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Electronic Load

* Photo is for reference only.
Actual configuration will vary depending on application.

Modular Multifunction Electronic Load

PLZ-U SERIES

Two load models (75 W/150 W) and two frame models (3 ch/5 ch)
High-speed response supporting a maximum slew rate of 2.4 A/μs (PLZ150U)
Minimum setting resolution of 10 μA (PLZ70UA) or 20 μA (PLZ150U)
0-V input operating voltage model (PLZ70UA)
Up to five load modules (same model) can be operated in parallel.
Frame control allows your system to be expanded to a multi-channel system configuration supporting up to 25 channels.
Timer functions combined with time/voltage measurement functions enable battery discharge characteristic evaluations.
The system features sequence and switching functions and is provided with GPIB and RS232C ports as standard.

Multi-Channel Load Systems Can Be Built Easily!
Operating Multiple Units in Parallel Offers Large
Capacity!
For Testing Switching Power Supplies, Batteries,
DC/DC Converters and Fuel Cells!
● Compact, lightweight body● High-speed response● High precision andhigh resolution● Variable slew rate
● 0-V input● Multi-channel system

The PLZ-U Series provides a set of compact, high-performance multi-channel electronic load systems capable ofoperating in three modes - constant current, constant resistance, and constant voltage. Adopting the modular(plug-in) design, the Series consists of four models - two frame models and two load unit models.  The PLZ-30F
frame can configure the load units up to three channels, and the PLZ-50F frame can configure up to five channels.
Two load unit models are available, the PLZ-70UA (75-watt load that operates even at 0 V) and PLZ-150U (150-wattload that operates from 1.5 V up). Load units can be operated in parallel to increase the current capacity or power
capacity. By combining different models of load units and frame, the power capacity can be changed from 75 W to
750 W (when five PLZ150U units are mounted in a PLZ-50F frame).  Supporting the GPIB and RS232C interfaces
as standard, the electronic load can be built into various types of test systems, making it useful in testing fuel cells,
secondary cells, DC/DC converters, switching power supplies, multiple-output power supplies, and more. Bothinterfaces support IEEE 488.2 as well as the Standard Commands for Programmable Instruments (SCPI)
commands, developed for testing and measuring instruments.

E L E C T R O N I C

L O A D

Multifunctional Electronic Load

PLZ-U Series■ PLZ-U Series Component
Product neme

Model nameOperating voltage

Current

Power

Load Unit

PLZ70UA

0 V to 150 V

15 A

75 W

1.5 V to 150 V

30 A

150 W

―

―

―

Load Unit

PLZ150U

Frame (3 ch)

PLZ-30F

Frame (5 ch)

PLZ-50F* Please refer to P15 for the combination list.

2

Remarks

accommodating up to 3ea load modules
accommodating up to 5ea load modules

Electronic LoadFEATURES

PLZ-U Series■ Sequence function to
enable load simulations■ Compact, lightweight body

■ 0-V input

The electronic load system is as wide asa 19-inch rack with a height of 3U.
Weighing about 11 kg when configured
for three channels or about 17 kg when
configured for five channels, the system
is compact, lightweight and space-saving.

T h e PL Z70UA m o de l o p e r ate s eve nwhen the input operating voltage is 0 V.
This feature is indispensable for testing
single-cell fuel cells. The continuing trend
toward lower power consumption andsemiconductor process miniaturization isdriving semiconductor devices to operatewith increasingly lower voltages.  
This makes PLZ70UA suitable for use
when evaluating such power supplies.

In constant current or constant resistancemode, sequence programs, each consisting of up to 255 steps, can be createdwith a minimum step execution time of
1 ms. A separate program can be run
indepen-dently at the same time on achannel-by-channel basis.

■ High-speed response■ Multi-channel system■ External control functions

In constant current mode, the electronicload is capable of offering high-speed
response at a slew rate of 2.4 A/μs at therising and falling edges of the current(equivalent to about 10 μs when converted to the rise and fall times; in the case of
PLZ150U). This allows transient response
tests for direct current power supplies
and simulations using dummy loads to be
conducted under highly realistic loadconditions.

PLZ-50F may be configured with up tof i ve c hanne ls, an d PL Z-30F may b e
configured with up to three channels.
Isolated from each other, the channels
can operate both independently and insynchronization.  Different models of load
units (PLZ150U and PLZ70UA) can behoused in a single frame.

You can activate the input of an externalreference voltage and turn on or off theload for each channel individually.
Through the frame control terminals, you
can perform channel-synchronized ABC
preset memory call, setup memory call,■ High precision and highresolution■ Parallel operation forincreased capacity

The built-in three-range configuration
provides both wide dynamic range andhigh precision. The voltmeter, ammeter
and wat tmeter functions that display
values using up to five digits each anda minimum setting resolution of either
10 μA (PLZ70UA) or 20 μA (PLZ150U)
are implemented.

Up to five load modules may be operated
in parallel, provided that adjacent load
modules are of the same model. For
example, when five load modules areparallel connected in a PLZ-50F frame,
the system can function as a 375-wattload if the paralleled load modules are
PLZ70UAs or as a 750-watt load if theparalleled load modules are PLZ150Us.

■ Variable slew rate

■ Others

In constant current or constant resistancemode, the slew rate can be changed continuously. This helps suppress transient
voltage drops due to wiring inductance,
as well as transients in the constant voltage power supply and others, at the timeof switching operation.

• A setup memory function is provided to save the panel settings.
• The ABC preset memory function lets you preset the three most frequently used values.
• The system comes standard with GPIB and RS232C communication ports.
• The analog-like rotary knobs and intuitive design make the system very easy to operate.
• The system has load input terminals and remote sensing terminals on its front and rear panels.
• The use of heat-sensitive, variable-speed fans and the pursuit of a more efficient coolingstructure have resulted in high reliability and low noise.
• Six protection functions are provided, including over current protection (OCP), under voltage
protection (UVP) and reverse connection protection (RVP).

and load on/off operations.

