TELEVAC MX7M, Инструкция по эксплуатации

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Instruction Manual MX7M Active Gauge
Votge Otpt
×
10
H − 1
=
Pr essr e
To select the Linear output, navigate to the Analog Output screen, press ENT, and then use the
UP or DOWN arrow to select Linear. Press ENT to save the change. Then press DOWN once to
navigate to the Output High screen. Press ENT to unlock the screen and press UP or DOWN to
select the full scale pressure for the analog output.
B . Linear by Decade
The Linear by Decade output spans the MX7M measurement range. It uses the units digit of
the voltage reading to communicate the decade of the pressure reading and the units after
the decimal to communicate the specific pressure using the very generalized expression below,
where A, B, C, and D are digits ranging from 0-9:
Votge
=
A.BCD → Pr essr e
(
Tor r
) =
10
A −
11
× .BCD
For example, a voltage reading of 8.367 Volts corresponds to a pressure of 3 . 67
×
10
− 4
Torr.
10
8 − 11
×
. 367
=
10
− 3
∗ . 367
=
3 . 67
×
10
− 4
Tor r
To select the Linear by Decade output, navigate to the Analog Output screen, press ENT, and
then use the UP or DOWN arrow to select Linear by Decade. Press ENT to save the change. Note
that this analog output extends from 0 V to 9.1 V.
C . Linear by Decade 7F
The Linear by Decade 7F output spans the MX7M measurement range and is included for in-
creased compatibility of the MX7M to serve as a drop-in replacement for previous Televac offer-
ings. It uses the units digit of the voltage reading to communicate the decade of the pressure
reading and the units after the decimal to communicate the specific pressure using the very
generalized expression below, where A, B, C, and D are digits ranging from 0-9:
Votge
=
A.BCD → Pr essr e
(
Tor r
) =
10
A − 10
× .BCD
For example, a voltage reading of 8.367 Volts corresponds to a pressure of 3 . 67
×
10
− 3
Torr.
10
8 − 10
×
. 367
=
10
− 2
∗ . 367
=
3 . 67
×
10
− 3
Tor r
To select the Linear by Decade output, navigate to the Analog Output screen, press ENT, and
then use the UP or DOWN arrow to select Linear by Decade 7F. Press ENT to save the change.
D . Logarithmic
The Logarithmic output is an accurate output that can cover the entire range of the MX7M
or be used with a selected range. To use this output, the user must select an exponent that
corresponds to 10 V and the exponent that corresponds to 0 V. The exponent chosen for this
format uses the formula below to convert the output voltage into a pressure measurement. Note
that H is the exponent of the 10 V value and L is the exponent of the 0 V value. Volt is the analog
output voltage.
Spn
=
10
H − L
Oƒ ƒ set
=
0
−
L
Pr essr e
(
Tor r
) =
10
Vot
Spn
−
Oƒ ƒ set
For example, with the logarithmic range set to a 0 V value of 1 × 10
− 7
and a 10 V value of 1 × 10
− 3
and a voltage reading of 3.075 Volts, the pressure corresponds to:
Spn
=
10
− 3 −
(
− 7
)
=
2 . 5
Oƒ ƒ set
=
0
−
(
−
7
) =
7
email: sales@frederickscompany.com tel: +1 215 947 2500 web: frederickscompany.com mx7m_im rev C 13 of 23