Model 6485 Picoammeter Instruction Manual
Limit Tests
8-5
Application
— A typical application for a 2-stage limit test is to sort a batch of DUT
according to tolerance. For example, you may want to sort diodes (all having the same
nominal value) into three groups, 1%, 5%, and >5%. The limits for limit 1 would be the
5% tolerances, and the limits for limit 2 would be the 1% tolerances. If a diode passes both
tests, it belongs in the 1% group. If it passes limit 1, but fails limit 2, it belongs in the 5%
group. If it fails both tests, it belongs in the >5% group.
Front panel operation
Limit test configuration
Most aspects of limit testing are configured from the limit configuration menu. Once in a
menu structure, use the
and
keys to display menu items. Use the cursor
and
and
the
and
keys to key in values. To change polarity of a value, place the cursor on “+” or
“-” and press either of the
or
range keys. To change range for the value, place the cur-
sor on the range symbol and scroll using the
and
range
keys (P = pico,
N
= nano, µ =
micro, m = milli, ^ = x1, K = kilo, M = mega, G = giga, T = tera). A menu item or value is
selected by pressing ENTER.
Limits configuration menu
The configuration menu for limits is structured as follows. Bullets denote the main items
of the menu. To access the menu, press CONFIG and then LIMIT.
LIMIT 1
— Configure limit 1 test:
1.
CONTROL
— Enable or disable limit 1 test.
2.
HILIM
— Set the HI limit (-9.999999T to +9.999999T).
3.
LOLIM
— Set the LO limit (-9.999999T to +9.999999T).
LIMIT 2
— Configure limit 2 test:
1.
CONTROL
— Enable or disable limit 2 test.
2.
HILIM
— Set the HI limit (-9.999999T to +9.999999T).
3.
LOLIM
— Set the LO limit (-9.999999T to +9.999999T).
Arm layer configuration menu
To access the menu, press CONFIG and then TRIG. Use the
and
range
keys to scroll
to the ARM menu.
•
ARM-IN
— Select the “start of test” option:
IMM
(Immediate) — Test starts when LIMIT key is pressed.
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Страница 219: ...A Specifications ...
Страница 221: ...B StatusandErrorMessages ...
Страница 227: ...C GeneralMeasurement Considerations ...
Страница 233: ...D DDCEmulationCommands ...
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Страница 250: ...E 4 Example Programs Model 6485 Picoammeter Instruction Manual ...
Страница 251: ...F IEEE 488BusOverview ...
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Страница 267: ...G IEEE 488andSCPI ConformanceInformation ...
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