Model 6485 Instruction Manual Calibration 16-9
Figure 16-1
Connections for 20
µ
A to 20mA range calibration
2nA-2µA range calibration
1. Connect the voltage calibrator and the Model 5156 Electrometer Calibration Stan-
dard to the Model 6485 INPUT jack, as shown in Figure 16-2. Initially, make con-
nections to the 1GΩ resistance.
2. Set the calibrator to output volts, and make sure the calibrator output is turned on.
3. Select the Model 6485 2nA range.
4. Press MENU, select CAL, then press ENTER. At the CAL: RUN prompt, press
ENTER again. The unit will prompt for the zero calibration point:
2NA ZERO
5. Set the calibrator voltage to 0V then press ENTER.
6. The instrument will prompt for the positive full-scale calibration point:
+2NA CAL
7. Press ENTER. The instrument will prompt for the positive full-scale calibration
current:
+2.000000 NA
8. Set the calibrator voltage to +2.000000V. Calculate the actual calibration current
from the calibrator voltage and the actual standard resistor value: I = V/R. Adjust
the Model 6485 display to agree with the calculated current, then press ENTER.
9. The Model 6485 will prompt for the negative full-scale calibration point:
-2NA CAL
10. Press ENTER. The instrument will prompt for the negative full-scale current:
-2.000000 NA
120
FUSE LINE
630mA
LINE RATING
50, 60Hz
30 VA
T
(SB)
100 VAC
120 VAC
315mAT
(SB)
220 VAC
240 VAC
!
INPUT
INPUT
C
O
M
M
O
N
!
42V PK
220V PK
MADE IN
U.S.A.
(CHANGE IEEE ADDRESS
WITH FRONT PANEL MENU)
IEEE-488
CAT
TRIGGER LINK
RS-232
ANALOG OUT
INPUT
Model 6485 Picoammeter
DC Current Calibrator
BNC-to-dual
Banana Plug
Adapter (Connect
Cable Shield to
Output LO)
Low-noise Coax BNC Cable
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