4.2 Performance Tests
4 – 3
•
Set the
P
(gain) parameter to
+
8 using
GAIN
8.0
.
•
Turn o
ff
P
control using
PCTL
OFF
.
•
Set the
I
parameter to 10
5
using
INTG
1.0E5
.
•
Turn on
I
control using
ICTL
ON
.
•
Use a short BNC cable to connect the SIM960 Output to the
Measure input.
•
Select “Internal” by pressing [Setpoint] on the front panel.
•
Select “Setpoint” and observe the displayed value. It should
be within
±
10 mV of 0.000 V.
•
Select “Measure”. It should also be within
±
10 mV of 0.000 V.
•
Select “Output”. It should also be within
±
10 mV of 0.000 V.
•
Set the internal setpoint to
+
8.000 V by sending
SETP
+8.0
,
and repeat the previous three steps, each time observing that
the displayed value is within
±
10 mV of
+
8
.
000 V.
•
Set the internal setpoint to
−
8
.
000 V by sending
SETP
-8.0
, and
repeating the same three measurements, each time observing
that the displayed value is within
±
10 mV of
−
8
.
000 V.
•
Now disconnect the Output from the Measure input, and
ground the Measure input using a BNC grounding cap or
50 Ohm terminator.
•
Turn o
ff
I
control using
ICTL
OFF
, and turn on
P
control using
PCTL
ON
. The
P
(gain) parameter should still be 8.0.
•
Change the internal setpoint to 0.000 V using
SETP
0
, and select
the
P
×
ε
display level. The value displayed should be within
±
50 mV of 0.000 V.
•
Now change the internal setpoint to
+
1
.
000 V using
SETP
+1
.
The
P
×
ε
value should be within
±
50 mV of
+
8
.
000 V.
•
Change the internal setpoint to
−
1
.
000 V using
SETP
-1
. The
P
×
ε
value should be within
±
50 mV of -8.000 V.
4.2.3
Proportional Gain Accuracy
Reset the SIM960 via the remote interface using
*RST
. Ground the
Measure input. Connect the Source output of the SR785 to the SR785
Channel 1A input, and to the SIM960 Setpoint input. Connect the
SIM960 ouput to the SR785 Channel 2A input. With the SR785 in
swept sine mode measure the frequency response at 1 kHz, adjusting
SIM960 Analog PID Controller
