Ametek 7280 Instruction Manual page 199

Bit Decimal value
0 1
1 2
2 4
3 8
4 16
5 32
6 64
7 128
8 256
9 512
10 1024
11 2048
12 4096
13 8192
14 16384
15 32768
Dual modes only:-
17 131072
18 262144
19 524288
20 1048576
21 2097152
The values of the selected curves at the same sample point are transferred as a group
in the order of the above table, separated by the chosen delimiter character and
terminated with the selected terminator. This continues until all the points have been
transferred.
NOTE: When transferring the Frequency curve, which is saved when bit 15 in the
CBD parameter is asserted, the instrument automatically reads the data for each
stored point in both frequency curves (i.e. the lower and upper 16 bits) and sends it
as a single data point.
DD [n] Define delimiter control
The value of n, which can be set to 13 or from 32 to 125, determines the ASCII value
of the character sent by the lock-in amplifier to separate two numeric values in a two-
value response, such as that generated by the MP (magnitude and phase) command.
DEFEQU [n n n n n
1 2 3 4
The DEFEQU command is used to define the user equations, which take the
following form:
(A
⎛
Equation = ⎜
⎝
Parameter n is used to specify the equation to be modified, and is either 1 for
1
Equation 1 or 2 for Equation 2.
Appendix F, ALPHABETICAL LISTING OF COMMANDS
Output and range
X Output (±10000 FS)
Y Output (±10000 FS)
Magnitude Output (0 to +10000 FS)
Phase (±18000 = ±180°)
Sensitivity setting (3 to 27) + IMODE (0, 1, 2, 3 =
0, 32, 64, 128)
Noise (0 to +10000 FS)
Ratio (±10000 FS)
Log ratio (-3000 to +2000)
ADC1 (±10000 = ±10.0 V)
ADC2 (±10000 = ±10.0 V)
ADC3 (±10000 = ±10.0 V)
ADC4 (±10000 = ±10.0 V)
DAC1 (±10000 = ±10.0 V)
DAC2 (±10000 = ±10.0 V)
EVENT variable (0 to 32767)
Reference frequency (millihertz)
X Output (±10000 FS)
2
Y Output (±10000 FS)
2
Magnitude2 Output (0 to +10000 FS)
Phase Output (±18000 = ±180°)
2
Sensitivity
2
(0, 1, 2, 3 = 0, 32, 64, 128)
n ] Define user equation
5 6
± B) × C
⎞
⎟
⎠
D
setting (3 to 27) + IMODE
F-7