2-11
Step 5: Coulombs Calibration
1. Connect the calibration standard and DC voltage cali-
brator to the Model 6517A INPUT jack, as shown in
Figure 2-5. Initially, make connections to the 1nF capac-
itor in the standards box.
2. Set the output voltage of the DC calibrator to 0.00000V.
3. Press the ENTER key to begin zero check A calibration.
During this step, the instrument will display:
Performing 2nC zero check A cal
4. After zero cal, the instrument will display the following:
CONNECT 2V to 1000pF
ENTER to continue; EXIT to abort
5. Press the ENTER key, and note that the instrument dis-
plays the actual calibration value:
+1.9000000 V
Use
▲
,
▼
, , ,ENTER,EXIT
or
INFO
6. Set the DC calibrator voltage to +1.9000000V DC. If
necessary, set the displayed calibration value to agree
with the actual calibrator voltage, then press the ENTER
key. During this step, the instrument will display the
following:
Performing 2 nC cal
Figure 2-5
Connections for coulombs calibration
WARNING:
NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.
WARNING:
NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.
CAUTION:
FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.
CAUTION:
FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.
INPUT
250V PEAK
!
LINE RATING
50-60HZ
50VA MAX
AC ONLY
LINE FUSE
SLOWBLOW
1/2A 90-125V
1/4A 180-250V
IEEE-488
(CHANGE IEEE ADDRESS
WITH FRONT PANEL MENU)
DIGITAL
I/O
TRIG LINK
115V
LO
HI
RS232
!
MADE
IN
U.S.A.
PREAMP OUT
250 PEAK
COMMON
2V ANALOG
OUTPUT
TEMP
TYPE K
HUMIDITY
OPTION SLOT
V SOURCE
EXT TRIG
IN
MTR COMP
OUT
INTERLOCK
SELECTED
LINE VOLTAGE
90-110V
105-125V
180-220V
210-250V
1010V
PEAK
750V
PEAK
Low-noise
Coax Cable
Model 6517 Electrometer
Connect Cable
Shield to
Output LO
DC Voltage Calibrator
Note: Connect voltage calibrator
to appropriate capacitor.
Be sure shield to chassis
link is connected. (See Text)
Triax Cable
100G
Ω
1nF
100nF
10G
Ω
1G
Ω
100M
Ω
Model 5156 Electrometer Calibration Standard
OUTPUT
Charge Filter
!
7. Set the calibrator output to 0V, then press the ENTER
key to automatically perform 2nC zero check B
calibration.
8. After zero check calibration, the instrument will prompt
you for the next calibration step:
CONNECT -2V to 1000p
ENTER to continue; EXIT to abort
9. Set the DC voltage calibrator to -1.900000V, and allow
sufficient time for settling.
10. Press the ENTER key, and note that the instrument dis-
plays the exact calibration value:
-1.9000000 V
Use
▲
,
▼
, , ,ENTER,EXIT
or
INFO
11. If necessary, adjust the display to agree with the exact
calibration value.
12. Press the Model 6517A ENTER key. During this cali-
bration phase, the instrument will display the following:
Performing -2nC cal
13. Repeat steps 4 through 12 for the remaining coulombs
ranges using the voltage values and capacitance stan-
dards values summarized in Table 2-6.