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LDS1000 Protocol 21

3.2.4 Entry of Instrument Settings

The settings of parameters in the control modus "RS232" may be changed via the

command "U" for update when the jumper XJ1 has been set to RS232. The parame-

ters may be output via the serial interface through the command "Q" for query.

Forexample, "U0, 1.0E-4<cr>" changes the level for the first trigger to 1.0x 10-4.

Through "Q0<cr>" the trigger level can be read.

The settings are each explained in the Technical Handbook jina50e1-a.

In order to use the commands U51 to U66 the password needs to be entered.

Electronics temperature (ELTA) in

°C

e.g.: 23.5

Amplifier temperature (EVSTA) in

°C

e.g.: 29,2

G10 Anode potential (MIAP) in volts. e.g.: 457

G11 Cathode potential (MIKP) in volts. e.g.: 378

G12

Suppressor potential (MISP) in

volts.

e.g.: 330

G13

Anode-Cathode potential (MIAKP)

in volts.

e.g.: 79

G19

Speed of the turbopump (TMP) in

Hz.

e.g.: 1048

Command Meaning Representation

Q/U0 Trigger 1 in current unit e.g.: 1.0E-5

Q/U1 Trigger 2 in current unit e.g.: 1.0E-5

Q/U2 Trigger 3 in current unit e.g.: 1.0E-5

Q/U3 Trigger 4 in current unit e.g.: 1.0E-5

Q4 Output the operating mode

x, y (always 2 signs)

X: 0 – SPS, 1 - RS232

Y: 0 – VAC. 1 - SNIFF

Select operating mode This setting

is not saved when switching the

mains power off.

0 - VAC

1 - SNIFF

Q/U7

Sensitivity Threshold. Leak rate in

current unit at which the sensitivity

(averaging time) is

switched over.

e.g.: 1.0E-10

Q/U8

Zero time in seconds (period of

time for which the leak rate signal

must remain below the saved

background level until the saved

background level itself is

corrected).

e.g.: 5

Q10 Always 0

Q11 Limit-Low in current unit e.g.: 1.0E-8

Q12 Limit-HIGH in current unit e.g.: 1.0E4

Q/U13 Machine factor for VAC e.g.: 1.0E0

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 55 56

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