MKS 670B - System Check Calibration

The [SETUP] Key Cha
p
ter Four: Functional Overview
46
Response
Ch 1 760 T
Response 400 mSec.
The response can be set to 1, 40, or 400 milliseconds. The response entry selects the filter used
to reduce noise in the pressure signal
before
it goes to the analog-to-digital (A/D) converter. This
entry affects the displayed value, the value reported by the remote communications, and the
pressure output signal. Setting the response too low may cause a noisy signal. Use the Adjust
knob to toggle through the three options.
Note
The response entry does not affect the sampling period of the A/D
converter or the display update rate. The A/D converter samples every
0.1 seconds (ten times
p
er second). The
p
ressure readin
g
in the dis
p
la
y
is
updated every 0.25 seconds (four times per second).
Instrument Response Settings
Milliseconds
≈3 db Frequency (Hz)
1 165
40 4
400 0.4
Table 13: Instrument Response Settings
Averaging
, page 51, discusses the relationship between the response and averaging entries.
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