Stanford Research Systems SR785, Operating Manual And Programming Reference

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Input Configuration Menu 4-89
SR785 Dynamic Signal Anaylzer
Input Configuration Submenu
Channel
Selects which input channels will be affected by the input configuration submenu [Ch1,
Ch2, Both]. When Ch1 is selected, items on the menu will display and change
parameters for the Ch1 input. When Ch2 is selected, items on the menu will display and
change parameters for the Ch2 input. When Both is selected, the menu will display
parameters for the Ch1 input but any changes made will affect both inputs.
Input Mode
Select the Input Mode for the selected input[A (single-ended), A-B (differential)]. The
Input indicator shows the current mode at the top of the screen.
In general, when looking at very small signals, connect A to the signal source and B to
the signal ground and use A-B. In this case, make sure that the two input cables do not
encompass any loop area (twist them together or run them side by side).
Command: I1MD (?) {i}
Command: I2MD (?) {i}
Grounding
Select the Input Grounding for the selected input shields [Float, Ground].
The shields of A and B are connected.
Float connects the shields to chassis ground through 1 M
Ω
+ 0.01
µ
F. This allows the
shield of a single ended input to ‘float’.