SRS DC205 Owner's manual

Operation and Service Manual

Precision DC Voltage Source

DC205

Stanford Research Systems

Revision 1.15 •October 25, 2019

Certiﬁcation

Stanford Research Systems certiﬁes that this product met its published speciﬁcations at the time

of shipment.

Warranty

This Stanford Research Systems product is warranted against defects in materials and workman-

ship 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.

Information in this document is subject to change without notice.

Copyright c

Stanford Research Systems, Inc.

1290–D Reamwood Avenue

Sunnyvale, CA 94089 USA

Phone: (408) 744-9040 •Fax: (408) 744-9049

www.thinkSRS.com •e-mail: [email protected]

Printed in U.S.A. Document number 9-01745-903

DC205 Precision DC Voltage Source

Contents

General Information v

Safety and Preparation for Use . . . . . . . . . . . . . . . . v

Symbols ............................. vi

Notation ............................. vii

Warnings............................. vii

Speciﬁcations . . . . . . . . . . . . . . . . . . . . . . . . . . viii

1 Getting Started 1 – 1

1.1 How to use this manual . . . . . . . . . . . . . . . . . 1 – 2

1.2 Preliminaries........................ 1–2

1.2.1 Equipment needed . . . . . . . . . . . . . . . . 1 – 2

1.3 First example: turning on the instrument . . . . . . . 1 – 2

1.4 User interface . . . . . . . . . . . . . . . . . . . . . . . 1 – 4

1.5 Instrument settings . . . . . . . . . . . . . . . . . . . . 1 – 5

1.5.1 Sense........................ 1–5

1.5.2 Isolation ...................... 1–7

1.5.3 Scanning...................... 1–8

1.6 Interlock .......................... 1–10

2 Operation 2 – 1

2.1 Navigating the front panel . . . . . . . . . . . . . . . . 2 – 2

2.1.1 Power ....................... 2–2

2.1.2 Range . . . . . . . . . . . . . . . . . . . . . . . 2 – 5

2.1.3 Select /Adjust................... 2–5

2.1.4 Numeric Entry . . . . . . . . . . . . . . . . . . 2 – 6

2.1.5 Sense........................ 2–7

2.1.6 Conﬁg . . . . . . . . . . . . . . . . . . . . . . . 2 – 7

2.1.7 Scan ........................ 2–8

2.1.8 Output....................... 2–9

2.1.9 Status . . . . . . . . . . . . . . . . . . . . . . . . 2 – 9

2.1.10 Source Out . . . . . . . . . . . . . . . . . . . . . 2 – 10

2.2 Scanning . . . . . . . . . . . . . . . . . . . . . . . . . . 2 – 11

2.2.1 Overview of scanning . . . . . . . . . . . . . . 2 – 11

2.2.2 Scan terminology . . . . . . . . . . . . . . . . . 2 – 11

2.2.3 Arming scans . . . . . . . . . . . . . . . . . . . 2 – 12

2.2.4 Triggering scans . . . . . . . . . . . . . . . . . . 2 – 13

i

ii Contents

2.2.5 TRIG In and BUSY Out . . . . . . . . . . . . . 2 – 13

2.2.6 Ending or cancelling scans . . . . . . . . . . . 2 – 14

2.3 Error messages . . . . . . . . . . . . . . . . . . . . . . 2 – 15

2.3.1 Messages at power on . . . . . . . . . . . . . . 2 – 15

2.3.2 Field calibration . . . . . . . . . . . . . . . . . . 2 – 16

2.3.3 Scanning...................... 2–16

2.3.4 Interlock...................... 2–16

2.3.5 Unexpected resets . . . . . . . . . . . . . . . . 2 – 17

3 Architecture 3 – 1

3.1 Overview.......................... 3–2

3.2 Voltage reference . . . . . . . . . . . . . . . . . . . . . 3 – 3

3.3 Digital to analog converter . . . . . . . . . . . . . . . . 3 – 3

3.4 Ampliﬁers . . . . . . . . . . . . . . . . . . . . . . . . . 3 – 4

