Quick Reference Guide
13
Basic operation
The basic procedure for laser diode testing is provided in
Table 2 .
It assumes that the
DUTs are already connected to the Model 2520 testhead connectors as explained in
“Basic
connections,” page 8
.
Remote command programming
Data string
The :READ? command is typically used to trigger the unit and request the data string. The
data string is sent to the computer when the Model 2520 is addressed to talk.
The data string is typically made up of three elements separated by commas. The first
element is the voltage reading, the second is the detector #1 current reading, and the third
is the detector #2 current reading. The NAN (not a number) value of +9.91e37 is used for
a reading that is not available.
Table 2
Basic operating procedure
Procedure
Details
1. Select current source function.
Press CONFIG then LASER I
L
. Choose SHAPE, then select DC or
PULSE. For PULSE mode only, set LOW current, then use PW and
DELAY keys to set pulse width and delay.
2. Set current source level.
Press LASER I
L
then EDIT key to enter edit mode. Use RANGE
▲
and
▼
keys to select source range, then use edit keys to key in
source value, then press ENTER.
3. Set voltage compliance limit.
Press COMPL, then use edit keys to key in limit value, then press
ENTER.
4. Set detector voltage bias levels. Press DETECTOR 1 or DETECTOR 2 V
B
then EDIT key, then use
edit keys to set bias voltage.
5. Select measurement ranges.
Press LASER V
L
, DETECTOR 1 I
PD
, or DETECTOR 2 I
PD
. Use
RANGE
▲
and
▼
keys to set range.
6. Turn on outputs.
Press ON/OFF OUTPUT key. OUTPUT indicator on.
7. Trigger and observe readings.
Press TRIG key. Voltage and current readings are displayed.
8. Turn output off when finished.
Press ON/OFF OUTPUT key. OUTPUT indicator off.
