Applied Precision WS 2120 User manual

Working Standard
Models
WS 2120
WS 2320
User’s Guide
Version 6.19

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User’s Guide
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Content
1. Safety Considerations and Instructions...................................................................................... 4
1.1 Safety Specification ..................................................................................................................5
1.2 Safety Information.....................................................................................................................5
2. Introduction................................................................................................................................... 7
2.1 Description................................................................................................................................7
2.2 Packing.....................................................................................................................................8
3. Device Hardware Overview ..........................................................................................................9
3.1 Front Side.................................................................................................................................9
3.2 Back Side................................................................................................................................ 10
3.3 Bottom Connectors.................................................................................................................11
3.4 Top Connectors ......................................................................................................................12
3.5 Power Supply.......................................................................................................................... 13
3.6 Connector System ..................................................................................................................13
3.6.1 Locking Mechanism......................................................................................................... 14
3.6.2 Cable Connecting............................................................................................................ 15
3.6.3 Cable Disconnecting........................................................................................................ 15
4. Device Software Overview ......................................................................................................... 16
4.1 Initialization.............................................................................................................................16
4.2 Demo Mode............................................................................................................................16
4.3 Main Screen............................................................................................................................ 17
4.4 Text Input................................................................................................................................ 18
4.5 Main Measurement ................................................................................................................. 19
4.5.1 Load Values ....................................................................................................................19
4.5.2 Actual Values ..................................................................................................................22
4.5.3 Graphical Presentation....................................................................................................25
4.6 Energy Measurement and Test...............................................................................................27
4.6.1 Energy Values................................................................................................................. 27
4.6.2 Energy Test..................................................................................................................... 28
4.6.3 Maximum Demand Test...................................................................................................39
4.7 Meter Error Test......................................................................................................................40
4.7.1 Test Result Details ..........................................................................................................42
4.7.2 Optical Sensor Calibration...............................................................................................43
4.8 Constant Detection ................................................................................................................. 44
4.9 Meter Readout........................................................................................................................45
4.10 Transformer Test .................................................................................................................. 45
4.11 Burden Measurement............................................................................................................47
4.12 Menu.....................................................................................................................................48
4.12.1 Measurement Settings................................................................................................... 49
4.12.2 Test Settings .................................................................................................................53
4.12.3 System Settings.............................................................................................................56
4.12.4 Information ....................................................................................................................58
4.12.5 Menu - Tests ................................................................................................................. 59
4.13 Databases............................................................................................................................. 60
4.13.1 Database of Meters....................................................................................................... 61
4.13.2 Database of Meter Errors ..............................................................................................62
4.13.3 Database of Load Values ..............................................................................................64
4.13.4 Database of Energy Tests............................................................................................. 66
4.13.5 Database of Meter Readouts......................................................................................... 68
4.13.6 Adding or Editing Meters ...............................................................................................69
4.13.7 Deleting Database Items ............................................................................................... 71
4.14 Test Report........................................................................................................................... 73

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5. Remote Interface.........................................................................................................................74
5.1 Connection to PC ....................................................................................................................74
5.2 Firmware Upload.....................................................................................................................75
5.3 Remote Communication..........................................................................................................76
5.3.1 Commands Description....................................................................................................76
6. APPENDIX....................................................................................................................................96
6.1 Connection Diagrams..............................................................................................................97
6.1.1 SINGLE PHASE measuring accessories..........................................................................97
6.1.2 TWO PHASE measuring accessories ..............................................................................97
6.1.3 THREE PHASE measuring accessories...........................................................................98
6.2 Aggregate Energy Calculation Methods.................................................................................101
6.3 Overvoltage Categories.........................................................................................................102
6.4 Accuracy Verification.............................................................................................................102
6.4.1 How to carry out the Accuracy Verification?...................................................................102
6.5 Measurement Time................................................................................................................103
6.6 Measurement Error................................................................................................................103
6.6.1 Voltage or Ratio Error in Voltage Transformer................................................................104
6.6.2 Current or Ratio Error in Current Transformer................................................................104
6.7 Maintenance..........................................................................................................................105
6.7.1 Regular Maintenance.....................................................................................................105
6.7.2 Cleaning the Product......................................................................................................105
6.7.3 Battery Replacement......................................................................................................105
6.7.4 User-Replaceable Parts.................................................................................................105
DECLARATION OF CONFORMITY................................................................................................106

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1. Safety Considerations and Instructions
Figure 1 - Working Standard with all its accessories