3.4.1 High-range ampliﬁer . . . . . . . . . . . . . . . 3 – 4

3.4.2 Low-range ampliﬁer . . . . . . . . . . . . . . . 3 – 4

3.5 Remote sensing . . . . . . . . . . . . . . . . . . . . . . 3 – 4

4 Remote Operation 4 – 1

4.1 Index of commands . . . . . . . . . . . . . . . . . . . . 4 – 2

4.2 Alphabetic list of commands . . . . . . . . . . . . . . . 4 – 4

4.3 Introduction ........................ 4–6

4.3.1 Interface conﬁguration . . . . . . . . . . . . . . 4 – 6

4.3.2 Isolation and computer noise . . . . . . . . . . 4 – 6

4.3.3 Buﬀers ....................... 4–6

4.4 Commands . . . . . . . . . . . . . . . . . . . . . . . . . 4 – 7

4.4.1 Command syntax . . . . . . . . . . . . . . . . . 4 – 7

4.4.2 Notation . . . . . . . . . . . . . . . . . . . . . . 4 – 8

4.4.3 Examples ..................... 4–8

4.4.4 Conﬁguration commands . . . . . . . . . . . . 4 – 9

4.4.5 Setting commands . . . . . . . . . . . . . . . . 4 – 10

4.4.6 Scan commands . . . . . . . . . . . . . . . . . . 4 – 11

4.4.7 Setup commands . . . . . . . . . . . . . . . . . 4 – 14

4.4.8 Interface commands . . . . . . . . . . . . . . . 4 – 14

4.4.9 Status commands . . . . . . . . . . . . . . . . . 4 – 18

4.5 Statusmodel........................ 4–22

4.5.1 Status byte (SB) . . . . . . . . . . . . . . . . . . 4 – 23

4.5.2 Service request enable (SRE) . . . . . . . . . . 4 – 23

4.5.3 Standard event status (ESR) . . . . . . . . . . . 4 – 24

4.5.4 DC source status (DCCR/DCEV) . . . . . . . . 4 – 24

5 Field Calibration 5 – 1

5.1 Introduction to ﬁeld calibration . . . . . . . . . . . . . 5 – 2

DC205 Precision DC Voltage Source

Contents iii

5.2 Calibration method . . . . . . . . . . . . . . . . . . . . 5 – 2

5.3 Equipment needed . . . . . . . . . . . . . . . . . . . . 5 – 3

5.4 Detailed procedure . . . . . . . . . . . . . . . . . . . . 5 – 3

5.5 Following ﬁeld calibration . . . . . . . . . . . . . . . . 5 – 5

5.6 Restoring the factory calibration . . . . . . . . . . . . 5 – 6

6 Performance Veriﬁcation 6 – 1

6.1 Introduction to performance veriﬁcation . . . . . . . . 6 – 2

6.2 Equipment needed . . . . . . . . . . . . . . . . . . . . 6 – 2

6.3 Veriﬁcation procedure . . . . . . . . . . . . . . . . . . 6 – 2

6.4 Performance test records . . . . . . . . . . . . . . . . . 6 – 3

A Fuse and ac Line A – 1

A.1 Power Entry module . . . . . . . . . . . . . . . . . . . A – 1

A.2 ac voltage selector . . . . . . . . . . . . . . . . . . . . . A – 1

A.3 Fuse installation . . . . . . . . . . . . . . . . . . . . . . A – 3

DC205 Precision DC Voltage Source

iv Contents

DC205 Precision DC Voltage Source

General Information

Safety and Preparation for Use

Dangerous voltages, capable of causing injury or death, are

WARNING present in this instrument. These voltages can persist for many

minutes after ac power is removed. Do not remove the product

covers or panels. Do not apply power or operate the product

without all covers and panels in place.

AC line voltage

The DC205 Precision DC Voltage Source operates from a 100 V, 120 V,

220 V–230 V, or 240 V nominal ac power source having a line fre-

quency of 50 Hz or 60 Hz. Before connecting the power cord to a

power source, verify that the LINE VOLTAGE SELECTOR, located

in the rear panel power-entry module, is set so that the correct ac line

voltage value is visible. For operation with 230 V ac power, the LINE

VOLTAGE SELECTOR should be set to 220 V.

