HP Saw HP E4419B User's Manual | Page 53

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HP4402.book : chapter2.fm    13  Fri Feb 12 15:32:45 1999

Power Meter Operation

Zeroing and Calibrating the Power Meter

HP E4419B User’s Guide

2-13

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

1

1

None

1

0

CAL A

0

1

ZERO BOTH

0

0

CAL B

Pin Number

Connection

1

none

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

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