Revision H
May 2000
Copyright 1996,1997,1998,1999,2000
By California Instruments.
All rights reserved.
P/N 5002-966
801P / 1001P / 1251P Series
AC Power Source
User and Programming Manual
User and Programming Manual - Rev H California Instruments
User's Manual
AC Power Source
California Instruments
Models:
⋅ 801P
⋅ 1001P
⋅ 1251P
Copyright 1996,1997,1998,1999,2000 California Instruments, Rev H, May 2000
P Series May 2000 i
User and Programming Manual - Rev H California Instruments
SAFETY SUMMARY
This power source contains high voltage and current circuits which are potentially lethal.
Because of its size and weight, mechanical stability must be ensured. The following safety
guidelines must be followed when operating or servicing this equipment. These guidelines
are not a substitute for vigilance and common sense. California Instruments assumes no
liability for the customer's failure to comply with these requirements.
APPLYING POWER AND GROUNDING
Verify the correct voltage is applied to the unit (100 to 240 VAC Nominal). Verify that the input
power cord is plugged into a properly grounded utility outlet.
FUSES
Use only fuses of the specified current, voltage, and protection speed.
Do not short out the fuse holder or use a repaired fuse.
The 801P/1001P units use a North American ferrule type fuse rated at 15A and 250Volts. (Fast Acting)
The 1251P unit uses a North American ferrule type fuse rated at 20A and 250Volts. (Fast Acting)
DO NOT OPERATE IN A VOLATILE ATMOSPHERE
Do not operate the power source in the presence of flammable gases or fumes.
DO NOT TOUCH ENERGIZED CIRCUITS
Disconnect the power cable before servicing this equipment. Even with the power cable
disconnected, high voltage can still exist on some circuits. Discharge these voltages before
servicing. Only qualified service personnel may remove covers, replace components or make
adjustments.
DO NOT SERVICE ALONE
Do not remove covers, replace components, or make adjustments unless another person, who
can administer first aid, is present.
DO NOT EXCEED INPUT RATINGS
Do not exceed the rated input voltage or frequency. Additional hazards may be introduced
because of component failure or improper operation.
DO NOT MODIFY INSTRUMENT OR SUBSTITUTE PARTS
Do not modify this instrument or substitute parts. Additional hazards may be introduced
because of component failure or improper operation.
MOVING THE POWER SOURCE
When moving the power source, observe the following:
1. Remove all A C power to unit.
2. Use two people to prevent injury.
SURFACE STABILITY
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1. Operate the power source only on a level surface.
ONE YEAR WARRANTY
CALIFORNIA INSTRUMENTS CORPORATION warrants each instrument manufactured by
them to be free from defects in material and workmanship for a period of one year from the date
of shipment to the original purchaser. Excepted from this warranty are fuses and batteries
which carry the warranty of their original manufacturer where applicable. CALIFORNIA
INSTRUMEN TS will service, replace, or adjust any defective part or parts, free of charge, when
the instrument is returned freight prepaid, and when examination reveals that the fault has not
occurred because of misuse, abnormal conditions of operation, user modification, or attempted
user repair. Equipment repaired beyond the effective date of warranty or when abnormal usage
has occurred will be charged at applicable rates. CALIFORNIA INSTRUMENTS will submit an
estimate for such charges before commencing repair, if so requested.
PROCEDURE FOR SERVICE
If a fault develops, notify CALIFORNIA INSTRUMENTS or its local representative, giving full
details of the difficulty, including the model number and serial number. On receipt of this
information, service information or a Return Material Authorization (RMA) number will be given.
Add RMA number to shipping label. Pack instrument carefully to prevent transportation
damage, affix label to shipping container, and ship freight prepaid to the factory. CALIFORNIA
INSTRUMEN TS shall not be responsible for repair of damage due to improper handling or
packing. Instruments returned without RMA No. or freight collect will be refused. Instruments
repaired under Warranty will be returned by prepaid surface freight. Instruments repaired
outside the Warranty period will be returned freight collect, F.O.B. CALIFORNIA
INSTRUMENTS, 9689 Towne Centre Drive, San Diego, CA 92121-1964. If requested, an
estimate of repair charges will be made before work begins on repairs not covered by the
Warranty.
