++ed by:
AMBA

1 PAUSE user
1 non-PAUSE user.

Andreas K. Hüttel
and 4 contributors

NAME

        Lab::Instrument::Lakeshore33x - Lakeshore 33x Temperature controller

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SYNOPSIS

        use Lab::Instrument::Lakeshore33x;
        my $lake=new Lab::Instrument::Lakeshore33x($gpib_board,$gpib_address);

        $temp = $lake->get_T();
        $r = $lake->get_R();

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DESCRIPTION

The Lab::Instrument::Lakeshore33x class implements an interface to the Lakeshore 33x AC Resistance Bridge.

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CONSTRUCTOR

        $lake=new Lab::Instrument::Lakeshore33x($gpib_board,$gpib_address);

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METHODS

get_T

        $t = $lake->get_T(<$channel>);

Reads temperature in Kelvin (only possible if temperature curve is available, otherwise returns zero).

$channel

CHANNEL is an optinal parameter to select the sensor channel (A/B) for the measurement. If not defined the default channel 'A' will be selected. Possible values are 'A' and 'B'.

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get_R

        $t = $lake->get_R(<$channel>);

Reads resistance in Ohm.

$channel

CHANNEL is an optinal parameter to select the sensor channel (A/B) for the measurement. If not defined the default channel 'A' will be selected. Possible values are 'A' and 'B'.

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set_T

        $sp = $lake->set_T($setpoint, <$loop>);

Set new temperature SETPOINT for temperature control loop $loop. Returns the new setpoint. If no parameters are given, the currently valid SETPOINT will be returned.

$setpoint

New temperature Setpoint.

$loop

Optional prameter to select the temperature control loop for which the new setting will be valid. If not defined the default value $loop = 1 will be selected. Possible values are '1' and '2'.

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set_range

        $heater_range = $lake->set_range($range);

Set the HEATER RANGE.

$range

RANGE can be 'OFF', 'LOW', 'MEDIUM' or 'HIGH'.

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set_input_curve

        $lake->set_input_curve($channel, $curve);

Set for SENSOR CHANNEL $channel the resistance-to-temperatur CURVE with the internal storage number $curve.

$channel

CHANNEL selects the SENSOR CHANNEL and can be 'A' or 'B'.

$curve

CURVE reverse to one ov the internally stored resistance-to-temperatur CURVES and can be 0 .. 41.

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set_PID

        @PID = $lake->set_PID($P,$I,$D);

Set new values for the PID temperature control circuit.

$P

The PROPORTIONAL term, also called gain must have a value greater then zero for the control loop to operate. It's maximum value is 1000.

$I

The INTEGRAL term looks at error over time to build the integral contribution to the output. Values are 0.1 ... 1000.

$D

The DERIVATIVE term acts aon the change in error with time to make its contribution to the output. Values: 0 ... 200.

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config_sweep

        $lake->config_sweep($setpoint, $rate);

Predefine a temperature sweep.

$setpoint

Predefine the temperature target setpoint for a temperatue sweep. Values 0 .. 300 K.

$rate

Predefine sweep rate for a temperature sweep. Values 0.1 ... 100 K/minute.

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trg

        $lake->trg();

Start a predefined temperature sweep.

halt

        $lake->halt();

Stop running temperature sweep.

active

        $lake->active();

Returns 1 if a temperature sweep is running and 0 if not.

wait

        $lake->wait();

Wait until the currently active temperature sweep has been finished.

id

        $id=$sr780->id();

Returns the instruments ID string.

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CAVEATS/BUGS

probably many

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SEE ALSO

Lab::Instrument

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AUTHOR/COPYRIGHT

This is $Id: Lakeshore336.pm 650 2010-04-22 19:09:27Z schroeer $

Modified 2011 by Stefan Geissler

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

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