Fluke 8845A - Page 84

8845A/8846A
Programmers Manual
74
Compare Commands and Queries
The commands in Table 25 cause the Meter to determine whether a measurement is
higher than, lower than, or within a specified range.
Table 25. Compare Commands and Queries
Command Description
COMP
COMP?
COMPCLR
COMPHI
<high value>
COMPLO
<low value>
Meter enters compare (COMP) function.
Meter returns "Hl" if the last COMP measurement reading was above the compare
range, "LO" if it was below it, "PASS" if within compare range, or "— " if a
measurement has not been completed.
Meter exits compare function, and restores display to normal operation.
Sets HI compare (COMP) value to <high value>, where <high value> can be a signed
integer, signed real number without exponent, or signed real number with exponent.
Sets LO compare (COMP) value to <low value>, where <low value> can be a signed
integer, signed real number without exponent, or signed real number with exponent.
Trigger Configuration Commands
The commands in Table 26 set and return the trigger configuration.
Table 26. Trigger Configuration Commands
Command Description
TRIGGER
<type>
TRIGGER?
Sets the trigger configuration to <type>.
<type> corresponds to a number between 1 and 5 selected from Table 26A. If the
<type> entered is not one of these listed numbers, an Execution Error is generated.
Table 26A. Trigger Type
Type Trigger Rear Trigger Settling Delay
1
2
3
4
5
Internal
External
External
External
External
-
Enabled
[1]
Enabled
[1]
Enabled
Enabled
-
Off
On
Off
On
[1] Although the Fluke 45 disabled the rear-panel
trigger for these trigger types, the 8845A/46A
leaves the rear-panel trigger enabled.
When the input signal is not stable, select a trigger type with the settling delay (type 3 or 5)
enabled before a measurement is triggered.
Returns the trigger <type> set by the TRIGGER command.