DAMAGE IN TRANSIT
The instrument should be tested when it is received. If it fails to operate properly, or is
damaged in any way, a claim should be filed immediately with the carrier. A full report of the
damage should be obtained by the claim agent, and a copy of this report should be forwarded
to us. CALIFORNIA INSTRUMENTS will prepare an estimate of repair cost and repair the
instrument when authorized by the claim agent. Please include model number and serial
number when referring to the instrument.
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Table of Contents
1. INTRODUCTION ............................................................................................................. 1
1.1 General Description .........................................................................................................1
2. SPECIFICATIONS............................................................................................................ 3
2.1 Electrical ........................................................................................................................3
2.2 Mechanical.....................................................................................................................5
2.3 Environmental.................................................................................................................6
2.4 Regulatory......................................................................................................................6
2.5 Front Panel Controls........................................................................................................6
3. UNPACKING AND INSTALLATION.............................................................................. 10
3.1 Unpacking.................................................................................................................... 10
3.2 Power Requirements ..................................................................................................... 10
3.3 Mechanical Installation .................................................................................................. 10
3.4 Input Wiring.................................................................................................................. 10
3.5 Output Connections .......................................................................................................11
3.6 Output Voltage Ranges ..................................................................................................12
3.7 Functional Test............................................................................................................. 12
4. FRONT PANEL OPERATION....................................................................................... 14
4.1 Front Panel Guided Tour................................................................................................ 14
4.2 How to. .. ......................................................................................................................17
5. PRINCIPLE OF OPERATION ....................................................................................... 20
5.1 General........................................................................................................................ 20
5.2 Overall Description ........................................................................................................ 20
5.3 Power Factor Correction Module (PFC) ........................................................................... 21
5.4 DC - DC Converter Module ............................................................................................. 21
5.5 Oscillator Control Board .................................................................................................22
5.6 DC to AC Power Module................................................................................................ 22
5.7 RS232 Board................................................................................................................ 23
6. CALIBRATION................................................................................................................ 26
6.1 Calibration Equipment ....................................................................................................26
6.2 Routine Calibration........................................................................................................ 26
6.3 Non-Routine Calibration ................................................................................................. 29
7. SERVICE......................................................................................................................... 32
7.1 General........................................................................................................................ 32
7.2 Basic Operation............................................................................................................ 32
7.3 Advanced Troubleshooting.............................................................................................. 34
8. INTRODUCTION TO PGUI/PGUI32 ............................................................................ 38
8.1 About This Program....................................................................................................... 38
8.2 About This Section of the Manual ................................................................................... 38
8.3 Program Requirements.................................................................................................. 38
8.4 RS232C Cable Wiring ....................................................................................................39
9. PGUI/PGUI32 SETUP AND INSTALLATION............................................................... 40
9.1 Connecting the AC Source to the PC ..............................................................................40
9.2 Installing the PGUI Software ...........................................................................................40
9.3 Trouble Shooting - RS232C............................................................................................ 41
9.4 Installed Files ............................................................................................................... 46
9.5 Software Registration..................................................................................................... 47
10. TOP ASSEMBLY REPLACEABLE PARTS.............................................................. 51
11. PROGRAMMING INFORMATION............................................................................. 53
12. INTRODUCTION TO SCPI........................................................................................ 55
12.1 Conventions Used in This Manual ................................................................................... 55
