Keithley 7999-2, Инструкция по эксплуатации

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4-4 Service Information
Multiplexer card connections
Test equipment connection diagrams in this section are generic in nature and are intended
only to show basic connections on how to connect test equipment to the relay contact(s) under
test. See Section 2 for complete details on card connections and terminal designations.
Channel resistance tests
Perform the following steps to verify that each contact of every relay is closing properly and
that the channel resistance is within specification.
1. Turn on the Model 2010 DMM, and allow it to warm up for one hour before making
measurements.
2. Set the Model 2010 to the 10
Ω
range, and connect the four test leads to the INPUT and
SENSE
Ω
4 WIRE jacks.
3. Short the free ends of the four test leads together, and enable REL on the Model 2010 to
null out residual resistance. Leave REL enabled for the entire test.
4. Connect the Model 2010 INPUT and SENSE
Ω
4 WIRE jacks to the relay contact to be
tested, as shown in Figure 4-1. Note that 4-wire connections to the card terminals are
used.
5. Close the relay being tested.
6. Note the resistance reading on the Model 2010, and verify that it is <1
Ω
.
7. Open the relay being tested.
8. Repeat steps 4 through 7 for every relay contact on the card.
2010 MULTIMETER
RANGE
!
F
500V
PEAK
FRONT/REAR
3A 250V
AMPS
HI
LO
INPUTS
350V
PEAK
1000V
PEAK
SHIFT
LOCAL
POWER
RANGE R
SHIFT
CH1 REM
TALK
LSTN
SRQ
STAT REL FILT
4W
BUFFER
MATH
REAR SCAN
TIMER
STEP CH2 CH3 CH4 CH5 CH6 CH7 CH8 CH9 CH10
HOLD TRIG FAST MED SLOW AUTO ERR
INPUT
SENSE
Ω
4 WIRE
AUTO
EXIT ENTER DIGITS RATE
REL FILTER TRIG EX TRIG STORE RECALL
OPEN CLOSE
DCV
DCI
MX+B
%
dBm
ACV ACI
Ω
2
Ω
4 FREQ
TEMP
dB CONT PERIOD SENSOR
LIMITS ON/OFF DELAY HOLD
SAVE SETUP CONFIG HALT
TYPE
RS232 GPIB
RATIO
STEP SCAN
DRYCKT O COMP
CAL TEST
Model 2010 DMM
Connect to INPUT and SENSE
In
Out
H
L
G
Close
Relay
Model 7999-2 Relay
Under Test. See Section 2
for Detailed Connections.
Figure 4-1
Channel resistance
test connections