The DC205 Precision DC Voltage Source will be damaged if oper-

CAUTION ated with the LINE VOLTAGE SELECTOR set for the wrong ac line

voltage, or if the wrong fuses are installed. Verify that the correct

line fuses are installed before connecting the line cord. Use two (2)

metric size 5 ×20 mm fuses. For 100 V/120 V, use 1 A fuses; for 220 V–

230 V/240 V, use 0.5 A fuses. See appendix A for detailed instructions.

Line cord

The DC205 Precision DC Voltage Source has a detachable, three-wire

power cord for connection to the power source and to a protective

ground. The chassis of the instrument is connected to the outlet

ground to protect against electrical shock. Always use an outlet

which has a properly connected protective ground.

Service

The DC205 Precision DC Voltage Source does not have any user

serviceable parts inside. Refer service to a qualiﬁed technician.

Do not install substitute parts or perform any unauthorized modi-

ﬁcations to this instrument. Contact the factory for instructions on

how to return the instrument for authorized service and adjustment.

v

vi General Information

Symbols you may Find on SRS Products

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)

DC205 Precision DC Voltage Source

General Information vii

Notation

The following notation will be used throughout this manual.

A warning means that injury or death is possible if the instructions

WARNING are not obeyed.

A caution means that damage to the instrument or other equipment

CAUTION is possible.

Typesetting conventions used in this manual are:

•Front-panel buttons are set as [Button]

•Front-panel knobs are set as 







Knob

•Front-panel indicators are set as Overload

•Remote command names are set as *IDN?

•Literal text other than command names is set as OFF

Remote command examples will all be set in monospaced font. In

these examples, data sent by the host computer to the DC205 are set

as straight teletype font, while responses received by the host

computer from the DC205 are set as slanted teletype font.

Warnings

The DC205 is equiped with a safety interlock, which must be closed

to energize the ±100 V output range of the instrument. Details on the

safety interlock can be found in section 1.6 on page 1 – 10 .

When using banana-to-BNC adapter hardware with the DC205, the

ground tab of the adapter must be oriented to the black LO terminal,

and the black LO terminal must be grounded. This ensures that

the exposed BNC shield parts are at a safe electrical potential. Use

of banana-to-BNC adapters is not recommended when the safety

interlock is closed or the DC205 is operated on the ±100 V range.

WARNING

DC205 Precision DC Voltage Source

viii General Information

Speciﬁcations

All performance speciﬁcations after 2 hour warm-up at 23 ◦C±1◦C

ambient, unless otherwise speciﬁed.

Output

Range Full Resolution Max Time Settling

scale (1 ppm) current const.†time ‡

VµV mA µs ms

1 V ±1.010 000 1 50 160 50

10 V ±10.100 00 10 50 160 50

100 V ±101.000 0 100 25 400 100

†Time required to settle to 63 % of ﬁnal value

‡Time to settle to 99.999 % of ﬁnal value

Settling times measured for full-scale step into 10 MΩload.

Accuracy and stability

Range Accuracy Stability

(23 ◦C±1◦C) (±1◦C)

24 h 90 day∗1 year∗24 h

±( ppm setting +µV)

1 V 7 +2 12 +6 25 +10 1 +1

10 V 7 +12 12 +20 25 +20 1 +3

100 V 8 +120 12 +200 25 +200 1 +20

∗preliminary

Noise and drift

Range Temperature Noise

coeﬃcient (typical)

0◦C – 40 ◦C (0.1 – 10) Hz 10 Hz – 100 kHz

±( ppm setting +µV)/◦CµVrms

1 V 1 +1 0.5 9

10 V 1 +2 1.5 12

100 V 1 +15 12 50

DC205 Precision DC Voltage Source

General Information ix

Remote Interfaces

RS-232 DB-9 connector, baud rates 9600, 19200, 38400, 57600, and 115200

USB USB type B receptacle; serial port emulation, 115,200 baud

Optical ﬁber Connection to SX199 Optical Interface Controller. Provides

isolated connectivity to GPIB, RS-232, and Ethernet.

