Front Panel Operation
Connecting Sources to the Product 4
4-9
Table 4-4. Input Impedance Summary
Input Range Inputs 1 and 2 Wideband Input
1000 V 500 kΩ N/A
700 V 500 kΩ N/A
220 V 50 kΩ N/A
70 V 50 kΩ N/A
22 V 50 kΩ N/A
7 V 50 kΩ 50 Ω
2.2 V 10 MΩ 50 Ω
700 mV 10 MΩ 50 Ω
220 mV 10 MΩ 50 Ω
70 mV 10 MΩ 50 Ω
22 mV 10 MΩ 50 Ω
7 mV 10 MΩ 50 Ω
2.2 mV 10 MΩ 50 Ω
Connecting the Guard and Ground Binding Posts
Note
The following information applies to INPUT 1, INPUT 2, and the AUX
input only. It does not apply to the WIDEBAND input. Once you
connect a coaxial cable to the Wideband option, no other
connections are required.
Ground currents can occur if instruments are not connected properly, resulting in
often subtle measurement errors. In any system of measurement instruments,
the basic rule is that all instruments should be grounded at a single common
point. If an instrument in the system has a grounded input or output, select it as
the common earth ground point for all the grounds in the system. Otherwise, use
the ac voltage source used in the system (if there is one) as the common ground
point for all the instruments.
For more information about grounding and guarding, refer to Grounding and
Shielding Techniques in Instrumentation, by Ralph Morrison, fifth edition 2007,
John Wiley & Sons.
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