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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.

T1

T2

T3

T4

Input

Operation

0.655241s