Keithley 2520 Service Manual page 27

Model 2520 Pulsed Laser Diode Test System Service Manual
12.
Table 1-4
Current measurement verification limits
Model 2520
range
010mA
020mA
050mA
100mA
*Nominal values. Recalculate limits from characterized resistance and
measured voltage: I = V/R.
1
RN60 type 2kΩ.
2
2 RN60 type 2kΩ in parallel.
3
5 RN60 type 2kΩ in parallel.
4
10 RN60 type 2kΩ in parallel.
Figure 1-8
Connections for DETECTOR 2 current measurement verification tests
Model 2001 DMM
Ω2 Ω4
PREV DCV ACV DCI ACI
DISPLAY
NEXT
REL TRIG STORE RECALL FILTER MATH
POWER
INFO LOCAL CHAN SCAN CONFIG MENU
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
connections.)
Test resistor
1
002kΩ
2
001kΩ
3
0400Ω
4
0200Ω
Input HI
SENSE
INPUT
Ω 4 WIRE
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
Resistor
Input LO
(See Text)
Reading limits*
(1 year, 18°C to 28°C)
09.950 to 10.050mA
19.875 to 20.125mA
49.760 to 50.240mA
99.53 to 100.47mA
Center
Conductor
Model 2520 Testhead
BIAS
DETECTOR 1
Inner
Shield
ISOLATION FROM EARTH: 10V MAX.
Performance Verification
. See Figure 1-8
PD
HI LO
CURRENT
OUTPUT
CURRENT
INPUT
!
CAT I
DETECTOR 2
!
VOLTAGE
SENSE
HI LO
DETECTOR 2
1-15
for