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Model 6517B Electrometer Reference Manual
Section 10: Limits, digital I/O, and scanning
Setting limits
Limits are controlled with the LIMIT-SET-1 and LIMIT-SET-2 selections. These menu items are similar
in that you can enable or disable either or both limit sets, and program the high and low limit values
for either or both limit sets.
The options for these menu items are explained as follows:
CONTROL: This enables or disables control of the digital output lines by the results of either or both
limit set tests. For example, to let limit set #1 control the digital output lines, highlight the CONTROL
item in the previous menu and press ENTER. Then highlight the ENABLE item in the next menu and
press ENTER. The instrument returns to the LIMIT SET #1 MENU.
LOLIM1, HILIM1, LOLIM2, HILIM2: These items allow you to set values for the low and high limits,
and the action performed on the digital output lines for each limit test failure. After selecting a limit,
the value for that limit is displayed. To change the limit, use the cursor keys and the RANGE keys to
display the desired value. Note that you must enter values in scientific notation.
Press ENTER to select your value and display the next menu, which selects the digital output action
to be taken if the selected limit is the first limit to be exceeded. The digital outputs can be toggled
between ON and OFF with the RANGE keys.
Each measurement function has a multiple display for the limits bar graph. It shows a pass/fail
indication and a graphical representation of the reading compared to limit set #1. If Low Limit #1 is
less than high limit #1, you see a display similar to that shown in the following figure.
Note that the Model 6517B does not check the validity of the high and low limit values when you enter
them. If Low Limit #1 is greater than or equal to high limit #1, the following message is shown on the
bottom line of the limits bar graph next display:
No bar graph: LLIM1 >= HLIM1
The programmed values for limit set #1 are shown by pressing the INFO key from the limits bar graph
next display.
Figure 92: Limits bar graph example - defined points of display
Figure 93: Limits bar graph example - Example display with limits ±1 V
6517B-901-01 Rev. C / August 2015
10-3
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