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1.1 Safety Specification
Input Power
Voltage ................ 115 –230 V ±10%, 50 - 60 Hz,
550 VA max.
Operating............ IEC 61010-1:2010, IEC 61010-2-
030, CAT II, Pollution Degree 2
Temperature
Operating ........ -10 °C to 40 °C
Relative Humidity
Operating......... ≤95 % at Ta ≤25 °C
Altitude
Operating......... 2000 m max.
To ensure safety avoid the use of device in environment, where rain, excessive dust, excessive heat
may occur and other environments that can compromise the safe use of the device.
© 2020 Applied Precision Ltd. All rights reserved.
Product specifications are subject to change without notice. All product names are trademarks of their
respective companies.
Country of Origin: Slovakia
1.2 Safety Information
A Warning identifies conditions and procedures that are dangerous to the user.
A Caution identifies conditions and procedures that can cause damage to the Product or the equipment
under test.
Warnings
To prevent possible electrical shock, fire or personal injury:
•To ensure safety only authorized and properly
trained personnel may use the Product and its
accessories and only for their intended purpose
•Read all safety information before you use the
Product
•Carefully read all instructions.
•Do not use this Product around explosive gas,
vapour, or in damp, wet or dusty environments
•Use only original power adapter
•Examine the case before you use the Product.
Look for cracks or missing plastic. Carefully
look at the insulation around the terminals.
•Do not open the Product, user can only open the
accumulators’ cover in order to exchange them
•Do not use the Product if it operates incorrectly
•Remove the input signals before you clean the
product
•Do not use the Product outside its operational
temperature range
•Do not touch voltages > 30 Vac rms, 42 Vac peak,
or 60 Vdc
•Use only cables with correct voltage ratings
•Inspect the output binding posts prior to use.
Repair broken or loose output binding posts
before use.
•Use the Product only as specified, or the
protection supplied by the Product can be
compromised
•Whenever it is likely that safety protection has
been impaired, the Product must be made
inoperative and secured against any
unintended operation. Inform qualified
maintenance or repair personnel. Safety
protection is likely to be impaired if, for
example, the Product shows visible damage or
fails to operate normally.
•Only authorized service centre may carry our
repair tasks
•Accessory shall be connected to the Product
only when the Product is turned off. Always
use only original accessories.

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OPERATOR who is permitted to gain access, using a Product, to a part which in NORMAL USE may
be HAZARDOUS LIVE, must ensure that the equipment must be isolated or disconnected from the
HAZARDOUS LIVE voltage before access. That means that electricity meter is being connected to
Product when it is turned off.
Lithium primary battery notice
DANGER of explosion if battery is incorrectly replaced.
When replacing the lithium coin-cell battery, use only the same type or equivalent type that is
recommended by the manufacturer. The battery contains lithium and can explode if not properly used,
handled, or disposed of. Do not:
• Throw or immerse into water
• Heat to more than 100°C (212°F)
• Repair or disassemble
Dispose of the battery as required by local ordinances or regulations.
Disposal and recycling information
Batteries and electrical and electronic equipment marked with the symbol of a crossed-out
wheeled bin may not be disposed as unsorted municipal waste. Batteries and waste of
electrical and electronic equipment (WEEE) shall be treated separately using the collection
framework available to customers for the return, recycling, and treatment of batteries and
WEEE. When possible, remove and isolate batteries from WEEE prior to placing WEEE in
the waste collection stream. Batteries are to be collected separately using the framework
available for the return, recycling, and treatment of batteries and accumulators.
Symbols
Symbol
Description
Hazardous voltage. Risk of electric shock.
Risk of Danger. Important information. See Manual.
Earth terminal
Conforms to European Union directives
LIMITED WARRANTY AND LIMITATION OF LIABILITY
This Applied Precision product will be free from defects in material and workmanship for warranty period
from the date of purchase. This warranty does not cover fuses, disposable batteries, or damage from
accident, neglect, misuse, alteration, contamination, or abnormal conditions of operation or handling.
To obtain service during warranty period, contact your reseller or directly the authorized Service Centre
to obtain return authorization information, then send the product to that Service Centre with a
description of the problem.
This warranty is your only remedy. No other warranties, such as fitness for a particular purpose, are
expressed or implied. Applied Precision is not liable for any special, indirect, incidental or
consequential damages or losses, arising from any cause or theory.
Since some states or countries do not allow the exclusion or limitation of an implied warranty or of
incidental or consequential damages, this limitation of liability may not apply to you.
Manufacturer address:
Applied Precision Ltd.
Stavitelska 1
831 04 Bratislava
Slovakia
Technical support contact:
[email protected]m
Service Centre:
Applied Precision Ltd.
Stavitelska 1
831 04 Bratislava
Slovakia

