3.4 Commands
47
3.4.4 Configuration Commands
(continued)
Relative Phase
RELP(?) {
z
}
Set (query) the chopper phase display as a relative measurement {to
z
= (
OFF 0
,
ON 1
)}. When relative phase is switched from OFF to ON,
the current phase is subtracted from the displayed value, such that the
displayed value jumps to 0
°
.
Any changes to the phase while relative
phase remains ON are now displayed relative to this new zero. Switch‑
ing relative phase from ON to OFF will add back the original phase offset
to the currently displayed value of Phase.
The
RELP
command is similar to pressing
Rel
Phase
, though the set com‑
mand requires {
z
}, and does not automatically toggle the Relative Phase
state.
»
PHAS?
Example:
90.0000
»
RELP ON
»
PHAS?
0.0000
»
PHAS 15.6
»
RELP OFF
»
PHAS?
105.6000
Frequency Multiplier
MULT(?) {
i
}
Set (query) the integer multiplier
n
of the frequency source {to
i
= (1, 2,
3,…200)}.
»
MULT 2
Example:
Frequency Divisor
DIVR(?) {
i
}
Set (query) the integer divisor
m
of the frequency source {to
i
= (1, 2,
3,…200)}.
»
DIVR?
Example:
3
SR542 Precision Optical Chopper