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12.2 The SCPI Commands and Messages ..............................................................................55
12.3 Using Queries ...............................................................................................................57
12.4 Structure of a SCPI Message .........................................................................................58
12.5 SCPI Data Formats .......................................................................................................60
13. SYSTEM CONSIDERATIONS....................................................................................63
13.1 RS232C Interface..........................................................................................................63
14. SCPI COMMAND REFERENCE ................................................................................66
14.1 Introduction ..................................................................................................................66
14.2 Subsystem Commands .................................................................................................66
14.3 System Commands ......................................................................................................71
14.4 Common Commands .....................................................................................................73
15. PROGRAMMING EXAMPLES....................................................................................78
15.1 Introduction ..................................................................................................................78
15.2 Programming the Output ................................................................................................78
15.3 Making Measurements..................................................................................................79
16. STATUS REGISTERS ................................................................................................80
16.1 Power-On Conditions.....................................................................................................80
16.2 Standard Event Status Group .........................................................................................80
16.3 Status Byte Register .....................................................................................................81
16.4 Examples.....................................................................................................................81
INDEX...........................................................................................................................86
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List of Figures
FIGURE 3-1: THE 801P/1001P/1251P AC POWER SOURCE.................................................................. 10
FIGURE 3-2: 1251RP REAR PANEL VIEW........................................................................................... 11
FIGURE 3-3: FUNCTIONAL TEST SETUP............................................................................................... 13
FIGURE 4-1: FRONT PANEL VIEW...................................................................................................... 14
FIGURE 4-2: SHUTTLE KNOB............................................................................................................ 16
FIGURE 5-1: AC SOURCE BLOCK DIAGRAM......................................................................................... 20
FIGURE 5-2: OSCILLATOR AND CONTROLS.......................................................................................... 22
FIGURE 6-1: TEST EQUIPMENT HOOKUP FOR ROUTINE OUTPUT CALIBRATION .............................................. 27
FIGURE 6-2: TEST EQUIPMENT HOOK-UP FOR MEASUREMENT CALIBRATION ............................................ 28
FIGURE 6-3: LOCATION OF INTERNAL ADJUSTMENTS.............................................................................. 30
FIGURE 8-1: RS232C CABLE WIRING ............................................................................................... 39
FIGURE 9-1: SYSTEM PROPERTIES DIALOG BOX .................................................................................. 43
FIGURE 9-2: ADVANCED PORT SETTINGS DIALOG BOX.......................................................................... 44
FIGURE 9-3: COM PORT PROPERTIES DIALOG BOX ............................................................................. 44
FIGURE 12-1: PARTIAL COMMAND TREE............................................................................................. 56
FIGURE 12-2: COMMAND MESSAGE STRUCTURE.................................................................................. 58
FIGURE 13-1: RS232C INTERFACE CABLE WIRING DIAGRAM................................................................... 65
FIGURE 16-1: AC SOURCE STATUS SYSTEM MODEL ............................................................................ 80
List of Tables
TABLE 1: LOGIC BOARD LED'S......................................................................................................... 21
TABLE 2: LOAD AND CURRENT......................................................................................................... 26
TABLE 3: BASIC SYMPTOMS............................................................................................................ 32
TABLE 4: POOR OUTPUT VOLTAGE REGULATION................................................................................... 32
TABLE 5: OVERLOAD LIGHT ON........................................................................................................ 32
TABLE 6: DISTORTED OUTPUT.......................................................................................................... 33
TABLE 7: UNIT SHUTS DOWN AFTER 3-5 SECONDS ................................................................................ 33
TABLE 8: NO OUTPUT AND NO LIGHTS ON FRONT PANEL ......................................................................... 33
TABLE 9: NO OUTPUT BUT "POWER ON" LED IS LIT................................................................................. 33
TABLE 10: REPLACEABLE PARTS..................................................................................................... 51
TABLE 11: BIT CONFIGURATION OF STANDARD EVENT STATUS REGISTER............................................... 75
TABLE 12: *RST DEFAULT PARAMETER VALUES .................................................................................. 76
TABLE 13: STATUS REGISTER POWER ON CONDITION ............................................................................. 76
TABLE A-14: ERROR MESSAGES ..................................................................................................... 84
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1. Introduction
This instruction manual contains information on the installation, operation, calibration and
maintenance of the P Series power sources with programmable controller.