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2. Introduction
2.1 Description
The Working Standard is a precision single-phase (WS 2120) or three-phase (WS 2320) reference
meter for electrical power and energy measurement dedicated for on-site meter testing. The device is
designed for operation in single-, two- and three-phase systems where it evaluates and displays all
individual quantities per phase as well as cumulative quantities.
It is possible to connect any combination of measuring accessoriesto universal interchangeable inputs:
Current Transducer for small currents up to 20 A, Current Clamps for currents up to 120 A or 240 A,
Flexible Current Probe for high currents up to 6000 A and Voltage Transducer for voltages up to 600 V
(phase to neutral).
Measurement based on precision A/D conversion and DSP technology enables accurate high-speed
real time evaluation of all main and informative quantities.
Beyond measurement of power, voltage, current and phase the device indicates voltage sequence and
registers active, reactive and apparent energy. Device measures and graphically displays distortion and
wave-form of measured signals.
Any meter constant can be set to the device which enables to speed up test of the device. In this case
the device behaves as standard electricity meter.
The device is equipped with integrated error calculator and meter scanner capturing LED, DISK or
Closed Contact output of tested meters and snap switch for simple manual testing.
The device can be supplied from internal rechargeable accumulators, external power adapter or
optionally from measured voltage circuit.
Software for MS Windows enables transfer and presentation of measured data in PC.
Optional portable printer enables on-site printing of results or actual display content.

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2.2 Packing
Figure 2 –Device with accessories in a case
1
Transport Case
2
Printed User’s Guide + Calibration Certificate or Flexible Current Probe*
3
Impulse Output BNC Cable
4
Snap Switch
5
Working Standard - body
6
Other accessories:
- Control software (install CD / USB key)
- Portable Printer *
- Cable Set for Current Transducer *
7
Optical Sensor with Fixing Clamp
8
Current Transducer *
9
Current Clamps
10
Voltage Transducer with Crocodile Clips
11
Cable for Optical Sensor
12
Power Adapter
13
Car Outlet Adapter and Impulse and Communication Cables
* Optional accessory
Complete list of accessories can be found in Technical Specification.
1
2
5
7
6
4
3
8
10
12
9
11
13

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3. Device Hardware Overview
3.1 Front Side
Figure 3 –Front side of the device
1
Display
- color graphical display
9
Function keys
- quick access to functions
2
Impulse LED
- red LED of impulse output
10
Indicator of charging of batteries
- green LED indicating charging status
3
Alphanumeric keypad
- keys 0-9 (a-z)
11
Choice keys
- arrows and OK
4
ESC key
- termination of functions
12
PgUp key
- paging upwards
5
Exp key
- input of exponent of number
13
PgDn key
- paging downwards
6
Shift key
- switching of keys functionality
14
Del key
- deleting
7
Power key
- power/LCD backlight turning on/off
15
OK key
- confirmation of choice
8
Sign key
- input of plus/minus sign
16
Point key
- decimal point
1
9
14
2
10
4
5
7
6
8
11
12
13
15
16
3

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Available keypad versions:
Figure 4 –Latin keypad
Figure 5 –Cyrillic keypad
3.2 Back Side
Figure 6 –Back side of the device
1
Protection Rubber
- blue protection rubber
2
Nameplate
- nameplate with product information
3
Accumulators box
- box for accumulators (4 x AA)
4
Screws of accumulators box
5
Screws of back side of the device
3
4
4
5
2
1
5
5
5

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Figure 7 –Name plate
Name plate contains following information:
•Device Brand and Model Number
•Bar Code containing Serial Number
•Serial Number
•Year of Manufacture
•Accuracy Class
•Applicable Standards
•CE mark
3.3 Bottom Connectors
Figure 8 –Bottom side connectors
1
USB Connector
- communication connector USB
2
RS-232 Connector
- communication connector RS-232
3
Power Connector
- connector of power adapter (+12V)
1
2
3

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3.4 Top Connectors
Figure 9 –Top side connectors
1
In A
Signal Input A
- main signal (voltage or current) input connector
2
In B
Signal Input B
- main signal (voltage or current) input connector
3
Aux
Auxiliary (AUX) Input / Output connector
4
-
Auxiliary Lighting LED
- white LED of auxiliary lighting controlled by SHIFT key
Accessories connectable into Auxiliary (AUX) Input / Output connector:
•Optical Sensor
•Impulse Input Base (for connection of Snap Switch or Impulse SO cable)
•Frequency Output with BNC adapter
Accessories connectable into Signal Input A or Signal Input B:
•Voltage Transducer VT 2x60 (max. voltage 600 V)
•Voltage Transducer VT 3x30 (max. voltage 500 V)
•Current Transducer CT 3x20 (max. current 20 A)
•Current Clamps CC 2x12 (max. current 120 A)
•Current Clamps CC 3x24 (max. current 240 A)
•Flexible Current Probe FCP (max. current 6000 A)
Remarks:
Signal Input A and Signal Input B are fully interchangeable and both can be used for connection of any
of above listed accessories. It is also possible to connect sametype of accessories in both signal inputs.
1
2
3
4

