
phase (B) voltage signal, double terminal (9) for connection of phase (C)
voltage signal or Um, jack (10) for connection of a clamp Iref, jack (11) for
connection of a clamp Im, display (12). The jack for connection of the supply
line of 220 V is situated on a side of the base (13).
РА1.007.001РЭ-001
19
PARMA Ltd.
Figure 13
6.2.10 Display lighting
6.2.10.1 Working in conditions of poor illumination momentary press
the button with the sign “” on the front panel. The display lighting will switch on.
Time to switch off will be no less than 10 sec.
DIRECT
PHASE SUCCESSION
180°
270°
0°
90°
Uc
Ua
120°
–120°
Ub
REVERSE
PHASE SUCCESSION
180°
270°
0°
90°
Ub
Ua
120°
–120°
Uc

РА1.007.001РЭ-001
18
PARMA Ltd.
in Umeasuring channel, the device will show both phase shifts. Read indica-
tions on the upper line of display, prefix of voltage-current phase shift: ui=
Figure 11
6.2.9 Determination of phase shift order
6.2.9.1 The device will be switched to required mode automatically,
when the signal comes to terminal B.
6.2.9.2 Correct determination of phase shift order is possible if
only all three phases are connected in accordance with marking on the de-
vice. (see fig. 12, 13)
6.2.9.3 The result of phase shift determination is displayed as a
text, for example:
Figure 12
NO PHASE С
NO PHASE А
φuu= 30° L
220.0V
φui = 30° C 999 mА
180°
270°
0°
90°
Ic
Ua
30°
–30°
Uc
РА1.007.001РЭ-001
11
PARMA Ltd.
Figure 1

РА1.007.001РЭ-001
12
PARMA Ltd.
4.7.2 Design and operation of the device
4.7.2.1 Structure diagram of the device is shown on fig. 2.
Figure 2. Structural diagram of the device
to battery
to network
+5 V
–5 V
1
1
3
14
5
-7 V +7
V
3
1
2
F
CPU
F
7
11
10
1
8
6
4
12
display
9
Ic
Uc
Ub
Ia
Ua
Т
10 с
РА1.007.001РЭ-001
17
PARMA Ltd.
of display will indicate the value of phase shift between Iref current and volt-
age applied to measurement channel (Umeasuring). If there is current in Im
channel either, the device will show both phase shifts.
6.2.6.3 Prefix of current-voltage phase shift: iu=;
Figure 9
6.2.7 Measurement of voltage-voltage phase shift
6.2.7.1 To measure voltage-voltage phase shift, apply voltage to
Ureference and Umeasuring terminals (see fig. 10).
6.2.7.2 Since the moment of signal appearance on Ureference
terminals the device will be switched to the proper mode automatically.
6.2.7.3 The upper line of display will indicate the value of phase
shift between Ureference voltage and voltage applied to measurement chan-
nel (Umeasuring). Read indication from the upper line of the display.
6.2.7.4 Prefix of current-voltage phase shift: uu=;
Figure 10
6.2.8 Measurement of voltage-current phase shift
6.2.8.1 To measure voltage-current phase shift, apply voltage to
terminals, named Ureference, connect measuring clamp to the connector
named Imeasuring (see fig. 11).
6.2.8.2 From the moment of signal appearance on the terminals
Ureference the device will transfer to required mode automatically.
6.2.8.3 The lower line of display will indicate the value of phase
shift between Ureference voltage and Imeasuring current. If there is voltage
φiu= 30° L
220.0V
φii= 30° С 999 mА
180°
270°
0°
90°
Ic
Ia
30°
–30°
Uc
φuu= 30° L
220.0V
φui= ?° 0 mА
180°
270°
0°
90°
Ua
–30°
Uc

