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Model 6487 Reference Manual Measurements and Sourcing Voltage 3-25

Figure 3-8

A-V ohms reading recall sequence

Operating considerations

Range

Auto range cannot be used with A-V ohms. Auto range will be automatically disabled

when arming A-V ohms from the front panel. Over the GPIB, however, sending the

CURR:OHMS:AVOL:ARM command with auto range on will result in error +852 “No

A-V ohms with Autorange”. Also, only the following ranges can be used: 20nA, 2µA,

200µA, and 20mA. If on any other range, the unit will uprange to the closest allowed range.

Filtering

The median and average filters are not used in the A-V ohms mode. Once the A-V ohms

process is complete, the state of the filters will be restored.

Rate and autozero

During A-V ohms, integration rates are restricted to either 0.02 PLC, 0.1 PLC, 1 PLC, 6 PLC,

or 60 PLC. Autozero is turned off but restored after completion if it was previously on. If the

integration rate is set to any other value, it will be set to the closest of these settings. However,

the original integration rate will not be restored at the conclusion of the A-V ohms cycle.

Integration times of 0.02 PLC and 0.1 PLC will automatically cause the display to be dis-

abled during the A-V ohms run. After the desired number of cycles has completed (or an

OHMS:AVOL:ABORt command is received), the display will be restored.

RANGE

RDG NO. 10