B&K Precision 4078 - Manual - Manual (Page 38)

𝑟𝑎𝑡𝑒 =
1
1000 𝑝𝑡𝑠 ∙ 1000 𝐻𝑧 = 1 𝜇𝑠
EXAMPLE: Setting the Output Frequency
To set the output frequency of a 1000 point waveform in execution memory to 1000 Hz, set the rate to 1 µs:
ACTION KEYSTROKES
Step 1. Set the output rate to 1 µs (equivalent to PARAMETER
1000 Hz output frequency) F1 :RATE
1
KHz/us
3.14.4 Setting the Amplitude
The following equation represents the relative output amplitude voltage relationship between the front-panel amplitude
peak-to-peak setting and the data point values in waveform memory:
𝑜𝑢𝑡𝑝𝑢𝑡 𝑣𝑜𝑙𝑡𝑎𝑔𝑒 =
𝐴𝑚𝑝𝑙𝑖𝑡𝑢𝑑𝑒 𝑝 − 𝑝 𝑠𝑒𝑡𝑡𝑖𝑛𝑔 ∙ 𝑑𝑎𝑡𝑎 𝑝𝑜𝑖𝑛𝑡 𝑣𝑎𝑙𝑢𝑒
16382
+ 𝑜𝑓𝑓𝑠𝑒𝑡
Where 16382 is the total data point value range in waveform memory.
Table 3-4: Relative Amplitude for Waveform Output (Examples)
Front Panel
Amplitude Setting
Data Point Value Relative Output
Amplitude Voltage
5 V peak-to-peak 8191 2.5 V positive peak
5 V peak-to-peak 0 0 V (offset voltage)
10 V peak-to-peak -8191 5 V positive peak
3.14.5 Executing an Arbitrary Waveform
To load a waveform into execution memory, specify its starting address and length in the ARB menu.
1. Select the channel to ON.
2. Press the ARB key and select the F2:ARB function.
3. Press F1:START to set the address. Valid entries range from 1 to 399,999.
Note: The starting address always has to be an odd number. If an even number is entered, it will automatically
decrement one value to an odd number. For example, if you set start address to 2000 and press ENTER, it will
display 1999.
4. Press F2:LENGTH to set the length of the waveform.
5. Use the rotary input knob or the numerical keypad to enter the waveform length. Valid entries range from 2 to
400,000.
Note: The length value must always be an even number. If you input an odd number length, a message will pop
up and say “Even wave length” and then decrement one value to an even number. For example, if you entered
1001 as the length, the message will pop up for one second and change the value automatically to 1000.