Keithley 2260B Series User manual

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2260B Series
www.keithley.com
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Verification Procedure
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A Tektronix Company
A G R E A T E R M E A S U R E O F C O N F I D E N C E
Multi-Range
Programming DC Power Supplies
077-1048-01/ August2015

Series 2260B
Multi-Range Programmable DC Power Supplies
VERIFICATION PROCEDURE
ISO-9001 CERTIFIED MANUFACTURER

This manual contains proprietary information, which is protected by copyright. All rights are reserved.
No part of this manual may be photocopied, reproduced or translated to another language without
prior written consent of Keithley company.
The information in this manual was correct at the time of printing. However, Keithley continues to
improve products and reserves the rights to change specification, equipment, and maintenance
procedures at any time without notice.

Table of Contents
1
Table of Contents
Preparing for Verification ....................................................... 2
List of Equipment for Verification ............................................ 3
Constant Voltage Tests .......................................................... 4
Voltage Programming and Measurement Accuracy .............................................. 4
CV Load Regulation ............................................................................................. 5
CV Line Regulation .............................................................................................. 6
CV Ripple and Noise ............................................................................................ 7
Transient Recovery Time ..................................................................................... 8
Constant Current Tests ........................................................ 10
Current Programming and Measurement Accuracy ............................................ 10
CC Load Regulation ........................................................................................... 11
CC Line Regulation ............................................................................................ 12
Verification Test Record Form ............................................... 13
30V ................................................................................................................... 13
80V ................................................................................................................... 15
250V ................................................................................................................. 17
800V ................................................................................................................. 19

2260B Verification Procedure
2
Preparing for Verification
Note
In order to ensure performance accuracy, we recommend
you to verify all items listed in this chapter at once.
When to verify the
specification
When using the power supply in a new environment
After replacing one of the major internal modules, such
as front panel or power supply PCB
When you need to make sure that the power supply is
malfunctioning or not
Verification
Environment
Location: Indoor, no direct sunlight, dust free
Relative Humidity: < 80%
Temperature: +18~+28°C
Warm-up time: ≥ 30 minutes
When the
verification fails…
Calibrate the instrument when a corresponding
calibration item exists.
For other items, send the power supply back to the
factory for repair.

List of Equipment for Verification
3
List of Equipment for Verification
Here is the list of all equipment used in the service operations.
Type
Specifications
Recommended Model
Digital Voltmeter
Resolution: 1 uV @ 1V
Keithley Model
2000 or equivalent
Readout: 6 1/2 digits
Current Shunt
3A (0.1Ω) 0.02%, TC=10ppm/℃
30A (0.01Ω) 0.02%, TC=10ppm/℃
300A (0.001Ω) 0.02%,
TC=10ppm/℃
Oscilloscope
Sensitivity: 1 mV
Bandwidth Limit: 20 MHz
Probe: 1:1 with JEITA RC-9131B
Tektronix
DPO4014B or
equivalent
AC Power Source
Adjustable to highest rated input
voltage range.
Power: 3000 VA
Ametek 3001i or
equivalent
Electronic Load
60V, 240A minimum, with transient
capability and a slew rate of 1A/us
or better.
Ametek SLH, SLM
or PLA series
electronic loads or
equivalent
500V, 60A minimum, with transient
capability and a slew rate of
0.4A/us or better
1000V, 12A minimum, with
transient capability and a slew rate
of 0.2A/us or better

2260B Verification Procedure
4
Constant Voltage Tests
Voltage Programming and Measurement Accuracy
Connection
Fig. 1
L
N
G
AC Power Source 2260B
L
N
＋
－
＋
－
V
Precision
Current Shunt
A
＋
－
+V
-V
+S
-S
Background
This test verifies that the voltage programming and
measurement functions are within specifications.
Procedure
1. Turn off the power supply and connect the DVM from
the PCS-1000 directly across the +S and -S terminals as
shown in the fig. 1 connection.
2. Turn on the power supply and program the output
voltage to zero and the output current to its maximum
programmable value (Imax) with the load off. The CV
indicator should be on and the output current reading
should be approximately zero.
3. Record the output voltage readings on the digital
voltmeter (DVM) and the voltage measured over the
interface. The readings should be within the limits
specified in the test record form for the appropriate
model under Voltage Programming and Measurement,
Minimum Voltage Vout.
4. Program the output voltage to its full-scale rating.
5. Record the output voltage readings on the DVM and
the voltage measured over the interface. The readings
should be within the limits specified in the test record
form for the appropriate model under Voltage
Programming and Measurement, Rated Voltage Vout.
Verifying Voltage Programming and Measurement Accuracy is complete

