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Current Programming and Readback Accuracy
This test verifies that the current programming and readback are within specification. Connect the appropriate current
monitoring resistor (see Table C-1) as shown in Figure C-1(2). The accuracy of the resistor must be as specified in the table.
Table C-3. Current Programming and Readback Accuracy Test
1
Turn off the power supply and connect the current monitoring
resistor as shown in Figure C-1(2). Be certain to use wire of
sufficient size to carry the maximum rated current of the
unit (see Table 7-1 in Chapter 7).
2
Connect a DVM across the resistor at the monitoring
terminals.
3
Turn on the power supply and program the output for 5V, 0A.
4
Disable the output (
5
Enable the output
6
Observe the DVM voltage reading. Divide this by the
resistance of the current monitor resistor. Record the result as
the Low Current value in applicable test table.
7
Record the front panel display readback
8
Program output current to full scale.
9
Repeat Steps 6 and 7.
10
Disable the output (
11
Remove the short from across the load.
Test Description
Low Voltage (0 V) V
out
Front Panel Display Readback
High Voltage ( 80 V) V
out
Front Panel Display Readback
Low Current (0 A) I
out
Front Panel Display Readback
High Current (30 A) I
out
Front Panel Display Readback
Action
)
or OUTP ON).
).
Table C-4. Operation Verification Test Parameters
Minimum Spec
Voltage Programming and Readback
-80 mV
____________ mV
Vout -120 mV
____________ mV
79.888 V
_____________V
Vout -160 mV
____________ mV
Current Programming and Readback
-25 mA
____________ mA
Iout -35 mA
____________ mA
29.945 A
____________ A
Iout -65 mA
____________ mA
* Enter your test results in this column.
Value within Low Current limits (see applicable test
table).
Value within specified readback limits (see
applicable test table).
Both current readings within specified High Current
and readback limits (see applicable test table).
Results *
Maximum Spec
+ 80 mV
Vout +120 mV
80.112 V
Vout +160 mV
+25 mA
Iout +35 mA
30.055 A
Iout +65 mA
Normal Result
Measurement
Uncertainty
2.2 µV
2.2 µV
1 mV
1 mV
21 µA
21 µA
15 mA
15 mA
Verification
107
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