HP E4419B User Manual page 55

Table 2-4: TTL Inputs Timing Diagram 2
Timing of zero/cal inputs for condition "00".
Inputs
Operation
T5
Time
T5 Maximum time between inputs going low.
T6 Minimum overlap of low inputs.
T7 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.
T8 Time for cal operation to complete.
All timings based on 100 ms firmware polling.
If both TTL inputs are simultaneously low under any circumstances other than those
shown above, the operation is undefined.
HP E4419B User's Guide
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Zeroing and Calibrating the Power Meter
T6
T7
T8
Description
Power Meter Operation
Value
100 ms
200 ms
4 s
Cal: 6 s (8480 series)
7 s (E series)
2-15