Ametek 7230 - Page 100

Chapter 6, COMPUTER OPERATION
6-14
synchronous time constant control is turned off, the fast analog output mode is
turned on (FASTMODE 1), and the output filter slope is set to 12 dB/octave if it had
previously been 18 or 24 dB/octave.
NNBUF [n] Noise Buffer Length control
The value of n sets the noise buffer length according to the following table:
n Function
0 Noise buffer off
1 1 second noise buffer
2 2 second noise buffer
3 3 second noise buffer
4 4 second noise buffer
TC [n]
TC. Filter time constant control
The value of n sets the output filter time constant in accordance with the following
table:
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.
SYNC [n] Synchronous time constant control
n Effect
0 Synchronous time constant disabled
1 Synchronous time constant enabled