■ Frame control
You can connect two or more frames anduse one of them to control the others (upto five frames can be connected at atime). This enables you to turn on or off
the load and call preset values.

3

FRONT PANEL EXPLANATION
Load module section

5 6 7

8

9 10

Frame section

16 15 17 18 19

20 21

14

4

22

3
12
11

13

* Photo of PLZ-30F

1

2

Front panel
1 Front-panel load input terminals

9 Unit indicators

16 SET key

These terminals are used to connect this system
to the device to be tested. Identical sets of load
input terminals are provided on the front and rear
panels, and are connected in parallel inside thesystem.

The LED indicates the unit of the measurement
value.

This key is used to select whether the current,
resistance or voltage value to be set.  
In the CC+CV or CR+CV mode, each time youpress the SET key, the current or voltage value isselected alternately.

2 Front-panel remote sensing terminals

11 DISP key

17 Range indicators

Sensing lines are connected to these terminals.  
Identical sets of remote sensing terminals areprovided on the front and rear panels, and areconnected in parallel inside the system.

Pressing this key changes the pair of measurement
values shown in the measurement value display
area.  You can switch among the following pairs ofmeasurement values - voltage/current, voltage/
power, current/power, and elapsed time/alarm or
load-off voltage.

These indicators indicate the ranges of the CC,
CR and CV operation modes.

3 LOAD key
4 Range indicators

12 INDEP key

18 Channel indicator
This indic ator shows the c ur rently selec ted
channel number that is being set.

19 Set value display area

These indicators indicate the ranges of the CC,
CR and CV operation modes.

This key is used to make the load module operate
independently in connection with the load on/off
and ABC preset memory functions.

This area displays the set value, setup memory
number, configuration value, etc.

5 Operation mode indicators

13 LOAD key

20 Unit indicators

These indicators represent the CC, CR and CV
operation modes.

Pressing this key turns on or off the current flowon all the channels simultaneously.  This load on/o f f f u n c t i o n d o e s n o t t a ke e f f e c t f o r t h o s echannels operating in independent mode.

The LED indicates the unit of the set value.

6 ABC preset memory lamps
When data is called from the preset memory A, B
or C, the corresponding LED illuminates.

7 Channel indicator
This indicator shows the channel number of theload module.

8 Measurement value display area
This area displays a pair of measurement valuesof the load module in conjunction with the module
indicators.  Pairs of measurement values that canbe displayed are voltage/current, voltage/power,
current/power, and elapsed time/alarm or load-off
voltage.

4

10 SW/SEQ/EXT/ALM lamps

14 CC, CR and CV/+CV keys
These keys are used to select the operation mode.  
The selectable operation modes are CC, CR andCV/+CV.

15 RANGE/V RANGE keys
These keys are used to select ranges.
RANGE: Used to change the current/resistance
range in each operation mode.   Each time youpress the RANGE key, the current range changes
to the next one in the following order - L, M and H.
V RANGE: In the CV, CC+CV or CR+CV mode,each time you press this key while holding down
the SHIFT key, the range toggles between L and H.

21 SW, SEQ and STORE lamps
These lamps illuminate when the switching modeis on, when the sequence mode is on and whent h e s et u p m e m o r y i s wa i t i n g t o s t o r e d a t a ,respectively.

22 A/B/C key
The three preset values A, B and C can be saved
and called on a channel-by-channel basis.

REAR PANEL EXPLANATION

7

2Electronic Load
PLZ-U Series

8

1
5

6

* Photo of PLZ-30F

4

3Rear panel
1 Rear-panel load input terminals
These terminals are used to connect this systemwith the device to be tested.  They are connectedto the load input terminals on the front panel inparallel inside the system.

4 AC INPUT

5 GPIB

8 CH CONTThis connector is used to perform load on/off andex ter nal volt age referenc e c ontrol f rom theoutside.  It is also equipped with the terminals for
current monitor output and power supply output
for control.

2 Rear-panel remote sensing terminals
Sensing lines are connected to these terminals
when compensating for voltage drops due to load
wire resistance.  Identical sets of remote sensing
terminals are provided on the front and rear
panels, and are connected in parallel inside thesystem.

6 RS232C

3 Air vents

7 FRAME CONT

Cooling fans expel air through these vents to keep
the temperature inside the system constant.  Therotation speed of the cooling fans are controlledaccording to the internal temperature.

This connector is used to perform load on/off,m e m o r y c all an d ot h e r o p e r at i o ns f r o m t h eoutside.

5Performance and Functions
Functions Available Only in
Multi-Channel Systems

High Basic Performance■ Five operation modes■ Diverse load on/off operations

The system is capable of operating in five modes - constantcurrent, constant resistance, constant voltage, constant current+ constant voltage and constant resistance + constant voltage.

Both load units and frames have LOAD keys on them.  
The load on/off operations listed below are available.  
You can choose any of these operations as suitable for youroperating environment.

