Stanford Research Systems PS350 Data Sheet

· 5 kV, 2.5 kV, 1.25 kV supplies

· 25 W output power

· 1 volt resolution

· 0.001 % regulation, 0.05 % accuracy

· Dual polarity

· Programmable limits and trips

· 0.0015 % ripple

· GPIB interface (opt.)

· PS310 ... $1350

(U.S. list)

· PS325 ... $1350 (U.S. list)

· PS350 ... $1350 (U.S. list)

Stanford Research Systems phone: [phone]

www.thinkSRS.com

The PS300 series of high-voltage, DC power supplies consists
of three efficient, microprocessor-controlled, switching power
supplies capable of delivering 25 watts of output power at
voltages up to 5 kV. All models have 0.001 % regulation and

0.05 % accuracy and the output voltage can be adjusted with
one volt resolution over the entire operating range.

All PS300 series supplies have rear-panel SHV (Kings type
1704-1 or equivalent) connectors. Optional cables allow
connection with standard high-voltage connectors (SHV or
MHV). A three-position, high-voltage enable switch on the
front panel prevents the high voltage from being turned on
under computer control unless the switch has been manually
armed. A highly visible red LED always indicates when the
high voltage is on. Convenient front-panel LED displays
indicate both the voltage and current delivered to the load at
all times.

Limits and Trips

The PS300 series power supplies have an adjustable voltage
limit which prevents the high voltage from being
inadvertently set above a safe level. An independent current
limit lowers the voltage setting until the current drawn by the
load does not exceed the limit setting. Additionally, a current
trip may be set which turns off the high voltage when the
current limit is exceeded. After a trip, the unit can be
configured to either attempt to turn the high voltage back on,
or to leave it off until a manual reset.

PS300 Series High Voltage Power Supplies

High Voltage Power Supplies

PS300 Series  1.25 kV (PS310), 2.5 kV (PS325), 5 kV (PS350)

www.thinkSRS.com

Available from:

Thurlby Thandar Instruments Ltd. Glebe Road, Huntingdon, Cambs.
PE29 7DR U.K. Tel: [phone] e-mail:[e-mail]

Web: www.tti-test.com or www.tti.co.uk

PS300 Series High Voltage Power Supplies

Stanford Research Systems phone: [phone]

www.thinkSRS.com

Adjustable Polarity

The output polarity of the PS300 series power supplies is set
with a rear-panel switch. The polarity cannot be controlled via
the computer interface and can only be changed while the unit
is off. Output polarity is always displayed on the front panel
with the voltage level.

Voltage and Current Monitors

Two rear-panel BNC connectors provide voltage and current
monitoring capabilities. A 0 V to 10 V output corresponds to
0 % to 100 % of full scale. These outputs are capable of
driving 10 mA and have a 1 Ω output impedance.

The voltage monitor output can also be configured as a
voltage control input. In this mode, a 0 V to 10 V signal
applied at the input will cause the output high voltage to vary
between 0 % and 100 % of full scale. The output is updated at
a rate of 16 Hz. Additionally, the bandwidth of the voltage
control input is limited by the overall slew rate specification
of the instrument (0 % to 100 % of full scale in less than 0.3 s
under full load).

Stored Settings

All instrument settings are stored in non-volatile memory so
that the instrument will remember its previous state when
powered up. For safety, the high voltage is always initially
turned off. Up to nine complete instrument configurations,
including limit and trip settings, can be stored in memory.
Settings can be recalled manually, or under computer control.

Optional GPIB Interface

An optional GPIB interface allows control of all instrument
functions except output polarity. The required common
commands of the IEEE-488.2 standard are supported. The
power supply can be configured to generate service requests
(SRQ) in the event of limit or trip conditions.

