Keysight Technologies 3458A Guide D'utilisation page 200

5 Digitizing
In the following program the input signal is DC-coupled to the level detection
circuitry and consists of a 5 V peak AC signal riding on a –5 V DC level. In this
case, a negative percentage of the range (–25%) is used to level trigger at –2.5 V.
positive slope.
10OUTPUT 722;"PRESET DIG" !DCV DIGITIZING, 10 V RANGE
20OUTPUT 722;"TRIG LEVEL" !LEVEL TRIGGER EVENT
30OUTPUT 722;"SLOPE POS" !TRIGGER ON POSITIVE SLOPE OF SIGNAL
40OUTPUT 722;"LEVEL - 25, DC" !LEVEL TRIGGER AT -25% OF 10 V RANGE
45!DC coupled
50 END
Figure 5-8
Level filtering
When enabled, the level filter function connects a single-pole low-pass filter
circuit to the input of the level-detection circuitry. The low-pass filter has a 3 dB
point of 75 kHz and prevents high frequency components on the input signal from
causing false triggers. To enable level filtering, send:
OUTPUT 722; "LFILTER ON"
The level filter function can also reduce the multimeter's sensitivity to high
NOTE
frequency noise for frequency and period measurements or when making
synchronous (SETACV SYNC) ACV or ACDCV measurements.
200
Figure 5-8 shows the result.
Level triggering, -25%, pos. slope, DC-coupled
Keysight 3458A User's Guide