1.1 General Description
The 801P/1001P/1251P AC source is a high efficiency, light weight 800VA, 1000VA or
1250VA programmable AC power source. The output has two voltage ranges of 0-135V or 0270V with a frequency range of 16 Hz to 500 Hz. The maximum output current is 9.2 amps at
135 volts range and 4.6 amps at 270 volts range for the 1250VA model. The maximum output
current is 7.4 amps at 135 volts and 3.7 amps at 270 volts range for the 1000VA model. The
maximum output current is 6. 0 amps at 135 volts and 3.0 amps at 270 volts range for the
800VA model.
The universal nominal input can be from 100 volts to 240 volts at 50 Hz or 60 Hz line frequency.
Simple front panel controls enable the voltage and frequency to be changed. An optional
RS232C serial interface is available for applications that require remote control and
measurements.
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2. Specifications
All specifications at 25± 1°C unless noted otherwise.
2.1 Electrical
2.1.1 Input
Line Voltage: 85V to 264V maximum
100V to 240V nominal
Line Current: 25 A RMS max. (1251RP)
Line Frequency: 47-63 Hertz
Efficiency: 80% (typical) depending on line and load
Power Factor: 0.95 or greater typical
Inrush Current : 70 A peak max. at 260V input
Hold-Up Time: 20 ms (with no effect on output)
Isolation Voltage: Input to output = 2200 VAC, input to chassis = 1350 VAC
2.1.2 Output
Voltage Range: Low Range is 0 to 135 V rms
High Range is 0 to 270 V rms
Voltage Resolution: 0.1 volt
Voltage Accuracy: ±1% or range, 50 to 60 Hz
±2% at 400 Hz
Line & Load Regulation: 2%of FS on low range, 1% of FS on Hi range
Voltage Distortion: 1% max. THD at 50/60 Hz
Total Power: 800VA maximum at full scale voltage either range (model 801P)
1000VA maximum at full scale voltage either range (model 1001P)
1250 VA maximum at full scale voltage either range(model 1251P)
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Current: 6.0 A rms, 17.8 A peak (low range, model 801P)
3.0A rms, 8.9 A peak (high range, model 801P)
7.4 A rms, 22.2 A peak (low range, model 1001P)
3.7 A rms, 11.1 A peak (high range, model 1001P)
9.2 A rms, 27.6 A peak (low range, model 1251P)
4.6 A rms, 13.8 A peak (high range, model 1251P)
Current Limit: 801P 1001P 1251P
135V range: 0.0 to 6.0 7.4 9.2
270V range: 0.0 to 3.0 3.7 4.6
Accuracy: Programmed value +5% of maximum current
Frequency Range: Range Resolution
16.0 - 99.9 Hz 0.1 Hz
100 - 500 Hz 1 Hz
Frequency Accuracy: ±0.02% of program value
DC Offset Voltage: Less than ±25 mV with linear load.
Output Noise: <0.2 volts RMS on 135 range, <0.5 volts RMS on 270 range.
2.1.3 Measurements
Current (TRMS)
Resolution: 0.1 amp
Accuracy: ± 0.2 amp
Voltage Accessible only through RS232
0 - 250V 251 to 270V
Resolution 1 Volts 2 volts
Accuracy: ±4 Volts ±6 volts
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2.1.4 System Specification
Non volatile
Memory Storage: 8 complete instrument setups [ Accessible through RS232C interface
only ].
RS232C Interface: Bi-directional serial interface
[ optional ] 9 pin D-shell connector
Handshake: CTS, RTS
Data bits: 8
Stopbits: 1
Baud rate: 9600
IEEE 488.2 commands and SCPI
2.1.5 Unit Protection
Input Overcurrent : Electronic current limit with fuse.
Input Overvoltage
Transients: Surge protection to withstand EN50082-1 (IEC 801-4, 5) levels.
Output Overcurrent : Shutdown after 0.1 second after overcurrent.
Output Overvoltage: Shutdown, recycle input power to reset.
Output Short Circuit: Peak current limit. Shutdown after 0.1 seconds.
