Keithley 2308 Quick Start Manual
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Keithley 2308 Quick Start Manual

Keithley 2308 Quick Start Manual

Portable device battery/charger simulator
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Model 2308 Portable Device
Battery/Charger Simulator
Quick Start Guide
2308-903-01 Rev. A / July 2008
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

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Summary of Contents for Keithley 2308

  • Page 1 Model 2308 Portable Device Battery/Charger Simulator Quick Start Guide 2308-903-01 Rev. A / July 2008 G R E A T E R M E A S U R E C O N F I D E N C E...
  • Page 2 WARRANTY Keithley Instruments, Inc. warrants this product to be free from defects in material and workmanship for a period of one (1) year from date of shipment. Keithley Instruments, Inc. warrants the following items for 90 days from the date of shipment: probes, cables, software, rechargeable batteries, diskettes, and documentation.

  • Page 3: Safety Precautions

    Keithley Instruments products are designed for use with electrical signals that are rated Measurement Category I and Measurement Category II, as described in the International Electrotechnical Commission (IEC) Standard IEC 60664. Most measurement, control, and data I/O signals are Measurement Category I and must not be directly connected to mains voltage or to voltage sources with high transient over-voltages.
  • Page 4 To maintain protection from electric shock and fire, replacement components in mains circuits - including the power transformer, test leads, and input jacks - must be purchased from Keithley Instruments. Standard fuses with applicable national safety approvals may be used if the rating and type are the same.
  • Page 5 Any unauthorized reproduction, photocopy, or use the information herein, in whole or in part, without the prior written approval of Keithley Instruments, Inc. is strictly prohibited. TSP, TSP-Link, and TSP-Net are trademarks of Keithley Instruments, Inc. All other brand names are trademarks or registered trademarks of their respective holders.

  • Page 6: Table Of Contents

    Table of Contents Title Page Introduction ....................1-1 Performance features................1-1 Proper supply connections to the DUT ............1-2 Front-panel operation ................. 1-7 Menu controls..................1-7 Setting the output voltage, current limit, and current range....1-7 Turning supply output ON/OFF ............
  • Page 7 Figure Title Page Figure 1 Model 2308 front panel ................. 1 Figure 2 Rear-panel view of Model 2308 ..............3 Figure 3 Battery channel preferred connection (maximum stability) ......4 Figure 4 Battery channel fastest transient response connection ....... 5...

  • Page 8: Introduction

    POWER Performance features • The Model 2308 is a specialized power supply that has a very fast recovery to large, near instantaneous load current transitions. Conventional power supplies do not have this capability. The Model 2308 is designed specifically to respond to large load changes and very short pulsed loads with small transient voltage drop and a very fast recovery time.

  • Page 9: Proper Supply Connections To The Dut

    μ sec. • The Model 2308 can simulate the output of a battery. Its programmable output resistance can simulate a battery’s internal resistance so that the voltage output looks like that of a battery’s output. •...

  • Page 10: Figure 2 Rear-Panel View Of Model 2308

    Figure Figure 4, and Figure Figure 2 Rear-panel view of Model 2308 WARNING: NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY. OUTPUT #2 OUTPUT #1 ISOLATION FROM EARTH: 22 VOLTS MAX MAX.

  • Page 11: Figure 3 Battery Channel Preferred Connection (Maximum Stability)

    Proper supply connections to the DUT Figure 3 Battery channel preferred connection (maximum stability) Twist source leads together and twist sense leads together for NOTE optimum performance. The analog outputs provide a voltage output based on the measured current as follows: 0.5/5 A Output referenced to Source - : 1 A/V (each volt out represents 1A) 5/50 mA Output referenced to Source - : 10 mA/V (each volt out...

  • Page 12: Figure 4 Battery Channel Fastest Transient Response Connection

    Proper supply connections to the DUT Figure 4 Battery channel fastest transient response connection Twist source leads together and twist sense leads together for NOTE optimum performance. The analog outputs provide a voltage output based on the measured current as follows: 0.5/5 A Output referenced to Source - : 1 A/V (each volt out represents 1A) 5/50 mA Output referenced to Source - : 10 mA/V (each volt out...

