Verifying Resistance; Figure 1-5 Connections For Model 2700 Resistance Verification (100Ω To 10Mω Ranges) - Keithley 2700 Service Manual

Verifying resistance

Check resistance by connecting accurate resistance values to the Model 2700 and verifying
that its resistance readings are within the specified limits.
CAUTION
Follow these steps to verify resistance accuracy:
1.
Figure 1-5
Connections for Model 2700 resistance verification (100Ω to 10MΩ ranges)
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
TRIG
EX TRIG STORE RECALL FILTER REL
POWER
SAVE SETUP LSYNC
CONFIG HALT TEST
CLOSE
OPEN STEP SCAN DIGITS RATE
2.
3.
4.
5.
Do not apply more than 1000V peak between front terminals INPUT HI
and LO or more than 350V peak between SENSE HI and LO, or instru-
ment damage could occur.
Using shielded, Teflon-insulated or equivalent cables in a 4-wire configuration, connect
the Model 2700 INPUT and SENSE jacks to the calibrator as shown in
sure the INPUTS switch is in the FRONT position.
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
Set the calibrator for 4-wire resistance with external sense on.
Select the Model 2700 4-wire resistance function by pressing the Ω4 key, then choose
the SLOW integration rate with the RATE key.
Set the Model 2700 for the 100Ω range, and make sure the FILTER is on. Enable
OCOMP (offset-compensated ohms) for 100Ω range verification. (Press SHIFT then
OCOMP.)
Recalculate reading limits based on actual calibrator resistance values.
Sense HI
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.
Performance Verification
Figure
Resistance Calibrator
1-13
1-5. Be