00Input current I

Input current I

0VI

Input current I

CR + CV(Constant Resistance +Constant Voltage)
Input voltage V

Input current I

V(Constant Current +Constant Voltage)
Input voltage V

0R

CC + CVCV(Constant Voltage)
Input voltage V

Input voltage V

I

CR(Constant Resistance)
Input voltage V

CC(Constant Current)

0

VR

Input current I■ Variable slew rate
The slew rate determines the slope of change in the current
when the set current needs to change sharply as in a transient
response test.  This system lets you set the current change rate
per unit time as appropriate for the selected current range.
Slew rate
CC modeCR modePLZ150U
PLZ70UA
0.10 A/μs to 2.40 A/μs
0.05 A/μ to 1.20 A/μs
0.10 A/μs to 0.24 A/μs
0.05 A/μ to 0.12 A/μs
24 mA/μs*
12 mA/μs*
0.10 A/μs to 0.24 A/μs
0.05 A/μ to 0.12 A/μs
24 mA/μs*
12 mA/μs*
2.4 mA/μs*
1.2 mA/μs*
0.01 A/μs

H
M
L
H
M
L

Resolution* Fixed value■ High precision and high resolution
The built-in three-range configuration provides both wide
dynamic range and high precision.  The voltmeter, ammeter andwattmeter functions that display values using up to five digits
eac h and a minimum set ting resoluti on of either 10 μ A(PLZ70UA) or 20 μA (PLZ150U) are implemented.
Measurement display resolution
Voltmeter
Ammeter

Wattmeter

15.75 V to 150 V
0 V to 15.75 V
H
M
L
Less than 100 W
100 W or more

Resolution
0.01 V
0.001 V
0.001 A
0.0001 A
0.01 mA
0.01 W
0.1 W■ 0-V input
The PLZ70UA model operates even when the input operating
voltage is 0 V.  This feature is indispensable for testing singlecell fuel cells.   The continuing trend toward lower power
consumption and semiconductor process miniaturization isdriving semiconductor devices to operate with increasingly
lower voltages.   This makes PLZ70UA suitable for use whenevaluating such power supplies.
6

Load on/off operations
Selected channel only
Operation using the LOAD key of the load unit
All channels simultaneously Operation using the LOAD key of the frame
Load on delay
Turns on the load when the set time elapses after
the LOAD key is pressed.
Power on load
Turns on the load automatically when the system is
powered on.
Auto load off timer
Turns off the load when the set time elapses after
the load-on operation.
External control
Controls the load on/off operations using externalsignals.
Elapsed time display
Displays the time that elapses from the moment theload is turned on until it is turned off.
Load off voltage display
Stores the value of voltage recorded when the load
is turned off.

■ Channel-synchronized operations
You can have all the channels operated in synchronization forthe load on/of f, ABC preset memor y, setup memor y andsequence operations, respectively.
Channel-synchronized operations
Load on/off
Turns on or off the load for all the channels simultaneously.
ABC preset memory Calls memory data for all the channels simultaneously.
Setup memory
Saves or calls memory data for all the channels
simultaneously.
Sequence
Executes or stops sequence programs for all the channels
simultaneously.

■ Frame control
By connecting two or more frames, you can perform channelsynchronized load on/off, ABC preset memory call and setup
memory call operations for all the channels simultaneously
while controlling up to four frames from a single frame.
1st frame2
Flat cable

2nd frame

1

2

3rd frame1Electronic Load

Performance and Functions

PLZ-U Series

Support for Advanced Tests■ Parallel operation■ Sequence function

Adjacent load modules of the same model installed in the same
frame can be operated in parallel*.   Parallel operated load
modules are regarded as a single channel, and their total
current and resistance (conductance) values are used as
displayed and set values.  Parallel operated load modules andstandalone load modules can coexist in the same frame.
*PLZ-50F can accommodate up to five load modules.

The sequence function automatically executes a stored program
step by step in constant current or constant resistance mode.  
You can set a value and an execution time for each step
individually, which enables you to perform simulations withvarious waveforms.   A separate program can be prepared foreach channel, and the backup function retains these programs
even if the system is powered off.
Program

S

S

M

S

M: Master
S: Slave

Step 1
Step 2
Step 3···

RepeatSet value

M(Step execution time)

Execute (RUN)
10A
5A

Step 256

When PLZ-50F houses one set of three parallel operated load
modules and another set of two parallel operated load modules

1A
1

2

3

4

5

6 7 8

STEP

Sequence setting parameters

Standalone Standalone

M

S

S

M: Master
S: Slave
Standalone:  Standalone load module

When PLZ-50F houses one set of three parallel operated load
modules and two standalone load modules
Number of parallel operated load modules and capacities
Number of parallel operated load modules
23
4
5

PLZ70UA
30 A/150 W
45 A/225 W
60 A/300 W
75 A/375 W

PLZ150U
60 A/300 W
90 A/450 W
120 A/600 W
150 A/750 W

Mode
Step execution time
Maximum number of steps
Number of repetitions

CC or CR
1 ms to 9999 s (0 = End of the step)
255
0 to 9999 (9999 = Repeated infinitely)■ Elapsed time display and auto load off timer
Combining four functions - elapsed time display, under voltage
protection (UVP), load off voltage display and auto load off timer- makes it possible to perform two types of measurements thatare useful in battery discharge tests - measurement of the time
elapsed from the start of discharge until the final voltage is
detected and measurement of the closed circuit voltage after
the specified time elapses from the start of discharge.
VoltageV2: Voltage measured after the
specified time elapses
V1: UVP detection voltage
T2: Auto load off timer
T1: Elapsed time display

V2
V1
T2

0

T1

Time

■ Switching function
Switching operations can be performed in constant current andconstant resistance modes.   The switching setting parameters
are the switching level, switching frequency, duty factor andslew rate.  These parameters can be changed while this mode
is in operation.
Switching setting parameters
Duty factor
Frequency range
Frequency
setting
resolution

2 % to 98 %, in steps of 0.1 %1 Hz to 20 kHz

1 Hz to not higher than 1 kHz
1 Hz
1 kHz to not higher than 10 kHz 10 Hz
10 to 20 kHz
100 Hz7Performance and Functions■ Soft start function■ Configuration setting

The soft start function allows the rise time of the current to bechanged after the load-on operation in constant current mode.  
Since the rise time for the system can be changed according tothe output-voltage rise time for the device being tested, you canconduct tests under highly realistic load conditions.   (The soft
start time can be selected from the following options - 0.1, 1, 3,
5, 10, 30, 100 and 300 ms.)

