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16-12
Verifying DC current
Check DC current accuracy by applying accurate DC currents from the DC current cali-
brator to the AMPS input of the Model 2790 and verifying that the displayed readings fall
within specified limits.
Follow these steps to verify DC current accuracy:
1.
2.
3.
4.
Figure 16-3
Connections for Model 2790 DC current verification
Model 2790
Model 2790 SourceMeter Switch System
MATH O U T P U T
RATIO
CH AVG
CONT
OCOMP
PERIOD SENSOR
Ω2
Ω4
SHIFT
DCV
ACV
ACI
FREQ
DCI
MONITOR
DELAY
HOLD
LIMITS
ON/OFF
TYPE
CH-OFF
LOCAL
TRIG
EX TRIG
STORE
RECALL
FILTER
REL
POWER
SAVE
SETUP
LSYNC
CONFIG
HALT
TEST
GPIB
OPEN
CLOSE
STEP
SCAN
DIGITS RATE
EXIT
Connect the Model 2790 AMPS and INPUT LO jacks to the calibrator as shown in
Figure
16-3. Be sure the INPUTS switch is in the FRONT position.
Select the DC current measurement function by pressing the DCI key.
Set the Model 2790 for the 20mA range.
Source positive and negative full-scale currents for each of the ranges listed in
Table 16-4
and verify that the readings for each range are within stated limits.
INPUT LO
SENSE
INPUT
Ω 4 WIRE
HI
350V
1000V
!
PEAK
PEAK
LO
500V
PEAK
INPUTS
TEMP
RANGE
F
F
R
F
CARD
AUTO
FRONT/REAR
3A 250V
AMPS
RANGE
RS-232
ENTER
AMPS
Table 16-4
DCI limits
Applied
DCI range
DC current*
20mA
20.0000mA
100mA
100.0000mA
1A
1.000000A
3A
3.000000A**
* Source positive and negative currents with values shown.
** If the Fluke 5725 amplifier is not available, apply 2.2A from calibrator.
Reading limits for 2.2A input are: 2.197240 to 2.202760A.
Model 2790 SourceMeter
Calibrator (Output DC Current)
OUTPUT
HI
OUTPUT LO
Reading limits
(1 year, 18°C to 28°C)
19.9892 to 20.01080mA
99.9100 to 100.0900mA
0.999160 to 1.000840A
2.99628 to 3.00372A
®
Switch System Reference Manual
NOTE Be sure calibrator is set for
normal current output.
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