Prevac MG15 - Identifying Resistances for Supported Gauges

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MULTI GAUGE CONTROLLER OPERATION

• Degassing voltage - May be set between 400 and 600V. The MG15 is used during degassing

the electron bombardment method. It is recommended to carry out degassing at the highest

voltage admissible by the gauge. At a higher voltage a lower emission current is required to

obtain the same degassing power, which affects positively the life of the ilament.

3.6.1.4 ACTIVE GAUGE SETTING

To obtain correct indications choose a gauge compatible with the physically connected one. For

that purpose click on Setup menu →Sensor →IG1 or CH3 or CH4 and select the required gauge.

The user can select one of the standard gauges or a gauge named as Deined, which enables any

gauge of a logarithmic character with 0 -10 V output to be connected (details in 3.6.1.5).

A linear gauge deined by the user can also be added. For that purpose Baratron gauges have the

FS Deined item. This item enables any Full scale parameter in Torrs to be introduced.

The MG15 enables also automatic detection of a connected gauge if it has an in-built identiication

resistor. To activate automatic detection of active gauges enter the Setup menu →Sensor →Auto

identiication and activate this option for the chosen vacuum channel. If the connected gauge has

been successfully identiied its name will be displayed in the Sensor menu and on the main window

by the relevant vacuum channel.

GAUGE IDENTIFYING RESISTANCE

CTR90/91 13,2k

TTR90/91/221 27kΩ

PTR225 100kΩ

PKR251/360/361 9,1kΩ

PCT280 3,01kΩ

PTR90 85kΩ

ITR90 42kΩ

IKR360/361 5,1kΩ

Table 3.1: Identifying resistances for supported gauges

For CTR90/91 gauges, if they are successfully auto-identiied, specify also the Full scale factor. It

can be done analogically to the manual selection of a gauge type.

Note

If the active gauge cannot be manually set (empty selection list), it means that

the Auto-identiication option is active.

3.6.1.5 USER-DEFINED ACTIVE GAUGE

The option enables the user to deine his own gauge. The condition is that it is a logarithmic active

gauge (0 -10 V).

To deine a gauge for the selected channel enter Setup menu →Sensor →IG1 or CH3 or CH4 →De-

ined and set accordingly the equation factors characterising the gauge:

User manual rev. 03 Page 63