Agilent Technologies 8487D Guía de usuario descargar pdf (Pagina 53)

Power Meter Operation

Zeroing and Calibrating the Power Meter

Agilent E4418B User’s Guide 2-13

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: 10 s (8480 series)

12 s (E series)

Cal: 6 s (8480 series)

7 s (E series)

All timings based on 100 ms firmware polling.

Input

Operation

HP4402.book Page 13 Wednesday, November 29, 2000 4:46 PM

1 2 ... 48 49 50 51 52 53 54 55 56 57 58 ... 195 196

Sin comentarios

Agilent Technologies 8487D Guía de usuario Pagina 53