Microsoft LPF-00004 Manuel de l'opérateur télécharger pdf (Page 134)

Page 116 PROGRAMMER'S GUIDE

YBER

380, COPYRIGHT MARCH 2002, AXON INSTRUMENTS, INC.

5) If the investigator uses BNC cables to connect the CyberAmp 380 output to the input of a data

acquisition interface, the CyberAmp channel numbers need not correspond to the interface

channel numbers. Thus, a connections table should be maintained. In the ultimate case of

intelligent support, the connections table could be automatically configured. To do so, the

program sets the inputs of all CyberAmp 380 channels to ground and the gain to x1. One by one,

the DC offset of each CyberAmp 380 channel is set to +1 volt while all of the others are left at

zero. The A/D channels are sampled and the one connected to the active CyberAmp 380 channel

is detected.

6) If a probe is recalibrated, the user should be given the opportunity to update the probe EEPROM.

7) Acquisition programs do not generally need to include the ability to make free-form changes to

the probe EEPROM contents. This is supported by the CMD300 software provided with the

instrument.

8) When the user quits the acquisition program, the program should issue the ATdW command to

tell the CyberAmp to save its current configuration in its EEPROM. There is no need to wait for

the confirmation response.

9) Each time the data acquisition program is started, it should configure the CyberAmp 380

according to the settings stored in the initialization file of the acquisition program. It is not

normally appropriate to rely on the existing values in the CyberAmp 380 because they might

have been altered by another program.

10) If the data acquisition program supports more than eight channels, there should be support for

two or more CyberAmp 380s. For example, if two CyberAmps are installed, channels 0-7 in the

data acquisition program might be connected to channels 1-8 on the first CyberAmp, with

channels 8-15 in the data acquisition program connected to channels 1-8 on the second

CyberAmp.

11) There is an uncertainty of several milliseconds in knowing the exact time that the CyberAmp

responds to a command. The simplest strategy is to assume that the setting is updated at the

instant the ">" response is received from the CyberAmp.

12) The probe EEPROMs contain recommended input couplings and low-pass filter settings. Some

consideration should be given to checking these against the user's settings.

1 2 ... 129 130 131 132 133 134 135 136 137 138 139 ... 156 157

Pas de commentaire

Microsoft LPF-00004 Manuel de l'opérateur Page 134