Voltage Bias Source Accuracy - Keithley 2520 Service Manual

1-16 Performance Verification

Voltage bias source accuracy

Follow the steps below to verify that Model 2520 detector voltage bias source accuracy is
within specified limits. This test involves setting the bias voltages to specific values and
measuring the voltages with a DMM.
1.
2.
3.
4.
Figure 1-9
Connections for DETECTOR 1 voltage bias source verification tests
Model 2001 DMM
Ω2 Ω4
DCV ACV DCI ACI
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5.
6.
7.
8.
9.
With the power off, connect the digital multimeter to the Model 2520 testhead
DETECTOR 1 jack, as shown in
Turn on the Model 2520 and DMM, and allow them to warm up for a minimum of
one hour.
Restore BENCH defaults as covered previously in
page 1-6.
Select the DMM DC volts measuring function, and choose auto-range.
Input HI
SENSE
Ω 4 WIRE INPUT
HI
350V 1100V
!
PEAK PEAK
2001 MULTIMETER
LO
500V
PEAK
INPUTS
FREQ TEMP
RANGE
F R
AUTO
FRONT/REAR
2A 250V
AMPS
RANGE
CAL
EXIT ENTER
Input LO
Press the DETECTOR 1 V
+20.000V using the EDIT and or numeric keys.
Press the ON/OFF OUTPUT key to turn on the outputs, then press TRIG.
Verify the DMM reading is within the following limits: 19.75 to 20.25V.
Press the ON/OFF OUTPUT key to turn off the outputs.
Repeats steps 5 through 8 for the DETECTOR 2 bias source (make connections to
the testhead DETECTOR 2 jack as shown in
2 V key to set the output voltage).
B
Model 2520 Pulsed Laser Diode Test System Service Manual
Figure 1-9.
Model 2520 Testhead
Center
Conductor
Triax Cable
BIAS
Inner Shield
DETECTOR 1
ISOLATION FROM EARTH: 10V MAX.
DETECTOR 1
key, press EDIT, then set the source voltage to
B
Figure
"Restoring factory defaults" on
HI LO
CURRENT
OUTPUT
CURRENT
INPUT
!
CAT I
DETECTOR 2
!
VOLTAGE
SENSE
HI LO
1-10, and use the DETECTOR