User`s guide

B - Verification and Calibration
56
to convert the value to amperes. Record the value. limits (see table B-3, 4, 5 or 6).
5. Set the output current to full scale (see table B-2)..
6. Divide the voltage drop across the current monitor by its resistance
to convert the value to amperes. Record this value and the current
reading on the front panel display.
Readings within high current
limits (see table B-3, 4, 5 or 6).
Current Measurement (Low Range)
Action Normal Result
7. Turn off and connect the dc source as shown in Figure B-1B
using the 400 ohm load resistor. Set the DMM to operate in
current mode.
8. Turn on the dc source, access the Input menu, and set the current
range to LOW.
CURR:RANG LOW
9. Set the output voltage to 0 V and the current to full scale (see
table B-2). Press Output On/Off to enable the output.
Output current near 0 A.
10. Record the current reading from the DMM as well as from the
front panel display. Enter the difference between the two readings
in the appropriate table.
Readings within low current
measurement (see table B-3, 4,
5 or 6).
11. Set the output voltage to 8 V. Output current near +20 mA.
12. Record the current reading from the DMM as well as from the
front panel display. Enter the difference between the two readings
in the table.
Readings within high current
measurement (see table B-3, 4,
5 or 6).
Current Sink Measurement
Action Normal Result
13. Turn off the dc source and connect an external supply to the
output of the unit as shown in figure B-1C using the 400 ohm
load resistor. Set the DMM to operate in current mode.
14. Turn on the dc source, access the Input menu, and set the current
range to LOW.
CURR:RANG LOW
15. Access the Input menu and set the current sense detector to DC. CURR:DET DC
16.
Turn on the external supply and program it to 8 volts and 5 A.
Program the dc source to 0 V and 1 A.
Press Output On/Off to enable the output.
Output current near
−
20 mA.
17. Record the current reading from the DMM as well as from the
front panel display. Enter the difference between the two readings
in the table.
Readings within low current
sink measurement
(see table B-3, 4, 5 or 6).
18. Access the Input menu and set the current range to HIGH. CURR:RANG HIGH
19. Short out the load resistor by connecting a jumper across it.
Output current near −Isink (see
table B-2)
20. Record the current reading from the DMM as well as from the
front panel display. Enter the difference between the two readings
in the table.
Readings within high current
sink measurement
(see table B-3, 4, 5 or 6).