1-14
1.10 Voltage source verification
Voltage source output accuracy is checked by programming
the voltage source to specific values and measuring the out-
put voltage using a precision digital multimeter.
WARNING
Hazardous voltages will be used in the
following steps. Use caution when work-
ing with hazardous voltages.
Proceed as follows to check the accuracy of the voltage
source.
1. Turn on the Model 6517A and the DMM, and allow both
instruments to warm up for at least one hour before mak-
ing measurements.
Figure 1-7
Connections for ohms verification (2T
Ω
–200T
Ω
ranges)
WARNING:
NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.
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.
CAUTION:
FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.
INPUT
250V PEAK
!
LINE RATING
50-60HZ
50VA MAX
AC ONLY
LINE FUSE
SLOWBLOW
1/2A 90-125V
1/4A 180-250V
IEEE-488
(CHANGE IEEE ADDRESS
WITH FRONT PANEL MENU)
DIGITAL
I/O
TRIG LINK
115V
LO
HI
RS232
!
MADE
IN
U.S.A.
PREAMP OUT
250 PEAK
COMMON
2V ANALOG
OUTPUT
TEMP
TYPE K
HUMIDITY
OPTION SLOT
V SOURCE
EXT TRIG
IN
MTR COMP
OUT
INTERLOCK
SELECTED
LINE VOLTAGE
90-110V
105-125V
180-220V
210-250V
1010V
PEAK
750V
PEAK
Triax Cable
Model 6517 Electrometer
Connect to Center
Conductor
Shielded Characterized Resistor
(See Figure 1-8 for construction details)
Voltage Souce HI
Figure 1-8
Shielded fixture construction
Metal Test
Box
Connect LO to Box
Connect Resistor to HI
Female Triax jack
Characterized Standard
Resistor (1T
Ω
, 10T
Ω
, 100T
Ω
)
Note: Standard resistor must be
properly characterized
(see text)
Female BNC jack
(Teflon Insulated)
Connect LO to Box
2. Set the DMM to the DCV function, and enable auto-
ranging.
3. Temporarily short the ends of the DMM test leads
together, then enable the DMM REL mode. Leave REL
enabled for the remainder of the test.
4. With the Model 6517A voltage source in standby
(turned off), connect the DMM to the Model 6517A
V-SOURCE OUT jacks, as shown Figure 1-9. Be sure
to connect Model 6517A output HI to the DMM input
HI, and output LO to input LO as shown.
5. Program the Model 6517A voltage source for an output
value of 0.000V, and place the voltage source in operate.
6. Verify that the DMM reading is within the limits shown
in the first line of Table 1-10.
7. Repeat steps 5 and 6 for each voltage output value listed
in Table 1-10.
8. Repeat the procedure for negative output voltages with
the same magnitudes listed in Table 1-10.