Stanford Research Systems DC205 Operation And Service Manual
Operation and Service Manual
Precision DC Voltage Source
DC205
Stanford Research Systems
Revision 0.30 • February 22, 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 workmanship 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.
Copyrightc Stanford Research Systems, Inc., 2019. All rights reserved.
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: info@thinkSRS.com
Printed in U.S.A. Document number 9-01745-903
DC205 Precision DC Voltage Source
Contents
General Information iii
Safety and Preparation for Use ................ iii
Symbols ............................. iv
Notation ............................. v
Specifications .......................... vi
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 ...................... 1–6
1.5.3 Scanning ...................... 1–7
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 ....................... 2–4
2.1.3 Select / Adjust ................... 2–4
2.1.4 Numeric Entry .................. 2–5
2.1.5 Sense ........................ 2–6
2.1.6 Config ....................... 2–6
2.1.7 Scan ........................ 2–7
2.1.8 Output ....................... 2–7
2.1.9 Status ........................ 2–8
2.1.10 Source Out ..................... 2–8
2.2 Theory of operation .................... 2–10
2.3 Scanning .......................... 2–10
2.4 Error messages ...................... 2–10
3 Remote Operation 3 – 1
3.1 Index of commands .................... 3–2
3.2 Alphabetic list of commands ............... 3–4
i
ii Contents
3.3 Introduction ........................ 3–6
3.3.1 Interface configuration .............. 3–6
3.3.2 Buffers ....................... 3–6
3.4 Commands ......................... 3–7
3.4.1 Command syntax ................. 3–7
3.4.2 Notation ...................... 3–8
3.4.3 Examples ..................... 3–8
3.4.4 Configuration commands ............ 3–9
3.4.5 Setting commands ................ 3–10
3.4.6 Scan commands .................. 3–10
3.4.7 Setup commands ................. 3–13
3.4.8 Interface commands ............... 3–13
3.4.9 Status commands ................. 3–15
3.5 Status model ........................ 3–18
3.5.1 Status byte (SB) .................. 3–18
3.5.2 Service request enable (SRE) .......... 3–19
3.5.3 Standard event status (ESR) ........... 3–19
4 Field Calibration 4 – 1
4.1 Introduction to Field Calibration ............ 4–2
4.2 Equipment needed .................... 4–2
4.3 Detailed procedure .................... 4–2
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
General Information
Safety and Preparation for Use
WARNING
AC line voltage
CAUTION
Line cord
Dangerous voltages, capable of causing injury or death, are
present in this instrument. Do not remove the product covers
or panels. Do not apply power or operate the product without
all covers and panels in place.
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 frequency 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 operated 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.
Service
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.
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 modifications to this instrument. Contact the factory for instructions on
how to return the instrument for authorized service and adjustment.
iii
iv 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 v
Notation
The following notation will be used throughout this manual.
WARNING
CAUTION
A warning means that injury or death is possible if the instructions
are not obeyed.
A caution means that damage to the instrument or other equipment
is possible.
Typesetting conventions used in this manual are:
• Front-panel buttons are set as [Button]
Knob
• Front-panel knobs are set as
• 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.
DC205 Precision DC Voltage Source
vi General Information
Specifications
All performance specifications after 2 hour warm-up at 23◦C ±1◦C
ambient, unless otherwise specified.
Output
Accuracy and stability
Range
Full Resolution Max Time Settling
scale (1 ppm) current const.
†
V μV mA μs ms
1V ±1.010 000 1 50 160 50
10 V
100 V
±10.100 00 10 50 160 50
±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 MΩ load.
Range
Accuracy Stability
(23◦C ±5◦C) (±1◦C)
24 h 90 day∗1 year
∗
24 h
±( ppm setting + μV)
1V 7 + 2 12 + 6 25 + 10 1 + 1
10 V
100 V
7 + 6 12 + 15 25 + 20 1 + 3
8 + 60 12 + 80 25 + 100 1 + 20
∗
preliminary
time
‡
Noise and drift
Range
Temperature Noise
coefficient (typical)
0◦C–40◦C (0.1 – 10) Hz 10 Hz – 100 kHz
±( ppm setting + μV)/◦C μVrms
1V 1 + 1 0.5 9
10 V
100 V
1 + 2 1.5 12
1 + 15 12 50
DC205 Precision DC Voltage Source
General Information vii
Remote Interfaces
General
RS-232
DB-9 connector, 9600 baud
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.
