Keithley 2308, Руководство пользователя

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2308-900-01 Rev. A / July 2008 Return to Section Topics 12-15
Model 2308 Portable Device Battery/Charger Simulator User’s Manual Section 12: Performance Verification
Digital voltmeter input accuracy
Follow the steps below to verify the digital voltmeter input accuracy is within specified limits. The
test involves setting the voltage applied to the DVM input to accurate values and then verifying that
the digital voltmeter input readings are within required limits.
1. With the power supply’s output off, connect the OUTPUT #2 DVM IN, SOURCE, and
SENSE terminals to the digital multimeter, as shown in Figure 12-6 . Be sure to observe
proper polarity (DVM IN +, and, SENSE + to DMM INPUT HI; also DVM IN -,
SOURCE -, and SENSE - to DMM INPUT LO).
Figure 12-6
Charger channel connections for DVM accuracy verification
2. Select the DMM DC volts function, and enable auto-ranging.
3. Press the or keys to select Channel #2 . Enable the DVM input.
4. Turn on the source output.
5. Verify digital voltmeter input accuracy for each of the voltages listed in Table 12-9 . For each
test point:
6 V 2.0000 mA 1.9950 to 2.0050 mA
9 V 3.0000 mA 2.9930 to 3.0070 mA
12 V 4.0000 mA 3.9910 to 4.0090 mA
14.7 V 4.9000 mA 4.8892 to 4.9108 mA
Table 12-8
5 mA range current readback accuracy limits
*
Nominal output
Voltage Model 2308
output current
**
Current readback limits
(2 Years, 18°C-28°C)
*Check the complete Model 2308 Specifications at www.keithley.com for updated
current readback accuracy limits before verification.
** As measured by digital multimeter voltage reading and 3 k
Ω
resistance value.
WARNING:
NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.
CAUTION:
FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.
MADE IN
U.S.A.
LINE RATING
100-120VAC, 200-240VAC
50, 60 HZ 165VA MAX
LINE FUSE
SLOWBLOW
2.0A, 250V
IEEE-488
(ENTER IEEE ADDRESS
FROM FRONT PANEL MENU)
REMOTE
DISPLAY
OPTION
+ + + _
_ _
SOURCE SENSE SOURCE
OUTPUT #1
ISOLATION FROM EARTH: 22 VOLTS MAX MAX.
RELAY
CONTROL
24VDC MAX
DVM IN
-30 VDC MAX
ANALOG
OUT
mA
(5/50)
A
(0.5/5)
+ + + _
_ _ _
+
SOURCE SENSE DVM IN SOURCE
OUTPUT #2
NEXT
PREV
POWER
DISPLAY
2001 MULTIMETER
DCV ACV DCI ACI ý2 ý4 FREQ TEMP
REL TRIG
INFO LOCAL EXITENT ER
RANGE
RANGE
!
F R
500V
PEAK
FRONT/REAR
2A 250V
AMPS
CAL
STORE RECALL
CHAN SCAN
FILTER MATH
CONFIG MENU
HI
INPUT
LO
SENSE
ý 4 WIRE
INPUTS
350V
PEAK
1100V
PEAK
AUTO
Model 2001 DMM
Model 2308
Input LO
Input HI
Source -
DVM IN -
DVM IN +
Sense + Sense -
▲
▲