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Verification 107
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
Action Normal Result
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
or OUTP ON).
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.
Value within Low Current limits (see applicable test
table).
7
Record the front panel display readback Value within specified readback limits (see
applicable test table).
8 Program output current to full scale.
9
Repeat Steps 6 and 7. Both current readings within specified High Current
and readback limits (see applicable test table).
10
Disable the output (
).
11
Remove the short from across the load.
Table C-4. Operation Verification Test Parameters
Test Description Minimum Spec Results * Maximum Spec Measurement
Uncertainty
Voltage Programming and Readback
Low Voltage (0 V) V
out
-80 mV ____________ mV + 80 mV
2.2
µ
V
Front Panel Display Readback Vout -120 mV ____________ mV Vout +120 mV
2.2
µ
V
High Voltage ( 80 V) V
out
79.888 V _____________V 80.112 V 1 mV
Front Panel Display Readback Vout -160 mV ____________ mV Vout +160 mV 1 mV
Current Programming and Readback
Low Current (0 A) I
out
-25 mA ____________ mA +25 mA
21 µA
Front Panel Display Readback Iout -35 mA ____________ mA Iout +35 mA
21 µA
High Current (30 A) I
out
29.945 A ____________ A 30.055 A 15 mA
Front Panel Display Readback Iout -65 mA ____________ mA Iout +65 mA 15 mA
* Enter your test results in this column.