This function configures the settings related to the system
operation, communication environment, etc.  These settings are
stored in the system memory and called when the power isturned on.

Device being tested
This system• Number of parallel operated load modules• Operation mode in which the external reference voltage input is used
• Over current protection (OCP) load off function• Over power protection (OPP) load off function• Load on delay time0

Set current

Set current• Load on/off operation at the end of the sequence

Time

0

When the soft start function is not used

• Polarity of load on external control (low/high)• Load on/off operation at powering on• Choice between GPIB and RS232CTime
Soft start time

• RS232C communication speed

When the soft start function is used

■ Remote sensing function■ Ease of operation

The remote sensing function compensates for voltage drops inload lines.  It is used to set resistance and voltage values correctly
and to make accurate voltage and power measurements.
Particularly, the function improves the transitional characteristics
in constant voltage and constant resistance modes, leading tostable operation.

All the knobs and keys necessary for the setting operations areprovided on the frame panel.   You can perform the setting
operations by one hand while viewing the measured voltage
and current values displayed on a channel-by-channel basis.  
The analog-like rotary knobs, which employ rotation speedsensitive encoders, and intuitive design make the system very
easy to operate.

■ ABC preset memories
Three memories A, B and C are provided for each range inconstant current, constant resistance and constant voltage
modes, and the set values can be saved.  
The stored set values can be called freely even while the load ison and saved again.  In the constant current + constant voltage
and constant resistance + constant voltage modes, the constantcurrent and constant voltage memories and the constantresistance and constant voltage memories can be called andsaved, respectively.

■ Setup memories
Up to four of the set values listed below can be saved in the
setup memories.  The set values are called or saved for all thechannels simultaneously.
• Operation mode (CC, CR and CV/+CV)• Current, resistance and voltage values recorded when saved• Range setting• Slew rate
• Switching frequency, duty factor and level• Soft start• Configuration settings• ABC preset memory data
• Auto load off timer• Sequence

8• GPIB address setting■ Key lock function
This function locks the panel keys so that the set values, memory
data, sequences and other settings cannot be changed.

■ Numerous protection functions
The system features the following protection functions - overcurrent protection (OCP), over power protection (OPP), overvoltage protection (OVP), under voltage protection (UVP), overheat protection (OHP) and reverse connection protection (RVP).  
Because the OCP, OPP and UVP values can be changed on a
per-channel basis, you can optimize the protection settings foreach device to be tested.

Electronic Load
PLZ-U Series

Meeting System Application Needs■ External controls■ Support for GPIB and RS232C

External controls are provided using the frame connector(FRAME CONT) and each channel connector (CH CONT).  
The frame connector (FRAME CONT) lets you perform thechannel-synchronized load on/off, ABC preset memory call,
setup memor y call, load status output and alarm status
output operations.  
Also, using the channelc o n n e c to r (C H C O N T ),you can per form theexternal voltage reference control, load on/off andinput current monitor
output operations.

The system comes standard with GPIB and RS232C interfaces.
It also complies with the following standards:• IEEE Std 488.2-1992 IEEE Standard Codes,
   Formats, Protocols, and Common Commands
   For Use With IEEE Std 488.1-1987• IEEE Std 488.1-1987 IEEE Standard Digital
   Interface for Programmable Instrumentation• TIA/EIA-232F• Standard Commands fo rProgrammable   Instruments (SCPI) version 1999.0

Pin assignment of connector 1 (valid when ENABLE is at the low level)
No.
1
2
3
4
5
6
7
8
9

Signal name
A
B
C
AUX
MEM0
MEM1
MEM2
MEM3
ENABLE

10
11
12
13
14
15
16
17
18
19
20

LOAD ON
N.C.
N.C.
N.C.
N.C.
LOAD STATUS
ALARM STATUS
+5VIF
N.C.
GND
GND

Input/output

Input *1

Function
Calls preset memory A.
Calls preset memory B.
Calls preset memory C.
Reserved
Call setup memory 0.
Call setup memory 1.
Call setup memory 2.
Call setup memory 3.
Enables load on/off, calling of preset
memories A, B and C, and calling ofsetup memories 0 to 3. *2
Turns on the load.

N.C.

Output *3
N.C.
GND

Set to on when the load is on.
Set to on when an alarm is present.
5-V maximum output current 100 mA
N.C.
GND (chassis potential)*1 Input:  Becomes active when set to the low level and is pulled up to 5 V at 10 kΩ(low-level input voltage = 0 to 1 V; high-level input voltage = 4 to 5 V).  
The signal becomes valid when ENABLE is set to the low level.  When two or moresignals are set to the low level for ABC preset memory call and setup memory call,the last one that is set to low is regarded as valid.
*2 When ENABLE is on, these operations from the panel are disabled.
*3 Output:  Open collector output, output withstand voltage 30 VDC, output saturation
voltage about 1.1 V, maximum output current 100 mA

Pin assignment of CH CONT connector 1
No. Signal name
1 COM
2 I MON
3
4

5

Function
Load input pin [–] (minus) pin potential
Load input current monitor output; 0 to 10 V, 0% to 100%of the rated current
EXT REF
External voltage reference input; 0 to 10 V, 0% to 100%of f.sLOAD ON/OFF Load on input.  Whether to make this signal active at the
CONT
low or high level is determined by the polarity of load on/
off external control, which is among the configuration
settings.  Pulled up to 5 V at 10 kΩ.  Low-level input
voltage = 0 to 1 V; high-level input voltage = 4 to 5 V.
+12V
12-V internal power supply output.  The maximum output
current is 50 mA.