Interlock Two-position Euroblock-style terminal block, 0.15000 (3.81 mm),

180 ◦free hanging (in-line)

General

Parameter Speciﬁcation

Temperature 0 ◦C to 40 ◦C, non-condensing

Power <20 W, 100/120/220/240 VAC, 50/60 Hz

Dimensions 8.300 W×3.500 H×1300 D

Weight 10 lbs

Fuse two (2) metric size 5 ×20 mm

DC205 Precision DC Voltage Source

xGeneral Information

DC205 Precision DC Voltage Source

1 Getting Started

This chapter provides step-by-step instruction to get started quickly

with the DC205 Precision DC Voltage Source. Refer to chapter 2 for

a more complete introduction to the DC205.

In This Chapter

1.1 How to use this manual . . . . . . . . . . . . . . . . . 1 – 2

1.2 Preliminaries ....................... 1–2

1.2.1 Equipment needed . . . . . . . . . . . . . . . . 1 – 2

1.3 First example: turning on the instrument . . . . . . . 1 – 2

1.4 Userinterface....................... 1–4

1.5 Instrument settings . . . . . . . . . . . . . . . . . . . . 1 – 5

1.5.1 Sense........................ 1–5

1.5.2 Isolation ...................... 1–7

1.5.3 Scanning...................... 1–8

1.6 Interlock.......................... 1–10

1 – 1

1–2 Getting Started

1.1 How to use this manual

Two possible starting points are available to new users of the DC205.

Those who want to begin with an overview to the functional layout

of the instrument should turn to Chapter 2.

Users who prefer to jump in and begin using the DC205 ﬁrst should

continue with this Chapter, where a series of step-by-step procedures

are given to verify the basic performance of the instrument. This will

also provide a quick introduction to the DC205 and how it is operated.

Chapter 3 provides detailed discussions of the subsystems within

the DC205. Technical details, such as circuit topology and input

protection for remote sensing, can be found here.

Chapter 4 discusses remote operation of the DC205 over any of the

three remote interfaces: USB, RS-232, and optical ﬁber.

Chapter 5 details the procedure for adjusting the calibration of the

DC205 in the ﬁeld.

Chapter 6 give a method for verifying the output voltage accuracy

of the DC205, and contains tables to copy for recording test results.

1.2 Preliminaries

The following sections provide step-by-step instructions for verify-

ing the basic operation of the DC205. In addition to conﬁrming

proper operation, it provides a good introduction to operating the

current source.

1.2.1 Equipment needed

To perform all the steps described in this chapter, you will need:

1. a collection of stacking banana plug test leads,

2. a precision voltmeter with at least 6 digits resolution,

3. a BNC 50 Ωterminator,

4. a dual banana-to-BNC (banana-male, BNC-female) adapter.

1.3 First example: turning on the instrument

This section describes the initial steps for ﬁrst operating the DC205.

Please pay speciﬁc attention to the AC line voltage selector setting.

1. Verify the rear-panel power entry module is properly conﬁg-

ured for the line voltage in your region. Applying power

CAUTION

DC205 Precision DC Voltage Source

1.3 First example: turning on the instrument 1–3

with improper setting of the line voltage selector will result in

signiﬁcant damage to the DC205.

2. Plug the AC line cord into the rear-panel power entry module,

and then into a grounded wall outlet.

3. Using banana-plug test leads, connect the DC205 OUTPUT

terminals (HI and LO) to the voltmeter input terminals (HI and

LO). Turn on the voltmeter and set it to DCV, Autorange.

4. Restore the factory default settings by holding down the

backspace [ ] button while turning the power oﬀand on

again. This will perform the power-on reset, and return the

instrument to its factory default state. After several seconds,

the display will show , then the instrument’s

serial number, and then .

5. Key in the value 1.000000 V. Start by pressing the [1] and no-

tice the display shows the polarity indicator +and digit 1are

shown. Also, the Pending indicator begins blinking, indicating

the numeric value is awaiting entry.

6. Try pressing another digit, such as [3]. Note the value is not

added to the display, as the implied value (13) is out of range

for the current setting. Then press the decimal point button,

[.], and then press [0] three times. The display should show

and Pending should still be ﬂashing.

7. Now press the [7] digit. The display will show

. Press the [ ] button to erase the .

8. Press the [Enter/Start]. The Pending indicator should go dark,

and the display now shows . The multi-

meter should not yet show any steady reading.

9. Finally, press the OUTPUT [On/Oﬀ] button. The On indica-

tor should illuminate, and the multimeter should now show a

reading very close to +1.00000 V.