  • Page 13: Figure 5 Charger Channel 4-Wire Remote Sense Connection Of The Dut To The Output

    Proper supply connections to the DUT Figure 5 Charger channel 4-wire remote sense connection of the DUT to the output Twist Source leads together and twist Sense leads together for NOTE optimum performance.

  • Page 14: Front-Panel Operation

    Front-panel operation Front-panel operation Menu controls • Press the MENU key to activate the main menu. • Use the keys to scroll through the primary menu items. ▲ ▼ • Changing channels: when the main menu is displayed, use the keys to change the active channel (each press of the keys will toggle...

  • Page 15: And I Display Modes (Single And Dual)

    Front-panel operation V and I display modes (Single and Dual) Measured output voltages and currents are displayed with the Single or Dual V and I display modes selected. These display modes are selected as follows: NOTE To display measured readings if the instrument is in the settings mode, press the SET key until the blinking stops (the measured readings can then be displayed).

  • Page 16: Average Readings

    Front-panel operation is 16.67msec. In general, the fastest integration time (0.002 PLC) results in increased reading noise. The slowest integration time (10 PLC) provides the best common-mode and normal-mode rejection. In between settings are a compromise between speed and noise. The NPLC RATE #2 item of the menu is also used to set the reading rate for DVM measurements on the charger channel.
  • Page 17 Front-panel operation READ? ‘ Trigger 5 current measurement conversions and return the average of those 5 conversions. The average of the 5 readings is displayed on the front panel. Charger channel (#2) SOUR2:VOLT 5 ‘ Set output voltage to 5 V. SENS2:CURR:RANG:AUTO ON ‘...

  • Page 18: Dvm Input Mode (Channel 2 Only)

    Front-panel operation Figure 6 Charger Control Circuit Testing For Channel 1 to simulate a discharged battery (by sinking NOTE current) and for Channel 2 to simulate a charger, program the Channel 2 voltage to be greater than the Channel 1 voltage. DVM input mode (Channel 2 Only) The DVM input display mode must be selected in order to measure voltage applied to the DVM input of the power supply.

  • Page 19: The Dvm

    Model 2308 Instruction Manual, Section 3, Pulse Current Measurements. The pulse measurement period can be selected manually or be automatically set by the Model 2308. First, the user must specify a trigger level that serves as a...

  • Page 20: Figure 7 Pulsed Waveform

    Once the trigger level is selected, the output is turned on and the pulsed load measurement is operational, the 2308 can be prompted to automatically determine the high time, low time, and average time...

  • Page 21: Figure 8 Eliminating The Effect Of A Current Transient On A Pulse Current Measurement

    Front-panel operation Figure 8 Eliminating the effect of a current transient on a pulse current measurement 8, a trigger delay of 100 μs is used to eliminate the NOTE Figure effect of a current transient on the pulse current measurement. Front-panel operation for performing pulse current measurements All of the following settings are available in submenus of PULSE CURRENT #1/#2...
  • Page 22 Front-panel operation Set trigger level and range TRIGGER LEVEL - For the battery channel (#1), use to specify the trigger level for the 5 A, 500 mA, 50 mA, or 5 mA current ranges. Pulse current only works on the 5 A current range for the charger channel.
  • Page 23 Press ENTER when ACQUIRE TIMES appears on the display. If the correct trigger level is selected in the previous step and the DUT is operating, the Model 2308 will automatically determine the HIGH, LOW, and AVERAGE times. If the trigger level is incorrect or the DUT is not functioning properly, the message PULSE CURR TRIG NOT DETECTED will be displayed.
  • Page 24 Front-panel operation Pulse current display mode Pulse current measurements are displayed with the pulse current display mode selected. This display mode is selected as follows: To display measured readings if the instrument is in the settings NOTE mode, press the SET key until the blinking stops (the measured readings can then be displayed).
  • Page 25 DUT. The waveform information is very useful in setting up the Model 2308, reducing setup time, and achieving maximum performance and productivity. The voltage and current characteristics of the DUT...

  • Page 26: Figure 9 Determining Voltage And Current Characteristics For Battery Channel

    Front-panel operation Figure 9 Determining voltage and current characteristics for battery channel Figure 9 contains a simple circuit for determining the dynamic NOTE voltage and current characteristics of the DUT.
  • Page 27 Front-panel operation Programming examples: pulse current measurements The following command sequence will return the average of 10 peak pulse current measurements: Battery channel (#1) SENS:RANG 5 ‘ Select 5 A range. VOLT 15 ‘ Set output voltage to 15 V. CURR 0.75 ‘...

