B&K Precision 1785B User Manual
Instruction Manual
Model 1785B, 1786B, 1787B & 1788 Programmable DC Power Supplies
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Content
Content ..................................................................................................................................................... 2
Quick Reference ............................................................................................................................................. 3
About your safety.................................................................................................................................... 3
General information ........................................................................................................................ 3
Protection from electric shock ...................................................................................................... 3
Definition of users ........................................................................................................................... 3
Certification and Warranty ..................................................................................................................... 4
Certification...................................................................................................................................... 4
Introduction .............................................................................................................................................. 4
The Front Panel at a Glance................................................................................................................. 5
Function keys description ...................................................................................................................... 5
Menu description .................................................................................................................................... 6
Display annunciators .............................................................................................................................. 6
The Rear Panel at a Glance ................................................................................................................. 7
Chapter 1 Quick Start .................................................................................................................................... 8
1.1 Preliminary Checkout ...................................................................................................................... 8
1.2 Output Checkout .............................................................................................................................. 8
1.2.1 V oltage Output Checkout .................................................................................................... 9
1.2.2 Current Output Check out .................................................................................................... 9
1.3 If the Power Supply Does N ot Turn On ...................................................................................... 10
1.4 To Adjust the Carrying Handle ..................................................................................................... 10
1.5 To Rack Mount the Instrument ..................................................................................................... 11
Chapter 2 Specifications.............................................................................................................................. 13
2.1 Specifications ................................................................................................................................. 13
2.2 Supplemental Character istics ...................................................................................................... 14
Chapter 3 Front-pan el O peration ............................................................................................................... 16
3.1 Front-panel Operation Overview ................................................................................................. 16
3.2 Constant Voltage Operation ......................................................................................................... 16
3.3 Constant Current O peration ......................................................................................................... 17
3.4 Saving and Recalling Operation .................................................................................................. 17
3.5 Menu Operation ............................................................................................................................. 17
Chapter 4 Remote Operat ion Mode .......................................................................................................... 20
4.1 IT-E131 Comm unication cable ..................................................................................................... 20
4.2 Communication setti ng ................................................................................................................. 20
4.3 Frame format .................................................................................................................................. 21
Packet structure ............................................................................................................................ 21
Status packets ............................................................................................................................... 22
4.4 Communication protocol ............................................................................................................... 24
Chapter 5 PV1785B-1788 Software .......................................................................................................... 31
5.1 Introduction ..................................................................................................................................... 31
5.2 System Installati on......................................................................................................................... 31
5.3 Functions of PV-1785B-1788 ....................................................................................................... 31
5.3.1Configure the syst em .......................................................................................................... 32
5.3.2 Status bar ............................................................................................................................. 33
5.3.3 Setting Voltage and current ............................................................................................... 33
5.3.4. GO/NG Test Function........................................................................................................ 35
5.3.5 Save and Open ................................................................................................................... 35
5.3.6 Present Voltage/Current Chart ......................................................................................... 35
5.3.7 Chart Description ................................................................................................................ 36
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Quick Reference
About your safety
Pease review the following safety precautions before operating our equipment.
General information
The following saf ety precautions should be observed before using this product and any
associated instrumentations. Although some instruments and accessories would be
used with non-hazardous voltages, there are situations where hazardous conditions
may be present.
This product is intended for use by qualified personnel who recognize shock hazards
and are familiar with the safety precautions required to avoid possible injury. Read and
follow all instal lati on, o perati on, and m aint enanc e inf ormati on c aref ull y before usi ng the
product. Refer to this manual for compl e te pr oduc t specifications.
If the product is used in a manner not specified, the protection provided by the produc t
may be impaired.
Before performing any maintenance, disconnect the line cord and all test cables.
Protection from electric shock
Operators of this instrumen t must be pr otected from electric shock at all times. The
responsible body must ensure that operators are prevented access and/or insulated
from every connection point. In some cases, connections must be exposed to potential
human contact. Product operators in these circumstances must be trained to protect
themselves from the risk of electric shock. If the circuit is capable of operating at or
above 1000 volts, no conductive part of the circuit may be exposed.
Definition of users
Responsible body is th e indi vi dual or g rou p re sponsi ble for the us e a nd main ten ance of
equipment is operated within its specifications and operating limits, and for ensuring
that operators are adeq uatel y trained.
