Global Specialties 1368 User manual

User Manual
1368
1369
1370
Triple Output Programmable Power Supplies

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Table of Contents
Safety .................................................................................................................... 3
Compliance and Certications............................................................................... 7
Introduction............................................................................................................ 8
Product Overview .................................................................................................. 9
Front Panel............................................................................................................ 9
Rear Panel........................................................................................................... 10
Display................................................................................................................. 11
Operation............................................................................................................. 12
Setting the Voltage and Current .......................................................................... 12
CH SET ............................................................................................................... 13
CH File................................................................................................................. 14
Menu Set ............................................................................................................. 14
Specications ...................................................................................................... 16
Interface and Communication.............................................................................. 17
RS-232 Interface ................................................................................................. 17
USB TMC ........................................................................................................... 19
USB CDC Virtual Serial Port ............................................................................... 21
Command Structure ............................................................................................ 21
SCPI Command................................................................................................... 22
Limited One-Year Warranty ................................................................................. 27
Service................................................................................................................. 28
© 2019 Global Specialties. All rights reserved.
Unauthorized duplication of Global Specialties documentation materials is strictly
prohibited. Customers are permitted to duplicate and distribute Global Specialties
documentation for internal educational purposes only.

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Safety
To avoid personal injury and/or product damage, review and comply with the following
safety precautions. These precautions apply to both operating and maintenance
personnel and must be followed during all phases of operation, service, and repair of
this meter. Before applying power be sure to:
• Read and understand the safety and operational information in this manual.
• Apply all the listed safety precautions.
• Verify that the voltage selector on the bottom of the power supply is set to the
correct line voltage. Operating the instrument at an incorrect line voltage will
void the warranty.
• Make all connections to the instrument before applying power.
• Do not operate the instrument in ways not specified by this manual or by
Global Specialties.
Failure to comply with these precautions or with warnings elsewhere in this manual
violates the safety standards of design, manufacture, and intended use of the
instrument. Global Specialties assumes no liability for a customer’s failure to comply
with these requirements.
Dry Conditions
Hands, shoes, oor, and work bench must be dry. Avoid making measurements with
dampness, or other environmental conditions that might affect safety.
Cleaning
Use a soft cotton cloth lightly moistened with a mild solution of detergent and
water. Do not allow any portion to be submerged at any time. Dry thoroughly before
attempting to make measurements. Do not use solvents or expose to solvent fumes
as they may cause deterioration or damage.
Do not Operate:
• In the presence of noxious, corrosive, flammable fumes, gases, vapors,
chemicals, or finely-divided particulates.
• In environments where there is a danger of any liquid being spilled on the
meter.
• In air temperatures exceeding the specified operating temperatures.
• In atmospheric pressures outside the specified altitude limits or where the
surrounding gas is not air.
Only for use in pollution degree 2 environments where non-conductive pollution
occurs except occasionally when a temporary conductivity caused by condensation is
expected.

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Denitions
MEASUREMENT CATEGORY - Classication of testing and measuring circuits
according to the types of mains circuits to which they are intended to be connected.
• MEASUREMENT CATEGORY I (CAT I): Measurement instruments whose
measurement inputs are not intended to be connected to the mains supply.
The voltages in the environment are typically derived from a limited-energy
transformer or a battery.
• MEASUREMENT CATEGORY II (CAT II) - measuring circuits connected
directly to utilization points of the low-voltage mains installation.
• MEASUREMENT CATEGORY III (CAT III) - measuring circuits connected to
the distribution part of the building’s low-voltage mains installation.
• MEASUREMENT CATEGORY IV (CAT IV) - measuring circuits connected at
the source of the building’s low-voltage mains installation
Do not use this instrument in an electrical environment with a higher category rating
than what is specied in this manual for this instrument. You must ensure that each
accessory you use with this instrument has a category rating equal to or higher than
the instrument’s category rating to maintain the instrument’s category rating. Failure
to do so will lower the category rating of the measuring system. Working CAT rating
is equal to that of the lowest rated element within the test set-up.
Electrical Power
This instrument is intended to be powered from a CATEGORY II mains power
environment. The mains power should be 110 V RMS or 220 V RMS. Use only the
power cord supplied with the instrument and ensure it is appropriate for your country
of use. Use only type T10AL 250 V fuses. To switch between 110/220 V settings,
slide the switch on the bottom of the unit.
Ground the Instrument:
To minimize shock hazard, the instrument case must be connected to an electrical
safety ground. This instrument is grounded through the ground conductor of the
supplied, three-conductor AC power cable. Do not alter or defeat the ground
connection. Without the safety ground connection, all accessible conductive parts
(including control knobs) may provide an electric shock. Failure to use a properly-
grounded approved outlet and the recommended three-conductor AC line power
cable may result in injury or death. Unless otherwise stated, a ground connection on
the instrument’s front or rear panel is for a reference of potential only and is not to be
used as a safety ground.

