Verifying Dc Current; Dci Limits - Keithley 2015 Service Manual

1-12 Performance Verification

Verifying DC current

Check DC current accuracy by applying accurate DC currents from the DC current calibrator
to the AMPS input of the Model 2015 and verifying that the displayed readings fall within spec-
ified limits.
Follow these steps to verify DC current accuracy:
1.
Figure 1-3
Connections for DC current verification
Model 2015
REM STEP SCAN CH1 CH2 CH3 CH4 CH5 CH6 CH7
TALK
LSTN
SRQ
SHIFT
TIMER
HOLD TRIG FAST MED SLOW REL FILT AUTO ERR
MATH T H D dBm dB CONT
Ω2 Ω4
DCV ACV ACI
SHIFT DCI
DELAY HOLD LIMITS ON/OFF TEST CAL
LOCAL
TRIG
EX TRIG STORE RECALL FILTER REL
POWER
SAVE SETUP RS232
CONFIG HALT GPIB
SOURCE MEAS
STEP SCAN DIGITS RATE
THD
2.
3.
4.
Table 1-4

DCI limits

DCI
range
10mA
100mA
1A
3A
*Source positive and negative currents with values shown.
Connect the Model 2015 AMPS and INPUT LO jacks to the calibrator as shown in
Figure 1-3.
SENSE
INPUT
Ω 4 WIRE
HI
CH8 CH9 CH10 MATH
REAR
4W
350V 1000V
BUFFER STAT !
PEAK PEAK
2015 THD MULTIMETER
LO
500V
PERIOD TCOUPL
PEAK
INPUTS
FREQ TEMP
RANGE F R
AUTO
FRONT/REAR
3A 250V
AMPS
RANGE
EXIT ENTER
Select the DC current measurement function by pressing the DCI key, then choose the
SLOW integration rate with the RATE key.
Set the Model 2015 for the 10mA range.
Source positive and negative full-scale currents for each of the ranges listed in Table
1-4, and verify that the readings for each range are within stated limits.
Applied DC current*
10.0000mA
100.0000mA
1.000000A
2.20000A
Input
LO
Output HI
Amps
Output
Note: Be sure calibrator is set for
LO
normal current output.
Reading limits (1 year, 18°C-28°C)
9 .99460 to 10.00540mA
99.9100 to 100.0900mA
0.999160 to 1.000840A
2.197315 to 2.202685A
DC Current Calibrator