Stanford Research Systems PS355 Operation manual

Operation and Service Manual
High Voltage Power Supplies
PS355, PS365, PS370, PS375
Stanford Research Systems
Revision 1.0 ·December, 2008

Stanford Research Systems
PS300 Series High Voltage Power Supplies
Certi cation
Stanford Research Systems certifies that this product met its published specifications at the time
of shipment.
Warranty
ThisStanfordResearchSystemsproduct iswarrantedagainstdefectsinmaterialsandworkmanship
for a period of one (1) year from the date of shipment.
Service
For warranty service or repair, this product must be returned to a Stanford Research Systems
authorized service facility. Contact Stanford Research Systems or an authorized representative
before returning this product for repair.
Contact nformation
Stanford Research Systems, Inc.
1290-D Reamwood Avenue
Sunnyvale, CA 94089 USA
Phone: [phone]
Fax: [phone]
www.thinkSRS.com
[email protected]
Information in this document is subject to change without notice.
Copyright © Stanford Research Systems, Inc., 2008. All rights reserved.
Printed in U.S.A.
Document number: 9-01637-903

i
General Information . . . . . . . . . . . . . . . . . . iii
Symbols . . . . . . . . . . . . . . . . . . . . . . . . . iv
Notation. . . . . . . . . . . . . . . . . . . . . . . . . v
Specifications . . . . . . . . . . . . . . . . . . . . . . vi
1 Instrument Overview . . . . . . . . . . . . . . . . . 1 – 1
1.1 Front Panel . . . . . . . . . . . . . . . . . . . . 1 – 2
1.2 Rear Panel . . . . . . . . . . . . . . . . . . . . 1 – 3
2 Guide to Operation . . . . . . . . . . . . . . . . . . 2 – 1
2.1 Seing Parameters . . . . . . . . . . . . . . . . 2 – 2
2.2 Reset. . . . . . . . . . . . . . . . . . . . . . . . 2 – 3
2.3 Store and Recall . . . . . . . . . . . . . . . . . 2 – 3
2.4 Error Messages. . . . . . . . . . . . . . . . . . 2 – 4
2.5 Analog Monitor and Control . . . . . . . . . . 2 – 4
2.6 Default State . . . . . . . . . . . . . . . . . . . 2 – 5
3 Remote Operation . . . . . . . . . . . . . . . . . . . 3 – 1
3.1 Index of Common Commands . . . . . . . . . 3 – 2
3.2 Alphabetic List of Commands . . . . . . . . . 3 – 3
3.3 Introduction . . . . . . . . . . . . . . . . . . . 3 – 4
3.4 Commands . . . . . . . . . . . . . . . . . . . . 3 – 4
3.5 Status Model . . . . . . . . . . . . . . . . . . . 3 – 12
3.6 Status Reporting . . . . . . . . . . . . . . . . . 3 – 13
4 Troubleshooting . . . . . . . . . . . . . . . . . . . . 4 – 1
4.1 Troubleshooting the PS300 . . . . . . . . . . . 4 – 2
Contents

Stanford Research Systems
PS300 Series High Voltage Power Supplies
Contentsii

iii
General nformation
The PS300 Series High Voltage Power Supplies are general purpose
instruments designed for laboratory environments.
This unit contains hazardous high voltages. Make certain the high
voltage is completely discharged before removing the cable. The
charge on the cable can cause injury or damage.
The PS300 series supplies operate from a 90 VAC to 264 VAC
power source having a line frequency between 47 Hz and 63 Hz.
Power consumption is less than 80 VA total.
A power entry module, labeled AC POWER on the back panel of the
PS300, provides connection to the power source and to a protective
ground.
The PS300 uses a detachable, three-wire power cord for connection to
the power source. The exposed metal parts of the box are connected
to the power ground to protect against electrical shock. Always use
an outlet which has a properly connected protective ground.
The rear-panel high voltage connector and the BNC shields are also
connected to chassis ground. The PS300 series supplies CANNOT
be floated.
The line fuse is internal to the instrument and may not be serviced
by the user. Operate only with covers in place to avoid personal
injury. Do not remove the product covers or panels. Do not operate
the product without all covers and panels in place.
The PS300 does not include any user-serviceable parts inside. Refer
service to a qualified technician.
Warning
Line Voltage
Service