Overtemperature: Automatic shutdown.
2.2 Mechanical
Dimensions: 8.5” (216mm) width x 8.25” (210mm) height x 17.5” (445mm) depth
Unit Weight : 30 lbs/13.6 kgms.
chassis size stand-alone configuration.
Material: Aluminum chassis, panels and cover.
Finish: Powder coat T241-GR11 platinum
Cooling: Fan cooled with air intake on the rear and exhaust to the sides.
Internal Construction: Modular sub assemblies.
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Front panel mounted
output connections:
CEE 7/7 European socket
US domestic Dual 120V line socket
2.3 Environmental
Operating Temp: 0 degrees to +40 degrees Celsius.
Storage Temp: 0 degrees to +70 degrees Celsius .
Humidity: Operating: ≤90% RH up to 40° C.
Storage: ≤90% RH up to 40° C, ≤75% RH up to 70° C.
Creepage and
Clearance: Rated for Pollution Degree 2.
Insulation: Rated to Installation Category(Overvoltage Category) II
Vibration: Designed to meet NSTA 1A transportation levels.
Shock: Designed to meet NSTA 1A transportation levels.
2.4 Regulatory
Electromagnetic Designed to meet EN50081-2 and EN50082-2 European Emissions
Emissions and and Immunity standards as required for the “CE” mark.
Immunity:
Acoustic Noise: 65 dBA maximum at 0% to 50% load, 75 dBA maximum greater than
Safety: Designed to meet UL3111 and EN61010-1 European safety standards
2.5 Front Panel Controls
Controls:
Shuttle knobs:
50% load to 100% load. Measured at one meter.
as required for the “CE” mark.
Allows continuous change of Voltage, Frequency and Current limit.
Function keys:
Controls Output state, Voltage range and Display mode.
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Displays:
Displays:
Two, 4 digits, 0.5” LCD display. For viewing programmed
voltage, frequency and current limit. For displaying measured
current.
Status indicators:
6 LEDs to indicate:
REMOTE, FAULT, OUTPUT (ON/OFF), VOLTAGE RANGE,
FREQUENCY or CURRENT DISPLAY MODE (Refer to paragraph
4.1.2).
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3. Unpacking and Installation
3.1 Unpacking
Inspect the unit for any possible shipping damage immediately upon receipt. If damage is
evident, notify the carrier. DO NOT return an instrument to the factory without prior approval.
Do not destroy the packing container until the unit has been inspected for damage in
shipment.
3.2 Power Requirements
The AC Power System has been designed to operate from a single phase AC line voltage.
The nominal operating voltage is from 100V to 240V line input.
Figure 3-1: The 801P/1001P/1251P AC Power Source
WARNING: Do not connect the unit to a 400-480 service as the result will be a
severely damaged unit.
3.3 Mechanical Installation
The AC Source is a completely self contained power unit. It can be used free standing on a
bench. The unit is fan cooled, drawing air in from the rear and exhausting at the sides. The
sides of the unit must be kept clear of obstruction and a 6 inch clearance must be maintained
to the rear.
3.4 Input Wiring
The AC Source is designed to work from a single utility supply. The IEC 320 input connector
will accept a standard IEC line cord with the appropriate mating connector for the utility outlet.
The utility outlet must be properly grounded and be capable of supplying 1725 VA at nominal
voltage for the 1251P and 1425 VA for the 1001P and 1140 VA for the 801P.
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Figure 3-2: 1251RP Rear Panel View
3.5 Output Connections
3.5.1 Output Wiring
When the low voltage range is selected , only the duplex US NEMA 5-15P output socket will
be active. If the high voltage range is selected, only the European CEE7/7 socket will be
active.
Note: Do not connect these outputs together as this will cause the unit to fault.
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3.6 Output Voltage Ranges
The AC power source has two standard output voltage ranges 0-135V and 0-270V. The
operator may switch from one range to the other at will with no special precautions except to
remember that the output voltage will go to zero voltage whenever a range change takes place.