Operators use the product for its intended function. They must be trained in electrical
safety procedures and proper use of the instrument. They must be protected from
electric shock and contact with hazardous live circuits.
Service is only to be performed by qualified service personnel.
Safety symbols and terms
Connect it to safety earth ground using the wire recommended in the user
manual.
The symbol on an instrument indicates that the user should refer to the
operating instructions located in the manual.
High voltage danger
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Certification and Warranty
Certification
We certify that this product met its p ublis hed spec ificatio ns at time of shipment fr om the
factory.
Introduction
The 1785B - 1788 Series power supplies are high performance single-output
programmable DC power supplies with communication interface. The combination of
bench-top and system featur es in these power supplies provides versatile solutions for
your design and test requirements.
Convenient bench-top feat ur es :
• Nice appearance, small-size and light weight
• VFD display
• Soft Rubber numeric keypad
• Adjustable & constant voltage outputs
• Adjustable & constant current outputs
• Output on/off
• High accuracy and high resolution
• Excellent load and line regulation
• Low ripple and noise
• Limit voltage protection
• Over current/temperature protection
• Sixteen operating states storage
• May be used in series or parallel modes with additional power supplies
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The Front Panel at a Glance
Set the output voltag e value
Set the current value
Save the present settings to a specified register location(1~16)
Recall a saved settings from location ‘‘1’’through ‘‘16’
Menu function to set related parameters of the power supply
Output ON/OFF, to enable/disable the output
V-set
I-set
Save
Menu
Recall
Out on/off
① 10 digits VFD display
② Status information for operating mode and working status
③ Power switch
④ Number keys
⑤ Function keys
⑥ UP/DOWN and ENTER key
⑦ Output terminals
Function keys description
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Menu description
>MAX VOLT
Set the maximum output voltage value
>INIT OUT
Initiate the output state to ON or not
>INIT VOL
Initiate the output voltage to 0 volt or not
>KEY SOUN
Switch On/Off the buzzer sound when you press
any key
>BAUD
RATE
Set the communication baud rate
>ADDR
Set the communication address
>KEY LOCK
Set the password for function keys
>EXIT
Exit
OFF
The power supply’s
output is off
Timer
Not used
CV
Constant voltage
mode
Sense
Not used
CC
Constant current
mode
Ext
Not used
*
Not used
Adrs
The instrument is
communicating with an
IT-E131/IT-E132/IT-E133
Meter
Meter mode
Rmt
The instrument is in remote
state. The only active key is
the Local KEY.
Shift
Not used
Error
The instrument has err or
OVP
Over voltage protect
state
Prot
Not used
OCP
Over current protect
state
Lock
The keyboard is locked by a
password
Display annunciators
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1
2
4
3
51
2
4
3
5
The Rear Panel at a Glance
① Cooling window
② DB9 interface connector
③ 110V/220V selector
④ Fuse
⑤ Power socket
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Chapter 1 Quick Start
□
□
□
ERR EEPROM
ERROR CAL
Warning
supply without adequate cabine t g round connection.
One of the first things you will want to do with your power supply is to become acquainted with the front
panel. The exercises in this chapter prepare the power supply for use and help you get familiar with
some of its front-panel operations.
This chapter is intended for both the experienced and the inexperienced user because it calls attention
to certain checks that should be made prior to operation.
1.1 Preliminary Checkout
The following steps help you verify that the power supply is ready for use.
1．Check the list of supplied items.
Verify that you have received the following items with your power supply. If anything is missing, contact
your nearest Sales Office.
One power cord for your location
This User’s Manual.
Communication cable
2．Connect the power cord and turn on the power supply.
When you turn on the power supply, the front-panel display will light up briefly while the power supply
performs its power-on self-test. All the VFD annunciators will light up at once. To review the display with
all annunciators, you can check if there is any stroke loss on any annunciator. If there isn’t any response
when you power on the power supply, please see Section 1.5 on page 10 for some service information.
