Keithley 6517 Service Manual page 20

Low-noise Coax BNC Cable
Input
Triax-to-BNC Adapter
WARNING: WARNING:
NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.
NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.
LO
PREAMP OUT COMMON 2V ANALOG
! V SOURCE
250 PEAK OUTPUT
INPUT
750V
250V PEAK
PEAK
HUMIDITY
TEMP
EXT TRIG
TYPE K
IN
RS232
OPTION SLOT
CAUTION: CAUTION:
FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING. FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.
Model 6517 Electrometer
Figure 1-1
Connections for DC volts verification
Model 6517 Electrometer
WARNING: WARNING:
NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY. NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.
LO
PREAMP OUT COMMON 2V ANALOG
!
250 PEAK OUTPUT
INPUT
250V PEAK 750V
PEAK
TEMP HUMIDITY
EXT TRIG
TYPE K
IN
RS232
OPTION SLOT
CAUTION:
CAUTION:
FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING. FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.
Triax Cable
Figure 1-2
Connections for 20pA–2µA range verification
2. Turn on the Model 6517A and the DC calibrator, and
allow a one-hour warm-up period before making mea-
surements.
3. Restore Model 6517A factory default conditions, as
explained in paragraph 1.7.
4. Select the amps function and the 20pA range on the
Model 6517A.
5. With zero check enabled, press REL to zero correct the
instrument.
6. Set the calibrator output to 0.0000V, then disable zero
check. Enable the REL mode to null offsets.
1010V
PEAK
HI
SELECTED MADE
IN
LINE VOLTAGE
U.S.A.
90-110V 180-220V
105-125V 210-250V
LINE RATING LINE FUSE
SLOWBLOW
50-60HZ
50VA MAX 1/2A 90-125V
AC ONLY
1/4A 180-250V
MTR COMP
OUT
IEEE-488
(CHANGE IEEE ADDRESS
WITH FRONT PANEL MENU)
DIGITAL TRIG LINK
I/O
!
INTERLOCK
1010V
PEAK
HI MADE
SELECTED
IN
LINE VOLTAGE
U.S.A.
90-110V 180-220V
V SOURCE
105-125V 210-250V
LINE RATING LINE FUSE
50-60HZ SLOWBLOW
50VA MAX 1/2A 90-125V
AC ONLY
1/4A 180-250V
MTR COMP
OUT
IEEE-488
(CHANGE IEEE ADDRESS
WITH FRONT PANEL MENU)
DIGITAL TRIG LINK
Connect Cable
I/O
!
INTERLOCK
Shield to
Output LO
100GΩ
OUTPUT
1nF
!
100nF
Model 5156 Electrometer Calibration Standard
Calibrator
Output
BNC-to-dual
Banana Plug
Adapter (Connect
Cable Shield to
Output LO)
BNC-to-dual
Banana Plug
Adapter
Low-noise
Coax Cable
10GΩ
Note: Connect Calibrator to
Appropriate Resistor,
Link Shield and Chassis.
1GΩ
100MΩ
7. Record the actual resistance values (see Model 5156 cal-
ibration data) in the appropriate column of Table 1-6.
8. Calculate the actual calibration voltage from the desired
current and the actual value of the 100G Ω resistor as
determined from the calibration data as follows:
Where: I = desired current applied to Model 6517A
V = actual voltage from DC voltage calibrator
R = actual value of calibration standard resistance
Performance Verification
DC Voltage Calibrator
DC Voltage Calibrator
V = IR
1-7