User`s guide

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