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Measurement Concepts
2-13
Zero check and zero correct
Table 2-3 lists the display messages associated with zero check and zero correct. The
two-character message is displayed along with the reading.
Zero check
When zero check is enabled (on), the input amplifier is reconfigured to shunt the input signal
to low as shown in Figure 2-10. With zero check enabled, it will remain enabled when a different
function is selected. With zero check disabled, it will remain disabled when the volts, amps or
coulombs function is selected.
NOTE
Zero check will always enable whenever the ohms function is selected.
Zero check is enabled by pressing the ZCHK key. Pressing ZCHK a second time disables zero
check.
NOTE
To ensure proper operation, always enable zero check before changing functions.
For coulombs, enabling zero check dissipates the charge. That is, the charge reading is reset
to zero. When zero check is disabled, a sudden change in the charge reading (zero check hop)
occurs. This effect can be cancelled by enabling Relative (REL) immediately after zero check is
disabled. Relative is explained in Section 7.
Table 2-3
Display messages for zero check and zero correct
Display
Message
Zero Check Zero Correct
ZC
On
Off
ZZ
On
On
CZ
Off
On
Summary of Contents for 6514
Page 203: ...14 CommonCommands...
Page 207: ...15 SCPISignalOriented MeasurementCommands...
Page 235: ...18 PerformanceVerification...
Page 254: ...19 Calibration...
Page 274: ...20 RoutineMaintenance...
Page 278: ...A Specifications...
Page 282: ...B StatusandErrorMessages...
Page 288: ...C GeneralMeasurement Considerations...
Page 294: ...D DDCEmulationCommands...
Page 299: ...E ExamplePrograms...
Page 306: ...F IEEE 488BusOverview...
Page 320: ...G IEEE 488andSCPI ConformanceInformation...
Page 324: ...H CalibrationOptions...