9

■Specifications
RatingModel
Operating voltage (DC)
Current/power

Range

H
M
L

PLZ150U
1.5 V to 150 V
30 A/150 W
3 A/150 W
300 mA/45 W

Isolation voltage of the load input terminal
Withstand voltage between load input terminal channels
Minimum start voltage *1
*1

Range

H
M
L

Selectable range
Resolution

Range

Accuracy of setting
Input voltage variation *2

Range
Range

H
M
L
H, M, and LHMLrms *3p-p *4

RippleSelectable range
Resolution
The value inside parentheses isthe operating range.

Range

H
M
L

Range

H
M
L

Accuracy of setting *3

Range

H, M, and L

Range

H
L

Selectable range
Resolution

Range

H
L
H and L

Accuracy of setting
Input current variation *1

10

PLZ70UA
0 A to 15 A
0 A to 1.5 A
0 A to 150 mA

0 % to 105 % of f.s
2 mA
1 mA
0.2 mA
0.1 mA
0.02 mA
0.01 mA±(0.2 % of set + 0.2 % of f.s) + Vin *1/ 500 kΩ
2 mA
1 mA
0.1 mA
3 mA
7.5 mA
30 mA
50 mA

PLZ150U
PLZ70UA
OPEN to 50 mΩ (0 S to 20 S)
OPEN to 100 mΩ (0 S to 10 S)
OPEN to 500 mΩ (0 S to 2 S)
OPEN to 1 Ω (0 S to 1 S)
OPEN to 5 Ω (0 S to 200 mS)
OPEN to 10 Ω (0 S to 100 mS)
0 % to 105 % of f.s *2
0.2 mS (0 S to 2 S)
0.1 mS (0 S to 1 S)
2 mS (2 S to 20 S)
1 mS (1 S to 10 S)
20 μS (0 S to 200 mS)
10 μS (0 S to 100 mS)
0.2 mS (200 mS to 2 S)
0.1 mS (100 mS to 1 S)
2 μS(0 S to 20 mS)
1 μS(0 S to 10 mS)
20 μS(20 mS to 200 mS)
10 μS(10 mS to 100 mS)±(0.5 % of set *4 + 0.5 % of f.s *5 ) + Vin/500 kΩ

Conductance [S] = (Input current [A]/input voltage [V]) = (1/resistance [Ω])Conductance f.s
Converted value in terms of the input current, during remote sensing
set = input voltage × specified conductance = (input voltage/specified resistance)
f.s = Rated current of the specified range

CV modeModel
Operating range*1

PLZ150U
0 A to 30 A
0 A to 3 A
0 A to 300 mA

Vin: Load input terminal voltage
At a current greater than or equal to (Vin/500 kΩ)Measurement frequency bandwidth: 10 Hz to 1 MHz
Measurement frequency bandwidth: 10 Hz to 20 MHz

CR modeModel
Operating range
The value inside parentheses isthe conductance. *1

*1
*2
*3
*4
*5

500 VDC
500 VDC
0.3 V or greater

Minimum voltage at which the current starts flowing to the PLZ-U is approximately 0.3 V.
(The PLZ-U detects no signal at an input voltage less than or equal to approximately 0.3 V and an input current less than or equal to approximately 1 % of
the range rating. Therefore, if the input voltage is gradually increased from 0 V, no current will flow until 0.3 V is exceeded. If a current greater than or equal
to 1% of the range rating starts flowing, the current can flow at voltages less than equal to 0.3 V.)

CC modeModel
Operating range

*1
*2
*3
*4

PLZ70UA
0 V to 150 V
15 A/75 W
1.5 A/75 W
150 mA/22.5 W

During remote sensing

Range

PLZ150U
1.5 V to 150 V
1.5 V to 15 V

PLZ70UA
0 V to 150 V
0 V to 15 V
0 % to 105 % of f.s
10 mV
1 mV
±(0.1 % of set + 0.1 % of f.s)
12 mV

Electronic Load
PLZ-U Series

Voltmeter
Model
Measurement range
Resolution

PLZ150U

PLZ70UA
0 V to 150.0 V
0.01 V
0.001 V±(0.1 % of rdg + 15 digits)15.75 V to 150 V
0 V to 15.75 V

Measurement accuracy
Ammeter
Model
Measurement range

Range

Resolution

Range

H
M
L
H
M
L

PLZ150U
0 A to 30 A
0 A to 3 A
0 mA to 300 mA
0.001 A
0.0001 A
0.01 mA±(0.2 % of rdg + 0.3 % of f.s)

Measurement accuracy
Wattmeter *1
Model
Measurement range
Resolution*1

PLZ70UA
0 A to 15 A
0 A to 1.5 A
0 mA to 150 mA

PLZ150U
0 W to 150 W

PLZ70UA
0 W to 75 W

100 W minimum
100 W or greater

0.01 W
0.1 W

Product of the measured voltage and measured current

Switching mode
Model
Operation mode
Selectable frequency range
Duty cycle setting
Frequency resolution

PLZ150U

PLZ70UACC and CR
1 Hz to 20 kHz
2 % to 98 %, 0.1 % steps
1 Hz
10 Hz
100 Hz±(0.5 % of set)

1 Hz to less than 1 kHz
1 kHz to less than 10 kHz
10 kHz to 20 kHz

Accuracy of frequency setting
Slew rate
Model
Operation mode
Selectable range (CC)Range

Selectable range (CR)Range

PLZ150U
H
M
L
H
M
L

0.10 A/μs to 2.40 A/μs
0.10 A/μs to 0.24 A/μs
24 mA/μs *1
0.10 A/μs to 0.24 A/μs
24 mA/μs *1
2.4 mA/μs *1

Resolution
Accuracy of setting *2*1*2

PLZ70UACC and CR
0.05 A/μ to 1.20 A/μs
0.05 A/μ to 0.12 A/μs
12 mA/μs *1
0.05 A/μ to 0.12 A/μs
12 mA/μs *1
1.2 mA/μs *1
0.01 A/μs±(10 % of set + 5 μs)

Fixed value
Time to reach from 10 % to 90 % when the current is changed from 2 % to 100 % of the rated current of H range.