  • Page 28: Long Integration Mode

    850 ms to 60 sec set in 1msec increments. The Model 2308 can determine the integration time automatically or the user can set the integration time manually from the front panel.
  • Page 29 Front-panel operation Turn on the output Press the OPERATE key after setting the appropriate voltage and current limits for the DUT. Select the current range Select appropriate range: battery channel (#1) = 5 A, 500 mA, 50 mA, or 5 mA charger channel (#2) = 5 A Set trigger level TRIGGER LEVEL submenu...
  • Page 30 If the correct trigger level is selected in the previous step and the DUT is operating, the Model 2308 will automatically determine the INTEGRATION times. If the trigger level is incorrect or the DUT is not functioning properly, the message LONG INT TRIG NOT DETECTED will be displayed.
  • Page 31 Front-panel operation This display mode is selected as follows: 1. Press the DISPLAY key to access the display menu. 2. Press the keys to scroll to DISPLAY TYPE #1 or DISPLAY TYPE #2. 3. Press the keys to scroll to LONG INTEGRATION. ▲...
  • Page 32 Front-panel operation READ? ‘ Trigger and return one reading and reading shown on display. Charger channel (#2) SENS2:RANG 5 ‘ Select 5 A range. SOUR2:VOLT 15 ‘ Set output voltage to 15 V. SOUR2:CURR 0.75 ‘ Set current limit to 750 mA. OUTP2 ON ‘...

  • Page 33: Variable Output Impedance Control On Battery Channel

    Variable output impedance control on Battery Channel (#1) Variable output impedance control on battery channel The Model 2308 battery channel (#1) has a variable output impedance control that can be used to simulate the impedance of a battery pack. To manually set the output impedance: 1.

  • Page 34: Variable Output Bandwidth

    Variable output impedance control on Battery Channel (#1) Variable output bandwidth For high impedance test lead - DUT circuits, Model 2308 channel’s output could become unstable. To improve stability, the channel’s output bandwidth can be reduced. This action reduces voltage transient response, but the output becomes more stable for a wider range of load impedances.

  • Page 35: Advanced Features

    Variable output impedance control on Battery Channel (#1) Advanced features Analog output There are two analog output terminals: a 0.5/5 A output terminal for use when the battery channel is programmed for either the 5 A or the 500 mA range and a 5/ 50 mA output terminal for use when the battery channel is programmed for either the 50 mA or the 5 mA range.

  • Page 36: Optimizing Measurement Speed

    Variable output impedance control on Battery Channel (#1) Optimizing measurement speed Auto Zero State In general, to optimize speed of any application code, you should turn auto zero off. To turn auto zero off, use the AUTO ZERO STATE option under the Main Menu or send the following command over the bus: SYSTem : AZERo:STATe 0 The system auto zero state setting indicates whether background readings are...
  • Page 37 Variable output impedance control on Battery Channel (#1) read:five? ' switch to the 5mA current range, trigger a current reading and return it To optimize speed, the read:five? command combines range NOTE changing, triggering a DC current measurement, and taking a reading.

  • Page 38: Turning Supply Output On/Off V And I Display Modes (Single And Dual)

    Index Variable output bandwidth Front-panel operation for output bandwidth Variable output impedance control on Advanced features battery channel Analog output Optimizing measurement speed Auto Zero State Programming examples DVM input mode Front panel Operation operation for output bandwidth operation for performing long integration measurements operation for performing pulse current measurements...
  • Page 39 Service Form Model No. Serial No. Date Name and Telephone No. Company List all control settings, describe problem and check boxes that apply to problem. ❏ ❏ ❏ Intermittent Analog output follows display Particular range or function bad; specify ❏ ❏...
  • Page 40 M E A S U R E C O N F I D E N C E Keithley Instruments, Inc. Corporate Headquarters • 28775 Aurora Road • Cleveland, Ohio 44139 • 440-248-0400 • Fax: 440-248-6168 • 1-888-KEITHLEY • www.keithley.com 12/06...

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