Keysight N6705 Service Manual page 17

Model N6705 Service Guide
3
Set the N6784A that is being used as the load as follows:
a. Emulation Mode = CC Load (in current priority mode)
b. + Voltage limit = 6.12 V
c. Current Slew setting:
N678xA: Maximum (the default)
N6783A: 67500 A/s (for a pulse rise/fall time of 20 µs)
d. Arb = Current Pulse
e. Load pulse properties:
N678xA: I = −0.1 A; I
0
N6783A: I = −0.15A; I
0
f. Continuous = ON
g. Press Arb run.
4
Adjust the oscilloscope for a waveform similar to that shown in the
following figure.
5
The output voltage should return to within the specified voltage at
the specified time following the 50% load change. Check both
loading and unloading transients by triggering on the positive and
negative slope. Record the voltage at time "t" in the performance
test record form under "Transient Response".
6
For models N6781A, N6782A, and N6784A only. Repeat steps 3
through 5 for the 20 V range. Program the instrument settings as
described on the test record form under "Transient Response 20 V".
Change the settings of the N6784A that is being used as the load as
follows:
b. + Voltage limit = 20.4 V
e. Load pulse properties:
N678xA: I = −0.1 A; I
0
Auxiliary Voltage Measurement Accuracy (N6781A/N6785A only)
Test category = performance
This test verifies the auxiliary voltage measurement accuracy.
1
Turn off the DC Power Analyzer and connect the external DMM and
an external power supply to the auxiliary voltage inputs (see Test
Setup E).
2
Turn on the external power supply and set the output to 20 V. Turn
on the DC Power Analyzer. Select Meter View, Properties, and then
select the Aux Voltage measurement input.
3
Record the external DMM reading and the auxiliary DVM readings.
The auxiliary voltage reading should be within the designated
voltage limit indicated in the test record form under "Auxiliary
Voltage Readback".
4
Reverse the leads of the external power supply and repeat step 3.
Performance Verification
= −1.5A; T = 1ms; T = 1ms; T
1 0 1
= −1.5A; T = 0.5ms; T = 0.5ms; T
1 0 1
Loadi ng
T ransi ent
tttt
t
v
v
t
U nl oadi ng
T ransi ent
= −0.9A; T = 1ms; T = 1ms; T
1 0 1
2
= 1ms
2
= 0.5ms
2
= 1ms
2
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