Keithley 2303, Руководство по обслуживанию, Страница: 27 / 104

2-2 Calibration
Introduction
Use the procedures in this section to calibrate the Model 2303, 2303B, or 2303-PJ. These pro-
cedures require accurate test equipment to measure precise DC voltages and currents. Calibra-
tion can be performed either from the front panel (Models 2303 and 2303-PJ only), or by
sending SCPI calibration commands over the IEEE-488 bus with the aid of a computer (Models
2303, 2303B, and 2303-PJ).
WARNING
The information in this section is intended only for qualified service person-
nel. Do not attempt these procedures unless you are qualified to do so.
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 2303 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.
Also, allow the test equipment to warm up for the minimum time specified by the
manufacturer.
Line power
The Model 2303 requires a line voltage of 100 to 240V at line frequency of 50 to 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 appropri-
ate Model 2303 terminals.
• Always allow the source signal to settle before calibrating each point.
• Do not connect test equipment to the Model 2303 through a scanner or other switching
equipment.
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