HP Saw E4419B Manual do Utilizador descarregar pdf (Página 54)

HP4402.book : chapter2.fm 14 Fri Feb 12 15:32:45 1999

Power Meter Operation

Zeroing and Calibrating the Power Meter

2-14 HP E4419B User’s Guide

Effective control of the zero and calibration cycles using the TTL inputs

depends on correct timing of the input signals as shown in Table 2-3 and

Table 2-4.

Table 2-3: TTL Input Timing Diagram 1

Timing of zero/cal inputs for conditions “01” and “10”.

Time Description Value

T1 Minimum width of input 300 ms

T2 Time between input detection and start of zero/cal

cycle. This is determined by the number of

averages x sample rate, or if there is an existing

zero/cal operation in progress, the time for this

current operation to complete. Note that the

worst case is 1024 averages x 50 ms = 51.2 s. For

front panel operation (in free run mode) the time

is 1 x 50 ms.

Max: 50 ms (typical)

Min: 0 ms

T3 Maximum width of input. Longer inputs may

cause a subsequent zero/cal operation some time

after the current one is complete.

4 s

T4 Time for zero/cal operation to complete. Zero Both: 10 s (each

8480 series sensor), 12 s

(each E series sensor)

Cal: 6 s (8480 series)

7 s (E series)

All timings based on 100 ms ﬁrmware polling.

Input

Operation

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HP Saw E4419B Manual do Utilizador Página 54