Keithley 6514, Instruction Manual

Page: 247 / 334

Performance Verification 18-13
8. Repeat the procedure for negative source currents with the same magnitudes as those
listed in Table 18-3.
20pA-2µA range accuracy
1. Connect the voltage calibrator and Model 5156 Electrometer Calibration Standard to
Model 6514 INPUT jack, as shown in Figure 18-3. Initially make connections to the
100G
Ω resistor in the calibration standard.
2. Select the DC amps function on Model 6514, and set the calibrator to output DC voltage.
3. Set Model 6514 to the 20pA range.
4. With zero check enabled, zero correct the instrument, then disable zero check.
5. Set the calibrator voltage to 0.0000V, and make sure the output is turned on.
6. Enable Model 6514 REL mode. Leave REL enabled for the remainder of the test.
Table 18-3
20 µ A-20mA range current measurement accuracy reading limits
Model 6514 range Calibrator current
Model 6514 amps reading limits
(1 Year, 18˚C-28˚C)
20µA 20.0000 µ A 19.9795 to 20.0205 µ A
200 µ A 200.000 µ A 199.795 to 200.205 µ A
2mA 2.00000mA 1.99790 to 2.00210mA
20mA 20.0000mA 19.9795 to 20.0205mA
RS232 DIGITAL I/O
PREAMP
250V PK
2V
OUTPUT
COMMON CHASSIS
120
FUSE LINE
630mA
LINE RATING
50, 60Hz
60 VA MAX
T
(SB)
100 VAC
120 VAC
315mAT
(SB)
220 VAC
240 VAC
INPUT 250V PK
IEEE-488
(CHANGE IEEE
WITH FRONT PANEL MENU)
TRIGGER LINK
!
!
MADE IN
U.S.A.
V, GUARD
(PROGRAMMABLE)
OFF ON
GUARD
(FOLLOWS
INPUT)
(INTERNAL)
INPUT PREAMP
10K
PREAMP
OUT
2V
OUTPUT
COM
Model 6514 Electrometer
DC Voltage Calibrator
BNC-to-dual
Banana Plug
Adapter
Triax Cable
100G Ω
100M Ω
10G Ω
1G Ω 1nF
100nF
OUTPUT
Connect
Cable
Shield to
Output LO
Low-noise
Coax Cable
Note: Connect Calibrator to
Appropriate Resistor,
Link Shield and Chassis.
Model 5156 Calibration Standard
!
Figure 18-3
Connections for
20pA-20µA range
verification