Constant Voltage Tests
5
CV Load Regulation
Connection
Fig.2
L
N
G
AC Power Source 2260B
L
N
＋
－
＋
－
VElectronic DC Load
Precision
Current Shunt
A
＋
－
+V
-V
+S
-S
Background
This test measures the change in output voltage resulting
from a change in output current from full load to no load.
Procedure
1. Turn off the power supply and connect the DVM from
the PCS-1000 and an electronic load as shown in the fig.
2 connection.
2. Turn on the power supply and program the output
current to its maximum programmable value (Imax)
and the output voltage to its full scale value.
3. Set the electronic load for the output's full-scale
current. The CV indicator on the front panel must be
on. If it is not, adjust the load so that the output current
drops slightly.
4. Record the output voltage reading from the DVM.
5. Open the load and record the voltage reading from the
DVM again. The difference between the DVM readings
in steps 4 and 5 is the load effect, which should not
exceed the value listed in the test record form for the
appropriate model under CV Load Regulation.
Verifying CV Load Regulation is complete

2260B Verification Procedure
6
CV Line Regulation
Connection
Fig. 3
L
N
G
AC Power Source 2260B
L
N
＋
－
＋
－
VElectronic DC Load
Precision
Current Shunt
A
＋
－
+V
-V
+S
-S
Background
This test measures the change in output voltage that
results from a change in AC line voltage from the
minimum to maximum value within the line voltage
specifications.
Procedure
1. Turn off the power supply and connect the ac power
source.
2. Connect the DVM from the PCS-1000 and an electronic
load as shown in the fig. 3 connection. Set the variable
ac voltage to nominal line voltage.
3. Turn on the power supply and program the output
current to its maximum programmable value (Imax)
and the output voltage to its full-scale value.
4. Set the electronic load for the output's full-scale
current. The CV indicator on the front panel must be
on. If it is not, adjust the load so that the output current
drops slightly.
5. Adjust the ac power source to the low-line voltage (85
VAC for 100/120 nominal line; 170 VAC for 200/240
nominal line).
6. Record the output voltage reading from the DVM.
7. Adjust the ac power source to the high-line voltage (132
VAC for 100/120 nominal line; 265 VAC for 200/240
nominal line).
8. Record the output voltage reading on the DVM. The
difference between the DVM reading in steps 5 and 7 is
the source effect, which should not exceed the value
listed in the test record form for the appropriate model
under CV Line Regulation.
Verifying CV Line Regulation is complete

Constant Voltage Tests
7
CV Ripple and Noise
Connection
Fig. 4
L
N
G
AC Power Source 2260B
L
N
＋
－
＋
－
Electronic DC Load
＋
－
50 Ohm
4700pF
Scope
BW: 20MHz
1:1 50 Ohm probe
+V
-V
+S
-S
Connection
Fig. 5
L
N
G
AC Power Source 2260B
L
N
＋
－
Electronic DC Load
Scope
BW: 10MHz
V
Low Pass Filter
BW: 1MHz
＋
－
＋
－
+V
-V
+S
-S
Background
Measure the DC output voltage with the (1:1) probe on.
Measurement frequency bandwidth is 10Hz to 20MHz for
peak to peak. Measurement frequency bandwidth is 5Hz
to 1MHz for rms.
Procedure
1. Turn off the power supply and connect the electronic
load (or load resistor), probe, and an oscilloscope (ac
coupled) to the output as shown in the fig. 4
connection.
2. Set the oscilloscope's bandwidth limit on 20 MHz, and
set the sampling mode.
3. Program the power supply to output current to its
maximum programmable value (Imax) and the output
voltage to its full-scale value and enable the output. Let
the oscilloscope run for a few seconds to generate
enough measurement points. The result should not
exceed the peak-to-peak limits the test record.
4. Use the oscilloscope to measure the RMS noise voltage
using the bandwidth shown in fig. 5. The result should
not exceed the rms limits in the test record form for the
appropriate model under CV Ripple and Noise - rms.