HP 8648 A/B/C/D - Changpuak.ch

External Modulation External modulation input level status may be queried for high, low,
Input Level Status or input level correct. The instrument automatically detects the input
level (1 Vpk into 600 ohms for full scale modulation) and displays
the result on the front panel display but must be queried for HP-IB
reporting.
2-14 HP-IB Programming
Example: Check the Condition of Modulation Input
(High or Low)
18 I:IIJTPIJT 7 1’3; “STHT: t:!lJE!;: MI:ID: l:I:it.jD?”
28 EtjTER 71’3; ‘+.s~I,J~
38 pll:uj=B I t~~~~~~l 1:: ‘,:‘a 1 IAe g 1 >
48 IF Mod= 1 THEH PR I tdT “Ext. . tk~cl. Input. Hi &I”
!y@ Mod=BI tq+jD r:$!.=J1ue9 :::I
68 IF Mod=? THEN F’RI NT “Ext. , Pltscl. Irlput. LI:~I.,~”
78 Et.j[>
Line 10 Queries the condition of the MODulation register.
Besides querying the condition you may also query
if an event has occurred, such as the external
modulation input being high or low at some previous
time. Replace the COND? with EVEN? to read the
event status. Reading the event status clears the
register.
Line 20
Line 30
Line 40
Line 50
Line 60
Enters the condition of the MODulation register into
the variable “Value”.
Uses the HP BASIC command, BINAND to check the
contents of bit 0 in “Value”. If bit 0 is a “1” it will be
reported as a decimal equivalent “ 1” and “Mod” will
equal “ 1”.
Checks if the MODulation condition is “ 1” and if true,
prints that the external modulation input is high.
Uses the HP BASIC command, BINAND to check
the contents of bit 1 in “Value”. If bit 1 (decimal
equivalent “2”) is a “l”, “Mod” will equal “1”.
Checks if the MODulation condition is “2” and if true,
prints that the external modulation input is low.