Table 2-3 Ttl Input Timing Diagram 1 - Agilent Technologies E4418B User Manual

2 Power Meter Operation
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-
36
4.

Table 2-3 TTL Input Timing Diagram 1

Timing of zero/cal inputs for conditions "01" and "10".
Input
Operation
Time Description
T1 Minimum width of input
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.
T3 Maximum width of input. Longer inputs may cause a
subsequent zero/cal operation some time after the
current one is complete.
T1
T2
T3
T4
Table 2- 3
Value
300 ms
Max: 50 ms (typical)
Min: 0 ms
4 s
E4418B Power Meter User's Guide
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