Keithley 2520, Service Manual

Page: 27 / 137

Model 2520 Pulsed Laser Diode Test System Service Manual Performance Verification 1-15
12. After verifying all ranges for DETECTOR 1, repeat the entire procedure for
DETECTOR 2. (Connect the calibrator to the TESTHEAD DETECTOR 2 jack,
and select that channel by pressing DETECTOR 2 I
PD
. See Figure 1-8 for
connections.)
Table 1-4
Current measurement verification limits
Model 2520
range
Test resistor
Reading limits*
(1 year, 18°C to 28°C)
0 10mA 00 2k
Ω
1
0 9.950 to 10.050mA
0 20mA 00 1k
Ω
2
19.875 to 20.125mA
0 50mA 0 400
Ω
3
49.760 to 50.240mA
100mA 0 200
Ω
4
99.53 to 100.47mA
*Nominal values. Recalculate limits from characterized resistance and
measured voltage: I = V/R.
1
RN60 type 2k
Ω
.
2
2 RN60 type 2k
Ω
in parallel.
3
5 RN60 type 2k
Ω
in parallel.
4
10 RN60 type 2k
Ω
in parallel.
Figure 1-8
Connections for DETECTOR 2 current measurement verification tests
NEXT
PREV
POWER
DISPLAY
2001 MULTIMETER
DCV ACV DCI ACI
Ω
2
Ω
4 FREQ TEMP
REL TRIG
INFO LOCAL EXIT ENTER
RANGE
RANGE
!
F R
500V
PEAK
FRONT/REAR
2A 250V
AMPS
CAL
STORE RECALL
CHAN SCAN
FILTER MATH
CONFIG MENU
HI
INPUT
LO
SENSE
Ω
4 WIRE
INPUTS
350V
PEAK
1100V
PEAK
AUTO
CURRENT
OUTPUT
VOLTAGE
SENSE
CAT I
DETECTOR 1 DETECTOR 2
BIAS
CURRENT
INPUT
ISOLATION FROM EARTH: 10V MAX.
HI
HI
LO
LO
!
!
Model 2520 Testhead
Model 2001 DMM
Input HI
Input LO
Inner
Shield
Center
Conductor
DETECTOR 2
Resistor
(See Text)