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Indoor Use:
This instrument is intended to be used in an indoor pollution degree 2 environment.
The operating temperature range is 0 °C to 40 °C and the operating humidity range is
up to 80% relative humidity with no condensation allowed. Measurement results may
be outside specications if the instrument is used in non-ofce-type environments.
Such environments may include rapid temperature or humidity changes, sunlight,
vibration and/or mechanical shocks, acoustic noise, electrical noise, strong electric
elds, or strong magnetic elds.
Do not Operate:
If the instrument is damaged, appears to be damaged, or if any liquid, chemical, or
other material gets on or inside the instrument, remove the instrument’s power cord,
remove the instrument from service, label it as not to be operated, and return the
instrument to Global Specialties for repair. Notify Global Specialties of the nature of
any contamination of the instrument.
Not for Critical Applications:
This instrument is not authorized for use in contact with the human body or for use as
a component in a life-support device or system.
Do not Touch Live Circuits
Do not Attempt Servicing:
Instrument covers must not be removed by operating personnel. Component
replacement and internal adjustments must be made by qualied service-trained
maintenance personnel who are aware of the hazards involved when the instrument’s
covers and shields are removed.
Under certain conditions, even with the power cord removed, dangerous voltages
may exist when the covers are removed. To avoid injuries, always disconnect the
power cord from the instrument, disconnect all other connections (for example,
test leads, computer interface cables, etc.), discharge all circuits, and verify there
are no hazardous voltages present on any conductors by measurements with
a properly-operating voltage-sensing device before touching any internal parts.
Verify the voltage-sensing device is working properly before and after making the
measurements by testing with known-operating voltage sources and test voltages.
Do not attempt any service or adjustment unless another person capable of
rendering rst aid and resuscitation is present. Hazardous voltages may be present
in unexpected locations in circuitry being tested when a fault condition in the circuit
exists
Do not insert any object into an instrument’s ventilation openings or other
openings.

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Servicing
Do not substitute parts that are not approved by Global Specialties or modify this
instrument. Return the instrument to Global Specialties for service and repair to
ensure that safety and performance features are maintained.
Cooling fans
This instrument contains one or more cooling fans. For continued safe operation of
the instrument, the air inlet and exhaust openings for these fans must not be blocked
nor must accumulated dust or other debris be allowed to reduce air ow. Maintain at
least 25 mm clearance around the sides of the instrument that contain air inlet and
exhaust ports. If mounted in a rack, position power devices in the rack above the
instrument to minimize instrument heating while rack mounted. Do not continue to
operate the instrument if you cannot verify the fan is operating (note some fans may
have intermittent duty cycles). Do not insert any object into the fan’s inlet or outlet.
Use Correctly Sized Wires:
To connect a load to the power supply, use a wire diameter large enough to handle
the maximum continuous output short-circuit current of the power supply without the
wire overheating.
For continued safe use of the instrument
• Do not place heavy objects on the instrument.
• Do not obstruct cooling air flow to the instrument.
• Do not place a hot soldering iron on the instrument.
• Do not pull the instrument with the power cord, connected probe, or connected
test lead.
• Do not move the instrument when a probe is connected to a circuit being tested
Safety Notes and Symbols
WARNING A warning statement calls attention to an operating procedure, practice, or
condition, which, if not followed correctly, could result in injury or death to
personnel.
CAUTION A caution statement calls attention to an operating procedure, practice,
or condition, which, if not followed correctly, could result in damage to or
destruction of parts or the entire product.
The following symbol may appear on the product or in its documentation:
Caution, see documentation for details

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Compliance and Certications
CE Compliance
This product meets the essential requirements of the applicable European Directives
as follows:
• 2004/108/EC: Electromagnetic Directive (EMC)
• 2006/95/EC: Low Voltage Directive (LVD)
Disposal
(Applicable in the European Union and other European countries with
separate collection systems). This product is subject to Directive 2012/19/
EU of the European Parliament and the Council of the European Union on
waste electrical and electronic equipment (WEEE), and in jurisdictions
adopting that Directive, is marked as being put on the market after August
13, 2005, and should not be disposed of as unsorted municipal waste.
Please utilize your local WEEE collection facilities in the disposition of this
product.

