Output Data Curve Buffer - Ametek 7280 Instruction Manual

Chapter 6, COMPUTER OPERATION

6.4.09 Output Data Curve Buffer

CBD [n]
6-26
Curve buffer define
Defines which data outputs are stored in the curve buffer when subsequent TD (take
data), TDT (take data triggered) or TDC (take data continuously) commands are
issued. Up to 17 (or 22 in dual reference and dual harmonic modes) curves, or
outputs, may be acquired, as specified by the CBD parameter.
The CBD parameter is an integer between 1 and 131,071, being the decimal
equivalent of a 17-bit binary word. In either of the dual reference modes, it is an
integer between 1 and 4,194,303, being the decimal equivalent of a 22-bit binary
number. When a given bit is asserted, the corresponding output is selected for
storage. When a bit is negated, the output is not stored. The bit function and range for
each output are shown in the table below:
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
16 65536
Dual modes only:-
17 131072
18 262144
19 524288
20 1048576
21 2097152
32768 points are available for data storage, shared equally between the specified
curves. For example, if 16 outputs are stored then the maximum number of storage
points would be 2048 (i.e. 32768/16). The only exception to this rule is that the
Frequency curve (curves 15 and 16) occupies the equivalent of any two other curves.
The LEN command sets the actual curve length, which cannot therefore be longer
than 32768 divided by the number of curves selected. If more curves are requested
than can be stored with the current buffer length, then the buffer length will be
automatically reduced. Its actual length can of course be determined by sending the
LEN command without a parameter.
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 bits 0 to 15 (millihertz)
Reference frequency bits 16 to 31 (millihertz)
X Output (±10000 FS)
2
Y Output (±10000 FS)
2
Magnitude2 Output (0 to +10000 FS)
Phase Output (±18000 = ±180°)
2
Sensitivity setting (3 to 27) + IMODE
2
(0, 1, 2, 3 = 0, 32, 64, 128)