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Power Meter Operation

Zeroing and Calibrating the Power Meter

2-12 Agilent E4418B User’s Guide

Zeroing and Calibrating Using TTL Inputs

You can use the TTL inputs on the rear panel Rmt I/O port to initiate zero

and calibration cycles on the power meter. The connector is an RJ-45

series shielded modular jack with the TTL input pins connected as shown

in Figure 2-3.

Figure 2-3: Rmt I/O Port TTL Inputs

The TTL inputs are active low and control the zero and calibration

functions as shown in Table 2-2

Table 2-2: TTL Inputs Control Logic

Input 1 Input 2 Operation

11None

1 0 CAL

0 1 ZERO

0 0 CAL

Pin Number Connection

1none

2 Ground

3 Upper Window TTL Output

4 Lower Window TTL Output

5 TTL Input 1

6 TTL Input 2

7 Ground

8 Ground

1 2 3 4 5 6 7 8

HP4402.book Page 12 Wednesday, November 29, 2000 4:46 PM

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Agilent Technologies 8487D Guia do Utilizador Página 52