Agilent Technologies E4418B - Zeroing and Calibrating Using TTL Inputs; Figure 2-3 Rmt I;O Port TTL Inputs; Table 2-2 TTL Inputs Control Logic

Power Meter Operation 2
E4418B Power Meter User’s Guide 35
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
Pin Number Connection
1none
2Ground
3 Upper Window TTL Output
4 Lower Window TTL Output
5 TTL Input 1
6 TTL Input 2
7Ground
8Ground
1 2 3 4 5 6 7 8
Tab l e 2 - 2 TTL Inputs Control Logic
Input 1 Input 2 Operation
1 1 None
1 0 CAL
0 1 ZERO
0 0 CAL