Stanford Research Systems
PS300 Series High Voltage Power Supplies
Contentsiv
Symbol Description
Alternating current
Caution - risk of electric shock
Frame or chassis terminal
Caution - refer to accompanying documents
Earth (ground) terminal
Battery
Fuse
On (supply)
Off (supply)
Symbols you may  nd on SRS products

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PS300 Series High Voltage Power Supplies
Contents v
Typeseing conventions used in this manual are as follows:
· Front-panel buons are represented as [Buon]
· The [▲] and [▼] keys increment and decrement a digit.
· The [◄] and [►] keys select a digit.
· Front-panel indicators are represented as Overload
· The state of a switch is represented in italics as ON
· Remote command names are represented as *IDN?
· Literal text other than command names is represented as OFF
Remote command examples will all be set in monospaced font.
In these examples, data sent by the host computer is set as
straight teletype font, while responses received by the
host computer are set as slanted teletype font .
Notation

Stanford Research Systems
PS300 Series High Voltage Power Supplies
General Informationvi
Model Output Voltage (±) Maximum Current
PS355 - 100 V to - 10 kV 1 mA
PS365 +100 V to +10 kV 1 mA
PS370 - 100 V to - 20 kV 500 µA
PS375 +100 V to +20 kV 500 µA
Voltage Output
Voltage set accuracy 0.01 % + 0.05 % of full scale
Voltage display accuracy Vset accuracy ± 1 V, typ. (± 2 V, max.)
Voltage resolution 1 V (set and display)
Voltage reseability 1 V
Voltage limit range 0 to 100 % of full scale
Voltage regulation 0.001 % for ±10 % line change,
0.04 % for 100 % load change.
Specifications apply for >0.5 % (full load) to
>1 % (no load) of full-scale voltage.
Output ripple (rms) <0.01 % of full scale (max.)
Current limit range 0 to 105 % of full scale
Current trip range 0 to 105 % of full scale
Trip response time <10 ms
Current set accuracy 1 µA
Current resolution 1 µA
Current display accuracy ±1 µA (typ.), ±2 µA (max.)
Stability 0.01 % per hr., <0.03 % per 8 hrs.
Temperature dri50 ppm/°C, 0 to 50 °C (typ.)
Protection Arc and short circuit protected (programmable
voltage limit, current limit, and current trip)
HV output slew rate 7,000 V/s, typ. (PS355 and PS365)
14,000 V/s, typ. (PS370 and PS375)
Recovery time 12 ms for 40 % step change in load current (typ.)
Discharge time <6 s (to <1 % of full-scale voltage with no load, typ.)
Monitor Output
Output scale 0 to +10 V
(0 to full-scale output regardless of polarity)
Current rating 10 mA (max.)
Output impedance <1 Ω
Speci cations

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PS300 Series HighVoltage Power Supplies
General Information vii
Accuracy 0.2 % of full scale
Update rate 87.5 Hz
External Voltage Set
Input scale 0 to +10 V
(0 to full-scale output regardless of polarity)
Input impedance 1 MΩ
Accuracy 0.2 % of full scale
Update rate 87.5 Hz
Mechanical
HV connector Kings type 1064-1 (PS355 and PS365)
Kings type 1764-1 (PS370 and PS375)
Mating connector Kings type 1065-1 (PS355 and PS365)
Kings type 1765-1 (PS370 and PS375)
Dimensions 8.1″× 3.5″× 16″(WHD)
Weight 8 lbs.
Power 50 W, 90 to 264 VAC, 47 to 63 Hz
Warranty One year parts and labor on defects in materials
or workmanship
All performance specifications apply aĞer a one hour warm-up period

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PS300 Series HighVoltage Power Supplies
General Information viii