Soft start
Model
Operation mode
Selectable time range
Time accuracy
Sequence function
Model
Sequence

PLZ150U

PLZ70UACC
0.1, 1, 3, 10, 30, 100, or 300 ms±(30 % of set +100 μs)

PLZ150U
Operation mode
Maximum number of steps
Step execution time
Number of loops

PLZ70UACC and CR
255
1 ms to 9999 s
1 to 9999 (9999 is infinite loop)11■Specifications
Protection function
Model
Overvoltage protection (OVP)
Overcurrent protection (OCP)

Overpower protection (OPP)
Overheat protection (OHP)
Reverse connection protection (RVP)
Undervoltage protection (UVP)

Communication function
Model
GPIB

RS232CInter-frame control and external control
Model
Inter-frame control

Recall input of preset mem-ories A, B, and C
Setup memory recall input
External
control

Enable input
Load-on input
Load on status output
Alarm status output
Internal power output

Input signal
Output signal

Remote sensing
Model
Sensing voltage that can be compensatedMiscellaneousModel
ABC preset memories
Setup memories
Elapsed time display
Auto load off timer
Delayed load-on
Parallel operation

12

PLZ150U
PLZ70UA
Turns off the load at 110 % of the rated voltage
Set the value in the range of 0 % to 110 % of the rated current of H range.
Trips at the value or 110% of the rated current of the range, whichever is less.
The action taken when the OCP trips can be set to load off or limit.
Set the value in the range of 0 % to 110 % of the rated power of H range.
Trips at the value or 110% of the rated power of the range, whichever is less.
The action taken when the OPP trips can be set to load off or limit.
Trips when the heat sink temperature reaches 95 °C.
The action taken when the OHP trips is to turn the load off.
Short-term protection provided by a short-circuit system using a protection diode.
The action taken when the OHP trips is to turn the load off.
Set the value to off or in the range of 0 % to 100 % of the rated voltage.
The action taken when the OHP trips is to turn the load off.

PLZ150U
PLZ70UAIEEE std. 488.2-1994
SH1, AH1, T6, L4, SR1, RL1, PP0, DC1, DT1, C0, and E1
Supports the SCPI command set
Sets panel functions except the POWER switch and key lock and reads measured values
D-SUB 9-pin connector (conforms to EIA-232-D)
Sets panel functions except the POWER switch and key lock and reads measured values
Baud rate: 2400, 4800, 9600, or 19200 bps; stop bit: 1; data length: 8 bits; parity: NONE; andflow control: XON/OFF.

PLZ150U
PLZ70UAControls up to four slave frames from the master frame.
Enables you to turn on/off the load, recall presets ABC on all channels simultaneously,
and recall setup memories 0 to 3.
Recalls preset memories A, B, and C on all channels simultaneously
Recalls the setup memory 0 to 3
Enables the turning on/off of the load, recalling of presets ABC on all channels simultaneously,
and recalling of setup memories 0 to 3.
Turns on the load on all channels simultaneously.
On when the load is on (open collector output)
On when the alarm is on (open collector output)
5 V and maximum output current of 100 mA
Low active, pull up to 5 V using 10 kΩ.
Low level input voltage: 0 V to 1 V, high level input voltage: 4 V to 5 VOpen drain, output withstand voltage of 30 VDC,
output satura-tion voltage of approximately 0.7 V, and maximum output current of 100 mA.

PLZ150U
2 V for a single line

PLZ70UA

PLZ150U
PLZ70UA
Saves settings (A, B, and C) for each operation mode of each range
Saves four sets of setup parameters
Measures the time from when the load is turned on to when the load is turned off(0.1 s to 99999 s)
Turns off the load after the specified time elapses (off or 1 s to 99999 s)
Turns on the load after the specified time elapses (0 ms to 1 s, 10 ms steps)
Possible between adjacent load units (same model) in the frame.

Electronic Load
PLZ-U Series

External analog control
Model
Power output
External voltage control input *1
Load-on input.
Current monitor output
Common*1

PLZ150U
PLZ70UA
12 V and maximum output current of 50 mA.
Operates in CC, CR, and CV modes.
0 % to 100 % of f.s in the range of 0 V to 10 V.
Low active (or high active), pull up to 5 V using 10 kΩ.
Low level input voltage: 0 V to 1 V, high level input voltage: 4 V to 5 V
0 % to 100 % of the rated current in the range of 0 V to 10 V
Negative pin electric potential of the load input terminal

The time for updating the setting in CR or CV mode is approximately 100 ms.

