8-16
Limit Tests and Digital I/O
Model 6487 Reference Manual
Front panel operation — limit tests
Limit test configuration
Most aspects of limit testing are configured from the limit configuration menu. Once in a
menu structure, use the cursor keys to display menu items. Use the cursor keys to key in
values. To change polarity of a value, place the cursor on “+” or “-” and press either of the
RANGE keys. To change range for the value, place the cursor on the range symbol and
scroll using the 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.
Digital output bit patterns
— An output pattern is set by selecting a decimal value (0 to
15) that corresponds to the 4-bit BCD pattern of the output. To determine the output pat-
tern value, add up the decimal weight values for the desired HI lines:
For example, to set an output pattern to 0101 (lines 3 and 1 HI), set the output value to
5 (4 +1).
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:
•
CONTROL
— Enable or disable Limit 1 test.
•
HILIM
— Set the HI limit (-9.999999T to +9.999999T).
•
LOLIM
— Set the LO limit (-9.999999T to +9.999999T).
LIMIT 2 — Configure Limit 2 test:
•
CONTROL
— Enable or disable Limit 2 test.
•
HILIM
— Set the HI limit (-9.999999T to +9.999999T).
•
LOLIM
— Set the LO limit (-9.999999T to +9.999999T).
PASS — Set the digital output bit pattern for the “all tests pass” condition (0 to 15).
DIG CLR (Digital Clear):
•
AUTO CLR
— Enable or disable auto-clear for the digital output.
•
DEL
(Delay) — Set the pass/fail pattern pulse width (0 to 60 sec with 10µsec
resolution).
•
DIGOUT
— Set the digital output clear pattern (0 to 15).
Output HI Line:
Out 4
Out 3
Out 2
Out 1
Decimal Weight:
8
4
2
1
