Ametek 7270 - Page 215

Appendix E, ALPHABETICAL LISTING OF COMMANDS
E-23
NOISEMODE
= 0
NOISEMODE
= 1
NOISEMODE
= 0
NOISEMODE =
1
n
time constant
time constant
n
time constant
time constant
0
10 µs
N/A
16
2 s
N/A
1
20 µs
N/A
17
5 s
N/A
2
50 µs
N/A
18
10 s
N/A
3
100 µs
N/A
19
20 s
N/A
4
200 µs
N/A
20
50 s
N/A
5
500 µs
500 µs
21
100 s
N/A
6
1 ms
1 ms
22
200 s
N/A
7
2 ms
2 ms
23
500 s
N/A
8
5 ms
5 ms
24
1 ks
N/A
9
10 ms
10 ms
25
2 ks
N/A
10
20 ms
N/A
26
5 ks
N/A
11
50 ms
N/A
27
10 ks
N/A
12
100 ms
N/A
28
20 ks
N/A
13
200 ms
N/A
29
50 ks
N/A
14
500 ms
N/A
30
100 ks
N/A
15
1 s
N/A
N/A means that n is an illegal value under these conditions.
The TC. command is only used for reading the time constant, and reports the current
setting in seconds. Hence if a TC 12 command were sent and the noise measurement
mode was turned off, TC would report 12 and TC. would report 1.0E-01, i.e. 0.1 s or
100 ms.
TD Take data
Initiates data acquisition. Acquisition starts at the current position in the curve buffer
and continues at the rate set by the STR command until the buffer is full. If an
oscillator frequency and/or amplitude sweep has been defined and linked to the curve
buffer using the SWEEP command with a parameter of 9, 10 or 11, then this sweep
will be started as well.
TDC n Take data continuously
Initiates data acquisition. Acquisition starts at the current position in the curve buffer
and continues at the rate set by the STR command until halted by an HC command or
on receipt of a trigger at the TRIG in connector, in accordance with the following
table:
n Start condition Stop condition
0 On command On HC command
1 On command Ext rising edge
2 On command Ext falling edge
Note also that if sent without a parameter the command functions as if TDT 0 had
been sent.
The buffer is circular in the sense that when it has been filled, new data overwrites
earlier points.