Ametek 7280 Instruction Manual page 159

In the burst modes, data is stored in the curve buffer. Use the LEN command to set
the number of points required. Note that it may be necessary to enter CBD 256 before
setting the length, if the curve buffer has previously been used for more than one data
type. The data is read out from the buffer using DC[.] 8 for ADC1 and DC[.] 9 for
ADC2. If the length is set to more than 16384 and a burst mode which stores both
ADC1 and ADC2 is specified then the curve length will automatically be reduced to
16384 points. Note also that setting the TADC parameter to any value other than 0 or
1 affects the CBD parameter, as follows:
TADC parameter
0
1
2
3
4
5
6
7
8
9
10
11
12
13
The maximum sampling rate depends on the number of ADC inputs used, and is
either 25 µs when sampling ADC1 only, or 56 µs when sampling both ADC1 and
ADC2.
In the Variable Rate modes, the sampling speed is set by the BURSTTPP (burst time
per point) command.
NOTE: TADC modes 10 to 13 cause all other functions of the host microprocessor
to be suspended, including responding to computer commands, until a trigger is
received at the TRIG input. Hence they should only be used when the user is
certain that such a trigger will occur.
BURSTTPP [n] Sets the burst mode time per point rate for ADC1 and ADC2
n sets the time per point for the Variable Rate burst modes in microseconds, as
follows:-
When storing only to ADC1:
(i.e. TADC 2, TADC 4, TADC 6, TADC 8, TADC10 and TADC12)
25 ≤ n ≤ 5000
When storing to ADC1 and ADC 2:
(i.e. TADC 3, TADC 5, TADC 7, TADC 9, TADC11 and TADC13)
56 ≤ n ≤ 5000
Effect on CBD parameter
none
none
automatically set to 256
automatically set to 768
automatically set to 256
automatically set to 768
automatically set to 256
automatically set to 768
automatically set to 256
automatically set to 768
automatically set to 256
automatically set to 768
automatically set to 256
automatically set to 768
Chapter 6, COMPUTER OPERATION
6-25