Ametek 7230 Instruction Manual page 142

Appendix E, ALPHABETICAL LISTING OF COMMANDS
CH n
E-4
Bit Decimal value
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
100,000 points are available for data storage in the standard curve buffer mode,,
shared equally between the specified curves. For example, if 16 outputs are stored
then the maximum number of storage points would be 6250 (i.e. 100000/16). 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 100000 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.
The reason why bit 4 and, for dual reference modes, bit 21, which store both the
sensitivity and the IMODE setting, are needed, is to allow the instrument to transfer
the acquired curves to the computer in floating point mode. Without this information,
the unit would not be able to determine the correct calibration to apply.
Note that the CBD command directly determines the allowable parameters for the
DC, DCB and DCT commands. It also interacts with the LEN command and affects
the values reported by the M command.
Since the reference frequency requires 32-bit wide data points, it occupies two curve
positions. For ease of use, if bit 15 is selected for storage then bit 16 will be
automatically selected as well, and vice-versa.
NOTE: At least one of the curves selected for storage in the curve buffer must be
chosen from those marked with an asterisk(*) in the above table.
[n ] DAC analog output control
1 2
Defines what outputs appear on the DAC1, DAC2, DAC3 and DAC4 connectors on
the rear panel.
n is compulsory and is 1 for DAC1, 2 for DAC2, 3 for DAC3, or 4 for DAC4
1
Output and range
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 (1 to 27) + IMODE
2
(0, 1, 2 = 0, 32, 64)