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Introduction
Overview
The Performance Series (Models 1368, 1369, 1370) are linear triple output power
supplies with fully programmable isolated outputs. These outputs can be adjusted
independently or combined in series or parallel to output higher voltage or current.
Each model offers a different variable output voltage and current on two channels.
The third channel is rated at 6 volts, 5 amps. These supplies offer tracking mode
with user-congurable ratios between channels, access to a timer controlled output
function, and store/recall on up to 40 instrument settings per channel. Connecting to
a PC by USB or RS-232 enables remote instrument control using industry standard
protocols.
Features:
• Three independent and fully isolated channels
• Series and parallel modes connect channels to maximize output voltage or
current
• Fully programmable channels with Output On/Off control
• Simultaneous display of voltage and current settings on all three channels
• High programming and readback resolution of 1 mV / 0.1 mA
• Low ripple, noise, load, and line regulation
• Save and recall up to 40 instrument settings
• USB connector for firmware updates
• Remote sense
• Timer-controlled output function adjustable from 0.1 – 9999.9 s
• Tracking mode maintains a programmed ratio for connected channels
• PC connection/control through RS-232 or USB supporting standard SCPI
commands
• Intelligent fan control, energy saving and noise reduction
• Overvoltage (OVP) and overcurrent (OCP) protection
• Keylock function
Initial Inspection
These units are tested prior to shipment but an initial physical inspection should
be made to ensure that no damage has been sustained during shipment. After the
inspection, verify the contents of the shipment. The included items for this product
are:
• Power Supply
• AC Power Cable
• (2) 250 V Slow Blow Glass Fuses
• Certificate of Calibration and Test Report

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Product Overview
Front Panel
1 2
101112
4 7
8
9
13
14
15
16
653
1. USB interface to update rmware
2. Model name and number
3. LCD display, 480 × 272 pixels, 24-bit color, 4.3-inch color TFT LCD screen
4. Adjustment knob, selection tool and ne adjustments
5. Arrow keys for moving the cursor
6. Numeric keys to input the specic values
7. [ON/OFF] key to turn on or off the three channel outputs simultaneously
8. [MENU] key for quick access to menu interface
9. [ENTER] key to input the data and can be used with the [LOCK/LOCAL] key to
take screenshots
10. Output terminals, channels 1, 2, and 3 from right to left
11. Soft keys to set the display content
12. Power switch to power the unit on or off
13-15. Output keys to individually turn on each of the channel outputs
16. [LOCK/LOCAL] key to lock the keys or switch from remote to local control. Can
be used with the [ENTER] key to take screenshots

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Rear Panel
1
3456
2
3
4
5
6
1. USB Interface for communication by PC via USB DEVICE
2. RS-232 Function is same as USB
3. Power socket connecting 115/230 V 50 Hz AC power supply
4. Remote test terminal adds same function as output in front panel, 4-terminal
sampling function is added for remote sense
5. Serial number
6. Thermostatically controlled fan

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Display
21
34
1. Display menu to display the name of current page
2. Status and error information to display the error information or current working
status.
3. Quick setting and display where to set the voltage, current. Real time sampling
numbers and timing will also be displayed
4. Soft key menu options update on display for each menu

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Operation
• Power on the unit and let warm up for 25 minutes.
• Select the proper connection cable/wire.
• Connect the load to the [+,-] terminal on the power supply.
• In Series or Parallel modes, the connection cable in the output terminal
must be connected in series or parallel. This also applies for rear panel
connections.
• Set the working mode and output parameters and press the corresponding CH
key to output or press ON/OFF for all 3 channels to output simultaneously.
Output Display
Press OUTPUT DISPLAY to enter <OUTPUT> page
<OUTPUT>is displayed as below
You can set the voltage and current for all 3 channels. Here the measured voltage,
current, power, output time and output status are displayed.
Setting the Voltage and Current
The setting range of voltage and current in each channel is from 0 to the MAX value
(The MAX value is decided by different models). Use the direction key or adjustment
knob to move the cursor to the desired setting then set voltage or current one of two
ways:
A: Press knob and rotate it to adjust the value
B: Use number key to input the value, select the unit on the bottom zone or use

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ENTER to input the voltage or current value.
Output
The CH1, CH2, CH3 buttons on the left of panel are matched with output on or off
in the 3 channels. When the parameter is set on one channel press the output; the
button will light up blue. To turn off the channel press the button again. The output will
turn off and the indicator will turn off. The ON/OFF button is used to turn on and off
the output of all 3 channels simultaneously.
CH Set
Press CH SET to enter CH1 individually. Here you may switch and set another
channel by pressing the ◄CH or CH► buttons.
CH1 SET is displayed as below:
On this page the following parameters may be set:
• Voltage, current
• Max Volt - sets the upper voltage limit
• OVP Volt - sets the upper voltage limit, will turn output off if voltage surpasses
this level.
• Time Set - sets the timer value from 0 to 99999.9s for the output, when time
runs out the output is turned off.
• OVP - Turns the Over Voltage Protection on or off
• Timer - Turns the timer on or off