10. Allow the unit to warm up for 2 hour for full speciﬁed perfor-

mance. Warm up is not needed to test basic functionality.

DC205 Precision DC Voltage Source

1–4 Getting Started

1.4 User interface

This section explores the DC205 front-panel interface, and demon-

strates the diﬀerent methods for entering or modifying the voltage

setting.

1. If the OUTPUT is still On, turn it oﬀby pressing the [On/Oﬀ]

button.

2. Change the RANGE to ±10 V by pressing [Range] once. Set

the voltage to 0 by pressing [0] and then [Enter/Start]. Enable

the output by pressing OUTPUT [On/Oﬀ]. The display should

show .

3. Push the 







knob in, then release. least signiﬁcant digit should

begin to blink. Now slowly turn the 







knob clockwise. The

DC205 will click, and the least signiﬁcant digit (tens of micro-

volts) will begin incrementing. Continue turning the knob until

the display shows

4. Press the SELECT/ADJUST [J] button two times. Notice that

with each press, the blinking digit moves one position to the

left. Now slowly turn the 







knob for 3 more clicks clockwise.

The display should now show , and the

multimeter should show the same voltage.

5. Now clear the output setting by pressing [0] and [Enter/Start].

The display returns to , but notice the mil-

livolts digit is still blinking. Now press the [N] button three

times. The display should now show .

Turn the 







knob counterclockwise for 5 clicks. The display

should now show . and the (millivolts

position) is still blinking.

DC205 Precision DC Voltage Source

1.5 Instrument settings 1–5

6. Press the [Cancel] button—now the blinking should stop. Turn

the 







knob clockwise, without pushing it in. Note that there no

clicks, and the setting does not change.

This brief exercise demonstrated the entry modes for the DC205, in-

cluding the notion of active editing (indicated by the blinking digit),

and the use of the [Cancel] button to return to the display-idle state.

Note that the [N] and [H] buttons provide essentially the same func-

tionality as the 







knob .

1.5 Instrument settings

This section will demonstrate the basic conﬁgurations of the DC205.

1.5.1 Sense

The SENSE setting selects 2-wire or 4-wire (remote sensing) for the

voltage source circuitry.

1. If the OUTPUT On indicator is lit, disable the DC205 OUTPUT

by pressing the [On/Oﬀ] button.

2. Connect a pair of banana test leads from the red and black

SENSE terminals on the DC205 to the input HI, LOW terminals

on the multimeter.

3. Connect a second pair of banana test leads from the red and

black OUTPUT terminals on the DC205, connecting the other

end of these test leads to the back of the corresponding stack-

able sockets on the banana leads at the multimeter. Be sure to

connect HI to HI, and LOW to LOW.

4. If not already so conﬁgured, press the [Range] button repeat-

edly until the ±1 V range is selected. Press [Float/Ground] to

select Ground, and press [2 or 4 Wire] to select 2-wire.

5. Plug the banana-to-BNC adapter into the back banana leads at

the multimeter (see the following photo). Be sure to align the

Ground tab of the adapter with the LOW side banana leads.

Whenever using a banana-to-BNC adapter, the operator must

WARNING ensure that (a) the ground tab of the adapter is oriented to the

LO (black) terminal, and (b) that the LO terminal is grounded.

Failure to follow this procedure can result in hazardous volt-

ages being accessable on the outer shield of a user-provided

BNC cable or connector.

DC205 Precision DC Voltage Source

1–6 Getting Started

6. Press [1] and [Enter/Start] to program the setting to 1.000 000 V.

Press [On/Oﬀ] to enable the output. Verify the multimeter

displays a voltage very close to 1.000 000 V.

7. Use the SELECT/ADJUST buttons or the 







knob to adjust the

DC205 until the multimeter displays exactly 1.000 000 V, with a

minimum of 100 µV resolution.

8. Attach a 50 ΩBNC terminator to the banana-to-BNC adaptor.

Verify that the multimeter display drops by at least one or two

millivolts (the actual drop will depend on the length and wire

gauge of your banana test leads).

9. Now, press the [2 or 4 Wire] button. Verify that the 4-Wire

indicator and the SENSE indicator both become illuminated.

10. The multimeter should again be displaying exactly 1.000 000 V,

with a minimum of 100 µV resolution.