Note: The output changes to the other socket on front panel with a range change.
3.7 Functional Test
CAUTION: Work carefully when performing these test, hazardous voltages are
present on the input and output during this test..
Refer to Figure 3-3 for the test set up.
1. Connect an oscilloscope, voltmeter and/or distortion analyzer to the AC source output at
the 135 Volt output terminal.
2. Connect the AC power input voltage connections to the AC source input terminals. Turn
on the power switch located at the rear panel.
3. Verify that the front panel LCD display reads out the initial start up voltage and frequency.
4. Select the low voltage range. Set the frequency to 60 Hz with the right shuttle. Select the
current function with the Frequency/Current selector. Set the current limit to the maximum
value using the right shuttle. Set the output voltage to 135V with the left shuttle.
5. Enable the output by pressing the output “on/off” button in the top right of the front panel.
The green LED above the button will illuminate when the output is on. The output should
be a clean 135 volt AC sinewave having less than 1% distortion.
6. Apply full load (refer to table on Figure 3-3) to the output of the source and verify the output
remains within 2% of the initial 135 volt value. The output should still be clean and the
distortion should still be less than 1% at 60 Hz.
7. Using the right shuttle set the output current limit value to 6 amps. The system should go
into current limit and give an error message on the display (err. -300) that indicates an
output fault condition and the output will go off. Return the current value to the maximum
current and disconnect the load.
8. Repeat steps 4 through 7 but set the output for the following: Hi voltage range and the
current limit to maximum value. The output load should be connected to the Hi range
output connector. The load value is shown in Figure 3-3, for the 270 volt output.
Note: Output connectors must be changed when changing voltage ranges.
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In the unlikely event the power source does not pass the functional test, refer to the calibration
procedure on page 6-1 or call California Instrument’s customer satisfaction department for
further assistance.
High Range Load
Low Range Load
Load ON/OFF Switch Oscilloscope
AC
Output
or Distortion
Analyzer
135.0
Unit DMV
Under
Test
AC
Input
Model Range Current Load
1251P 135V 9.2A 14.6Ω
1251P 270V 4.6A 58.6Ω
1001P 135V 7.4A 18.2Ω
1001P 270V 3.7A 72.9Ω
801P 135V 6.0A 22.5Ω
801P 270V 3.0A 90.0Ω
Figure 3-3: Functional Test Setup
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4. Front Panel Operation
4.1 Front Panel Guided Tour
The front panel can be divided in a small number of functional areas:
• Output Sockets
• Status Indicator lights
• Shuttle knobs.
• LCD display
• Button controls
Figure 4-1: Front panel view
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4.1.1 Output Outlets
The Output Sockets are located on the right side of the front panel. It provides connection to
the load from the AC source. When the low voltage range is selected, only the duplex US
NEMA 5-15P output socket will be active. If the high voltage range is selected, only the
European CEE7/7 socket will be active. Refer to Figure 3-1 and Figure 4-1 for socket locations.
4.1.2 Status Indicator Lights
Six LED status indicators are located directly above the LCD display. These LED’s
correspond to the following conditions:
REMOTE The REMOTE LED indicates that the unit is in remote control
mode. If the RS232C interface is used, the REMOTE state
can be enabled by the controller using the SYST:REM
command. Any time the REMOTE LED is lit, the front panel
of the 1001P/1251P unit is disabled. There is no LOCAL
button that allows the user to regain control of the front panel.
The SYST:LOC command will enable the front panel controls
FAULT The FAULT LED indicates an output overvoltage or
overtemperature condition. An overtemperature is mostly
likely caused by poor air flow. Check the air flow intake at the
rear of the unit to make sure it is not obstructed.
OUTPUT The Output LED indicates the status of the OUTPUT ON/OFF
button. When the Output LED is not lit, the output voltage is
not present at the output socket regardless of the voltage
setting.
RANGE The Range LED indicates the selected output voltage range.
When it is illuminated it indicates the high voltage range has
been programmed.
FREQUENCY Illuminates when the LCD display shows the programmed
frequency.
