Keithley 2308, Руководство пользователя

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13-2 Return to Section Topics 2308-900-01 Rev. A / July 2008
Section 13: Calibration Model 2308 Portable Device Battery/Charger Simulator User’s Manual
Introduction
Use the procedures in this section to calibrate the Keithley Instruments Model 2308. These
procedures require accurate test equipment to measure precise DC voltages and currents.
Calibration can be performed either from the front panel or by sending SCPI calibration commands
over the IEEE-488 bus with the aid of a computer.
Environmental conditions
Temperature and relative humidity
Conduct the calibration procedures at an ambient temperature of 18-28°C (65-82°F) with a relative
humidity of less than 70% unless otherwise noted.
Warm-up period
Allow the Model 2308 to warm up for at least one hour before performing calibration.
If the instrument has been subjected to temperature extremes (those outside the ranges stated
above), allow additional time for the instrument’s internal temperature to stabilize. Typically, allow
one extra hour to stabilize a unit that is 10°C (18°F) outside the specified temperature range.
Allow the test equipment to warm up for the minimum time specified by the manufacturer.
Line power
The Model 2308 requires a line voltage of 100 to 240 V at line frequency of 50 or 60 Hz. The
instrument must be calibrated while operating from a line voltage within this range.
Calibration considerations
When performing the calibration procedures:
• Make sure that the test equipment is properly warmed up and connected to the appropriate
Model 2308 OUTPUT #1 or OUTPUT #2 terminals, depending on which channel you are
calibrating.
• Always allow the source signal to settle before calibrating each point.
• Do not connect test equipment to the Model 2308 through a scanner or other switching
equipment.
• Calibration must be performed in the sequence outlined in this manual or an error will occur.
• Both channels are calibrated during calibration.
• If an error occurs during calibration, the Model 2308 will generate an appropriate error
message. See Appendix B for more information.
WARNING The information in this section is intended only for qualified service
personnel. Do not attempt these procedures unless you are qualified to do
so.
WARNING The maximum common-mode voltage (voltage between LO and chassis
ground) is 22VDC. Exceeding this value may cause a breakdown in
insulation, creating a shock hazard.