This exercise demonstrates the function of remote sensing in the

DC205. When operated in simple 2-wire mode, the set output voltage

is controlled internally. When a signiﬁcant load is presented (in this

case, 50 Ω), a current ﬂows from the voltage source through the circuit

created by the output leads. In this case, with 1 V across 50 Ω, a total

of 20 mA ﬂows through the output and the banana test leads. Even

10 mΩof lead resistance in this case will lead to a 200 µV potential

drop.

By enabling remote sensing in the 4-Wire mode, the DC205 controls

the potential as measured by the sense leads. By carefully arranging

the SENSE wiring to not carry any of the load current, the desired

output voltage is applied at the point of interest (in this case, at the

multimeter input terminals).

DC205 Precision DC Voltage Source

1.5 Instrument settings 1–7

1.5.2 Isolation

The CONFIG setting selects whether the output circuitry of the

DC205 is referenced to chassis ground or ﬂoating.

1. If the OUTPUT On indicator is lit, disable it by pressing the

[On/Oﬀ] button.

2. Connect a pair of banana test leads from the red and black OUT-

PUT terminals on the DC205 to the input HI, LOW terminals

on the multimeter.

3. Press the [Range] button to select ±1 V. Press the [Float/Ground]

button to select Floating. Press [1] and then [Enter/Start] to set

the display to .

4. Press the [On/Oﬀ] button to enable the output. Verify that

+1.0000 V appears on the multimeter.

5. Connect another banana test lead from the green chassis ground

terminal on the DC205 front panel to the red HI banana lead at

the DC205.

Notice that the multimeter still displays +1.0000 V, even though

the HI terminal is now connected to chassis ground. The out-

put of the DC205 is conﬁgured to ﬂoat; by grounding the HI

terminal with the banana lead, the LOW terminal is now at

−1.0000 V with respect to ground.

6. Now press the [Float/Ground] button to select Ground.

Now notice that the multimeter display has dropped to a value

near 0 V (probably a few millivolts). Also, the red Overload

indicator on the DC205 is illuminated. With the DC205 in

Ground mode, the LOW terminal is internally tied to ground.

By grounding the HI terminal, the outputs are shorted, causing

Overload to illuminate.

7. Carefully remove the grounded lead from the back of the ba-

nana cable at the HI terminal. The Overload indicator should

turn oﬀ, and the meter should measure voltage close to 1.0000 V.

DC205 Precision DC Voltage Source

1–8 Getting Started

1.5.3 Scanning

In addition to generating a stable DC voltage, the DC205 is also able

to create linear sweeps of the output voltage. This example will

demonstrate one such sweep.

1. If the OUTPUT On indicator is lit, disable it by pressing the

[On/Oﬀ] button.

2. Connect a pair of banana test leads from the red and black OUT-

PUT terminals on the DC205 to the input HI, LOW terminals

on the multimeter.

3. Press the [Range] button to select ±1 V. Press the [Float/Ground]

button to select Ground. Press the [2 or 4 Wire] button to select

2-wire.

4. Brieﬂy press the [Setup Arm] button, entering the SCAN setup

mode. The display should now show . Press [N],

changing the display to . Press [H] to return the

scan range selection to . Press [I] once.

5. The display now shows the beginning voltage for the scan,

indicated with the at the left side of the display. Key in

the value [0], [.], [1], and then press [Enter/Start]. The display

should show . Press [I] again.

6. The display now shows the ending voltage for the scan, indi-

cated with the at the left side of the display. Key in the value

[0], [.], [8], and press [Enter/Start]. The display should now

show . Press [I] again.

7. The display now shows the time duration for the scan, indi-

cated by the at the left side of the display. Key in the value

[1] [0] and press [Enter/Start], to set the scan to 10 seconds. The

display should now show . Press [I] again.

8. The display now shows the scan shape setting, indicated

by the at the left side of the display. The two

choices are (a unidirectional ramp), and

(a bidirectional ramp). Press [N] and

[H] to switch between these options. Leave the setting

at , and then press [I] again.

9. The display now shows the scan repeat mode, indicated by

the at the left side of the display. The two choices

DC205 Precision DC Voltage Source

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SRS DC205 Owner's manual

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