B - Verification and Calibration

5.Set the output current to its full scale value (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.

Current Measurement (Low Range)

Action

7.Turn off the dc source and connect it as shown in figure B-1B with 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.

9.Set the output voltage to 0 V and the current to its full scale value (see table B-2). Press Output On/Off to enable the output.

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.

11.Set the output voltage to 8 volts.

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 limits (see tables B-3,4, 5 or 6).

Normal Result

CURR:RANG LOW

Output current near 0 A.

Readings within low current measurement (see table B-3, 4, 5 or 6).

Output current near +20 mA.

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 a 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

CURR:RANG LOW

 

current range to 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 its’output for 8 volts

Output current near − 20 mA.

 

and 1 A. Program the dc source to 0 V and 1 A. Press Output

 

 

On/Off to enable the output.

 

17.

Record the current reading from the DMM as well as from the

Readings within low current

 

front panel display. Enter the difference between the two

sink measurement

 

readings in the table.

(see table B-3,4, 5 or 6).

18.Turn off the dc source and connect the current monitor and external supply to the output of the unit as shown in figure B- 1D. Set the DMM to operate in dc voltage mode.

19.

Turn on the external supply and program its’voltage to 5 volts

Output near − full scale current.

 

and current for the full scale current rating of the UUT. Program

 

 

the dc source to 0 V and full scale current (see table B-2). Press

 

 

Output On/Off to enable the output.

 

20.

Divide the voltage drop across the current monitor by its

Readings within high current

 

resistance to convert the value to amperes. Record this value as

sink measurement

 

well as the current reading on the front panel display. Enter the

(see table B-3, 4, 5 or 6).

 

difference between the two readings in the table.

 

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