CURRENT Illuminates when the LCD displays shows the programmed
current limit or measured current values.
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4.1.3 The Shuttle Knobs
Counter Clockwise
clockwise
DEC. INC.
Figure 4-2: Shuttle Knob
There are two shuttle knobs located below the LCD display which are used to change setup
parameters for voltage, frequency and current limit. The mode button controls the function of
the right shuttle. The right shuttle will control either the frequency or the current limit as
indicated by the indicator above the right LCD.
4.1.4 FUNCTION Buttons
There are three function buttons for the Output Voltage Range, Output State and Shuttle Mode.
The following is a description of these buttons:
KEY DESCRIPTION
RANGE The RANGE button is used to change the voltage range
OUTPUT The OUTPUT button will toggle the output to enable or
between the low range (0 to 135 volts) and (0 to 270 volts).
The LED above the switch will light to indicate the high
voltage range selection. The output voltage will be reset to
zero voltage after a range change.
disable the output. The LED above the button will light when
the output is on. No output voltage will be present when the
OUTPUT button is off despite the level of voltage
programmed.
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MODE The MODE button will control the function of the right Shuttle
knob and the LCD display. The Shuttle will control the output
frequency and the display will show the program frequency
value when the mode selection is frequency. The Shuttle
knob will program the current limit and the display will show
its value in the current mode. The display will revert back to
showing the measured current after 3 seconds from the last
movement of the shuttle. The measurement is updated 4
times per second. The display mode is indicated by the two
LED’s above the LCD display.
4.1.5 LCD Display
The LCD display consists of two 4 digit, 7 segment displays. The voltage display shows the
programmed voltage. The Frequency/Current display shows either the programmed frequency
or current limit. In the current limit mode the display switches to display the output current
after 3 seconds. The Frequency/Current select button will define the operating mode of the
frequency/current display.
4.2 How to...
This chapter covers some common tasks that are often performed with an AC power source.
These examples are written in a How to... format and provide step by step instructions on how
to set up the AC Source for a specific task.
4.2.1 Set the Output
Output parameters are Voltage, Frequency and Current Limit.
1. Disable the output by pressing the OUTPUT button. The LED above the button will turn off.
2. Use the left shuttle to set the output voltage. Clockwise will increase the output, counter
clockwise will reduce the output. Thedisplay above the shuttle will show the voltage
setting.
3. Use the right shuttle to set the frequency and current limit. The Frequency/Current select
button will define the function of the shuttle and the display above it. The Frequency or
Current LED will turn on to indicate the function controlled by the right shuttle.
4. Enable the output by pressing the OUTPUT button
4.2.2 Slewing Output Values
The output parameters can be slewed using the shuttles.
1. Enable the output by pressing the OUTPUT button. The LED above it will turn on.
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2. Use the left shuttle to set the output voltage. Clockwise will increase the output,
counter clockwise will reduce the output. The display above the shuttle will show the
voltage setting.
3. Use the right shuttle to set the frequency and current limit. The Frequency/Current
button will define the function of the shuttle as indicated by the display above it. The
Frequency or Current LED will turn on to indicate the function in control.
4.2.3 View Current Measurements
Current measurements can be called up as follows:
1. Press the Frequency/Current button to select the Current function.
2. Immediately the Frequency/Current display will show the measured current.
3. Moving the right shuttle will interrupt the current measurement. The display will show
the current limit value.
4. After a short delay the display will revert back to show the measured current.
4.2.4 Voltage Range Change
The voltage range can be changed as follow:
1. Press the HI RANGE button located in the upper left corner. The output voltage will
reset to 0 volts.
2. Use the left shuttle knob to set the output voltage.
4.2.5 Output Control
The Output can be disabled or enabled as follows :
1. Pressing the OUTPUT button when the output LED is on will disable the AC source output.
The programmed voltage setting will remain at the last program value.
2. Pressing the OUTPUT button again will enable the output voltage and the output will revert
to the last programmed value.
