18-10 Performance Verification
6. Connect the triax shielding cap to the rear panel INPUT jack.
7. Press ENTER to complete input bias current calibration. The unit will display the fol-
lowing message: CALIBRATING
Volts measurement accuracy
Follow the steps below to verify that Model 6514 volts function measurement accuracy is
within specified limits. The test involves applying accurate DC voltages and then verifying that
Model 6514 voltage readings are within required limits.
WARNING Hazardous voltages are used in the following procedures. Always place the
calibrator in standby before changing test connections.
1. With the power off, connect the voltage calibrator to Model 6514 INPUT jack, as shown
in Figure 18-1. Use the appropriate triax-to-BNC, low-noise coaxial cable, and BNC-to-
dual banana plug adapters where shown.
2. Turn on the power and allow a one-hour warm-up period. Restore factory defaults and
perform offset calibration as outlined above.
3. Select the DC volts function on Model 6514 by pressing the V key, and set the calibrator
to output DC volts.
4. Select Model 6514 2V range with the down RANGE key.
5. Make sure zero check is enabled (press ZCHECK), then zero correct the instrument with
ZCOR. Disable zero check.
6. Set the calibrator voltage to 0.0000V, and turn on the output.
7. Enable REL on Model 6514. Leave REL enabled for the remainder of the test.
RS232DIGITAL 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
Input
Triax-to-BNC Adapter
Model 6514 Electrometer
DC Voltage Calibrator
BNC-to-dual
Banana Plug
Adapter (Connect
Cable Shield to
Output LO)
Calibrator
Output
Low-noise Coax BNC Cable
Figure 18-1
Connections
for volts
verification
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