HBK CB1010, Руководство по эксплуатации

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49
CANHEAD
CANHEAD ENHANCEMENTS
Example
Measurement with 12 modules (120 channels), 0.6 Hz filter and 20 S/s data rate. If load­
ing follows a ramp, then of 80 measurement points, internal sampling only takes place 75
times; the same value is transmitted in duplicate 5 times. Every 16 measured values or
0.8 seconds, a duplicate appears in the ramp. The data rate 18.75 Hz should be selected
here.
These considerations are not relevant when measuring stationary states, or for signals
with superimposed noise.
10.3 Synchronous mode (ML801B)
If CANHEADs and an ML801B are to measure comparable responses in an MGCplus sys­
tem, a relevant filter must be selected in the ML801B, and delay time compensation activ­
ated.
The CANHEAD filters are available in the ML801B from P6.56, and must be activated via
the software. The “Enhanced settings" dialog window of ML801B now has “additional
filter sets", where the CANHEAD filters can be activated.
This setting is permanently stored in ML801B.
Delay time compensation is set under “Delay" in 1/600 second steps = 1.66 ms. The cor­
rect setting is:
S
At 250 kBaud: 2 x module count + 1
S
At 500 kBaud: 1 x module count + 1
“Module count" is the number of assigned CANHEADs or the “ Minimum number of CAN­
HEADs " assigned in MGCplus, which is greater than the number of modules.
This setting is also permanently stored in ML801B, but only becomes active if the “Bessel
CANH" filter type is selected. When the setting is changed, the filter must be modified
once again, e.g. type or frequency.