General Specifications
Model
WeightRear load input terminal coverSet of screws for the load input connector
Accessories
Load unit attachment screws
Sensing terminal screw on the rear panel
Model
Rated supply voltage
Rated frequency
Frame alone
Powerconsumption
When load units are installed in all channels
Cooling system
Operating environment
Operating temperature range
Operating humidity range
Storage temperature range
Storage humidity range
AltitudeInsulation
Primary - chassis
resistanceWithstandPrimary - chassis
voltageGround continuity
Battery backup
Number of installable load modules
Dimensions (mm)WeightFrame alone
Power cord
Blank panel (front panel)
Accessories
Protection dummy plug
Operation manual

Electromagnetic compatibility *2, *3

Safety *2

PLZ150U

PLZ70UAApprox. 2 kg (4.41 lb)
1 pc.
2 sets (M6 bolt, M6 nut, M6 spring washer, M4 screw)
2 pcs. (M3-10 screws, attached to the unit)
2 pcs. (M3-6 screws, attached to the unit)

PLZ30F
PLZ50F
100 VAC to 240 VAC (90 VAC to 250 V) single phase
50 Hz or 60 Hz (47 Hz to 63 Hz)
33 VA or less
40 VA or less
300 VAmax
500 VAmax
Forced air cooling using a heat sensing variable speed fan.
Indoor use, Overvoltage Category II
0 °C to 40 °C (32 °F to 104 °F)
20 % to 85 % RH (without condensation)–20 °C to 70 °C (-4 °F to 158 °F)
90 % RH or less (without condensation)
Up to 2000 m
500 VDC, 30 MΩ or more (ambient humidity of 70% RH or less)
No abnormalities at 1500 VAC for 1 minute.
25 AAC, 0.1 Ω or less
Backs up the setup data immediately before the power is turned off
Battery life: 3 years or longer (at 25 °C)
35
See outline drawing.
Approx. 5 kg (11.02 lb)
Approx. 7 kg (15.43 lb)
1 pc. (with SVT3, 18AWG, 3-prong plug, cable length of 2.4 m)
2 pcs. maximum *1
4 pcs. maximum *1
2 pcs. (for the FRAME CONT connector, attached to the unit)
1 pc.
Conforms to the requirements of the following directives and standards
EMC Directive 2014/30/EU
EN 61326-1 (Class A *4)
EN55011 (Class A *4, Group 1 *5)
EN 61000-3-2
EN 61000-3-3
Conforms to the requirements of the following directives and standards
Low Voltage Directive 2014/35/EU *3
EN 61010-1 (Class I *6, Pollution degree 2 *7)*1. In products that have load units installed, blank panels are installed in the empty slots. In products that contain the frame alone, the maximum number ofblank panels are installed.
*2. Does not apply to specially ordered or modified PLZ-U*3. Limited to products that have the CE mark/UKCA mark on their panels.
*4. This is a Class A equipment. This product is intended for use in an industrial environment. This product may cause interference if used in residential areas.
Such use must be avoided unless the user takes special measures to reduce electromagnetic emissions to prevent interference to the reception of radio andtelevision broadcasts.
*5. This is a Group 1 equipment. This product does not generate and/or use intentionally radio-frequency energy, in the from of electromagnetic radiation,inductive and/or capacitive coupling, for the treatment of material or inspection/analysis purpose.
*6. This is a Class I equipment. Be sure to ground the this product's protective conductor terminal. The safety of this product is only guaranteed when the productis properly grounded.
*7. Pollution is addition of foreign matter (solid, liquid or gaseous) that may produce a reduction of dielectric strength or surface resistivity. Pollution degree 2
assumes that only non-conductive pollution will occur except for an occasional temporary conductivity caused by condensation.

13

■External Dimensions and Rack Mounting
MAX315(12.40)
292(11.50)

MAX10(0.39)

MAX460(18.11)435(17.13)

MAX10(0.39)

MAX 470(18.50)

MAX 20(0.79)

400(15.75)

128 (5.04)

MAX145(5.71)

128 (5.04)
MAX145(5.71)

Unit: mm (inch)

100

132 (5.20)

Unit: mm24.5

Unit: mm (inch)

460
480

37.5
(4.48)

57(2.24)

465(1
482 8.31)
(18.9
8)

149

KRB150-PLZ-30F

KRB3-PLZ-30F

KRB150-PLZ-50F

24.5

Unit: mm (inch)

100
149

465
484.4

37.5
(1.48)

57(2.24)

465
484.4(18.31)
(19.0
7)

132 (5.20)

KRB3-PLZ-50F

Unit: mm2.075

PLZ150UW(1.5 V input type)Operating area where
specifications are guaranteed

H range

1

0.1
0.1

1
10
Input current [A]

1.5

15

0

10
5

Input voltage [V]H range

10
5

150
100

Input voltage [V](0 V input type)

Input voltage [V]PLZ70UA

150
100

W

Operating area where
specifications are guaranteed

1.5
1Actual operating area
1

0.5

Actual operating area
0.1
0.1

15

Operating area where
specifications are guaranteed

Low voltage area

3
1
10
Input current [A]

0

30

0

10
20
30
Input current [A]M range

10
5W

PLZ150U(1.5 V input type)Operating area where
specifications are guaranteed

M range

1

0.1
0.01

0.1
1
Input current [A]

150
100
50
10
5

15

0W

1.5

Input voltage [V](0 V input type)

150
100
50

Input voltage [V]PLZ70UA

Input voltage [V]

2.0

75

Operating area where
specifications are guaranteed

1.5
1Actual operating area
1.0

0.5

Actual operating area
0.1
0.01

1.5

Low voltage area0

0.1 0.3
1
Input current [A]

3

0

0.1
0.2
0.3
Input current [A]10
5

PLZ150U

Operating area where
specifications are guaranteed

L range

1

0.1
0.001

14

(1.5 V input type)

0.01
0.1
Input current [A]

0.15

150
100
50
10
5

1.5
Operating area where
specifications are guaranteed

1.5
1Input voltage [V]L range

Input voltage [V]PLZ70UA(0 V input type)

Input voltage [V]

2
150
100

Actual operating area
1

0.5

Actual operating area
0.1
0.001

Operating area where
specifications are guaranteed

Low voltage area0

0.01
0.1 0.3
Input current [A]

