2-12
Operation
Using Probes with an Agilent 83491A
To compensate for other devices The information in this section applies to both optical and electrical measure-
ments. Since the mainframe’s CAL signal is a voltage source, it cannot be used
to calibrate to the probe tip when the units are set to Ampere, Watt, or
Unknown. Instead, set the external gain and external offset to compensate for
the actual characteristics of the device. If you do not know the actual charac-
teristics, you can refer to the typical specifications that came with the device.
1Press the reference receiver module’s front-panel channel SETUP key.
2Press External scale.
3Press Atten units Ratio, Attenuation 1:1, and then Units Ampere (Volt, Watt, or
Unknown).
4Press Ext gain, and enter the actual gain characteristics of the device.
5Press Ext offset, and enter the offset introduced by the device.