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• SAVE VALUE - Saves the parameters in the CH File for the current channel.
CH File
Press CH FILE to enter <CH1 FILE>. This page is used to recall or delete the saved
data for the specied channel. Up to 40 groups of data can be saved for each
channel including all outputs as a group.
Recall and Delete
There are 4 pages in CH FILE with 10 groups of data on each page. Use the
direction key or PAGE UP and PAGE DOWN to check the data.
To recall data, use knob to select the item then press RECALL. The settings for
the specied channel will now be updated accordingly. To delete this group select
DELETE.
NOTE: The CH FILE is only temporary storage. All data will be cleared when the
device is powered off. The data sets can be saved to internal ash memory to
preserve them. To save and load the saved data from internal memory, refer to menu
set.
Menu Set
Press the MENU key to enter <SYSTEM>. Listed below are the menu options
available:
• Language
• Chinese
• English
• Key voice - turns the beep on and off
• ON
• OFF
• P-Mem
• DEFAULT - factory setting
• USER DATA - saves settings, saved data, and system settings to internal
flash memory to be reloaded after power off and on. If there is any change,
press the USER DATA again to rewrite all data.
• R-Wait - returns display to main output display automatically after a set time
and no live output
• Off
• 5s, 30s, 60s
• Bus Mode - there are three types of communication ports
• RS-232
• USB-CDC

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• USB-TMC
• Baud Rate - the rate at which information is transferred. The higher the baud
rate, the more sensitive the cable is to length and connection quality.
• 4800
• 9600
• 19200
• 38400
• 57600
• 115.2k
• Combine - sets series, parallel, or tracking modes
• Off - turn off combine
• Series - puts CH1+CH2 in series mode. The voltage will sum and the set
current is equal.
• Para - allows for CH1+CH2 in parallel, CH2+CH3 in parallel, or all 3 channels
in parallel, when the set voltage is same and the current will sum.
• Track - allows for CH1+CH2 in tracking mode, CH2+CH3 in tracking mode,
or all 3 channels in tracking mode. In this mode, the set voltage and current
are changed based on current ratio. Before selecting this mode, the voltage
and current must be set in advance.
• If the set voltage/current is 0 before selecting the TRACK, tracking will fail
• Date
• These power supplies have an internal RTC clock. To set the real time
display, move the cursor to this item and press SET, then you can set the
year, month, date, hour, minute, and second

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Specications
All specications apply to the unit after a temperature stabilization time of 20 minutes
over an ambient range of 20°C ± 5°C.
Electrical
Model 1368 1369 1370
Rated Output
(0˚C to 40˚C)
Channel CH1 CH2 CH3 CH1 CH2 CH3 CH1 CH2 CH3
Voltage 0 to 30 V 0 to 6 V 0 to 60 V 0 to 6 V 0 to 30 V 0 to 6 V
Current 0 to 3 A 0 to 5 A 0 to 3 A 0 to 5 A 0 to 6 A 0 to 5 A
Power 210 W 390 W 390 W
Load Regulation
± (% Output +
Bias)
Voltage ≤0.01 % + 3 mV
Current ≤0.01 % + 3 mA
Line Regulation
± (% Output +
Bias)
Voltage ≤0.01 % + 3 mV
Current ≤0.01 % + 3 mA
Programming
Resolution
Voltage 1 mV
Current 0.1 mA
Read-back Value
Resolution
Voltage 1 mV
Current 0.1 mA
Drift (0˚C to
40˚C)
± (% Output +
Bias) per year
Program.
Voltage ≤0.03 % + 10 mV
Current ≤0.1% + 5
mA
≤0.1% +
8 mA
≤0.1% + 5
mA
≤0.1% + 8
mA
≤0.1% + 5
mA
≤0.1% + 8
mA
Read-
back
Voltage ≤0.03 % + 10 mV
Current ≤0.1% + 5
mA
≤0.1% +
8 mA
≤0.1% + 5
mA
≤0.1% + 8
mA
≤0.1% + 5
mA
≤0.1% + 8
mA
Ripple and Noise
(20 Hz to 20
MHz)
Normal Voltage
Mode ≤3 mVp-p ≤4 mVp-p
Normal Current
Mode ≤ 3 mArms ≤ 5
mArms
≤ 4 mArms ≤ 5
mArms
≤ 4 mArms ≤ 5
mArms
Temperature
Factor
Voltage ≤0.02 % + 5 mV
Current ≤0.1 % + 5 mA
Series / Parallel
Accuracy
Voltage ≤0.02 % + 5 mV ≤0.02 % + 10 mV ≤0.02 % + 5 mV
Current ≤0.1 % + 20 mA ≤0.1 % + 30 mA
Timer 0.1 to 99999.9 s
Memory 4 groups of 40 data sets