0

0.1
0.2
0.3
Input current [A]Electronic Load
PLZ-U Series■Ordering Code
PLZ-U Series Component
Product neme

Model name

Remarks

Load Unit

PLZ70UA

75 W/15 A, 0 V-150 V

Load Unit

PLZ150U

150 W/30 A, 1.5 V-150 V

Frame (3 ch)

PLZ-30F

accommodating up to 3ea load modules

Frame (5 ch)

PLZ-50F

accommodating up to 5ea load modules

Ordering code

* Please inquire by following code

Model name

Frame model

PLZ70UA

PLZ150U

Total number of unit

PLZ30F-70UA0-150U1

0

1

1

PLZ30F-70UA0-150U2

0

2

2

PLZ30F-70UA0-150U3

0

3

3

PLZ30F-70UA1-150U0

1

0

1

PLZ30F-70UA1-150U1

PLZ-30F

1

1

2

PLZ30F-70UA1-150U2

1

2

3

PLZ30F-70UA2-150U0

2

0

2

PLZ30F-70UA2-150U1

2

1

3

PLZ30F-70UA3-150U0

3

0

3

PLZ50F-70UA0-150U1

0

1

1

PLZ50F-70UA0-150U2

0

2

2

PLZ50F-70UA0-150U3

0

3

3

PLZ50F-70UA0-150U4

0

4

4

PLZ50F-70UA0-150U5

0

5

5

PLZ50F-70UA1-150U0

1

0

1

PLZ50F-70UA1-150U1

1

1

2

PLZ50F-70UA1-150U2

1

2

3

PLZ50F-70UA1-150U3

1

3

4

1

4

5

PLZ50F-70UA1-150U4
PLZ50F-70UA2-150U0

PLZ-50F

PLZ50F-70UA2-150U1

2

0

2

2

1

3

PLZ50F-70UA2-150U2

2

2

4

PLZ50F-70UA2-150U3

2

3

5

PLZ50F-70UA3-150U0

3

0

3

PLZ50F-70UA3-150U1

3

1

4

PLZ50F-70UA3-150U2

3

2

5

PLZ50F-70UA4-150U0

4

0

4

PLZ50F-70UA4-150U1

4

1

5

PLZ50F-70UA5-150U0

5

0

5

Options
Product neme

Rack mount bracket

Control Flat Cabel

Model name

Remarks

KRB3-PLZ-50F

Applicable Model: PLZ-50F, Inch rack EIA standard

KRB150-PLZ-50F

Applicable Model: PLZ-50F, Milli rack JIS standard

KRB3-PLZ-30F

Applicable Model: PLZ-30F, Inch rack EIA standard

KRB150-PLZ-30F

Applicable Model: PLZ-30F, Milli rack JIS standard

PC01-PLZ-4W

Length: 300 mm, Connection between frames

PC02-PLZ-4W

Length: 550 mm, Connection between frames15

Option“Wavy” sequence creation software

Wavy series■ Sequence creation software
Wavy for PLZ-U[Operating environment] Windows 7 / Windows 8*For details, please refer to our web site.

The software extends the feature of waveform generation and sequence functions.
Using a mouse, you can create and edit feel like drawing and filling out the spreadsheet.
■ It makes you easier to create or edit the test condition file required for the sequence operation.
■ By using the storage function of test condition data file,
it enables you to manage the test condition of the standard routine test.
■ The progress of execution sequence will be displayed on the "execution graph" with the setting value and the cursor.
■ It is possible to observe the intuitionistic output through by the "monitor graph" that plots the ongoing monitor value.
■ You can save the acquired monitor data as a test result.
■ Supports the status of description of sequence step for "selected" or "not selected".
It enables you to select depends on the requirement such as the "pausing function", "trigger function", or "AC waveform".

Download !
Trial version is available on our web !!

▲Screen sample

https://global.kikusui.co.jp/downloads/■Distributor:

1-1-3, Higashiyamata, Tsuzuki-ku, Yokohama, Kanagawa, 224-0023, Japan
Phone:(+81)45-593-0200, Facsimile:(+81)45-593-7591, https://global.kikusui.co.jp/

KIKUSUI AMERICA, INC.
3625 Del Amo Blvd., Suite 160 Torrance, CA90503
Phone: 310-214-0000, Facsimile: 310-214-0014

KIKUSUI TRADING (SHANGHAI) Co., Ltd.
Room 305, Shenggao Building, No.137, Xianxia Road, Shanghai City, China
Phone: 021-5887-9067, Facsimile: 021-5887-9069

KIKUSUI ELECTRONICS EUROPE GmbH
Grossenbaumer Weg 8, 40472 Duesseldorf, Germany
Phone: +49(211)54257600, E-mail: support@kikusui-europe.com
For our local sales distributors and representatives, please refer to "sales network" of our website.

Printed in Japan■ All products contained in this catalogue are equipment and devices that are premised on use under thesupervision of qualified personnel, and are not designed or produced for home-use or use by general consumers.
■ Specifications, design and so forth are subject to change without prior notice to improve the quality. ■ Productnames and prices are subject to change and production may be discontinued when necessary. ■ Product names,
company names and brand names contained in this catalogue represent the respective registered trade name ortrade mark. ■ Colors, textures and so forth of photographs shown in this catalogue may differ from actual products
due to a limited fidelity in printing. ■ Although every effort has been made to provide the information as accurate as
possible for this catalogue, certain details have unavoidably been omitted due to limitations in space. ■ If you findany misprints or errors in this catalogue, it would be appreciated if you would inform us. ■ Please contact our
distributors to confirm specifications, price, accessories or anything that may be unclear when placing an order orconcluding a purchasing agreement.

Issue:Jul.2024

202407PDFEC111