4
Performance Verification Tests
56
Keysight 3458A Calibration Manual
number of connections: use the same type of metal for all connections;
minimize the temperature variations across the measurement wiring: try to
keep the multimeter and the wiring at the same temperature: and avoid
high-temperature environments whenever possible.
– Electromagnetic Interference (EMI): This type of interference is generally
caused by magnetic fields or high levels of radio frequency (RF) energy.
Magnetic fields can surround all types of equipment operating off of AC line
power, especially electric motors. RF energy from nearby radio or television
stations or communications equipment can also be a problem. Use shielded
wiring whenever the measurement setup is in the presence of high EMI. If
possible, move farther away or turn off sources of high EMI. It may be
necessary to test in a shielded room.
– Ground Loops: Ground loops arise when the multimeter and the circuit under
test are grounded at physically different points. A typical example of this is
when a number of instruments are plugged into a power strip in an equipment
rack. If there is a potential difference between the ground points, a current will
flow through this ground loop. This generates an unwanted voltage in series
with the circuit under test. To eliminate ground loops, ground all equipment/
circuits at the same physical point.
– Internal Temperature: The internal temperature of the 3458A under test must
be within 5
°
C of its temperature when last adjusted. If the multimeter's
temperature is not within 5
°
C first check the multimeter's fan operation and
clean the filter. Also, make sure that you adjust the operating environment
such that the ambient temperature is at or very near 25
°
C. You will achieve the
best results if you maintain your environment close to 25
°
C. If you choose to
verify performance when the temperature is not within 5
°
C, you must
recalculate all test limits based on the temperature variation beyond the 5
°
C
limitation. The published test limits were calculated without additional
temperature coefficient errors added.
Содержание 3458A
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Страница 109: ...Command Summary 5 Keysight 3458A Calibration Manual 109 Related commands ACAL CAL SECURE ...
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