Keithley 2520, Service Manual, Page: 34 / 137

2-4 Calibration Model 2520 Pulsed Laser Diode Test System Service Manual
Environmental conditions
Temperature and relative humidity
Conduct the calibration procedures at an ambient temperature of 18-28°C (65-82°F) with
relative humidity of less than 70% unless otherwise noted.
Warm-up period
Allow the Model 2520 to warm up for a minimum of 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.
Also, allow the test equipment to warm up for the minimum time specified by the
manufacturer.
Line power
The Model 2520 requires a line voltage of 100V to 240V at line frequency of 50 or 60Hz.
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
Model 2520 input or output terminals as required.
• Allow signals to settle before calibrating each point.
• Do not connect test equipment to the Model 2520 through a scanner or other
switching equipment.
• If an error occurs during calibration, the Model 2520 will generate an appropriate
error message. See Appendix B for more information.
WARNING The maximum common-mode voltage (voltage between LO and
chassis ground) is ±10V DC. Exceeding this value may cause a shock
hazard.