РА1.007.001РЭ-001
16
PARMA Ltd.
Figure 7
6.2.5 Measurement of current-current phase shift
6.2.5.1 To measure current-current phase shift (only for the de-
vices completed with two clamps), connect reference clamp (see fig. 8) to
connector marked with Ireference. Join measuring clamp to connector
marked with Imeasuring. Use them for their designated purpose, as they are
not interchangeable. Clamps are marked for correct orientation related to
source (generator) of current. In case of false orientation additional phase
shift will be measured.
6.2.5.2 Embrace the wires with a clamp and make sure that it is
fixed well. Since the moment of signal appearance from clamp of the refer-
ence channel (Ireference) the device will be switched to the proper mode
automatically. The lower line will display the value of phase shift between
Ireference and Imeasuring. Read the indication from the lower line of display,
prefix of current-current phase shift: ii=;
Figure 8
6.2.6 Measurement of current-voltage phase shift
6.2.6.1 To measure current-voltage phase shift, connect reference
clamp to connector marked with Ireference (see fig. 9).
6.2.6.2 Apply voltage to terminals, marked as Uref. Since the mo-
ment of signal appearance from clamp of the reference channel (Ireference)
the device will be switched to the proper mode automatically. The upper line
─190.0W
220.0V
29.2var 999 mА
180°
270°
0°
90°
Uc
Ia
150°
φiu= ?° 0.0V
φii= 30° С 999 mА
180°
270°
0°
90°
Ic
Ia
30°
РА1.007.001РЭ-001
13
PARMA Ltd.
4.7.2.2 The device consists of two galvanically separated parts:
reference and measurement channels.
4.7.2.3 The reference channel is intended for formation of signals
necessary for measurement of phase shifts of galvanically isolated circuits.
These may be current (Im) or voltage (Um). The reference channel consists
of three comparators (1,2,3); two of them to form reference signals Im and
Um (1,2) and one (3) to work with voltage signal Ub in the mode of determi-
nation of phase alternation order. Comparators convert the input sinusoid
signal to meander and pass it through opto-isolators (9) to micro-controller
(10) for further processing. Comparators’ supply is provided by isolated volt-
age converter (4).
4.7.2.4 The measurement channel apart from similar signal forma-
tion facilities for phase shift determination (7,8) contains two voltage-to-
frequency converters (5,6) used for direct measurement of current and volt-
age values.
4.7.2.5 All formed signals come to micro-controller (10), where
programmed evaluation and operation mode choice is made based on de-
termined priorities (see below). The results of measurements are taken out to
display (11).
4.7.2.6 The display has lighting controlled by timer (12) set on 10
sec, which can be started by a button (13).
4.7.2.7 Power supply of measurement channel is provided by the
device (14), forming voltage between +5 V and –5 V.
5 PREPARATION FOR USAGE
5.1 For device power supply use 4 galvanic elements of the type,
mentioned in p. 4.3 with total voltage of 6 V. Use of analogues is permissible.
To install power supply battery unscrew the screws on the back side of the
device and install 4 elements in accordance with marking on the cover of
battery section.
5.2 The device maintains serviceability in case of deep discharge
of the battery without sufficient increase of measurement error. The feature
of necessity to change a battery is a sharp decrease of display contrast
range or its flicker.

РА1.007.001РЭ-001
14
PARMA Ltd.
5.3 Don’t store the device with deeply discharged batteries. This
may cause electrolyte leakage and damage of the device.
6 OPERATION ORDER
6.1 Location of tuning and switching control
6.1.1 The device does not have any switchers of operation mode and
measurement ranges. All switching is made automatically in accordance with esti-
mation of the signals received. To start the device switch the power. In 3 seconds
serial number appear on display:
− in the upper line: device serial number;
− in the lower line to the right: measuring clamp serial number;
− in the lower line to the left: reference clamp serial number (if avail-
able).
Figure 3
6.2 Measurement order
6.2.1 Measurement of effective value of alternating current
strength and its frequency
6.2.1.1 To measure the effective value of alternating current and its
frequency join the measuring clamp to connector, named “I measuring” (see
fig. 4), embrace lead wire by the clamp, make sure that the clamp is fixed
tightly. Read the display indication. The measured effective value of alternat-
ing current strength is situated in the right lower part of display and has the
dimension of current (mA or A), frequency value is in the same line to the left
(Hz).
Figure 4
0.0V
50.01Hz 999 mА
Ser 00001
N00001 N00002
РА1.007.001РЭ-001
15
PARMA Ltd.
6.2.2 Measurement of effective value of alternating voltage and
its frequency
6.2.2.1 To measure the effective value of alternating voltage and
its frequency apply alternating voltage to terminals, named Um (see fig. 5),
read display indication. The measured voltage value is placed in the right
upper part of the display and has a dimension of voltage (V), frequency value
is in the same line to the left (Hz).
Figure 5
6.2.3 Measurement of direct voltage
6.2.3.1 To measure direct voltage, apply it to terminals, named Um
(see fig. 6) in accordance with indicated polarity. If the voltage of opposite
polarity is applied the device will not give any indication (-OV on display):
6.2.3.2 One should check the correctness of direct voltage connec-
tion. To change polarity, if necessary. Type of current is indicated by a sym-
bol before the senior position of voltage value.
Figure 6
6.2.4 Measurement of active and reactive power
6.2.4.1 If both alternating voltage (Umeasuring) and current
(Imeasuring) are applied to the device, phase shift and values of active and
reactive power in researched circuit are determined automatically (see fig. 7).
Indication is made in the left upper part and left lower part of display accord-
ingly.
6.2.4.2 Dimensions and signs of powers are also shown. Phase
shift value is not displayed in this mode. The figure demonstrates device indi-
cation and corresponding real rate of vectors of voltage and current:
─220.0V
0 mА
50.01Hz
220.0 V
0 mА
Table of contents