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2-6
Getting Started
Instrument setup
Detector voltage bias, current measurement polarity, and range
Using a reverse bias on the 2520INT is critical for good pulse measurement performance.
The reverse bias reduces the capacitance of the detector in the 2520INT, which greatly
speeds up the reaction time, permitting the 2520INT to respond to the 100 ns (or less) rise
time of the Model 2520's pulses. The recommended bias is -5V. The necessary trade off
for using the bias is an increase in the dark current. See the following information for dark
current measurement and compensation.
The 2520INT is configured to output positive current to the 2520. Since the Model 2520
detector channels are unipolar, the channel utilized for the 2520INT must have its polarity
set to positive. For most applications, the 2520INT will output <10mA, so the current
measure range on the Model 2520 should be set to 10 mA.
Configuring the Model 2520 voltage bias for Model 2520INT
1. Press V
2. Use the
3. Use the
4. Press ENTER when correct value is displayed.Voltage is applied to detector chan-
Configuring the Model 2520 detector polarity for the Model 2520INT
1. Press CONFIG then V
2. Use the
3. Press ENTER.
Configuring the Model 2520 detector current measurement range for
the Model 2520INT
1.
2.
Remote instrument setup
The Model 2520 can be set up for remote detector bias and detector current measure polar-
ity by using the commands summarized in the Table 2-1.
for the detector channel connected to the 2520INT.
B
and
keys to move the blinking value to the desired position.
and
keys to set the voltage to –05.00V.
nel only when the Model 2520 output is on.
for the desired channel (DETECTOR 1 or DETECTOR 2).
B
and
keys to make POSITIVE the blinking value.
Press IPD for the detector channel connected to the 2520INT.
Press the RANGE
key until the 10mA range is reached.
Model 2520INT Quick Start Guide
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