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Mechanical and Environmental
Model 1368 1369 1370
Weight (lbs) 17.9 28.7
Dimensions
( L x W x H in) 17 x 10.5 x 4.5 19.2 x 10.5 x 4.5
Normal Working Temperature (˚C) 0 to 40, <90% RH
Reference Working Temperature (˚C) 20 ± 8, <80% RH
Pollution Degree 2
Safety
Model 1368 1369 1370
Insulation Safety
(between power terminal and shell)
≥ 50 MΩ for reference conditions
≥ 2 MΩ for hot and humid, non ideal conditions
Dialectric Strength
(between power terminal and shell) 1.5 kV @ 50 Hz line AC for 1 minute
Leakage Current < 3.5 mA
Electromagnetic Compatibility
GB6833.4
GB6833.6
GB6833.10
Electrical Safety IEC 61010-1, CAT II
Interface and Communication
RS-232 and USB are available in these power supplies, which can be used for
data communication and remote control. These cannot be used at the same time.
The commands are the same for all ports, however the hardware conguration and
communication protocol is different.
RS-232 Interface
RS-232 standard, also called as atracking serial communication standard, has been
widely used for data communication between computers and computers to external
equipment. RS is the English abbreviation of Recommended Standard; 232, the
standard number. This standard is created by EIA in 1969, which rules to send one
bit in a data line every time.
As most serial interfaces, the serial interface of this series is also not strictly based on
RS-232 standard but only uses the smallest subset of this standard. The signals are
listed as followings:

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RS-232 Interface
Signal Code Connector Pin Number
Transmitted Data TXD 3
Recieved Data RXD 2
Signal Ground Common GND 5
Note: The pin-out of these power supplies is the same as the standard 9-core
connector. The 9-core DB type socket of RS-232 in these power supplies is as below:
1234
6789
5
The standard 9-core DB type plug can be used directly
WARNING Power supply must be cut when connecting and
disconnecting the connector to avoid the electrical shock.
WARNING Do not short the output terminal, or with body to avoid
damage to the components.
Below is the connection to the PC interface:
PC 1368
DSR(6)
DTR(4)
RXD(2) (2)RXD
TXD(3) (3)TXD
GND(5) (5)GND
RTS(7)
CTS(8)

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Communicate with PC
Based on the table above, the pin-out of these supplies is the same as the 9-core
connector of IMB AT. The user can make 3 wire connection cables (length is less
than 1.5 m) by using double core shielding wire. For custom cables, please note Pin
4 and 6 and Pin 7 and 8 must be shorted in PC interface. Please set the bus mode to
RS-232 in SYSTEM.
RS-232 Parameters
Transmission Mode Full Duplex asynchronous communication including start and
stop bit
Baud Rate 9600 bps
Data Bit 8 BIT
Stop Bit 1 BIT
Verication None
End Symbol NL (line break, ASCII code 10)
Contact Software
Connector DB9 core
USB TMC
USB remote control system can control the device via USB interface. The
communication meet the protocol of USBTMC-USB488 and USB 2.0 for Test and
Measurement Control.
• Connect the USB interface on the rear panel of device to the USB interface in
PC via USB cable. Select the bus mode to “USBTMC” on the power supply.
Reboot is necessary for the choice to reflect on the PC if switching from
USBCDC.
• On Windows both interfaces require the free installation of NI-VISA software,
before connecting the device for the first time. https://www.ni.com/en-us/
support/downloads/drivers/download/packaged.ni-visa.329456.html On Linux
only USBTMC requires the NI-VISA software.
• After the NI-VISA software is installed and the computer is restarted, connect
the device to the PC through a USB cable (2.0 or 3.0).

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• Open NI MAX and expand the “Devices and Interfaces” tree view
Commands
In this device, SCPI commands are referred. SCPI is a tree structure with 3 levels at
most, where the top level is called subsystem command. Only subsystem is selected,
then the bottom level is valid, use the colon to separate the structure.
Execute Commands in NI-VISA
• Select the device under the “Devices and Interfaces” tree view, and click “Open
VISA Test Panel”.
• Then click Next, select the routine of the driver provided by us then Next
• When the driver is installed, you can see USB Test and Measurement Device in
the device manager.