Keithley 2701, Service Manual

Page: 56 / 168

2-10 Calibration Model 2701 Service Manual
DC current calibration
After the 1M
Ω
resistance point has been calibrated, the unit will prompt you to apply 10mA.
Follow these steps for DC current calibration:
1. Connect the calibrator to the AMPS and INPUT LO terminals of the Model 2701 as
shown in
Figure 2-3 .
Figure 2-3
Connections for DC and AC amps calibration
2. Calibrate each current step summarized in Table 2-5 . For each step:
• Set the calibrator to the indicated DC current and make sure the unit is in
OPERATE.
• Make sure the Model 2701 display indicates the correct calibration current.
• Press ENTER to complete each step.
• Allow the Model 2701 to finish each step.
NOTE If you are performing DC-only calibration, proceed to “Setting calibration dates
and saving calibration.”
Table 2-5
DC current calibration summary
Calibration step Calibrator current Allowable range
10mA
100mA
1A 10.00000mA
100.0000mA
1.000000A 9mA to 11mA
90mA to 110mA
0.9A to 1.1A
!
Model 2701 Ethernet Multimeter / Data Acquisition System
RANGE
F
500V
PEAK
FRONT/REAR
3A 250V
AMPS
HI
INPUT
LO
SENSE
Ω
4 WIRE
INPUTS
350V
PEAK
1000V
PEAK
AUTO
SHIFT
LOCAL
POWER
RANGE R
EXIT ENTER DIGITS RATE
REL FILTER TRIG EX TRIG STORE RECALL
OPEN
DCV DCI
MATH O U T P U T RATIO
ACV ACI
Ω
2
Ω
4 FREQ TEMP
CH AVG CONT PERIOD SENSOR
LIMITS ON/OFF DELAY HOLD
SAVE SETUP
CONFIG HALT
TYPE
LSYNC
TEST
MONITOR
STEP SCAN
OCOMP
CH-OFF CARD
CLOSE
Integra Series
RS-232 ETHERNET
Note: Be sure calibrator is set for
AMPS
normal current output.
Model 2701
INPUT LO
OUTPUT
HI
OUTPUT
LO
DC and AC Current Calibrator
CAT I