Performance Test and Calibration - B
81
CR Mode Tests
These tests verify that the module operates in CR mode and the resistance programming is within specification.
The programmed resistance values are checked by recording the voltage across the current monitor resistor and
the input voltage (voltage at the modules + and – sense terminals ), then calculating the resistance as follows;
Load Resistance = Input Voltage / ( voltage across current monitor / monitor resistor value )
Resistance Range 1 Programming Accuracy
1. Connect Electronic Load, Power source and DVM’s as shown in figure B-4. Be sure + sense and – sense are
connected to the +/- input terminals and the remote/local button is in the remote position.
2. Turn on the Electronic Load and press [ Recall ], scroll till display reads *RST and press [ Enter ].
3. Press [ Func ]. Scroll until display reads FUNC RES then press [ Enter ].
4. Press [ RES ]. Scroll until display reads RES:RANG, press [ 1 ] then [ Enter ].
5. Turn on the power source. See power source voltage and current values as listed in following table.
Power Source Voltage Setting
Power Source Current Setting
6. Wait 30 seconds. Checking resistance range 1, high resistance point. Calculate and record resistance on test card.
Input resistance = Input Voltage / ( DVM voltage reading from current shunt/ current shunt resistance).
7. Checking resistance range 1, low resistance point. Reset power source voltage to following values.
Power Source Voltage Setting
Power Source Current Setting
8. Press [ RES ] [ select resistance from following table ] [ Enter ].
9. Wait 30 seconds. Calculate and record resistance range 1, low resistance point.
Resistance Range 2 Programming Accuracy
1. Press [ RES ]. Scroll until display reads RES:RANG. For models N3302A, N3304A, N3305A, and N3306A press [ 9 ]
then [ Enter ]. For models N3303A and N3307A press [ 5 ] [ 0 ] then [ Enter ].
2. Checking resistance range 2, low resistance point. Press [ RES ] [select resistance from following table ] [ Enter ].
3. Set power source voltage and current values as listed in following table.
Power Source Voltage Setting
Power Source Current Setting
4. Wait 15 seconds. Calculate and record resistance range 2 low resistance point.
5. Checking resistance range 2, high resistance point. Press [ RES ] [select resistance from following table ] [ Enter ].
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