Acquire The Data - HP 1660C Series Service Manual

Testing Performance
To test the voltage measurement accuracy (oscilloscope)

Acquire the data

Use the following table for steps 1 through 5.
Oscilloscope Settings
V/Div Offset
4 V/Div -7.0 V
1 V/Div -1.75 V
400 mV/Div -700.0 mV
40 mV/Div -70.0 mV
40 mV/Div 70.0 mV
400 mV/Div 700.0 mV
1 V/Div 1.75 V
4 V/Div 7.0 V
Set up the oscilloscope according to the table above.
1
a Press the Chan key.
b Move the cursor to the V/Div field, then use the RPG knob to dial in the V/Div values
shown on the first line of the table.
c Move the cursor to the Offset field. Use the front-panel keyboard to enter the offset
value shown on the first line of the table. Use the left and right cursor-control keys to
select either mV or V.
Acquire the zero input voltage.
2
a Disconnect the power supply from the channel input.
b Press the blue shift key, then press the Run key. Wait for approximately five seconds
(averaging complete), then press Stop.
c Press the Markers key. Move the cursor to the Va Volts field. Using the RPG knob,
move the Va marker over the oscilloscope trace on the display.
Acquire the measured voltage.
3
a Connect the power supply to the channel input. Set the power supply voltage
according to the first line of the table above.
b Press the blue shift key, then press the Run key. Wait for approximately five seconds
(averaging complete), then press Stop.
c Press the Markers key. Move the cursor to the Vb Volts field. Using the RPG knob,
move the Vb marker over the oscilloscope trace on the display.
d Record the voltage in the Va to Vb field in the performance test record.
Repeat steps 1 through 3 for the second line of the table, then for the rest of the lines
4
of the table for channel 1.
Repeat from "Set up the logic analyzer" for channel 2, replacing channel 1 with
5
channel 2 where applicable.
3–76
Voltage Readings
Supply Upper Limit
-14.0 V -13.7 V
-3.50 V -3.43 V
-1.40 V -1.37 V
-140.0 mV -137.0 mV
140.0 mV 143.0 mV
1.40 V 1.43 V
3.50 V 3.57 V
14.0 V 14.3 V
Lower Limit
-14.3 V
-3.57 V
-1.43 V
-143.0 mV
137.0 mV
1.37 V
3.43 V
13.7 V