MKS 670B - Operation; Configuring the 670 Instrument

The [SETUP] Key Cha
p
ter Four: Functional Overview
52
The pressure reading is 53.4 at time T+0.5. At time T+0.6, the 670 instrument computes a new
moving average, dropping the oldest value, 52 in the example above, and adding the reading
collected at time T+0.6, in this case 58:
53
52
57
53
58
273 ÷ 5 = 54.6
The pressure reading changes from 53.4 to 54.6.
Use the averaging entry, in conjunction with the response entry, discussed on page 46, to achieve
the best compromise between a quick response and minimal digit flickering. Refer to Table 14
for the optimal averaging and response entries.
Optimal Averaging and Response Entries
Averaging Entry Response Entry
1 - 3 1
4 - 9 40
10 - 100 400
Table 14: Optimal Averaging and Response Entries
In general, an averaging entry of 20 and a response entry of 400 milliseconds offers an acceptable
response. If you are using the 670 instrument in a pressure control application, set the response
entry to 1 millisecond.
The number of samples to average can range from 1 to 100, inclusive. The initial averaging
value is 20.
Disabling Averaging
To disable averaging, set the averaging entry to 1. This causes the 670 instrument to report each
pressure reading independent of the preceding value. In the previous example, the pressure
reading would change from 53 to 58.
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