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Digitizers Verification Tests 157Appendix D
Filter Bandwidth
Verification Test
This test checks the filter input bandwidth for the 25 kHz filter on the E1563A
or each of the four filters (1.5 kHz, 6 kHz, 25 kHz and 100 kHz) on the
E1564A. The test This test uses an external source connected to the HI and
LO Input terminals and has the "L" terminal connected to the "G" terminal.
The digitizer is set to the 1V range for all tests.
1 Set the digitizer as follows: Reset the digitizer: RST
Set all channels to 1V range: VOLT1:RANG 1; VOLT2:RANG 1; etc.
Set input filter frequency to 25 kHz: INPut1:FILTer:FREQ 25e3;
INPut2:FILTer:FREQ 25e3
Enable the input filter: INPut1:FILTer:STATe ON; INPut2:FILTer:
STATe ON
2 Set the AC Standard output to 0.95V @ 25 kHz and connect the
standard to the digitizer’s channel 1.
3 Perform the filter bandwidth measurement using INITiate. Retrieve
the reading using DATA? 1,(@1). Record the result on the
Performance Test Record and verify the result is within specified
limits.
4. Move the AC Standard output to the channel 2 input. Perform the
filter bandwidth measurement using INITiate. Retrieve the reading
using DATA? 1,(@2). Verify the result is within specified limits and
record the result.
5 Repeat Steps 2 through 4 for channels 3 and 4 on the E1564A
4-Channel Digitizer using: VOLT3:RANG 1, INPut3:FILTer:
FREQ 25e3, INPut3:FILTer:STATe ON, VOLT4:RANG 1,
INPut4:FILTer:FREQ 25e3, INPut4:FILTer: STATe ON.
6 E1564A 4-Channel Digitizer: Test the remaining three filters present
on the E1564A 4-Channel Digitizer. Repeat steps 2 through 5 for the
remaining three input frequencies in Table D-5 for channels 3 and 4.
NOTE This requires you change input filters before you begin testing by executing
the INPut<channel>:FILTer:FREQ <filter_frequency> command. Also,
Step 3 requires DATA? 1,(@3) and Step 5 requires DATA? 1,(@4).
Table D-5. Filter Bandwidth Verification Test Points.
E1563A RANGE INPUT INPUT FREQ Error from input value
1V 1 V 25 kHz -3 dB ±2 dB
E1564A RANGE INPUT INPUT FREQ Error from input value
1V 1 V 25 kHz -3 dB ±2 dB
1V 1 V 1.5 kHz -3 dB ±2 dB
1V 1 V 6 kHz -3 dB ±2 dB
1V 1 V 100 kHz -3 dB ±2 dB