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17-8
3.
4.
klqb
DC volts calibration
After the front panel short and open procedure, the unit will prompt you for the first DC
voltage: +10V. Perform the following:
1.
Figure 17-2
Connections for DC volts and ohms calibration
Model 2790
Model 2790 SourceMeter Switch System
MATH O U T P U T
RATIO
CH AVG
CONT
OCOMP
PERIOD SENSOR
ACI
Ω2
Ω4
SHIFT
DCV
ACV
DCI
DELAY
HOLD
LIMITS
ON/OFF
TYPE
MONITOR
LOCAL
EX TRIG
TRIG
STORE
RECALL
FILTER
REL
POWER
SAVE
SETUP
CONFIG
HALT
TEST
LSYNC
OPEN
CLOSE
STEP
SCAN
DIGITS RATE
SENSE LO
klqb
When the unit is finished with short-circuit calibration, it will display the following
prompt:
OPEN CIRCUIT
Remove the calibration short and press ENTER. During this phase, the
CALIBRATING message will be displayed.
Be sure to minimize movement near front input terminals. Excessive movements
can cause capacitive coupling errors, which could affect calibration accuracy.
Connect the calibrator to the Model 2790 as shown in
utes to allow for thermal equilibrium before proceeding.
SENSE HI INPUT HI
SENSE
Ω 4 WIRE
INPUT
HI
350V
1000V
!
PEAK
PEAK
LO
500V
PEAK
INPUTS
FREQ
TEMP
RANGE
F
R
F
F
CH-OFF
CARD
AUTO
FRONT/REAR
3A 250V
AMPS
RANGE
GPIB
RS-232
EXIT
ENTER
INPUT LO
Although 4-wire connections are shown, the sense leads are connected and dis-
connected at various points in this procedure by turning calibrator external
sense on or off as appropriate. If your calibrator does not have provisions for
turning external sense on and off, disconnect the sense leads when external sens-
ing is to be turned off and connect the sense leads when external sensing is to be
turned on.
Model 2790 SourceMeter
SENSE HI
DC Voltage and Resistance Calibrator
OUTPUT
HI
OUTPUT
LO
SENSE LO
NOTE
Use shielded low-thermal cables to
minimize noise. Enable and disable
calibrator external sense as needed.
®
Switch System Reference Manual
Figure
17-2. Wait three min-
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