1 – 1
1 Instrument Overview
In This Chapter This chapter gives the user the necessary information to get
started with the PS300 Series High Voltage Power Supplies.
1.1 Front Panel . . . . . . . . . . . . . . . . . . . . . . . 1–2
1.1.1 Power Buon . . . . . . . . . . . . . . . . . 1–2
1.1.2 High Voltage Enable Switch . . . . . . . . . 1–2
1.1.3 Numeric Displays . . . . . . . . . . . . . . . 1–3
1.1.4 Select, Enter, Clear . . . . . . . . . . . . . . 1–3
1.1.5 Numeric and Cursor Keys . . . . . . . . . . 1–3
1.1.6 Instrument Status . . . . . . . . . . . . . . . 1–3
1.1.7 Other Keys . . . . . . . . . . . . . . . . . . . 1–3
1.1.8 Store and Recall . . . . . . . . . . . . . . . . 1–4
1.2 Rear Panel. . . . . . . . . . . . . . . . . . . . . . . . 1–4
1.2.1 Power Entry Module . . . . . . . . . . . . . 1–4
1.2.2 High Voltage Connector . . . . . . . . . . . 1–4
1.2.3 Analog I/O . . . . . . . . . . . . . . . . . . . 1–5
1.2.4 IEEE-488 Port . . . . . . . . . . . . . . . . . 1–5
1.2.5 RS-232 Port. . . . . . . . . . . . . . . . . . . 1–5

Stanford Research Systems
PS300 Series High Voltage Power Supplies
Instrument Overview1 – 2
1.1 Front Panel
1.1.1 Power Button
1.1.2 High Voltage Enable witch
The front-panel features of the PS300 Series High Voltage Power
Supplies are examined in this section.
The PS300 is turned on by depressing the [POWER] buon. The
unit always powers up with the high voltage OFF. The current
instrument configuration and any saved instrument presets are
stored in non-volatile memory. The model number (355, 365, 370
or 375), firmware version, and serial number are displayed when
power is turned on. If an error appears on power up, the current
instrument configuration and any saved presets are lost, and the
default seings are used. If the default seings are desired, hold
down the clear key [CLR] while turning on the power. Note that
this will clear out all buffers and erase any saved presets.
The [High Voltage] enable switch has three positions that perform
several functions. In the down position, the high voltage is OFF,
and all trips are cleared. In this position, the high voltage is locked
OFF and cannot be turned on over the computer interface. The
UP position is momentary, and it turns on the high voltage for
manual or rear-panel analog control. In the middle position, the
high voltage is enabled (but not necessarily ON) and can be turned
on over the computer interface. The large red ON LED above the
switch indicates that the high voltage is on; the yellow TRIP LED
indicates a trip has occurred.

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PS300 Series High Voltage Power Supplies
Front Panel 1 – 3
The two large displays show output voltage to five significant digits
and output current to four significant digits. The polarity is indicated
below the voltage display as either POSITIVE or NEGATIVE. The
smaller center display shows the value of the parameter that is
being entered or adjusted. That parameter is indicated by the row
of LEDs directly below the center display.
[SELECT] is used to choose which parameter is being displayed in
the center display. [ENTER] confirms the entry in the center display.
[CLR] erases the value in the middle display and recalls the last
value that was entered. To adjust a value, [SELECT] is pressed until
the appropriate LED is lit. When the value is being changed, the LED
will flash to indicate the value is in a state of change. If an incorrect
value is entered, press [CLR] to start over. When the desired value
is displayed, [ENTER] updates the unit’s actual seing and stops
the LED from flashing.
All parameters may be adjusted using the cursor or numeric keys.
When using the cursor, the digit being adjusted in the center display
will flash. The [▲] and [▼] keys increment and decrement the digit.
The [◄] and [►] keys select the flashing digit. When using direct
numerical entry, simply press the number and decimal point keys
until the desired value appears on the center display. Note that the
current is specified in microamps.
Three LEDs indicate the instrument’s status. The LIMIT LED is on
when the unit is in a current limit state. REM is on when the front
panel is locked out. REAR is on when the high voltage seing is
programmed by the rear-panel analog input.
[RESET] toggles the reset mode between AUTO and MAN (manual).
[GPIB] displays the GPIB address in the center display so it can be
adjusted. It also functions as the [LOCAL] key when the unit is in
the remote mode.
1.1.3 Numeric Displays
1.1.4 elect, Enter, Clear
1.1.5 Numeric and Cursor Keys
1.1.6 Instrument tatus
1.1.7 Other Keys

