C A L I B R A T I O N A N D T R O U B L E S H O O T I N G
Calibration Overview
7/01
LDC-3700 Series
123
C H A P T E R
5
is −−04.
2
Connect a precision 16.8 k
Ω
(metal film) resistor and multimeter in series at the sensor
input of the Temperature Controller 15 pin connector on the rear panel. Configure the
multimeter to measure current in
µ
A.
3
Enter the "TEC:CAL:SENsor" command over the GPIB. The TEC display will show the
current value in
µ
A (not enunciated).
4
Input the actual current measured by the external ammeter (as an <nrf value>) via the
"TEC:R <nrf value>" command.
If this value is to be measured and entered remotely via a GPIB controlled DMM, for
example, the measured value of the current should not be entered until the LDC−3700B
Series Laser Diode Controller is ready to receive it. The Controller will be ready to receive
the measured value when, after a "TEC:CAL:SEN?" query is sent, the response from the
Controller is "1".
5
Once the "TEC:R" value is sent, the Controller will return to its former state (before
calibration). The "OPC?" query may be used (after the "TEC:R" value is sent) to
determine when the calibration is completed.
LM335 Sensor Calibration
The following procedure is for calibrating the LM335 sensor so that the measured temperature will
be as accurate as possible. This procedure is for remote operation through the GPIB Interface.
1
Set the SENSOR SELECT switch (back panel) to the LM335 position, TEC display code
is −−03.
2
Connect a precision 6.8 k
Ω
(metal film) resistor and the multimeter in parallel to the
sensor input of the Temperature Controller 15 pin connector on the rear panel. Configure
the multimeter to measure voltage in mV.
3
Enter the "TEC:CAL:SENsor" command over the GPIB. The TEC display will show the
voltage in mV (not enunciated).
4
Input the actual voltage measured by the multimeter (as an <nrf value>) via the "TEC:R
<nrf value>" command.
If this value is to be measured and entered remotely via a GPIB controlled DMM, for
example, the measured value of the voltage should not be entered until the Controller is
ready to receive it. The Controller will be ready to receive the voltage value when, after a
"TEC:CAL:SEN?" query is sent, the response from the Controller is "1".
5
Once the "TEC:R" value is sent, the Controller will return to its former state (before
calibration). The "OPC?" query may be used (after the "TEC:R" value is sent) to
determine when the calibration is completed.
I
TE
Current Calibration
The following procedure is for calibrating the I
TE
bi−polar constant current source. This procedure
calibrates the zero current set point, then it automatically drives the TE current output to internally
set limits of +2.000 amps. When each of these values is reached and is stable, the user enters the
actual value of the current, as measured by an external DMM. The LDC−3700B Series Laser Diode
Controller then automatically calibrates the TEC current source and limits.
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