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3.5 Power Supply
Caution
Accumulators are necessary to regularly charge, because fully discharging of
them may lead to their damage.
Measurement can be influenced by connected Power Adapter under some
circumstances. It is recommended to test meters with charged accumulators
without connected Power Adapter.
The device is powered from four AA sized 1.2 V rechargeable accumulators.
Device is powered from USB communication interface after connection to PC via USB connector but
batteries are not charged in this case.
External power adapter (12 V) is provided for alternative power supply and batteries recharging. The
Power Supply Connector is located on the bottom side of the device.
Batteries Status Indicator is located in upper right corner of the display and indicates batteries
recharging status or external power supply indication in case of supply from external power adapter.
Batteries Status Indicator (green LED) is situated in front side of the device under key F5.
Batteries Status LED Indicator statuses:
- no light ..................... power adapter not connected
- flashing .................... batteries are charging
- steady light .............. batteries are fully charged
Charging time of discharged batteries is approx. 4.5 hours.
Note:
USB connector connected to the PC does not influence the measurement.
3.6 Connector System
Warnings
To prevent possible damage to the Product, use only accessories and cables
provided by the manufacturer of the Product.
Device uses plastic cylindrical push-pull connectors.
Main advantages of this connector system are:
•quick and easy coupling and decoupling
•definite and secure locking mechanism

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
Figure 10 –Receptacle (socket)
Figure 11 –Plug on the cable of the accessory
Figure 12 –Inserted plug
3.6.1 Locking Mechanism
Figure 13 –Pulling on the cable or on the
back nut causes the locking fingers to grip
tighter into the groove inside receptacle
(socket). A separation is virtually impossible.
Figure 14 –Pulling on the outer plug housing
disengages the locking fingers from the receptacle
groove and the connector separates easily

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3.6.2 Cable Connecting
Figure 15 –Connecting
Figure 16 –Connected cable
3.6.3 Cable Disconnecting
Figure 17 –Incorrect disconnecting
Figure 18 –Incorrect disconnecting
Figure 19 –Incorrect disconnecting
Figure 20 –Correct disconnecting
✓




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4. Device Software Overview
This chapter describes user interface of Working Standard software.
* Screen identification codes (for example * P42) can be found in captions of all described software screens.
4.1 Initialization
Device Initialization screen * P42
Date & Time Adjusting screen * P41
Device Initialization screen is shown after switching on the device using red key .
Device initializes itself and detects all connected accessories during initialization.
Voltage and current sensors have to be connected to the device only when device is switched off –
otherwise the sensors are not recognized by device software. Device loads parameters of sensors only
during device initialization (immediately after switch-on).
In case when devices date & time are incorrect (outside of limit) then Date & Time Adjusting screen is
shown and user has to set correct date & time.
4.2 Demo Mode
Demo Mode in which device is simulating all its functionalities can be used for demonstration purposes
or for learning operation of the device.
Demo Mode can be entered only when device is switched on without any measurement sensor
connected to measurement inputs A and B (both inputs have to be empty). Other connectors do
not have any influence on this.
In that case first shown screen after Device Initialization screen (and possible Date & Time Adjusting
screen) contains red message PRESS OK FOR DEMO MODE in bottom of the screen.

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User has option to enter Demo Mode by pressing OK key or continue operation without entering Demo
Mode by pressing any other key.
Demo Mode Initialization screen which is shown after entering Demo Mode enables to configure Demo
Mode operation.
Demo Mode Initialization screen * P64
Content:
Number of phases ...... 1, 2 or 3
Input A ......................... Voltage, Current or None
Input B ......................... Voltage, Current or None
Control keys:
F1, ESC ...... Exit (don’t run demo mode)
F5 ............... Run demo mode
OK ............ Change selected parameter or run demo
mode when no parameter is selected
▼▲ .......... Selection of parameter
◄ ► ......... Change of parameter value
4.3 Main Screen
Device switch-on and switch-off is done by pressing the red Power key for approx. 3 seconds.
Short pressing of this key toggles backlight of the display.
The device is equipped with color 3.5″ TFT LCD display with screens divided into 3 zones:
1
Header
•page name
•battery indicator
•actual time or keypad mode indicator
2
Info
- measured and calculated values, graphs,
parameters etc.
3
Functions
- graphical presentation of functions
of keys F1 –F5
1
2
3