Stanford Research Systems
PS300 Series High Voltage Power Supplies
Instrument Overview1 – 4
Store [STO] and Recall [RCL] allow up to nine complete instrument
configurations to be saved in nonvolatile memory. [RCL] 0 recalls
the default seings.
The rear panel of the PS300 Series High Voltage Power Supplies is
discussed next.
The AC line cord plugs into the power entry module. Refer to the
General Information section of this manual for instructions on line
voltage.
WARNING — This unit contains hazardous voltages. Please make
certain that the high voltage is completely discharged before
removing or connecting the high voltage cable. High voltage cables
can store charge. If they are disconnected from the supply while
high voltage is present, electric shock can occur which may cause
injury or damage the unit.
The high voltage output connector is a Kings type 1064-1 (PS355
and PS365) or a Kings type 1764-1 (PS370 and PS375). Please make
certain that the high voltage is completely discharged before
changing the cable. Cables are available from SRS.
1.1.8 tore and Recall
1.2 Rear Panel
1.2.1 Power Entry Module
1.2.2 High Voltage Connector

Stanford Research Systems
PS300 Series High Voltage Power Supplies
Instrument Overview1 – 5
The two MONITOR output BNCs are used to monitor the voltage
and current signals. Both are 0 to +10 V outputs corresponding to
0 to full scale. The SET input BNC receives an analog programming
voltage, 0 to +10 VDC corresponding to 0 to full scale (independent
of high voltage polarity). To select the rear SET analog high voltage
control, press [SELECT] on the front panel until REAR is selected,
and then use the [▲] and [▼] keys to choose between “Front” and
“Rear”. Press [ENTER] to confirm the selection.
The 24-pin IEEE-488 (GPIB) connector allows computer control of
PS300 series supplies. The address is set from the front panel using
the [GPIB] key.
The 9-pin female D-sub connector allows computer control of
power supply via RS-232. The interface seings are fixed as DCE,
9600 baud, no parity, 8 bits, 1 stop bit.
1.2.3 Analog I/O
1.2.4 IEEE-488 Port
1.2.5 R -232 Port

Stanford Research Systems
PS300 Series High Voltage Power Supplies
Instrument Overview1 – 6

2 – 1
2 Guide To Operation
In This Chapter This chapter explains how to operate the PS300 Series High
Voltage Power Supplies.
2.1 Seing Parameters . . . . . . . . . . . . . . . . . . . 2–2
2.1.1 Seing the Output Voltage . . . . . . . . . . 2–2
2.1.2 Seing the Voltage Limit . . . . . . . . . . . 2–2
2.1.3 Seing the Current Limit. . . . . . . . . . . 2–3
2.1.4 Seing the Current Trip . . . . . . . . . . . 2–3
2.2 Reset . . . . . . . . . . . . . . . . . . . . . . . . . 2–3
2.3 Store and Recall . . . . . . . . . . . . . . . . . . . . 2–3
2.4 Error Messages . . . . . . . . . . . . . . . . . . . . . 2–4
2.5 Analog Monitor & Control . . . . . . . . . . . . . . 2–4
2.5.1 Voltage Set . . . . . . . . . . . . . . . . . . . 2–4
2.5.2 Voltage Monitor . . . . . . . . . . . . . . . . 2–4
2.5.3 Current Monitor. . . . . . . . . . . . . . . . 2–4
2.6 Default State . . . . . . . . . . . . . . . . . . . . . . 2–5

