HP Saw E4419B manual Zeroing and Calibrating Using TTL Inputs, TTL Inputs Control Logic Operation

Power Meter Operation

Zeroing and Calibrating the Power Meter

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

1 2 3 4 5 6 7 8

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

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

HP E4419B User’s Guide 2-13