5 – Front Panel Operation
58
3. Continue by pressing Shift, Input and ( until you obtain the POINT command.
Press & to select a different buffer size. The choices are: 1, 2, 4, 8, 16, 32, 64,
128, 256, 512, 1024, and 2048. Then press Enter.
One reason to change the front panel time interval and data points is if the
waveform being measured has a period shorter than 3 times the present front
panel acquisition time.
POINT 1024
4. For current measurements, press Shift, Input. Then press & until you obtain the
CURR:RANG AUTO command. Press Enter to activate autoranging. Three
other selections are also available. Select the 3A range when measuring currents
up to 7A. Select the 1A range when measuring currents up to 1A. Select the
0.02A range for improved resolution when measuring currents below 20 mA.
Note that the 0.02A range is only appropriate for making dc measurements.
CURR:RANG AUTO
5. For output waveform measurements, press Shift, Input. Then press ( until you
obtain the CURR:DET command. Check to make sure that the ACDC current
detector is selected. This provides the best accuracy for waveform measurements.
Only select the DC current detector if you are making dc current measurements
and you require a dc measurement offset better than 2mA on the High current
measurement range. Press Enter to activate any changes.
CURR:DET ACDC
7 – Making DVM Measurements (Agilent 66321D/66319D only)
The front panel DVM measurement function is only active when Output 1 is selected.
As shipped from the factory, DVM measurements are calculated from a total of 2048 readings taken at a
15.6 microsecond sampling rate. These parameters are fixed. Therefore, the data acquisition time for a
single measurement is about 30 milliseconds. This sampling rate and data acquisition time combined
with a built-in windowing function reduces errors due to sampling a non-integral number of cycles of a
waveform for frequencies of 47 Hz or greater.
NOTE: If the front panel display indicates OVLD, the output has exceeded the measurement
capability of the instrument. If the front panel display indicates -- -- -- -- -- -- , a front
panel or an GPIB measurement is in progress.
Check that the DVM measurement points are within the DVM measurement capabilities:
The common mode voltage range of the DVM input is −4.5 V to +25 V from either DVM input with
respect to the negative output terminal of output 1. The maximum isolation voltage to ground is ±50 Vdc.
Refer to chapter 3 under "DVM Connection" for more information on how this affects the DVM's
measurement capability.
Use the Meter menu for making DVM measurements:
Action Display
1. On the Function keypad press Meter and press ( repeatedly
to access the following DVM measurement parameters:
♦ dc voltage
♦ rms voltage (ac + dc rms)
1 <reading>V DC:DVM
1 <reading>V RMS:DVM