If the EEPROM was dam aged or the latest op er ati on data in EEPROM was lost, the VFD will display as
follows:
If the calibration data in EEPROM was lost, the VFD will display as follows:
the third conductor being the groun d . The power supply is grounde d o n ly when the
power-line cord is plugged into an app ropriate receptacle. Do not operate your power
: Your power supply is equipped with a 3-wire gro u n d ing type power cord;
1.2 Output Checkout
The following procedures check to ensure that the power supply develops its rated outputs and properly
responds to operation from the front panel.
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Warning：
Out on/off
Out on/off
Out on/off
1.2.1 Voltage Output Checkout
The following steps verify basic voltage functions without load.
1. Turn on the power supply.
2. Enable the outputs.
Press key to let the
ON annunciator and the CV annunciator turn on to light.
Notice: if the voltage value flash, then the power supply is in Set mode, ‘‘Set mode’’ means that the VFD
display shows the setting output voltage and current. Or the power supply is in Meter mode, ‘Meter
mode” means that the VFD display shows the actual output voltage and current and the ”Meter”
annunciator is lit.
3. Check that the front-panel voltmeter prop er ly responds to number keys
Set some different voltage values, then wait till the Meter mode to check if the VFD displayed voltage
value is the same as the set voltage value, and to check if the VFD displayed current value is nearly
zero.
4. Ensure that the voltage can be adjusted from zero to the full rated value.
1.2.2 Current Output Checkout
The following steps check basic current functions with a short across the power supply’s output.
1. Turn on the power supply.
2. Disable the output
Press key to ensure that the output is disabled. The OFF annunciator is turned on.
3. Connect a short across (+) and (-) output terminals with an insulated test lead.
Use a wire size sufficient to handle the maximum current.
overheat when carrying the maximum short-circuit output current of the power
supply. If there is more than one load, then any pair of load wires must be capable of
safety carrying the full-rated current of the power supply.
4. Enable the output.
Press key to ensure that the output is enabled. The OFF annunciator is turned off.
5. Adjust the voltage value to 1.0 volt.
Adjust the voltage to 1.0 volt to ensure the power supply is in CC operation mode. The
will turn on.
6. Adjust the current value.
Set some different voltage values, then wait till the Meter mode to check if the VFD displayed current
value is the same as the set voltage value, and to check if the VFD displayed voltage value is nearly
zero.
7. Ensure that the current can be adjusted fr o m zero to the full rated value.
8. Turn off the power supply and remove the short wire from the output terminals.
To satisfy safety requirements, load wires must be heavy enough not to
CC annunciator
9
1.3 If the Power Supply Does Not Turn On
Model
Fuse Description
1785B,
Fuse 2.5A T 250V for 220VAC
Fuse 5A T 250V for 110VAC
1788
Fuse 3.15A T 250V for 220VAC
Fuse 6.3A T 250V for 110VAC
Use the following steps to help solve problems you might encounter when turning on the instrument. If
you need more help, refer to chapter 6 for instructions on returning the instrument to the supplier for
service.
1. Verify that there is AC power to the power supply.
First, verify that the power cord is firmly plugged into the power receptacle on the rear panel of the power
supply. You should also make sure that the power source you plugged the po wer suppl y into is
energized. Then, verify that the power supply is turned on.
2. Verify the power-line voltage setting.
The line voltage is set to the proper value for your country (110VAC or 220VAC). Change the vo ltag e
setting if it’s not correct.
3. Verify that the correct power-line fuse is installed.
If the fuse was damaged, please see the table below to replace the fuse for your power supply.
1786B,
1787B
1.4 To Adjust the Carrying Handle
To adjust the position, grasp the handle by the sides and pull outward. Then, rotate the handle to the
desired position.
Bench-top viewing positions Carrying position
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1.5 To Rack Mount the Instrument
You can mount the power supply in a standard 19-inch rack cabinet using the IT-E151 rack mount kit.
Note: Remove the carrying handle and the two plastic ears before rack-mounting the instrument.
To remove the handle, grasp the handle by sides and pull outwards and rotate it to a special position to let
the arrow on the handle and the arro w on the plastic ears be in opposite directions, then pull the handle
outward. After removing the handle, you can use a screwdriver to remove the two plastic ears.
To rack mount a single instrument, order rack mount kit IT-E151
Side view of rack mounting a single instrument
To rack mount two instruments side-by-side, order rack mount ki t IT-E151, you
needn’t to use the front cover panel.
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Dimension unit (mm)
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