1-15
(
)
(
)
bandwidth),
and e = input signal rms noise in a 160 MHz bandwidth.
n
1.6.2
Trigger Level Timing Error
1.6.2.1 Timing Error = ±
½ Hysteresis Band
| Input Slew Rate at START Trigger point |
+
½ Hysteresis Band
| Input Slew Rate at STOP Trigger point |
where Hysteresis Band is nominally 25 mV.
1.6.3
Trigger Level Setting Error
1.6.3.1 Setting Error = ±
Trigger Level Accuracy
| Input Slew Rate at START Trigger point |
+
Trigger Level Accuracy
| Input Slew Rate at STOP Trigger point |
1.6.4
Differential Channel Delay Error
1.6.4.1 Differential Channel Delay Error is the difference in propagation times between
signals applied to inputs A and B of the 2251A.
1.6.5
Timebase Error
1.6.5.1 The fractional deviation of the timebase frequency from 10 MHz is due to ageing,
temperature, voltage variations, etc. This is determined by the reference frequency used by
the 2251A. The default reference frequency is the VXIbus CLK10 signal.
1.6.6
Resolution & Gate Time
1.6.6.0.1
Gate time is related to the resolution selected in the Frequency, Period, Ratio, and
Check functions as shown below. Gate time is also programmable in increments of
25.6
F
S. The permitted range is 200
F
S to 99.999 S. The default state is 100 ms gate
time and 8 digits of resolution. Note the gate time may be extended by:
- one period of the input signal on Frequency B and Ratio A/B
- two periods of the input signal on Frequency A and Period A
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