4.2.6 Setting the Power on Initialization Values
All P and RP series are supplied with default factory settings when the unit is powered up. The
factory settings are:
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Voltage range Low
Voltage 0 V
Frequency 60 Hz
Current limit Max available current
Display mode Frequency
Output OFF
It is possible to change the power on initialization values in one of two ways:
1. Using the optional RS232 or IEEE-488 (RP only) interface and the supplied PGUI/PGUI32
program.
2. Using the front panel. (requires main firmware release 1.0 or higher).
To change the power on initialization values from the front panel, proceed as follows:
1. Set the unit up in the desired way from the front. (Range, voltage, frequency, current limit,
output relay state). Note: The display mode – frequency or current – is not saved as part
of the set up and always defaults to frequency.
2. Press and hold the Select key (normally toggles between F and C readouts).
3. While holding the Select key, press the OUTPUT ON/OFF key. This will save the present
front panel settings in non volatile memory register (NVM) no 7 and assign this register as
the power on register.
4. Release both keys.
5. This procedure can be repeated as often as needed by the user.
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User and Programming Manual - Rev H California Instruments
5. Principle of Operation
5.1 General
An explanation of the circuits in the AC Source is given in this section. Refer to Figure 5-1 for
a block diagram of the system.
AC Power Factor DC - DC DC - AC AC
Input Corrector (PFC) Converter Converter Output
Oscillator &
Controls
5.2 Overall Description
The AC input is fed to the power factor correction, boost type converter. The converter steps
the voltage to 385 VDC while drawing only sinusoidal current from the input power line.
The DC to DC converter provides isolation and changes the voltage to 250 VDC or 400 VDC
depending on whether the low output range or high output range is selected.
The DC to AC converter develops an AC sine wave voltage at the output range, frequency and
amplitude programmed by the oscillator.
The oscillator board provides the reference signal to the DC to AC converter and has the front
panel shuttles and switches to control and view the setting of voltage, frequency and current
limit.
Figure 5-1: AC Source block diagram
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May 2000 P Series
User and Programming Manual - Rev H California Instruments
5.3 Power Factor Correction Module (PFC)
The P.F.C consists of an input EMI filter, input bridge and boost convert er. The boost converter
is PWM controlled by a single chip that adjusts the pulse width during the cycle so that only
sine wave current is drawn from the supply. An auxiliary winding on the boost inductor provides
“bootstrap” power to the logic circuits and is self sustaining.
5.4 DC - DC Converter Module
The 385 VDC from the boost converter is fed to the DC to DC module. It first supplies 385 volts
DC to the auxiliary power supply. When the auxiliary power supply starts it, it supplies 6
isolated DC supplies to the AC module. It also supplies 15 volts to the DC converter on the
same DC module. The DC to DC converter will then start operating. The DC converter supplies
either 250 volts DC or 400 volts DC to the DC to AC module.
The DC to DC converter is a full bridge converter and the auxiliary converter is a two FET
forward converter.
All the 8 LEDs on the DC-DC board should be lit under normal operation. The LED DS200 is lit
when the DC output is up and within regulation. The amber LEDs DS5, DS4 and DS3 indicate
that the 15V power to the optocouplers on the AC converters is within regulation. The red and
green LED’s, DS7 and DS6 indicate logic power to the AC converter is ok. The red LED DS8
indicates that logic power to the DC converter is within specification at 15 volts. The LED DS2
shows that 24 volt fan power is available.
Table 1: Logic Board Led's
LED# FUNCTION COMMENTS
DS2 24V ok 24 volt fan power is available.
DS3 15V ok 15V power to the optocuplers on the AC converters is within
regulation
DS4 15V ok 15V power to the optocuplers on the AC converters is within
regulation
DS5 15V ok 15V power to the optocuplers on the AC converters is within
regulation
DS6 power ok logic power is ok to the AC converter
DS7 power ok logic power is ok to the AC converter
DS8 power ok logic power is ok to the DC converter
DS200 DC bus ok DC output is up and within regulation
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