Stanford Research Systems SR865A, Руководство по эксплуатации

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150 Programming Chapter 4
SR865A DSP Lock-in Amplifier
LIAS? { j }
The LIAS? command queries the value of the
lock-in (LIA) status word
. The value is
returned as a decimal number from 0 to 4095. The LIAS? j command queries the value
(0 or 1) of bit j (0 – 11). Reading the entire word will clear it while reading bit j will clear
just bit j.
Example
LIAS? Returns decimal value of the lock-in status word
LIAS? 8 Returns bit 8 of the lock-in status byte
CUROVLDSTAT?
The
CUROVLDSTAT?
command queries the present overload states of the lock-in. These
overloads reflect the state of the lock-in at the time the command is processed. They are
NOT set until read.
The value is returned is a decimal number from 0 to 4095 where the bits are defined
below.
Bit Weight Definition
0 1 CH1 output scale
1 2 CH2 output scale
2 4 unused
3 8 External reference unlocked
4 16 Input range
5 32 unused
6 64 unused
7 128 unused
8 256 Data Channel 1 scale
9 512 Data Channel 2 scale
10 1024 Data Channel 3 scale
11 2048 Data Channel 4 scale
Example
CUROVLDSTAT? Returns decimal value of the overload status word