Product specifications

Table 1 shows theoretical values of the data-acquisition time-per-point and

timing resolution for each IF bandwidth. These represent the minimum pulse

width for wideband point-in-pulse and timing resolution for wideband pulse

profile respectively. The minimum timing resolution can also be found on the

PNA-X display by setting CW time sweep and dividing sweep time by the

number of points. In other words, the length of pulse profile can be set by

number of points, up to 32001 points in PNA-X standard operation mode. Note

that the maximum number of points with DSP version 4 is limited by 1001 points

with 1 MHz or wider IF bandwidth. Thus the maximum length of pulse profile is

(timing resolution) * (1001 points) in this case, instead of (timing resolution) *

(32001 points).

In practice, the minimum pulse width for wideband point-in-pulse is affected by

pulse rise and fall time, the alignment of pulses and data acquisition window,

and is determined based on measurement accuracy requirements. When one

of the few sampled data points falls outside of the pulse, the error becomes

considerably large. However, the number of samples increases with narrower

IF bandwidth and missing one of many samples causes a relatively small error,

which may be acceptable.

Table 1. Minimum pulse width (point-in-pulse) and timing resolution (pulse profile) in

wideband pulse measurements

IF bandwidth (kHz)

Wideband point-in-pulse

minimum pulse width (ns)

Wideband pulse proﬁle

minimum timing resolution (ns)

DSP version 4 DSP version 5 DSP version 4 DSP version 5

100 10650 14520 10650 7260

150 7100 9680 7100 4840

200 4733 7260 4733 3630

280 3550 5160 3550 2580

360 2367 4420 2367 2410

600 1183 3620 2367 2410

1000 1433 1440 717 720

1500 933 960 467 480

2000 700 720 350 360

3000 467 500 233 250

5000 267 300 133 150

7000 n/a 200 n/a 100

10000 n/a 140 n/a 70

15000 n/a 100 n/a 50