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4.4 Text Input
Pressing OK button on any selected input field brings device into Text Input Mode in which device
shows Keypad Mode indicator instead of actual time below battery state indicator.
Text Input Mode
Actual Keypad Mode is indicated in upper right corner of the display and can be switched by repeated
pressing of SHIFT key .
Available Keypad Modes:
… Numbers (0-9) - in all device languages
… Latin lower-case letters (a-z) - in all device languages
… Latin upper-case letters (A-Z) - in all device languages
… Cyrillic lower-case letters (а-я) - in Russian language only
… Cyrillic upper-case letters (А-Я) - in Russian language only
Keypad Modes switching order (cyclical):
<SHIFT> <SHIFT> <SHIFT> ...
in all languages except Russian
<SHIFT> <SHIFT> <SHIFT> <SHIFT> <SHIFT> <SHIFT> ...
in Russian language only
Figure 21 –Latin keypad
Figure 22 –Cyrillic keypad
Input characters dependence on pressed key / Keypad Mode / number of quick presses of the key:
Key
1
1
1 ( ) /
1 ( ) /
2
2
a b c 2
A B C 2
а б в г a b c 2
А Б В Г A B C 2
3
3
d e f 3
D E F 3
д е ё ж з d e f 3
Д Е Ё Ж З D E F 3
4
4
g h i 4
G H I 4
и й к л g h i 4
И Й К Л G H I 4
5
5
j k l 5
J K L 5
м н о п j k l 5
М Н О П J K L 5
6
6
m n o 6
M N O 6
р с т у m n o 6
Р С Т У M N O 6
7
7
p q r s 7
P Q R S 7
ф х ц ч pqrs7
Ф Х Ц Ч P Q R S 7
8
8
t u v 8
T U V 8
ш щ ъ ы t u v 8
Ш Щ Ъ Ы T U V 8
9
9
w x y z 9
W X Y Z 9
ь э ю я w x y z 9
Ь Э Ю Я W X Y Z 9
space 0
0
space 0
space 0
+ / -
-
- +
- +
.
.
. , : ;
. , : ;

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4.5 Main Measurement
Content of main measurement page depends on type of connected sensors:
Load Values ......................... if one voltage and one current sensor are connected
Actual Values I ..................... if one current sensor is connected
Actual Values U ................... if one voltage sensor is connected
Actual Values I+I .................. if two current sensors are connected
Actual Values U+U ............... if two voltage sensors are connected
4.5.1 Load Values
Page Load Values shows recently measured and calculated values of load point when one current and
one voltage measurement sensors are used.
WS 2320 - Load Values screen LVa* P01
WS 2320 - Load Values screen LVb* P70
List of displayed quantities:
U, UPN .... Phase to neutral voltage
UPP ......... Phase to phase voltage
I............. Current
P............ Active Power
Q........... Reactive Power
S............ Apparent Power
cos φ, sin φ...... Power Factor (with LAG or
LEAD indication in last column) *
.......... Phase of UPN Voltage
PP ....... Phase of UPP Voltage
Z ............ Burden (Load Impedance)
Z........... Phase shift of burden (Load
Impedance)
............ Phase of Current
............ Distortion Factor of Voltage
............ Distortion Factor of Current
............. Active Power of Harmonics (2nd-Nth)*
IP.............. Active Current
IQ.............. Reactive Current
P1ST .......... Active power of the first harmonic
f ............... Frequency
L1xx ........ Voltage Phase Seq. (L123 or L132)
LI1xx ....... Current Phase Seq. (LI123 or LI132)
*Display of some quantities can be enabled / disabled in Measurement Settings under F5.

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Control keys:
F1 ............. Energy Values
F2 ............. Meter Error Test
F3 .............. Transformer Test
F4 ............. Readout Test
F5 ............. Menu
▼▲.... Scroll Load Values screens: LVa <-> LVa1 <-> LVa2 <-> LVa3 <-> LVa respectively
LVb <-> LVb1 <-> LVb2 <-> LVb3 <-> LVb
To scroll Load Values screens (LVa <-> LVb <-> LVc <-> LVd <-> LVa) use arrows ▼▲ or PgUP
and PgDn keys.
LVc and LVd screens show primary values which depend on CT / VT ratio defined for actual meter.
Other available Load Values screens for WS 2320:
Load Values screen LVc * P68
Load Values screen LVd * P74
Load Values screen LVa1 * P56
Load Values screen LVa2 * P57
Load Values screen LVa3 * P58