Figure 2-2 Connections For Dc Volts And Ohms Calibration - Keithley 2700 Service Manual

2-8 Calibration
2.
3.
4.
NOTE
DC volts calibration
After the front panel short and open procedure, the unit will prompt you for the first DC
voltage: +10V. Do the following:
1.
Figure 2-2
Connections for DC volts and ohms calibration
Model 2700
Model 2700 Multimeter / Data Acquisition System
CONT OCOMP
MATH O U T P U T RATIO CH AVG
Ω2 Ω4
SHIFT DCV ACV DCI ACI
DELAY HOLD LIMITS ON/OFF TYPE MONITOR
LOCAL
EX TRIG TRIG STORE FILTER REL
RECALL
POWER
SAVE SETUP LSYNC
CONFIG HALT TEST
OPEN CLOSE
STEP SCAN DIGITS RATE
NOTE
2.
Press ENTER to start short-circuit calibration. While the unit is calibrating, it will
display:
CALIBRATING
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 2700 as shown in
allow for thermal equilibrium before proceeding.
Sense HI
Integra Series
SENSE
INPUT
Ω 4 WIRE
HI
350V 1000V
!
PEAK PEAK
LO
500V
PERIOD SENSOR
PEAK
INPUTS
FREQ TEMP
RANGE F R
CH-OFF CARD
AUTO
FRONT/REAR
3A 250V
AMPS
RANGE
RS-232
GPIB
EXIT ENTER
Sense LO
Although 4-wire connections are shown, the sense leads are connected and discon-
nected 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 sensing is to be turned off,
and connect the sense leads when external sensing is to be turned on.
Set the calibrator to output DC volts, and turn external sense off.
Sense HI
DC Voltage and Resistance Calibrator
Input
HI
Output
HI
Input Output
LO
LO
Sense LO
Note: Use shielded low-thermal cables to minimize noise.
Enable or disable calibrator external sense as
indicated in procedure.
Figure 2-2. Wait three minutes to