Stanford Research Systems
PS300 Series High Voltage Power Supplies
Guide to Operation2 – 2
2.1 Setting Parameters
2.1.1 Setting the Output Voltage
2.1.2 Setting the Voltage Limit
This section describes how to set the front-panel parameters.
The voltage set can be changed with the high voltage in either the
ON or OFF mode.
To set the high voltage output, press the [SELECT] key until the
voltage SET LED is lit. The present value of the set voltage will
be displayed in the center window. To change the value, enter the
desired voltage by using either the numeric keys or cursor. Aer the
new value has been entered into the center display, press [ENTER]
to update the output voltage. The voltage SET LED will flash until
[ENTER] or [CLR] is pressed to remind you that the displayed value
is not the actual programmed value. If an Err2 message appears
(illegal parameter entered), check the voltage limit to see that it is
greater than or equal to the desired set voltage. Use the [CLR] key
to clear any error message.
If the REAR status LED is lit, the high voltage is programmed from
the analog set input on the rear panel. In this mode, if the center
display is showing voltage SET , the displayed value is the present
value of the high voltage programmed by the 0 to 10 V input and
cannot be adjusted from the front panel.
The voltage limit is a protection feature to prevent the output voltage
from being set too high or overshooting because of dramatic load
changes. The output voltage cannot be set higher than the voltage
limit. In addition, if the output ever exceeds the limit by more than
2 % of full scale, the unit trips and the high voltage is disabled. If
this occurs, a VTRP (voltage trip) message appears in the middle
display.
Aer a trip, it is not necessary to clear the trip before turning the
high voltage back on. If it is necessary to change a parameter before
turning the high voltage back on, pressing [CLR] or puing the
high voltage switch in the OFF position will clear the trip.
To set the voltage limit, press [SELECT] until the voltage LIMIT
LED is lit. The present value of the voltage limit is displayed in
the center window. Change it with either the numeric keys or the

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PS300 Series High Voltage Power Supplies
Seing Parameters 2 – 3
cursor and press [ENTER] to update the actual limit value. If an
Err2 message appears (illegal parameter entered), check to see that
the output voltage is less than or equal to the voltage limit.
Current limiting varies the output voltage to limit the output current
to less than or equal to the programmed current limit value. When
the unit is current limited, the LIMIT LED is lit. The current limit is
set in the same fashion as the voltage limit — selecting the present
value on the center window, changing it and then entering the new
value.
The current trip shuts offthe high voltage when the output current
exceeds the trip value. The current trip value is set in the same
fashion as the voltage and current limits. Aer a current trip occurs,
the ITRP (current trip) message will appear in the middle display.
Current trips are cleared just like voltage trips.
The reset mode determines how the unit responds aer a voltage
or current trip.
In MAN (manual) mode, the high voltage remains OFF aer a trip
and requires that the operator turn it back ON.
In AUTO (automatic) mode, the unit waits until the later of the time
for the output voltage to fall to 0.5 % of full-scale or two seconds,
and then turns the high voltage back ON. This is useful when
dealing with loads that occasionally short circuit but recover aer
removing the high voltage.
The store and recall functions allow up to nine complete instrument
setups to be saved. To store a setup, press the [STO] key followed by
a number (1 to 9) and then the [ENTER] key. To recall a setup, press
the [RCL] key, followed by a number (0 to 9) and then the [ENTER]
key. [RCL] 0 returns the setup to the factory default. Whenever
a setup is recalled, the high voltage is turned offfor safety. If an
Err3 (recall error) occurs, then that stored setup was lost due to a
memory error and must be re-entered.
2.1.3 Setting the Current Limit
2.1.4 Setting the Current Trip
2.2 Reset
2.3 Store and Re all

Stanford Research Systems
PS300 Series High Voltage Power Supplies
Guide to Operation2 – 4
The following error messages may appear in the center display. The
[CLR] key clears the errors.
Err1 Memory error – Power on memory error of the unit’s
last setup. Default setup is recalled.
Err2 Illegal parameter entered.
Err3 Recall Error – the stored setup was lost.
Err4 Illegal storage address.
(Address 0 is reserved for default seings)
Err5 Device dependent
Err6 Syntax error over GPIB.
Err7 Illegal parameter entered over GPIB.
Parameter entered is out of range.
Err 8 Remote communication error
Err9 Hardware watchdog
When configured for rear control (see § 1.2.3) the rear-panel SET
voltage will set the output voltage. When enabled, the REAR (rear
panel) status LED is lit, and the output voltage being set by the
rear panel is displayed in the middle display (when it is showing
voltage SET) . The voltage limit is still active and does not allow
the rear-panel voltage to set the output above the voltage limit. If
the rear-panel voltage is too high, the output voltage will stop at
the limit voltage. An input from 0 to +10 V will program the high
voltage from 0 to full scale, regardless of polarity.
The voltage monitor BNC is a monitor output providing 0 to +10
volts for a 0 to full-scale output, regardless of polarity.
2.4 Error Messages
2.5 Analog Monitor & Control
2.5.1 Voltage Set
2.5.2 Voltage Monitor