Fluke 8840A - Trigger Selection Logic Diagram

Renxde Progo
DEVICE-DEPENDENT COMB
TRIGGER METHOD
CONTINUOUS
-
TRIGGER
I '
1
BUS TRIG(
(? or GE'
FRONT PANEL
TRIGGER
SETTLING
TI. T2
DELAY
T2,T4
R~AR PANEL
0
TRIGGER
. ., .-
DEVICE CLEAR,
EX TRIG
BUTTOh'
EAR
MEASUREMEh
CIRCUITRY
'With EXTRIG enabll
Switches represent effect of indicated commands, buttons, and remote/local status.
Instrument shown in power-up state (TO, local, rear panel trigger enabled).
~mbg
SJD GET
-
I
I.
TRIGGER METHOD DESCRIPTION 1
I
I
1. Continuous Trigger
Continuous trigger generated by
8840A in internal trigger mode (TO).
~
Single trigger initiated by ? command from controller.
2.
? Command
3. GET Command
4. Front Panel Trigger
5. Rear Panel Trigger
Single trigger initiated
by GET command (an interface message) from
control ter.
Single trigger initiated
by front panel TRIG button.
Single trigger initiated from rear panel EXTTRIG input. (Disabled by TO, T2, T4
Fiute 3-7. Trigger Selection Logic Diim
I
response to G2 or trigger commands). Thc suffix includes
convert
the numeric part into a numeric variable.
a comma,
an overrange indicator (>), and a function
it
is much easier to read the
indicator (VDC, VAC OHM, IDC, or IAC). The suffix is
numeric variable
and the suffix into a
illustrated
in Figure 3-6. An example of suffixed data is
leading comma of the suffix
given in paragraph
3-43.
delimiter. For example, a BPLSIC
be:
To read suffixed data with a controller using BASIC, one
can read the whole line into a string variable and then
INPUT @1,A, BS
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