18-18 Performance Verification
Coulombs measurement accuracy
Follow the steps below to verify that Model 6514 coulombs function measurement accuracy
is within specified limits. The test involves applying accurate charge values and then verifying
that Model 6514 readings are within required limits.
1. Connect the voltage calibrator and Model 5156 Electrometer Calibration Standard to
Model 6514 INPUT jack, as shown in Figure 18-6. Be sure to use the charge filter as
indicated. Initially, make connections to the 1nF capacitor, and be sure the link between
SHIELD and CHASSIS is installed.
2. Using the GRD key, make sure Model 6514 guard mode is disabled.
3. Select Model 6514 coulombs function by pressing the Q key, and set the calibrator to the
DC volts function.
4. With zero check enabled, zero correct the instrument, then disable zero check.
5. Set the calibrator voltage to 0.0000V, and turn on its output.
6. Enable the REL mode, and 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
Model 6514 Electrometer
DC Voltage Calibrator
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 voltage calibrator
to appropriate capacitor.
Be sure shield LO to chassis
link is connected.
Model 5156 Calibration Standard
!
Change Filter
Adapter
Input
Figure 18-6
Connections for
coulombs
verification
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