PS300 Series Block Diagram

A high voltage (HV) section converts low drive voltage into high voltage (all high voltage components in the HV section are shielded).
The output voltage (V) and current (I) are sensed and fed back to high-gain compensation circuitry where they are compared to the
programmed values. The compensation circuit controls the output voltage by setting the level of the drive voltage. A diode crossover
allows control of both voltage and current.

Programmed values for the output, limits and trips are set by the microprocessor through a D/A converter. Fast acting limit circuits
check the sensed voltage and current. These work independently of the microprocessor to react quickly in protecting both the supply
and load.

The processor reads the sensed values via an A/D converter and displays them on the front panel. The A/D also reads the External
Voltage Set (when enabled).

Voltage &

Current

Monitor

GPIB

D/A

V Set

I Set

Limits

V Sense

I Sense

Microprocessor

Front Panel and Display

V Drive

Diode
Crossover

High Voltage Section

Shutdown

Trips and Limits

V & I Sense

Polarity

Switch

A/D

HV Connector

External

Voltage

Set

PS300 Series Specifications

Voltage Output

Voltage set accuracy 0.01 % + 0.05 % of full scale
Volt. display accuracy V

set

accuracy ±1 V, typ. (±2 V, max.)
Voltage resolution 1 V (set and display)
Voltage resettability 1 V
Voltage limit range 0 to 100 % of full scale
Voltage regulation 0.001 % for ±10 % line change

0.005 % for 100 % load change
Specifications apply for >0.5 %
(full load) to >1 % (no load) of
full-scale voltage.

Output ripple (rms) <0.0015 % of full scale (typ.)

<0.002 % of full scale (max.)

Current limit range 0 to 105 % of full scale
Trip current 10 µA (min.)
Trip response time <10 µs
Current set accuracy 0.01 % + 0.05 % of full scale
Current resolution 10 µA (PS310 and PS325)

1 µA (PS350)

Current display ±10 µA (typ.), ±20 µA (max.)

accuracy (PS310 and PS325)

±1 µA (typ.), ±2 µA (max.)

(PS350)
Stability 0.01 % per hr., <0.03 % per 8 hrs.
Temperature drift 50 ppm/°C, 0 to 50 °C (typ.)
Protection Arc and short circuit protected;

programmable voltage limit,

current limit and current trip
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 for 0 to full-scale output

regardless of polarity
Current rating 10 mA (max.)
Output impedance <1 Ω
Accuracy 0.2 % of full scale
Update rate 8 Hz

External Voltage Set

Input scale 0 to +10 V for 0 to full-scale

output regardless of polarity
Input impedance 1 MΩ
Accuracy 0.2 % of full scale
Update rate 16 Hz
Output slew rate <0.3 s for 0 to full scale under

full load

Mechanical

HV connector SHV male (Kings type 1704-1)
Mating connector SHV female (Kings type 1705-14)
Dimensions 8.1" × 3.5" × 16" (WHD)
Weight 8 lbs.
Power 50 W, 100/120/220/240 VAC,

50/60 Hz

Warranty One year parts and labor on defects

in materials or workmanship

Stanford Research Systems phone: [phone]

www.thinkSRS.com

Model Output Voltage (+/-) Maximum Current

PS310 12 VDC to 1.25 kV 20 mA
PS325 25 VDC to 2.50 kV 10 mA
PS350 50 VDC to 5.00 kV 5 mA

Ordering Information

PS310 1.25 kV HV power supply $1350
PS325 2.5 kV HV power supply $1350
PS350 5.0 kV HV power supply $1350
Option 01 GPIB computer interface $495
O2D Double rack mount kit $85
O2S Single rack mount kit $85
O3A SHV to SHV cable, 10 ft. $50
O3B SHV to MHV cable, 10 ft. $50

PS350 rear panel (with opt. 01)

Available from:

Thurlby Thandar Instruments Ltd. Glebe Road, Huntingdon, Cambs.
PE29 7DR U.K. Tel: [phone] e-mail:[e-mail]

Web: www.tti-test.com or www.tti.co.uk