Parameter
Specification
Temperature 0◦Cto40◦C, non-condensing
Power < 20 W, 100/120/220/240 VAC, 50/60 Hz
Dimensions 8.3W × 3.5H × 13D
Weight 10 lbs
Fuse two (2) metric size 5 × 20 mm
DC205 Precision DC Voltage Source
viii General Information
DC205 Precision DC Voltage Source
1 Getting Started
In This Chapter
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.
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 ...................... 1–6
1.5.3 Scanning ...................... 1–7
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 providea quick introductionto the DC205and how it isoperated.
Chapter 3 discusses remote operation of the DC205 over any of the
three remote interfaces: USB, RS-232, and optical fiber.
1.2 Preliminaries
The following sections provide step-by-step instructions for verifying 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 Ω terminator,
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. Before using the instrument, verify the rear-panel power entry
module is properly configured for the power line voltage in
CAUTION
your region. Applying power 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.
DC205 Precision DC Voltage Source
1.3 First example: turning on the instrument 1–3
4. Restore the factory default settings by pressing the POWER [ ]
while holding the BACKSPACE [
] button depressed. This
will perform the power-on reset, clear any field calibration
data, and return the instrument to its factory default state.
After several seconds, the display will show
and then
.
5. Key in the value 1.000000 V. Start by pressing the [1] and notice the display shows the polarity indicator + and digit 1 are
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
. We don’t actually want that last digit, so
now 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 indicator should illuminate, and the multimeter should now show a
reading very close to +1.00000 V.
,
DC205 Precision DC Voltage Source
10. Allow the unit to warm up for 2 hour for full specified performance. Warm up is not needed to test basic functionality.
1–4 Getting Started
1.4 User interface
This section explores the DC205 front-panel interface, and demonstrates the different methods for entering or modifying the voltage
setting.
1. If the OUTPUT is still On, turn it off by pressing the [On/Off]
button.
2. Change the RANGE to ±10V 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
knob inwards. The least significant digit should
3. Press the
begin to blink. Now slowly turn the
.
knob clockwise. The
DC205 should click, and the least significant digit (tens of microvolts) begin incrementing. Continue turning the knob until
the display shows
4. Press the SELECT/ADJUST [] button two times. Notice that
with each press, the blinking digit moves one position to the
left. Now slowly turn the
The display should now show
knob for 3 more clicks clockwise.
, 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 [] button three
times. The display should now show
Turn the
should now show
knob counterclockwise for 5 clicks. The display
. and the (millivolts
position) is still blinking.
.
6. Press the [Cancel] button—now the blinking should stop. Carefully turn the
knob clockwise without depressing the shaft.
Note that there no clicks, and the setting does not change.
This brief exercise demonstrated the entry modes for the DC205, including 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 [] and [] buttons provide essentially the same func-
tionality as the
knob .
DC205 Precision DC Voltage Source
1.5 Instrument settings 1–5
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 stackable sockets on the banana leads at the multimeter. Be sure to
connect HI to HI, and LOW to LOW.
4. Plug the banana-to-BNC adapter into the back banana leads at
the multimeter. Be sure to align the Ground tab of the adapter
with the LOW side banana leads.
5. If not already so configured, press the [Range] button repeatedly until the ±1V range is selected. Press [Float/Ground] to
select Ground, and press [2 or 4 Wire] to select 2-wire.
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.
knob to adjust the
7. Use the SELECT/ADJUST buttons or the
DC205 until the multimeter displays exactly 1.000 000 V, with a
minimum of 100 μV resolution.
8. Attach the 50 Ω BNC 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.
DC205 Precision DC Voltage Source
1–6 Getting Started
This exercise demonstrated the function of remote sensing in the
DC205. When operated in simple 2-wire mode, the commanded
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 relays and
the banana test leads. Even 10 mΩ of lead resistance in this case will
lead to a 200 μV potential drop.
1.5.2 Isolation
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).
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 OUTPUT terminals on the DC205 to the input HI, LOW terminals
on the multimeter.
3. Press the [Range] buttonto select ±1V. 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 to the green chassis ground
terminal on the DC205 front panel. Connect the second end of
DC205 Precision DC Voltage Source
1.5 Instrument settings 1–7
the test lead to the back of 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 output 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 had 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 to with the third banana lead, we
are shorting the output. This causes the Overload to illuminate.
7. Carefully remove the third banana lead from the back of the
banana cable at the HI terminal. The Overload indicator should
turn off, and the multimeter again should display very close to
1.0000 V.
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 OUTPUT terminals on the DC205 to the input HI, LOW terminals
on the multimeter.
3. Press the [Range] buttonto select ±1V. 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
changing the display to
scan range selection to
. Press [] once.
. Press [] to return the
. Press [],
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
DC205 Precision DC Voltage Source
should show
. Press [] again.
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