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
04_09
LDC-3700C Series
147
C H A P T E R
5
Remote Calibration of the LDC-3700C Controller
The LDC-3700C Series Controllers can be calibrated remotely via the GPIB
Interface. The following procedures are general guidelines for writing a program to
calibrate your instrument.
The operation complete flag (bit 0 of the Standard Event Status Register) may be
used to trigger a service request. This type of interrupt is enabled by setting bit 0
of the Service Request Enable register (via the
*ESE
command) and bit 5 of the
Service Request Enable register (via the
*SRE
command). Service request (SRQ)
handling depends on your GPIB hardware. Refer to your GPIB user's manual for
details.
After a calibration value is entered, the
*OPC?
query may be used to determine
when the calibration sequence is done. However, the
*OPC
, or
*WAI
command,
or
*OPC?
query should not be issued until after the expected calibration value is
entered, or the system will "hang". This happens because the LDC-3700C Series
Laser Diode Controller will wait indefinitely for an input, yet not allow any input
until the calibration is finished.
Thermistor Calibration
The following procedure is for calibrating the 100 µA and 10 µA thermistor current
sources so that the thermistor resistance measurement for these ranges will meet
the stated accuracy specifications.
1
Set the SENSOR SELECT switch (back panel) to the 100 µA position, the TEC display
code is --01.
2
Using the multimeter, measure and record the exact resistance of your metal film
resistors. (A 4-point probe resistance measurement is recommended.)
3
Connect the correct metal film resistor (See Table 5.1 on page 136) to the sensor input of
the Temperature Controller 15 pin connector on the rear panel and Sensor -
terminals.
4
Enter the
TEC:CAL:SENsor
command over the GPIB. The TEC display will show the
resistance value, and will then expect the actual value to be entered, in k
.
If this calibration value is to be measured and entered remotely via a GPIB controlled
DMM, for example, the actual value of the resistance should not be entered until the
Controller is ready to receive it. The Controller will be ready to receive the actual
(measured) resistance 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.
6
Switch the
SENSOR SELECT
switch (back panel) to the 10 µA, position, TEC display
code is --02, and repeat this procedure with the 100 k
resistor as the load at the Sensor
+ and Sensor - terminals.
Summary of Contents for LDC-3700C Series
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Page 8: ...L I S T O F FIG U R E S vi LDC 3700C Series...
Page 10: ...L I S T O F TA B L E S viii LDC 3700C Series...
Page 78: ...RE M O T E O PE R A T I ON Command Syntax 62 LDC 3700C Series C H A P T E R 3...
Page 150: ...C O M M A N D RE F E R E N C E Command Reference 134 LDC 3700C Series C H A P T E R 4...